API 510 Pressure Vessel Inspection Support in Michigan

Short answer: Michigan's state boiler law regulates boilers, not unfired pressure vessels in general, so for most process vessels in the state, API 510 inspection is driven by the owner's mechanical integrity programme under MIOSHA's process safety rule, by insurers and, inside Detroit, by the city's own pressure vessel inspections. The owner's API 510 Authorized Inspector (AI) sets the intervals and signs. Atlantis NDT performs the nondestructive examinations behind that work: UT thickness at CMLs, corrosion mapping, PAUT, TOFD, WFMT, ET, RT, PT and VT. Atlantis performs the NDE; your API 510 Authorized Inspector remains inspector of record and signs the inspection report.

That regulatory gap is the most important thing to understand about vessel inspection in Michigan. In states such as Washington or New Jersey, a state certificate cycle forces periodic inspection of every non-exempt vessel. In Michigan, outside the city of Detroit, the discipline comes from the owner: a PSM-covered refinery or chemical plant must follow RAGAGEP, which for pressure vessels means API 510, but a manufacturing plant with air receivers and process vessels outside PSM may have no external driver except its insurer. Good inspection data matters even more when the programme is self-imposed. To begin, request an NDE scope for your AI's plan.

Where API 510 pressure vessels are in Michigan

Direct answer: Michigan's API 510 vessels cluster in the Detroit and Downriver industrial corridor (the state's only refinery, chemical, steel and auto plants), the Midland, Saginaw and Bay City chemical region, southwest Michigan's pharmaceutical and food plants, and power stations, gas storage fields and paper mills across the Lower and Upper Peninsulas.

Detroit, Dearborn and the Downriver corridor

Marathon Petroleum's Detroit refinery in southwest Detroit is the only operating refinery in Michigan. It runs crude and vacuum units, a coker, catalytic cracking, hydrotreating, reforming, alkylation, sulfur recovery and amine treating, so its vessel population includes coke drums, reactors, fractionator drums, sour water strippers, amine regenerators and the heavy-wall equipment of hydroprocessing. Downriver along the Detroit River, chemical plants at Wyandotte and Riverview, integrated steelmaking at Dearborn, and power stations add reactors, receivers, gas-cleaning vessels, air separation equipment and deaerators. Damage mechanisms run from sulfidation and wet H2S cracking at the refinery to caustic cracking in chlor-alkali and chemical service and condensate corrosion in steel-mill gas systems. See refining NDT consulting in Detroit and steel NDT consulting in Detroit.

Midland, Saginaw and Bay City: the chemical region

Dow's Midland operations, one of the largest chemical complexes in the country, anchor the region, with Hemlock Semiconductor's polysilicon plant in Saginaw County and other chemical, materials and cogeneration plants nearby. Vessels in this region include chlorinated-hydrocarbon and silicone reactors, distillation columns, chlorosilane and HCl service equipment, caustic and brine vessels, and large cogeneration steam systems. Chloride and acid corrosion, caustic cracking and corrosion of alloy and lined equipment call for alloy-aware NDE and careful damage mechanism selection.

Southwest Michigan: pharmaceuticals, food and nuclear

Pharmaceutical manufacturing in the Kalamazoo area and Allegan County, cereal and food production around Battle Creek, and food and beverage plants across the region run stainless reactors, jacketed vessels, autoclaves, sterilisers, clean-steam generators and ammonia refrigeration receivers. Chloride stress corrosion cracking of stainless steel, pitting and jacket corrosion are typical findings. The Cook nuclear plant at Bridgman and the Palisades site near South Haven have nuclear inspection programmes under ASME Section XI, but balance-of-plant and support vessels follow non-nuclear practice.

Power and natural gas storage

Michigan has some of the largest underground natural gas storage capacity in the United States, and its storage fields run separators, dehydration contactors, glycol regenerators and compressor drums that see cyclic injection and withdrawal. Coal and gas-fired generating stations across the Lower Peninsula, the Fermi 2 nuclear plant in Monroe County, and combined-cycle and cogeneration plants such as Midland's add feedwater heaters, deaerators, blowdown tanks and air receivers.

