Confined Space Program Requirements: 1910.146 and Subpart AA

The worker was not welding inside the tank. He was not cleaning it. He was inspecting a tanker trailer, one of the most routine tasks in fleet maintenance, when he asphyxiated at FleetPride Inc.’s Corpus Christi, Texas facility on January 7, 2026. On July 15, OSHA issued the citations: 16 serious and 3 other-than-serious violations carrying $264,380 in proposed penalties, headlined by a failure to implement a confined space program (OSHA News Release 26-875-DAL, July 15, 2026). FleetPride had 15 business days to comply, request an informal conference, or contest the citations before the OSH Review Commission, the penalty is proposed, not final.

For every fleet maintenance shop, tank trailer repair facility, wash rack, and bulk carrier with an in-house garage, the case answers a question most operations have never formally asked: what does OSHA actually require before an employee opens a manway and puts any part of their body inside a tanker barrel? The governing standard is 29 CFR 1910.146, the permit-required confined space rule for general industry, and the FleetPride case is not novel law, it is the standard applied to a workplace category that persistently under-programs for it. Minnesota OSHA made the same point two years earlier, assessing $621,600 against Wayne Transports, Inc. after a March 2024 worker fatality inside a tanker, 10 serious violations of 1910.146 spanning essentially every program element (Minnesota DLI news release). Wayne Transports has contested those citations. Between 2011 and 2018, exactly 1,030 U.S. workers died in confined space incidents, with trench collapse (168), falls to a lower level (156), inhalation of a harmful substance (126) and engulfment (98) as the leading events (BLS CFOI fact sheet, July 2020).

What the FleetPride citation list does not tell a fleet operator is what the program it was missing actually has to contain. That is the gap this post closes. Two standards govern confined space entry, and the first compliance decision an employer makes is which one applies: 29 CFR 1910.146 for general industry, and 29 CFR 1926 Subpart AA for construction. They are not the same rule with different numbers. Every heading below is a question, with its answer and its citation in the first sentences.

What makes a space a confined space under OSHA rules?

Three elements, all of them required, at 29 CFR 1910.146(b): the space is large enough and so configured that an employee can bodily enter and perform assigned work, it has limited or restricted means for entry or exit, and it is not designed for continuous employee occupancy. The rule’s own examples are tanks, vessels, silos, storage bins, hoppers, vaults and pits.

All three have to be true at once, which is why the test gets failed in both directions. A pump room with a normal door is enterable and not built for continuous occupancy, but nothing restricts egress. A duct run too small to get into is restricted but not enterable. The spaces that catch people pass all three quietly: a dust collector hopper, a mixer, a sump, a below-grade valve vault, a grain bin, a rail car, a cargo tank barrel.

The construction standard runs a parallel test at 29 CFR 1926.1202 with one element written differently and one element defined where 1910.146 leaves it open. Element one is only that an employee “can bodily enter it.” Element two carries its own definition: limited or restricted means for entry or exit means “a condition that has a potential to impede an employee’s movement into or out of a confined space,” and the standard names trip hazards, poor illumination, slippery floors, inclining surfaces and ladders. There is no such definition anywhere in 1910.146. The note to 1926.1201(a) then lists more than thirty example locations, including HVAC ducts, storm drains, water mains, concrete pier columns, enclosed beams, drilled shafts, transformer vaults, turbines, chillers and bag houses.

What is the difference between a confined space and a permit-required confined space?

A confined space becomes permit-required under 29 CFR 1910.146(b) if it has any one of four characteristics: it contains or has the potential to contain a hazardous atmosphere, it contains a material with the potential for engulfing an entrant, it has an internal configuration that could trap or asphyxiate an entrant through inwardly converging walls or a floor sloping downward to a smaller cross-section, or it contains any other recognized serious safety or health hazard.

Any one of the four is enough, and the phrase that does the most work in practice is “potential to contain,” because it is what pulls nominally empty vessels into the permit category. A barrel with no product in it still has that potential if it previously held a volatile product, if it was blanketed with nitrogen, or if oxidation has been consuming oxygen inside a sealed shell. The same four-part test appears at 1926.1202.

The thresholds inside “hazardous atmosphere” are numeric and identical in both standards: a flammable gas, vapor or mist in excess of 10 percent of its lower flammable limit; an airborne combustible dust at or above its LFL, approximated in the rule’s own note as a concentration obscuring vision at 5 feet or less; oxygen below 19.5 percent or above 23.5 percent; any substance over its permissible exposure limit; or any other atmospheric condition immediately dangerous to life or health. The counterpart, the non-permit confined space, is one that “does not contain or, with respect to atmospheric hazards, have the potential to contain any hazard capable of causing death or serious physical harm.” That is a high bar, and it is the bar a reclassification has to clear.

Is a tanker trailer a confined space under OSHA rules?

Yes. A cargo tank barrel is large enough to enter, has limited manway openings, and is not designed for continuous occupancy, the three-part confined space definition at 29 CFR 1910.146(b). Residual vapors or oxygen displacement usually make it permit-required, as OSHA’s July 2026 FleetPride citations ($264,380 proposed) illustrate (Release 26-875-DAL).

Apply the three-part test to what actually rolls through a fleet shop and the conclusion is hard to avoid. A tanker barrel, a frac tank, a vacuum truck tank, each is bodily enterable, each restricts entry and exit to one or two manways, and none is built for someone to work inside continuously. That makes each one a confined space before anyone asks what it last hauled. The second question, permit-required or not, turns on the hazards: residual product vapors, inerting gases, or plain oxygen displacement in a vessel that has been sealed. Ownership is irrelevant. A customer’s trailer sitting in your bay for inspection is your confined space problem the moment your employee is the one entering it.

What must a written permit-required confined space program include?

Fourteen elements at 29 CFR 1910.146(d)(1) through (d)(14), triggered by 1910.146(c)(4) the moment the employer decides employees will enter: unauthorized entry prevention, hazard evaluation, safe entry procedures, equipment at no cost, condition testing, an attendant, role designation and training, rescue, a permit system, multi-employer coordination, entry conclusion, and two separate review duties. The program has to be written and available for inspection by employees and their representatives.

Read the scope sentence first, because it decides whether the rest of this section is even your standard. 1910.146(a) states that the section “does not apply to agriculture, to construction, or to shipyard employment (parts 1928, 1926, and 1915 of this chapter, respectively).” That is the most commonly skipped line in the rule and the gate on everything downstream: a construction crew entering a vault on your site is not working under 1910.146 at all, and a program written to the wrong standard is missing obligations rather than exceeding them.

