API 510 Pressure Vessel Inspection Support in Indiana

Short answer: In Indiana, non-exempt unfired pressure vessels need a state operating permit, normally renewed on a three-year inspection cycle under the Indiana Boiler and Pressure Vessel Rules (675 IAC 30), and corroding vessels are inspected internally following NBIC Part 2 or API 510. At refineries and chemical plants, the owner's API 510 Authorized Inspector (AI) directs the in-service programme. Atlantis NDT performs the nondestructive examinations both rely on: UT thickness at CMLs, corrosion mapping, PAUT, TOFD, WFMT, RT, PT, VT and ET. Atlantis performs the NDE; your API 510 Authorized Inspector remains inspector of record and signs the inspection report.

What sets Indiana apart is that its rules name NDE directly. Instead of an internal inspection, certain unfired pressure vessels may be examined by an alternate method that ensures integrity and safe operation, such as ultrasonic thickness measurement, phased array UT, eddy current, radiography or borescope, when qualified personnel perform it. That makes the quality of the external NDE a permit question, not just an engineering preference. Indiana's industrial base is also unlike its neighbours: the largest refinery in the Midwest at Whiting, integrated steel mills along Lake Michigan, a second refinery in the southwest, and pharmaceutical, chemical, aluminium, power and ag-processing plants in between. To start, request an NDE scope for your AI's plan.

Where API 510 pressure vessels are in Indiana

Direct answer: Indiana's API 510 vessels cluster in the Calumet Region (the Whiting refinery and integrated steel mills at East Chicago, Gary and Burns Harbor), the Mount Vernon and Evansville area on the Ohio River, the pharmaceutical and manufacturing belt around Indianapolis and Lafayette, and the ethanol, soybean and power plants spread across the state.

Whiting, East Chicago and Hammond

BP's Whiting refinery on the Lake Michigan shore is the largest refinery in the Midwest and one of the largest in the country. After its modernisation for heavy Canadian crude it runs large crude units, cokers, hydrotreaters, hydrocrackers, sulfur recovery and hydrogen production, so its vessel population includes heavy-wall reactors, coke drums, amine and sour water systems and high-temperature fractionation equipment. The damage list follows: sulfidation and naphthenic acid corrosion, wet H2S blistering and cracking, amine stress corrosion cracking, ammonium bisulfide corrosion in reactor effluent systems and thermal-fatigue cracking of coke drums. See also NDT consulting in Whiting.

Burns Harbor, Gary and Indiana Harbor steel

Indiana produces more steel than any other state, from integrated mills at Burns Harbor, Gary and Indiana Harbor. Mills are not usually thought of as API 510 territory, but they run substantial pressure equipment: air separation units with cold boxes and receivers, compressed-air and nitrogen receivers, coke by-product recovery vessels, gas cleaning equipment, deaerators and feedwater heaters in the powerhouse, and hydraulic accumulators. Many owners use API 510 principles for inspection planning on this equipment even outside a PSM process, because the code gives a defensible structure for intervals. Damage here tends to be erosion, condensate corrosion, dew-point corrosion in gas service and fatigue from cycling.

Mount Vernon, Evansville and the Ohio River

CountryMark's refinery at Mount Vernon processes Indiana and Illinois Basin crude, and a large engineering-plastics plant operates nearby. Along the river, chemical, pharmaceutical, aluminium and power plants and barge terminals add reactors, strippers, exchangers and receivers. Summer humidity on the Ohio River accelerates corrosion under insulation, and river-valley fog and floods complicate scheduling.

Indianapolis, Lafayette and central Indiana

Pharmaceutical and life-science manufacturing in Indianapolis and near Lafayette, corn wet milling and food processing, engine and vehicle plants, and district energy systems bring stainless reactors, autoclaves, jacketed vessels, clean-steam generators, air receivers and ammonia refrigeration vessels. Chloride stress corrosion cracking of stainless steel and pitting under deposits are typical concerns, and NDE has to fit production campaigns and cleaning validation.