Auto manufacturing, paper and the Upper Peninsula

Assembly, stamping, powertrain and battery plants across southeast and west Michigan run compressed-air receivers, paint-shop and process vessels and, increasingly, battery-material process equipment. Paper mills in the Upper Peninsula and the Lower Peninsula run digesters, accumulators and steam-heated dryer cans. Mining and mineral processing in the Upper Peninsula add process vessels at remote sites where winter access and lake-effect snow shape the schedule.

What API 510 requires, in plain terms

Direct answer: API 510 governs in-service inspection, repair, alteration and rerating of pressure vessels and their relief devices. Each vessel needs an inspection plan; external and internal or on-stream inspections are scheduled from measured corrosion rate and remaining life; and the AI accepts results and authorises repairs. In Michigan, the code's force for most process vessels comes from MIOSHA PSM and the owner's own programme.

API 510 is published by the American Petroleum Institute, and the current edition is the 11th (October 2022). Older editions circulate widely online, so confirm requirements against the edition your programme uses. In paraphrase, external inspection is due at no more than the lesser of five years or the internal or on-stream interval, and internal or on-stream inspection at no more than the lesser of half the remaining life or ten years; where remaining life is under four years, the interval may be the full remaining life up to two years. An RBI programme meeting the code's conditions may set intervals instead, and that assessment is performed by the owner's engineers or a specialist, never by Atlantis.

The working document is the inspection plan. For each vessel it records the credible damage mechanisms (API 571 is the reference), inspection type and coverage, condition monitoring locations (CMLs), NDE techniques and next due dates. On-stream inspection may replace internal inspection when the code's conditions are met, which in practice depends on whether external NDE can detect and size the expected damage. Corrosion rates come from thickness trends at the CMLs; remaining life is the margin between measured and required thickness divided by the governing rate.

Because Michigan does not impose a state certificate cycle on most vessels, a plant outside PSM sometimes asks whether it needs API 510 at all. Legally that depends on what applies to the site, and the owner should take its own advice; practically, API 510 offers a defensible structure for intervals, repairs and records that insurers and auditors recognise. Pressure-relief devices are part of the same programme, with API RP 576 as the reference practice. For the arithmetic see API 510 interval calculation explained; for how the API 510 inspector differs from a National Board commissioned inspector, API 510 vs NBIC commissioned inspector.

NDE methods for API 510 work in Michigan

Direct answer: UT thickness and corrosion mapping give the trend data; PAUT, TOFD and WFMT address cracking in sour, amine, caustic and coker services; ET covers exchanger and condenser tubes; RT, PT and VT cover welds, alloy and stainless equipment and overall condition. In chemical service, alloy and lined vessels often need techniques chosen for the material.

For each examination we document coverage, grid density, the damage mechanism targeted and any areas not examined, which matters in Michigan because the owner's records are often the only regulatory evidence that a vessel was inspected. Insulated vessels exposed to freeze-thaw cycles and lake-effect weather are prime CUI candidates; see CUI inspection support and our API 571 damage mechanisms guide.

Michigan is not an NRC Agreement State, so the U.S. Nuclear Regulatory Commission licenses radioactive materials used in industrial radiography there, while the state regulates radiation-producing machines. RT on Michigan sites is performed by crews licensed for that work; confirm current licensing authority before planning radiography.

How Atlantis supports your Authorized Inspector

Direct answer: Atlantis converts the AI's inspection plan into Level III-reviewed procedures, performs the examinations with ASNT-certified technicians and delivers a digital report the AI evaluates and signs. We are not an Authorized Inspection Agency and we do not supply API-certified inspectors. Where no state certificate applies, that report becomes the core evidence of the owner's programme.