The structural logic sits in paragraph (c) and runs in a fixed order. (c)(1) imposes an unconditional duty on every general industry employer: “The employer shall evaluate the workplace to determine if any spaces are permit-required confined spaces.” That duty does not depend on whether anyone intends to enter anything. (c)(2) requires danger signs or equally effective notice, (c)(3) is the no-entry branch, (c)(4) is the written-program trigger, (c)(5) and (c)(7) are the two documented off-ramps, (c)(6) requires reevaluation when a non-permit space changes use or configuration, and (c)(8) and (c)(9) assign the reciprocal host and contractor information duties. Appendix A is the non-mandatory decision flow chart.

The Wayne Transports citation list, unauthorized-entry prevention, hazard evaluation, pre-entry testing, attendants, permits, training, certification, rescue evaluation, and retrieval systems, reads as a de facto checklist of the standard, which is exactly how a fleet maintenance manager should use it. Those citations are contested, but the program elements they map to are not in dispute; they are the text of the rule. Note what a program is not: a binder with a policy statement in it. Each element is an operational practice that has to function on the day of entry, a calibrated meter someone actually uses, an attendant who actually stands post, a permit someone actually signs and cancels.

What are the 14 elements of a permit-required confined space program?

29 CFR 1910.146(d) enumerates fourteen elements, and the useful way to read them is as the fourteen places a program fails under examination. (d)(1) prevents unauthorized entry. (d)(2) identifies and evaluates the hazards before entry is authorized. (d)(3) sets the means, procedures and practices for safe entry. The construction counterpart is 1926.1204(a) through (n).

Element by element, with the failure mode each one is written against:

(d)(1) Prevent unauthorized entry. Locks, blinds, manway covers. The failure mode is an open manway with a posted sign treated as a control.
(d)(2) Identify and evaluate the hazards before entry. The failure mode is evaluating the space as it is supposed to be rather than as it sits, skipping what it last held.
(d)(3) Means, procedures and practices for safe entry. Six separately citable sub-duties: (i) specify acceptable entry conditions; (ii) let entrants or their representatives observe monitoring and testing; (iii) isolate the space; (iv) purge, inert, flush or ventilate; (v) provide pedestrian and vehicle barriers; (vi) verify conditions stay acceptable throughout the entry.
(d)(4) Equipment, nine categories, at no cost to employees, maintained and used properly. Testing and monitoring, ventilating, communications, PPE, lighting, barriers and shields, ladders and safe ingress and egress equipment, rescue equipment, and anything else needed for safe entry and rescue.
(d)(5) Evaluate conditions before and during entry. (d)(5)(i) requires pre-entry testing and continuous monitoring where isolating the space is infeasible; (d)(5)(iii) fixes the testing order; (d)(5)(v) requires reevaluation when an entrant or a representative asks.
(d)(6) At least one attendant outside the space for the duration of entry operations. Not nearby, not within earshot of the shop.
(d)(7) Procedures for an attendant covering more than one space.
(d)(8) Designate the roles, identify each role’s duties, train each person under (g).
(d)(9) Procedures for summoning rescue, rescuing entrants, providing emergency services, and preventing unauthorized rescue attempts. That last clause exists because would-be rescuers are a documented multiplier in confined space fatality counts.
(d)(10) A system for preparing, issuing, using and cancelling entry permits.
(d)(11) Coordination procedures when more than one employer works in the space.
(d)(12) Procedures for concluding the entry and cancelling the permit.
(d)(13) Review entry operations when there is reason to believe the measures may not protect employees, and revise before any later entry.
(d)(14) Review the program within one year after each entry, using the cancelled permits as the record.

The permit system sits in paragraph (e), and it is the part most programs own on paper and fail in practice. The permit must be prepared documenting completion of the (d)(3) measures before entry is authorized ((e)(1)), signed by the entry supervisor named on it ((e)(2)), posted or otherwise made available to the entrants at the time of entry ((e)(3)), limited to the time required for the task ((e)(4)), terminated and cancelled when the task is done or a condition not allowed by the permit arises in or near the space ((e)(5)), and retained at least one year after cancellation ((e)(6)).

What information has to be on a confined space entry permit?

Fifteen items at 29 CFR 1910.146(f)(1) through (f)(15): the space, the purpose, the date and authorized duration, the authorized entrants, the attendants, the entry supervisor with a signature space, the hazards, the isolation and hazard control measures, the acceptable entry conditions, the results of initial and periodic tests with tester initials and times, the rescue services and how to summon them, the communication procedures, the equipment provided, any other necessary information, and any additional permits such as hot work.

Two of the fifteen are where permits get found incomplete after an incident. (f)(10) wants the actual readings, with the initials of whoever took them and the time of each test, not a checked box labelled “atmosphere OK.” (f)(9) wants the acceptable entry conditions stated in numbers, because a permit without them gives the entry supervisor nothing to verify against under (j)(2). Construction requires sixteen items at 1926.1206(a) through (p); the added field at 1926.1206(e) is the means of detecting a rise in atmospheric hazard levels if the ventilation system stops, and it is the field most often missing from a construction permit copied off a general industry form.

When is confined space training required and when must the program be reviewed?

Four triggers under 29 CFR 1910.146(g)(2): before first assignment of duties, before a change in assigned duties, whenever a change in permit space operations presents a hazard the employee has not been trained on, and whenever the employer has reason to believe there are deviations from the (d)(3) procedures or gaps in an employee’s knowledge of them. Program review runs on a separate clock under (d)(14).

The certification at (g)(4) has three mandatory contents and no more: each employee’s name, the signatures or initials of the trainers, and the dates of training, available for inspection by employees and their representatives. On the review side, (d)(14) requires the review within one year after each entry, performed using the cancelled permits, and the note to that paragraph permits a single annual review covering all entries in a 12-month period. No entry in those 12 months means no review is required. That is the one piece of relief in the paragraph and also the trap: an operation that entered once in February and reviewed nothing has a defect that surfaces when someone asks for the review record. Construction adds three requirements at 1926.1207, training at no cost to the employee, delivery “in both a language and vocabulary that the employee can understand,” and training in the dangers of attempting a rescue for employees not authorized to perform one, with records kept at (d) for the period the employee is employed.