Ethanol, soybean and power

Indiana's ethanol plants, soybean crushers and biodiesel units run distillation columns, molecular-sieve vessels, CO2 scrubbers, hexane extraction equipment and steam systems. Coal and gas generating stations, including Duke Energy Indiana's integrated gasification combined-cycle plant at Edwardsport, add gasification and syngas cleanup vessels alongside the usual feedwater heaters and deaerators.

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 has an inspection plan; external and internal or on-stream inspections are scheduled from corrosion rate and remaining life; the AI authorises repairs and accepts results. Indiana's permit cycle runs in parallel.

API 510 is published by the American Petroleum Institute; the current edition is the 11th (2022). Confirm requirements against the edition your programme uses, because older editions are widely copied online. In paraphrase: external inspection is due at no more than the lesser of five years or the internal or on-stream interval; internal or on-stream inspection is due at no more than the lesser of half the remaining life or ten years; and where remaining life is under four years the interval may be the full remaining life, up to two years. A documented risk-based inspection programme that meets the code's conditions may set intervals instead. Pressure-relief devices are tested and inspected following API RP 576.

The code relies on an inspection plan that names, for each vessel, the credible damage mechanisms (API 571 is the reference), the inspection type and coverage, the condition monitoring locations, the NDE techniques and the next due dates. On-stream inspection can stand in for internal inspection when the code's conditions are met, which in practice depends on whether external NDE can find and size the expected damage. Corrosion rates come from thickness trends, and remaining life is the margin between measured and required thickness divided by the governing rate.

Indiana's rules echo that logic. A vessel subject to internal corrosion is inspected internally according to NBIC Part 2 or API 510, and the alternate-method provision recognises that well-planned external NDE can replace an internal inspection for qualifying vessels. Both the AI and the permit inspector therefore end up looking at the same question: is the NDE good enough to see what the damage mechanism would do? For the interval arithmetic see API 510 interval calculation explained; for the NBIC side, API 510 vs NBIC commissioned inspector.

NDE methods for API 510 work in Indiana

Direct answer: UT thickness and corrosion mapping provide the trend data for corrosion rate and the permit inspector's review; PAUT, TOFD and WFMT address cracking in sour, amine, coker and cyclic services; ET, RT, PT and VT cover exchangers, welds and stainless equipment, and several of these are the alternate methods Indiana's rules name.

Method	What it finds	Typical Indiana application	Governing reference
UT thickness at CMLs	General wall loss; corrosion rate and remaining life data	Whiting and Mount Vernon refinery vessels; steel-mill receivers and deaerators	API 510; ASME Section V; 675 IAC 30 alternate methods
Automated UT corrosion mapping	Localised corrosion, pitting, HIC and blistering	Sour water and amine vessels; coke by-product vessels; ethanol scrubbers	API 510; API 571; ASME Section V
PAUT	Weld cracking and fusion flaws sized from outside	Coke drum and hydroprocessing welds; external alternative to internal inspection where accepted	ASME Section V Article 4
TOFD	Through-wall sizing of planar flaws	Heavy-wall reactors and repair welds before return to service	ASME Section V Article 4
WFMT (wet fluorescent MT)	Surface-breaking cracks in welds and HAZ	Internal welds of amine, wet H2S and caustic vessels during outages	ASME Section V Article 7; API 571
ET	Tube thinning and cracking	Exchanger bundles at Whiting, Mount Vernon, power stations and pharmaceutical plants	ASME Section V Article 8
RT	Volumetric weld flaws; profile RT for wall loss	Nozzle and repair welds; small-bore connections on receivers	ASME Section V Article 2; NBIC Part 3
PT and VT	Surface cracks on stainless; overall condition, including borescope VT	Pharmaceutical reactors and autoclaves around Indianapolis and Lafayette	ASME Section V Articles 6 and 9; API RP 572

When a vessel is examined by an alternate method instead of being opened, the coverage plan matters as much as the technique. We document scan areas, grid density, the damage mechanism each technique targets and any areas that could not be covered, so the AI and the permit inspector can judge whether the examination is adequate. Damage-mechanism background is in our API 571 guide.