In Michigan the inspector of record for a process vessel is usually the owner's API 510 inspector, an insurer's inspector for underwriting purposes, or, for vessels in Detroit, a city inspector. Atlantis works underneath as the NDE contractor:

1. Plan intake. Vessel list, National Board numbers, CML map, damage mechanisms, inspection type and due dates from the AI's plan, plus any city or insurer inspection dates.
2. Procedures. UT, mapping, PAUT, TOFD, WFMT, ET and RT techniques prepared or reviewed by an ASNT NDT Level III, with coverage plans where on-stream inspection is proposed in place of entry.
3. Field execution. Crews mobilised to your site; the schedule is agreed during scoping around unit status, permits, confined-space entry and production.
4. Data QA. Readings checked against history; anomalies re-shot while access exists.
5. Digital report. CML IDs, readings, C-scans, indication tables, photographs, calibration and equipment records and technician certifications in Atlantis's reporting platform.
6. Evaluation and sign-off. The AI determines corrosion rates, remaining life, intervals and repairs; figures can be calculated from our data for the AI's review. Atlantis performs the NDE; your API 510 Authorized Inspector remains inspector of record and signs the inspection report.
7. Next cycle. CML numbering carries forward unchanged for like-for-like trending.

If the owner's engineers run RBI or a fitness-for-service assessment, our maps and flaw sizes feed that work, done by them or a specialist. More: API 510 pressure vessel NDE support and pressure vessel inspection services.

Michigan regulations that sit on top of API 510

Direct answer: LARA's Boiler Division administers the boiler provisions of the Skilled Trades Act, which cover boilers rather than unfired pressure vessels generally. MIOSHA enforces process safety through Part 91, which adopts 29 CFR 1910.119 by reference. The City of Detroit runs its own boiler and pressure vessel inspections. Confirm current requirements with each body.

State boiler law. Michigan's Boiler Division sits in the Bureau of Construction Codes of the Department of Licensing and Regulatory Affairs (LARA), with a Board of Boiler Rules, under the Skilled Trades Act of 2016. According to the National Board's jurisdictional synopsis (reviewed by the state in 2023), the objects subject to the state's construction and field inspection rules are boilers. Pressure vessel requirements in the synopsis are limited to construction of boiler blowdown tanks, separators and flash tanks to ASME Section VIII and National Board registration of those items. Power and process boilers receive annual certificate inspections; repairs and alterations to high-pressure boilers require a National Board "R" stamp. The state adopts the NBIC for boiler work. In short, there is no state certificate cycle for a refinery drum or a chemical reactor in Michigan; confirm with the Boiler Division if a particular item is in doubt.

City of Detroit. Detroit's Buildings, Safety Engineering and Environmental Department (BSEED) has a boiler and pressure vessel inspection team that issues permits and inspects boilers, pressure vessels and fuel tanks, and its published programme includes biennial inspections of pressure vessels above 15 psi. Owners of vessels within Detroit city limits should confirm with BSEED which of their vessels fall under the city programme and how it interacts with their API 510 schedule.

Process safety: MIOSHA Part 91. Michigan runs its own OSHA state plan, MIOSHA. Its Part 91 adopts the federal PSM standard, 29 CFR 1910.119, by reference. The mechanical integrity element, paragraph (j), requires written procedures, inspection and testing following RAGAGEP, documented inspections and correction of deficiencies. For pressure vessels at the Detroit refinery and covered chemical plants, API 510 is the RAGAGEP owners cite. EPA's RMP (40 CFR Part 68) Program 3 runs in parallel.

Mechanical code and insurers. Michigan's mechanical code addresses installation of regulated pressure vessels through local code officials, and many owners carry boiler and machinery insurance whose inspectors examine pressure vessels for underwriting. Neither replaces an API 510 programme, but both may ask to see the inspection records.

Pipelines at the fence. The Michigan Public Service Commission oversees intrastate gas pipeline safety with PHMSA, and interstate gas and hazardous liquid lines, including the major crude and NGL lines crossing the state, fall to PHMSA under 49 CFR Parts 192 and 195. Separators and pig receivers at gas storage fields and refinery fence lines need a clearly assigned code and inspection owner.