Who can be an attendant, an entrant or an entry supervisor, and what are their duties?

29 CFR 1910.146(h) sets five duties for authorized entrants, (i) sets ten for attendants, and (j) sets six for entry supervisors. Under (i)(4) the attendant remains outside the space until relieved by another attendant, and under (i)(10) performs no duties that might interfere with the primary duty of monitoring and protecting the entrants.

The attendant duties are the ones that collapse first in a short-staffed shop. (i)(3) requires continuously maintaining an accurate count of the authorized entrants, which means a method, not a memory. (i)(7) requires summoning rescue as soon as the attendant determines that entrants may need assistance to escape, not after confirming they do. (i)(9) requires the attendant to perform non-entry rescues as specified by the employer’s rescue procedure. Taken together with (i)(10), an attendant who is also running the parts counter is not an attendant.

The entry supervisor’s duties are verification duties. (j)(2) requires verifying, by checking the entries on the permit, that every specified test was conducted and every specified procedure and piece of equipment is in place, before endorsing the permit. (j)(4) requires verifying that rescue services are available and the means of summoning them are operable. Construction keeps the same three roles at 1926.1208, 1926.1209 and 1926.1210, changes the attendant’s verb from monitoring entrant status to assessing it, requires electronic communication equipment where an attendant assesses entrants in multiple spaces (1926.1204(d)(3)), and raises the entry supervisor bar: 1926.1202 requires that person be a qualified person, defined by a recognized degree, certificate or professional standing, or by extensive knowledge, training and experience with demonstrated ability to solve problems relating to the work.

Do fleet maintenance shops need a written confined space program?

Yes, if employees enter tanker barrels or similar spaces for inspection, repair, or cleaning. OSHA cited FleetPride, a parts distributor, not a chemical plant, for failure to implement a confined space program after a fatal tanker inspection (Release 26-875-DAL, July 15, 2026). The alternative is a documented no-entry policy with enforced manway controls (1910.146(c)(3)).

The trigger is the task, not the industry code. Heavy-duty truck dealerships and service networks, tank trailer repair and testing facilities (including R-stamp shops), tank wash operations, bulk carriers with in-house maintenance, agricultural and fuel co-ops, food-grade tanker operations, any of these has a permit-space program obligation the moment an employee’s head crosses a manway plane. Employers with no written program, no entry permits, and no calibrated gas meter are in the FleetPride posture right now. Shops that staff these tasks with temporary or contract labor carry an additional layer of joint-employer exposure, we broke down how OSHA cites both the staffing agency and the host employer after a confined-space fatality in our analysis of the Converse, Texas staffing-agency citations.

What happened in the FleetPride tanker trailer fatality case?

A worker asphyxiated on January 7, 2026 while inspecting a tanker trailer at FleetPride’s Corpus Christi, TX facility. On July 15, 2026, OSHA proposed $264,380 in penalties for 16 serious and 3 other-than-serious violations, including no confined space program and respiratory protection deficiencies (OSHA Release 26-875-DAL). Penalties are proposed; FleetPride has a 15-business-day contest window.

The timeline matters for anyone benchmarking their own exposure. The inspection opened the day of the fatality and ran to citation in just over six months. The citation package went beyond the confined space program itself, OSHA also cited deficiencies in the respiratory protection program and electrical safety, which is the standard pattern in fatality cases: the investigation starts at the incident and works outward through every program it touches. FleetPride’s three options within the 15-business-day window, comply, request an informal conference with the area director, or contest before the OSH Review Commission, are the same three every cited employer gets. Until that window closes, $264,380 is a proposed figure, and it should be described that way. OSHA did not publish a per-item penalty breakdown for the 19 citations, and this post does not infer one.

Does 1910.146 or 1926 Subpart AA apply to my work?

29 CFR 1910.146(a) states that the general industry standard “does not apply to agriculture, to construction, or to shipyard employment.” Construction work at a worksite with one or more confined spaces falls under 29 CFR 1926 Subpart AA instead, per 1926.1201(a). OSHA stated in the 2015 preamble (80 FR 25366) that the presence of a confined space on the worksite, not the type of work done in it, triggers the duty.

Subpart AA has been in effect since August 3, 2015, published at 80 FR 25366 on May 4, 2015 under RIN 1218-AB47. OSHA built it, in the preamble’s own words, “using the organization, language, and most of the substantive requirements in the general industry confined spaces standard,” then changed what construction work required. Three consequences follow. Where Subpart AA applies and another OSHA standard also addresses a confined space hazard, 1926.1201(c) requires compliance with both, not a choice. For the mixed case, OSHA stated in the preamble that it will “treat compliance with this new rule as compliance with the general industry confined spaces rule when one or more employers are engaged in both general industry work and construction work at the same time in the same space.” And indecision is not a position: the note to the definition of entry employer at 1926.1202 states that an employer “cannot avoid the duties of the standard merely by refusing to decide whether its employees will enter a permit space,” and that OSHA will treat that failure as an implicit decision to allow entry.

Does Subpart AA cover excavations, tunnels and diving?

No. 29 CFR 1926.1201(b) excludes construction work regulated by Subpart P (Excavations), Subpart S (Underground Construction, Caissons, Cofferdams and Compressed Air) and Subpart Y (Diving). Those subparts govern that work instead. Where Subpart AA does apply and another standard also addresses a confined space hazard, 1926.1201(c) requires compliance with both.

The useful read for a facility owner is that a trench is not a Subpart AA problem and a manhole usually is. The dividing line is which subpart regulates the work, not how deep the hole is, and these three carve-outs have no analogue in 1910.146.

What actually differs between 1910.146 and 1926 Subpart AA?

Five differences change what a program has to do, not just which number it cites: the competent person who must identify the spaces before work begins at 1926.1203(a), continuous atmospheric monitoring as the default at 1926.1204(e)(2), the early-warning system for non-isolated engulfment hazards at 1926.1204(e)(1)(iii), the three-party information chain at 1926.1203(h), and a broader confined space definition at 1926.1202. Everything else is renumbered or identical.

Obligation	1910.146 (general industry)	1926 Subpart AA (construction)	What changes
Who identifies the spaces	(c)(1): the employer evaluates the workplace	1926.1203(a): a competent person identifies all confined spaces and each permit space before work begins, “including testing as necessary”	Substantive. Competent person at 1926.1202 requires hazard-recognition ability plus “the authorization to take prompt corrective measures”
Confined space definition	(b): bodily enter and perform assigned work; “limited or restricted means for entry or exit” undefined	1926.1202: bodily enter it; egress element defined as “a condition that has a potential to impede an employee’s movement,” including trip hazards, poor illumination, slippery floors, inclining surfaces and ladders	Substantive. OSHA called the dropped phrase “superfluous” in the preamble, then added an egress definition with no 1910.146 counterpart. The construction text is broader on its face
Monitoring during entry	(d)(5)(ii): test or monitor as necessary; continuous only under (d)(5)(i) where isolation is infeasible	1926.1204(e)(2): continuously monitor unless the employer demonstrates equipment is not commercially available or periodic monitoring suffices	Substantive. The default flips and the burden sits with the employer
Engulfment early warning	No counterpart	1926.1204(e)(1)(iii): where isolation is infeasible, an early-warning system continuously monitoring non-isolated engulfment hazards, alerting entrants and attendants in time to exit	Substantive. Entirely new obligation
Ventilation failure	No counterpart	1926.1204(c)(5): determine that monitoring will detect a rise in hazard levels in time to exit if ventilation stops; 1926.1206(e) puts the detection means on the permit	Substantive. New determination, new mandatory permit field
Information exchange	(c)(8) host to contractor, five duties; (c)(9) contractor to host, three duties	1926.1203(h): three-party chain, host to controlling contractor to each entry employer, debriefings flowing back; 1926.1203(i) fills the role with no controlling contractor present	Substantive. A new party carries a hub duty general industry does not create
Notice of permit spaces	(c)(2): signs or equally effective means	1926.1203(b)(1) same, plus (b)(2): inform authorized representatives and the controlling contractor “in a manner other than posting”	Substantive. Posting alone does not discharge the duty
Entry supervisor	(b): “the person (such as the employer, foreman, or crew chief)“	1926.1202: “the qualified person”	Substantive. Degree, certificate, professional standing, or extensive demonstrated experience
Hazardous atmosphere entry	Prohibited condition, no PPE exception	1926.1202: prohibited “unless the employer can demonstrate that personal protective equipment (PPE) will provide effective protection,” reinforced at 1926.1204(c)(7)	Substantive. A conditional pathway general industry does not provide
Permit suspension	(e)(5): terminate and cancel	1926.1205(e)(2): may suspend where the condition is temporary and does not change configuration or create new hazards, with full reassessment before reentry	Substantive
Permit contents	(f)(1) through (f)(15), 15 items	1926.1206(a) through (p), 16 items; the addition is (e)	One added mandatory field; the other 15 renumbered
Rescue	(k)(1) evaluate and select; (k)(3) retrieval unless it increases overall risk	1926.1211(a)(3)(iii): the service must agree to notify the employer immediately if it becomes unavailable, verified by the supervisor at 1926.1210(d); 1926.1211(c) requires designating an entry rescue service whenever non-entry rescue is not selected and bars entanglement-prone retrieval lines at (c)(3)	Substantive
Document production	No counterpart	1926.1213: every retained document available on request to the Secretary of Labor or a designee	Substantive
Oxygen band, 10 percent LFL, dust approximation, 5-foot retrieval trigger, 1-year permit retention, 1-year program review, testing order	1910.146(b), (k)(3)(ii), (e)(6), (d)(14), (d)(5)(iii)	1926.1202, 1926.1211(c)(2), 1926.1205(f), 1926.1204(n), 1926.1204(e)(3)	Renumbered. Numerically identical
Appendices	A through F, non-mandatory: decision flow chart, atmospheric testing, example programs, example permits, sewer entry, rescuer evaluation	None	Substantive. Construction has no in-standard flow chart, example program, example permit or rescuer evaluation criteria

Picking the wrong standard is not a filing-cabinet error. In Secretary of Labor v. Suncor Energy (U.S.A.) Inc., OSHRC Docket No. 13-0900, decided February 1, 2019, OSHA cited Suncor as a controlling employer after an employee fell 25 feet inside Heater H-401 during a refinery turnaround, alleging a violation of 1910.146(d)(4)(iv). The administrative law judge held the general industry standards did not apply to the work and vacated the 1910.146 items, a ruling not challenged on review. The Commission then reversed the alternative construction fall-protection item on reasonable care, relying in part on the 2015 construction rule’s statement that a controlling contractor is not required to enter a confined space to collect information about the hazards inside it. The $7,000 penalty went away entirely. The Secretary lost that case on standard selection, which is the same question an employer answers when it writes the program.

Why construction programs built off 1910.146 forms fail

Subpart AA has no appendices, no example program, no example permit, and no compliance directive. The only confined space compliance directive OSHA has issued is CPL 02-00-100, Application of the Permit-Required Confined Spaces Standard, 29 CFR 1910.146, dated May 5, 1995, twenty years before Subpart AA existed. There is no construction template to copy, so the template people reach for is Appendices C and D of 1910.146.

A construction program built off those forms is missing at least five things: the competent person designation at 1926.1203(a), the qualified person requirement for the entry supervisor at 1926.1202, the continuous-monitoring default at 1926.1204(e)(2), the early-warning system at 1926.1204(e)(1)(iii), and the ventilation-failure determination at 1926.1204(c)(5) with its permit field at 1926.1206(e). The permit is the tell. If the form has fifteen fields and no line for how a rising atmospheric hazard gets detected when the blower quits, it is a 1910.146 permit being used on a Subpart AA job.

Who has to tell whom: confined space information exchange on a construction site

29 CFR 1926.1203(h) builds a three-party chain general industry does not have. The host employer gives the controlling contractor the known permit space locations, the hazards or the reason each space is a permit space, and any precautions the host implemented. The controlling contractor passes that down, with its own information, to every entity entering and to any other entity whose work could foreseeably create a hazard in the space. Each entry employer then reports back which program it will follow.