Planning around turnarounds, winter and production

Direct answer: Plan the refinery and chemical turnarounds well ahead because Great Lakes refineries share NDE labour, use on-stream NDE to limit vessel entries, schedule external and CUI work outside the deep-winter months, and align gas storage inspection with the injection and withdrawal cycle.

• Turnarounds: the Detroit refinery competes for crews with refineries in Ohio, Indiana, Illinois and Ontario; scope coke drum PAUT, heavy-wall TOFD and WFMT of amine and sour vessels before the outage starts.
• Chemical plant outages: Midland-region outages are often unit by unit; agree alloy-specific techniques and coverage with the AI in advance.
• On-stream first: where external NDE can see the expected damage, the AI may credit an on-stream inspection; plan coverage before the outage so entries are saved for vessels that need them.
• Gas storage cycle: storage fields inject in summer and withdraw in winter; vessel inspections are usually planned in shoulder seasons.
• Winter and lake effect: cold and snow affect external work, insulation removal and PT temperature limits; plan CUI campaigns for late spring to early autumn and use heated enclosures in winter.
• Auto and pharmaceutical shutdowns: plant shutdown weeks and batch campaigns set short windows; on-stream UT of receivers and well-planned entries keep the work inside them.

API 510 inspection support across Michigan

Direct answer: Atlantis supports API 510 vessel programmes from Detroit and Downriver to the Midland chemical region, southwest Michigan and the Upper Peninsula. Crews are mobilised to your site, and the schedule is agreed during scoping.

• Detroit, Dearborn and Downriver: pressure vessel inspection in Detroit, with corrosion inspection, piping inspection, tank inspection and third-party inspection in Detroit, plus ultrasonic testing in Detroit.
• Midland, Saginaw and Bay City: chemical, silicone, polysilicon and cogeneration vessels.
• Kalamazoo, Battle Creek and southwest Michigan: pharmaceutical, food and power-plant vessels.
• Grand Rapids, Lansing and Flint: manufacturing, auto and utility vessels.
• Gas storage fields and generating stations statewide: separators, dehydration vessels, feedwater heaters and deaerators.
• Upper Peninsula: paper mill, mining and utility vessels.

Sibling hubs for the state: API 653 tank inspection in Michigan and API 570 piping inspection in Michigan. For all NDT methods statewide see NDT inspection services in Michigan; for procedures and written practices, NDT consulting in Michigan; and for in-house technicians, ASNT NDT training in Michigan. A digital twin for Detroit-area assets is available where owners want results in 3D.

Running a defensible vessel programme without a state certificate

Direct answer: Without a state certificate cycle, the owner's API 510 records are the evidence MIOSHA, insurers and auditors will ask for. Atlantis makes those records complete: plan-linked CMLs, technique matched to damage mechanism, coverage maps, calibration and technician records, and a clear list of what was not examined.

Plants that are new to API 510, or that inherited vessels through an acquisition, often start with an incomplete baseline: some vessels have thickness history, others only a nameplate. A practical path is to build the vessel register first, with U-1 data reports, National Board numbers and materials, then have the AI set an initial inspection plan with damage mechanisms per vessel, and then run a baseline NDE campaign that establishes CMLs and first readings. The second campaign produces the first real corrosion rates, and from then on the code's interval logic applies cleanly.

Atlantis supports each step on the NDE side. We can survey nameplates and record existing CML markings during the baseline, propose CML locations for the AI's approval based on geometry and damage mechanism, and deliver baseline data in a structure that will trend correctly next time. Results can be tracked against due dates in our inspection-management ERP, mapped onto a digital twin and delivered in formats shown on NDT report templates. For how API 510 and API 570 divide responsibility at a vessel nozzle, see API 510 vs API 570. Ask us to scope a baseline vessel survey.