The rest is procedural plumbing, and it is the part construction programs leave blank. (h)(3) puts the obtain-and-report duty on the entry employer. (h)(4) assigns coordination when more than one entity will work in or near the space. (h)(5) runs the debriefing back up: the entry employer tells the controlling contractor what hazards were confronted or created, and the controlling contractor passes that to the host and to the other entry employers. 1926.1203(i) covers the site with no controlling contractor: the host, or the employer that arranged the work, fills that role. Two limits keep this honest. The note to (h) states that neither the host nor the controlling contractor must enter a confined space to collect the information it has to pass along, the same statement the Commission relied on in Suncor. And 1926.1203(b)(2) means the duty is not satisfied by posting: the controlling contractor and the employees’ authorized representatives have to be told in a manner other than a sign on the hatch. Who gets cited when the chain breaks is a separate question, and we covered the host and staffing agency side of it in our analysis of the Converse, Texas staffing-agency citations.

What atmospheric testing is required before entering a tanker?

Test with a calibrated direct-reading instrument before entry, in this order: oxygen, then combustible gases and vapors, then toxic gases and vapors (29 CFR 1910.146(d)(5)(iii)), with the same sequence required for ventilation-only entries at (c)(5)(ii)(C). Acceptable oxygen is 19.5 to 23.5 percent, a band defined at 1910.146(b). Conditions must be re-tested or continuously monitored during entry, and any entrant may request re-verification under (d)(5)(v).

The sequence is not stylistic, oxygen comes first because combustible-gas sensors read unreliably in oxygen-deficient air, so a flammables reading taken before an oxygen reading can be false comfort. The standard says so itself in Appendix B(5): “A test for oxygen is performed first because most combustible gas meters are oxygen dependent and will not provide reliable readings in an oxygen deficient atmosphere.” The instrument has to be calibrated to the manufacturer’s schedule, and the results belong on the entry permit under (f)(10), with the tester’s initials and the time, where the entry supervisor verifies them under (j)(2) before authorizing entry. Testing once at the manway and calling it done also fails the standard for a tanker: atmospheres stratify, and a barrel that reads acceptable at the opening can be oxygen-deficient at the far head. Appendix B(4) gives the non-mandatory practice for a stratified atmosphere, testing approximately 4 feet in the direction of travel and to each side. The entrant’s right to observe testing and request re-verification is written into the rule at (d)(3)(ii) and (d)(5)(v), a shop culture where asking for a re-test is treated as slowing the job down is a shop culture the standard was written against.

What oxygen level makes a tank atmosphere dangerous?

Below 19.5% oxygen is oxygen-deficient; above 23.5% is oxygen-enriched and a fire and explosion hazard (29 CFR 1910.146(b)). Asphyxiation in nominally “empty” tankers, the FleetPride fatality mode, typically involves oxygen displacement with no warning odor (Release 26-875-DAL).

“Empty” is the most dangerous word in tanker maintenance. A barrel that hauled nothing hazardous can still have been purged or blanketed with an inert gas, and a sealed vessel can go oxygen-deficient through oxidation alone. Displaced-oxygen atmospheres give the body nothing to detect, no smell, no visible haze, no irritation, which is why the standard requires a meter rather than judgment. The 19.5-23.5% band is the definition of acceptable entry conditions, not a target; a reading outside it means the space stays sealed until ventilation or purging brings it back and the meter proves it. BLS counted 39 oxygen-depletion deaths, 38 hydrogen sulfide deaths and 23 carbon monoxide deaths in confined spaces across 2011 through 2018 (BLS CFOI fact sheet).

Can an employee look inside or inspect a tanker without a full permit entry?

Breaking the plane of the manway with any body part is entry under 1910.146(b). Inspection-only tasks qualify for alternate procedures (1910.146(c)(5), ventilation-only) or reclassification ((c)(7)) only with documented monitoring data proving hazards are controlled or eliminated, a certification, not a judgment call.

This is the exact gap the FleetPride case exposes: “just inspecting” is not an exemption category anywhere in the standard. Leaning in for a look with a flashlight is an entry. The rule does offer two legitimate reduced-burden paths for low-hazard work, entry under forced-air ventilation alone under (c)(5), and reclassification to non-permit status under (c)(7), but both require documented atmospheric data and a written certification before they apply, and (c)(5) still requires testing and continuous ventilation during the work. The ventilation path also has real engineering math behind it, blower sizing, duct derating, purge times, which we cover in our breakdown of confined space ventilation CFM and purge calculations under 1910.146. Shops that treat (c)(5) as a paperwork shortcut rather than a calculated procedure are running permit entries without permits.

When can an employer enter a permit space without a full permit?

Two paths only. 29 CFR 1910.146(c)(5) alternate procedures require all six listed conditions, pre-entry testing in the oxygen then combustibles then toxics order at (c)(5)(ii)(C), continuous forced air ventilation, and a signed written certification under (c)(5)(ii)(H). 1910.146(c)(7) reclassification requires actual hazard elimination with its own signed certification at (c)(7)(iii).

The six conditions at (c)(5)(i) are a demonstration, not a declaration: the only hazard is an actual or potential hazardous atmosphere; continuous forced air ventilation alone is sufficient; monitoring and inspection data supports both of those demonstrations; any initial entry needed to get that data is performed under the full (d) through (k) requirements; the determinations and data are documented and made available to employees; and the entry follows (c)(5)(ii). The certification has to carry the date, the location and the signature of the person making the determination, and it has to exist before entry.

Reclassification under (c)(7) is the stricter path, and the note to (c)(7)(ii) is where most attempts fail: “Control of atmospheric hazards through forced air ventilation does not constitute elimination of the hazards.” Ventilating a space keeps it a permit space. Eliminating the hazard, draining, cleaning, de-energizing, blanking, physically removing the source, is what allows the reclassification, and (c)(7)(iii) requires the signed certification with date, location and signature. In practice, proving the (c)(5) six conditions is more analytical work than writing the permit would have been, which is why operations that reach for (c)(5) as a shortcut end up running unpermitted permit entries. Construction tightens both paths further at 1926.1203(e) and (g): physical hazards must be eliminated or isolated through engineering controls, entrants must be able to exit safely if the ventilation stops, continuous monitoring is the default, and a competent person makes the reclassification determination.

What rescue requirements apply to tanker entry?

Employers must evaluate prospective rescuers’ capability and availability before entry, not dial 911 after a collapse, and provide retrieval systems enabling non-entry rescue unless infeasible (29 CFR 1910.146(k)). Failure to evaluate local emergency services was among Wayne Transports’ cited violations (MN DLI).

The rescue requirement is where most informal programs collapse under scrutiny. Listing the fire department on the permit is not an evaluation, the standard requires assessing, before entry, whether that service can actually reach and extract an entrant from your specific space in time, with confined-space rescue capability, and whether it is available at the hour your crew enters. For tanker work, non-entry retrieval means a harness on the entrant and a retrieval line to a tripod or davit-and-winch at the manway, rigged before entry, unless the equipment would increase overall risk. In an oxygen-deficient atmosphere the timeline is minutes, and would-be rescuers entering unprotected is a documented multiplier in confined-space fatality counts. OSHA’s Clean Harbors citations named exactly that equipment gap: no tripod, no mechanical winch, no full-body retrieval harness (OSHA news release, July 21, 2025).

What rescue arrangements must be in place before a permit space entry?

29 CFR 1910.146(k)(1) requires five things before entry: evaluate a prospective rescuer’s ability to respond in a timely manner given the hazards, evaluate its proficiency with rescue-related tasks and equipment for that type of space, select a service capable of reaching the victim in an appropriate time frame, inform each service of the hazards it may face, and provide access to the spaces so it can develop plans and practice. Appendix F is the non-mandatory evaluation criteria.

If the rescue team is your own employees, (k)(2) adds four measures: PPE and proficiency training at no cost, training in the assigned rescue duties including the authorized-entrant training under (g) and (h), basic first aid and CPR with at least one currently certified member available, and practice rescues at least once every 12 months from actual or representative permit spaces matched on opening size, configuration and accessibility. The (k)(3) retrieval requirements are specific about rigging: a chest or full body harness with the line attached at the center of the back near shoulder level, above the head, or at another small-profile point, the other end attached to a mechanical device or fixed point outside the space, and a mechanical device available for vertical type spaces more than 5 feet deep. Wristlets are permitted only on a demonstration that a harness is infeasible or presents a greater hazard. Construction carries the same architecture at 1926.1211 and adds three things: the selected service must agree to notify the employer immediately if it becomes unavailable ((a)(3)(iii)), the employer must designate an entry rescue service whenever non-entry rescue is not selected, and unsuitable retrieval equipment, including lines with a reasonable probability of entanglement, is prohibited at (c)(3).

What training do workers need before confined space entry?

Training is required before first assignment, before duty changes, when hazards change, and when performance shows deficiencies, with written certification carrying the employee’s name, trainer’s signature, and date, completed before entry (29 CFR 1910.146(g)). Wayne Transports was cited both for inadequate training and for failure to certify it (MN DLI).

Fleet shops fail this element two ways. The first is the obvious one: no training at all, because tanker entry was never recognized as confined-space work. The second is quieter: a technician trained as an attendant gets pulled to enter, or a service writer gets sent to “take a quick look”, a duty change that retriggers the training requirement before that person crosses a manway. The certification requirement is not paperwork for its own sake; it is the mechanism that forces the employer to know, by name and date, who is qualified for which role. Wayne Transports’ dual citation, for the training and separately for the certification, shows enforcement treats them as distinct obligations.

Does a no-entry policy eliminate confined space obligations for a fleet shop?

No, it narrows them. Employers who decide employees will not enter permit spaces must still identify and inventory the spaces, post danger signs or otherwise inform employees, and take effective measures to prevent entry (29 CFR 1910.146(c)(3)). If a customer’s tanker arrives with an open manway, “we didn’t plan to enter” is not a defense once an employee does.

A genuine no-entry posture is a legitimate and often smart choice for a parts or service operation that can send tank-interior work to a specialized facility. But it has to be built, not declared: a written policy, a space inventory that covers customer equipment passing through the shop, signage, physical manway control, and enforcement when someone shortcuts it. The evaluation duty at (c)(1) applies to every general-industry employer regardless of entry intentions, you cannot decide not to enter spaces you never identified. The no-entry decision fails on the day it is tested: one employee, one open manway, one flashlight, and the employer is retroactively running an unauthorized permit entry with no program behind it.

What are the current OSHA penalties for a confined space violation?

Under 29 CFR 1903.15(d), $16,550 per serious or other-than-serious violation, $165,514 per willful or repeat violation with an $11,823 willful minimum, and $16,550 per day for failure to abate. These are the January 2025 amounts set by 90 FR 1861, carried into 2026 unchanged because the 2026 inflation adjustment was cancelled outright (91 FR 31358, May 27, 2026).

The mechanism is worth knowing, because it is why any content telling you 2026 penalties went up is wrong. BLS did not publish the October 2025 CPI-U during the October to November 2025 appropriations lapse, the statute allows no alternative calculation method, and OMB memorandum M-26-11 of April 17, 2026 told agencies to keep using the 2025 amounts. OSHA’s own memo of May 21, 2026 states that “There are no inflation-based increases to OSHA civil penalties for 2026.” One caution on dates: 1903.15(d) ties the amounts to penalties proposed after January 15, 2025, while OSHA’s penalties page states January 15, 2026. The figures are identical in both, so cite the CFR for the amounts. We walked through the freeze itself in our post on the 2026 penalty schedule freeze.

Real cases stack violations, and classification moves the number far more than count does. Two federal cases from the current window make that concrete:

Clean Harbors Environmental Services Inc., Twinsburg, Ohio, at a customer’s facility: $602,938 proposed across three willful violations, after OSHA found the employer failed to implement permit-required space entry requirements, failed to properly ventilate a space containing organic chemical residue, did not test the atmosphere, and did not provide non-entry rescue equipment including a tripod, mechanical winch and full-body retrieval harness (OSHA news release, July 21, 2025).
PCE Petroleum Contractors Enterprises Inc., Lake Worth, Florida: $60,242 proposed across twelve serious violations, following a July 2025 fatality when an employee entered a fuel storage tank and was exposed to benzene and toluene. Cited areas included the written permit space program, atmospheric evaluation and permit requirements, respiratory protection, and hazard communication. The employer has contested before the Review Commission (OSHA news release, March 3, 2026).

Twelve serious items produced one tenth of what three willful items produced. The per-violation figure in 1903.15(d) is a ceiling applied by classification and gravity under 1903.15(b), which directs the Area Director to weigh employer size, gravity, good faith and violation history. Neither release publishes an inspection or citation number, so both cases are identified here by employer, location and release date only.

Inspections are down. That is exactly the wrong reason to relax.