What to send us for a Michigan quote

Direct answer: Send the vessel list, the AI's plan and CML map, the latest API 510 report or any previous thickness data, any Detroit or insurer inspection dates, access status and target dates. We quote within 24 hours of receiving that information.

1. Vessel tags, U-1 data reports or nameplate data, National Board numbers, drawings and materials.
2. The last API 510 report and thickness history, or a note that a baseline is needed.
3. The AI's inspection plan, CML map and damage mechanisms of concern.
4. Any City of Detroit permit or inspection dates and insurer inspection requirements.
5. Inspection type, cleaning and entry status, insulation and scaffold requirements.
6. Dates, outage or shutdown window and site safety and orientation requirements.

Send us your vessel list and we will reply with questions or a draft scope.

Frequently asked questions: API 510 in Michigan

Does Michigan require pressure vessel inspections?

Michigan's state boiler law covers boilers, and the National Board synopsis lists no general state field-inspection programme for unfired pressure vessels. PSM-covered plants must still inspect vessels under MIOSHA Part 91, and Detroit has its own programme. Confirm with LARA's Boiler Division for specific items.

Does the City of Detroit inspect pressure vessels?

Yes. Detroit's BSEED boiler and pressure vessel team issues permits and inspects boilers, pressure vessels and fuel tanks, including biennial inspections of vessels above 15 psi. Confirm with BSEED which vessels are covered.

Is API 510 mandatory in Michigan?

Not by a state boiler rule. At PSM-covered facilities, MIOSHA Part 91 requires inspection and testing following RAGAGEP, and for pressure vessels API 510 is the RAGAGEP most owners cite. Elsewhere it is the owner's choice, often encouraged by insurers.

Which OSHA programme applies to Michigan plants?

MIOSHA, Michigan's state plan. Its Part 91 adopts the federal process safety standard, 29 CFR 1910.119, by reference, including mechanical integrity.

How often must a vessel be inspected under API 510?

Under the current edition, external at no more than the lesser of five years or the internal interval; internal or on-stream at no more than the lesser of half the remaining life or ten years, with special rules when remaining life is under four years. RBI can set other intervals.

Is Atlantis an Authorized Inspector?

No. We are not an Authorized Inspection Agency and we do not supply API-certified or commissioned inspectors. We deliver independent NDE data for your AI.

Can you inspect the Detroit-area refinery and chemical vessels on-stream?

Often, yes. Corrosion mapping and PAUT from outside can find localised and weld damage on-stream; whether that substitutes for internal inspection is the AI's decision.

Can you set up a baseline survey for vessels with no history?

Yes. We record nameplates and existing CMLs, propose CML locations for the AI's approval and take first readings so the next survey produces real corrosion rates.

Who licenses industrial radiography in Michigan?

Michigan is not an NRC Agreement State, so the NRC licenses radioactive materials used in radiography there. Confirm current licensing authority before radiography work.

Do you perform RBI or fitness-for-service?

No. We supply the data those assessments use; the owner's engineers or a specialist perform them.

Do you offer API 510 certification training?

No. Atlantis trains to ASNT SNT-TC-1A only. See the API inspector career guide for the certification route and NDT training in Michigan for NDE skills.

How quickly can you mobilise to Detroit or Midland?

We quote within 24 hours once we have the scope; the mobilisation date is agreed during scoping around your outage and permits.

Next step

To line up NDE that supports your AI and gives your Michigan vessel programme defensible records, get a quote within 24 hours or book a scoping call. Atlantis performs the NDE; your API 510 Authorized Inspector remains inspector of record and signs the inspection report.

More Atlantis NDT services in Michigan

• NDT training and certification in Michigan
• Level III consulting in Michigan
• NDT inspection services in Michigan
• API 653 storage tank inspection support in Michigan
• API 570 piping inspection support in Michigan
• NDT ERP software in Michigan
• Practical NDT simulator in Michigan

Part of the full range of pressure vessel inspection services from Atlantis NDT.