Here is the counter-signal worth reading closely. FleetPride drew zero willful or repeat classifications despite a fatality and a complete program absence, which means $264,380 is closer to the floor of fatality-case exposure than the ceiling: the willful maximum is $165,514 per violation (1903.15(d)), and Clean Harbors shows what three of those look like. At the same time, federal enforcement capacity is contracting on the agency’s own numbers. The DOL FY2027 Congressional Budget Justification reports an FY2025 result of 30,283 federal inspections (25,257 safety, 5,026 health) against a 31,643 target, an FY2026 target of 20,855 (18,769 safety, 2,086 health), and Federal Enforcement FTE going from 1,375 in FY2024 to 1,176 enacted in FY2026 against a 1,072 request for FY2027. Health inspections, which is where atmospheric hazards and permit space documentation actually get examined, are targeted to fall from 5,026 to 2,086. We covered that budget trend in our post on the 2026 OSHA enforcement budget changes. Neither fact helps a fleet shop, because programmed inspection sweeps are not what produces these cases. The fatality itself opens the investigation, with priority attention regardless of the agency’s inspection budget. “OSHA will never come” is a bet about random inspection odds; confined space enforcement does not run on random inspection odds. It runs on the incident, and Minnesota’s $621,600 assessment shows state plans are not settling these cases leniently either (MN DLI).

The regulatory direction of travel is sideways, and that is the argument against waiting

Two more signals cut against the case for programmatic rigor, and both are real. OSHA is carrying a deregulatory item at the construction confined space boundary: RIN 1218-AD23, Welding in Construction Confined Spaces, sits at Proposed Rule Stage in the Fall 2025 Unified Agenda with an Executive Order 14192 designation of Deregulatory and a projected NPRM in September 2026. Its CFR citation is 29 CFR 1926.353, and the abstract says OSHA would remove uncertainty about how “confined space” applies to welding and add language allowing natural ventilation when certain conditions are met. And OSHA’s most recent 1910.146 interpretation narrowed a program element rather than expanding it: the January 3, 2025 letter to Mark A. Lies, II held that flowable utility piping need not be isolated under 1910.146(d)(3)(iii) where it does not terminate in the space and no potential exists for rupture or leakage into it, and that the rupture-probability judgment belongs to the employer.

The practitioner read is the opposite of reassuring. 1910.146 has not been substantively amended since December 27, 2011 (76 FR 80739), Subpart AA not since it took effect in 2015, and not one RIN in the Fall 2025 Unified Agenda lists either as an affected CFR citation. There is no pending rule to wait for. The standard read back to you after an incident is the one sitting unchanged for eleven years, and neither 1910.146 nor 1926.1203 appears in OSHA’s preliminary FY2026 top ten most frequently cited standards, which means these citations are not coming from a programmed sweep. They come from the incident.

Does Kansas, Oklahoma, Missouri, Nebraska, Texas or Colorado have its own confined space standard?

No. None of the six has an OSHA-approved State Plan of any type, so federal OSHA has jurisdiction over private sector workplaces in all six and enforces 29 CFR 1910.146 and 29 CFR 1926 Subpart AA exactly as written (OSHA State Plans). Nationally there are 29 State Plans: 22 covering private sector employers plus state and local government, and 7 covering public employees only.

For a fleet network running terminals across state lines, jurisdiction is a program-design input. In those six states there is no state confined space standard to reconcile and no more-stringent state requirement, so 1910.146 applies as written. Minnesota and Iowa are different: Iowa operates a State Plan covering private sector employers, and Minnesota layers on requirements such as the joint labor-management safety committee that appeared in the Wayne Transports citation list behind that state’s $621,600 assessment. The practical rule for multi-state operations: write one program to the strictest applicable plan and run it everywhere. A separate, lighter program for federal-jurisdiction terminals saves nothing and guarantees the wrong version is in someone’s hands eventually. What varies across iSi’s footprint is not the standard, it is which emphasis program brings a compliance officer through the door. Texas and Oklahoma sit in Region VI, Kansas, Missouri and Nebraska in Region VII, Colorado in Region VIII.

Transportation tanks are a named enforcement target in Texas and Oklahoma

OSHA Region VI operates CPL 2 02-00-032B, the Regional Emphasis Program for Transportation Tank Cleaning Operations, effective August 1, 2024 and expiring July 31, 2028, covering Arkansas, Louisiana, Oklahoma and Texas plus federal-jurisdiction New Mexico. The directive states in its own text that “Transportation tanks meet the definition of a Confined Space as stated in 29 CFR 1910.146” and that such tanks may have one or more characteristics of a permit-required confined space. Its first listed program element is titled “Permit Required Confined Space Program,” directing compliance officers to evaluate the operation for compliance with 1910.146, using CPL 02-00-100 as the interpretive guidance.

That is a programmed inspection route into 1910.146 aimed at exactly the equipment this post is about, and almost no fleet operator has read it. Two honest limits. The directive targets specific NAICS codes (213112, 484110, 488210, 488490, 488510, 562910, 562920, 562998), so whether it reaches a given shop depends on that shop’s code, and there is no basis here for connecting this emphasis program to the FleetPride inspection. Region VII’s grain handling program, KCM-CPL-04-00-001, effective October 1, 2024 through September 30, 2029 in Kansas, Nebraska and Missouri, lists confined spaces among the hazards it may address but cites 1910.272, not 1910.146. For Colorado, no Region VIII emphasis program touching confined space entry was located, which is a limit on the search, not a finding that none exists.

Where a fleet maintenance shop should start, this week

The FleetPride and Wayne Transports citation lists, read together, are a self-audit. Five steps, in order:

Inventory every space, tanker barrels, frac tanks, vacuum truck tanks, pits, wash bays’ vessels, and customer equipment that moves through the shop (1910.146(c)(1)).
Make the entry decision explicitly, permit-space program, or documented no-entry policy with manway controls (c)(3). Not deciding is deciding to have neither.
Write the program to the standard’s elements, hazard evaluation, testing, permits, attendants, training, rescue (c)-(k), against the strictest state plan in your footprint.
Put a calibrated four-gas meter and trained people behind it, testing in the required order, results on the permit, before every entry.
Solve rescue before the first permit is issued, evaluated rescuers, retrieval equipment at the manway, non-entry rescue as the default.

Add a sixth step if any of the work in or around those spaces is construction work: decide which standard governs before you write the program, because 1910.146(a) says it is not yours if the work is construction, and Suncor is what the wrong answer costs. The arithmetic on the other side is in the schedule, not in an estimate. One willful violation runs to $165,514 and a serious violation to $16,550 under 1903.15(d), three willful items ran to $602,938 at Clean Harbors, and once a citation issues the employer has 15 working days from receipt of the notice of proposed penalty to contest it in writing under 1903.15(a). Abatement does not wait for the program you have not written yet.

iSi’s safety consulting team builds confined space programs for fleet maintenance and tanker operations that hold up on the day of entry, space inventories, written programs, permit systems, atmospheric testing procedures, training, and rescue evaluations, across 40 states, written once to the strictest applicable plan and to the right standard for the work. If tankers move through your shop and your program is a binder nobody has opened, start with our safety consulting team or call (316) 264-7050 for a same-day response.

Frequently Asked Questions

What makes a confined space permit-required under OSHA rules?

Any one of four characteristics at 29 CFR 1910.146(b): an actual or potential hazardous atmosphere, an engulfment hazard, an internal configuration that could trap or asphyxiate an entrant, or any other recognized serious safety or health hazard.

Is a tanker trailer a permit-required confined space?

Usually. A cargo tank barrel meets the three-part confined space definition, and residual vapors, inerting gases, or plain oxygen displacement typically make it permit-required. OSHA’s July 2026 FleetPride citations, $264,380 proposed after a fatal tanker inspection, applied exactly that analysis.

What atmospheric testing is required before a confined space entry?

Testing with a calibrated direct-reading instrument, in this order: oxygen first, then combustible gases and vapors, then toxic gases and vapors, per 1910.146(d)(5)(iii). Acceptable oxygen is 19.5 to 23.5 percent.

Which standard applies to construction work, 1910.146 or 1926 Subpart AA?

1910.146(a) excludes construction. Construction work at a worksite with a confined space falls under 29 CFR 1926 Subpart AA, which adds a competent-person identification duty, a continuous-monitoring default, and a three-party information exchange that 1910.146 does not have.

Sources

OSHA News Release 26-875-DAL, US Department of Labor cites big rig parts distributer for confined space, safety hazards after worker fatality at Corpus Christi facility (July 15, 2026) (verified 2026-07-16)
Minnesota DLI, Minnesota OSHA issues citations to Wayne Transports, Inc. after worker died in confined space ($621,600; August 28, 2024) (verified 2026-07-16)
OSHA Confined Spaces topic page (verified 2026-07-16)
29 CFR 1910.146, Permit-required confined spaces, full current text including Appendices A through F (verified 2026-11-04)
29 CFR 1926 Subpart AA, Confined Spaces in Construction, sections 1926.1201 through 1926.1213 (verified 2026-11-04)
29 CFR 1926.1201, Scope and application (verified 2026-11-04)
29 CFR 1926.1202, Definitions (verified 2026-11-04)
29 CFR 1926.1203, General requirements, including the (h) information exchange chain (verified 2026-11-04)
29 CFR 1926.1206, Entry permit, 16 required items (verified 2026-11-04)
29 CFR 1926.1207, Training (verified 2026-11-04)
29 CFR 1926.1208, Duties of authorized entrants (verified 2026-11-04)
29 CFR 1926.1211, Rescue and emergency services (verified 2026-11-04)
29 CFR 1903.15, Proposed penalties, with the adjusted amounts at (d) and the 15-working-day contest window at (a) (verified 2026-11-04)
Federal Register final rule, Confined Spaces in Construction, 80 FR 25366, May 4, 2015, RIN 1218-AB47, effective August 3, 2015 (verified 2026-11-04)
Federal Register, Department of Labor Federal Civil Penalties Inflation Adjustment Act Annual Adjustments for 2026, 91 FR 31358, May 27, 2026 (2026 adjustment cancelled; OMB M-26-11 of April 17, 2026) (verified 2026-11-04)
OSHA Memorandum, 2026 OSHA Civil Penalties Update: No Inflation Adjustment and Updated Minimum Penalties, May 21, 2026 (verified 2026-11-04)
OSHA Penalties page, current maximum penalty amounts (verified 2026-11-04)
OSHA Standard Interpretation, Permit Required Confined Space, January 3, 2025, to Mark A. Lies, II (isolation of flowable utility piping under 1910.146(d)(3)(iii)) (verified 2026-11-04)
OSHA Directive CPL 02-00-100, Application of the Permit-Required Confined Spaces Standard, 29 CFR 1910.146, May 5, 1995 (verified 2026-11-04)
OSHA Directive CPL 2 02-00-032B, Regional Emphasis Program for Transportation Tank Cleaning Operations, Region VI, effective August 1, 2024, expires July 31, 2028 (verified 2026-11-04)
OSHA Directive KCM-CPL-04-00-001, Regional Emphasis Program for Grain Handling Facilities, Region VII, effective October 1, 2024, expires September 30, 2029 (verified 2026-11-04)
OSHA News Release, federal investigators cite waste management company after confined space worker fatality (Clean Harbors Environmental Services Inc., Twinsburg OH, $602,938, three willful), July 21, 2025 (verified 2026-11-04)
OSHA News Release, Florida petroleum tank services contractor cited after worker fatality from toxic chemical exposure (PCE Petroleum Contractors Enterprises Inc., Lake Worth FL, $60,242, twelve serious, contested), March 3, 2026 (verified 2026-11-04)
OSHA Top 10 Most Frequently Cited Standards, FY2026 preliminary, October 1, 2025 to August 31, 2026 (verified 2026-11-04)
OSHA State Plans, 29 approved plans, 22 private plus public and 7 public only (verified 2026-11-04)
reginfo.gov, RIN 1218-AD23, Welding in Construction Confined Spaces, Proposed Rule Stage, 29 CFR 1926.353, EO 14192 designation Deregulatory, projected NPRM September 2026 (verified 2026-11-04)
BLS, Fatal occupational injuries involving confined spaces, 2011 to 2018 fact sheet, July 2020 (1,030 total; leading events; oxygen depletion, hydrogen sulfide and carbon monoxide counts) (verified 2026-11-04)
DOL FY2027 Congressional Budget Justification, Occupational Safety and Health Administration (FY2025 result 30,283 inspections; FY2026 target 20,855; Federal Enforcement FTE reductions) (verified 2026-11-04)
OSHRC, Secretary of Labor v. Suncor Energy (U.S.A.) Inc., Docket No. 13-0900, Commission decision February 1, 2019 (verified 2026-11-04)