Industrial radiography licensing in Indiana has just changed: Indiana signed an agreement with the NRC in September 2026 and became the 41st Agreement State, taking over licensing, inspection and enforcement for most radioactive materials, including industrial radiography sources, from the NRC. RT is performed by crews licensed for work in Indiana; because the transfer is so recent, confirm current licensing authority with the state.

How Atlantis supports your Authorized Inspector

Direct answer: Atlantis turns the AI's plan into Level III-reviewed procedures, performs the examinations with ASNT-certified technicians and delivers a digital report the AI evaluates and signs, and that the commissioned inspector renewing the operating permit can rely on. We are not an Authorized Inspection Agency and we do not supply API-certified inspectors.

At Indiana refineries and large chemical plants, the commissioned inspector who renews the permit often works for the owner's own owner-user inspection agency, sometimes alongside the API 510 AI. At smaller sites, the permit inspection is done by an insurance company's commissioned inspector. Atlantis sits underneath both as the NDE contractor:

Plan intake. Vessel list, CML map, damage mechanisms, inspection type and due dates from the AI's plan, plus permit expiry dates so one campaign can serve both.
Procedures. UT, corrosion mapping, PAUT, TOFD, WFMT, ET and RT techniques prepared or reviewed by an ASNT NDT Level III, with coverage plans where an alternate method is proposed instead of internal entry.
Field execution. Crews mobilised to your site; the schedule is agreed during scoping around unit status, mill outages, permits and confined-space entry.
Data QA. Readings compared with history; anomalies re-shot while access exists.
Digital report. CML IDs, readings, C-scans, indication tables, photos, calibration and equipment records and technician certifications in Atlantis's reporting platform.
Evaluation and sign-off. The AI determines rates, remaining life, intervals and repairs; the commissioned inspector completes the permit inspection report. Atlantis performs the NDE; your API 510 Authorized Inspector remains inspector of record and signs the inspection report.
Next cycle. CML structure carries forward for like-for-like trending.

Where the owner's engineers run RBI or a fitness-for-service assessment, our maps and flaw sizes are inputs to work done by the owner's engineers or a specialist. More detail: API 510 pressure vessel NDE support and pressure vessel inspection services.

Indiana regulations that sit on top of API 510

Direct answer: The Indiana Department of Homeland Security's boiler and pressure vessel programme enforces 675 IAC 30: operating permits, three-year permits for unfired vessels unless results justify shorter, internal inspection per NBIC Part 2 or API 510 for corroding vessels, and alternate NDE methods in lieu of internal inspection. IOSHA enforces process safety. Confirm details with the department.

675 IAC 30. The Indiana Boiler and Pressure Vessel Rules, adopted under the Fire Prevention and Building Safety Commission, require that no regulated boiler or unfired pressure vessel operate without an operating permit unless exempt. Operating permits for unfired pressure vessels expire three years after issuance, unless the inspection results indicate that a one- or two-year permit should be issued. External inspections follow the permit cycle; internally corroding vessels follow NBIC Part 2 or API 510; and the alternate examination provision lists methods such as UT thickness, PAUT, eddy current, radiography and borescope. Owners who need more time must request an extension before the permit expires. Exemptions in Indiana's rules include, among others, certain vessels under federal regulation, DOT transport vessels, vessels protected by relief devices set at no more than 15 psig, and LP-gas vessels regulated elsewhere; check the current rule text for your equipment.

Who inspects. State inspectors, commissioned insurance-company inspectors and commissioned inspectors employed by owner-user inspection agencies all perform permit inspections in Indiana. The owner-user route is common at refineries and large chemical plants, where the inspection department maintains its own records and reports to the state.

IOSHA and EPA. Indiana runs its own OSHA state plan, IOSHA, within the Indiana Department of Labor, which enforces process safety management requirements equivalent to 29 CFR 1910.119. The mechanical integrity element requires written procedures, inspection and testing that follow RAGAGEP, documented inspections and correction of deficiencies; for pressure vessels that means API 510 in nearly every refinery and chemical programme. EPA's Risk Management Program (40 CFR Part 68) Program 3 parallels it.

Pipelines at the fence. The Indiana Utility Regulatory Commission's pipeline safety division oversees intrastate gas operators with PHMSA, and interstate gas and hazardous liquid lines fall to PHMSA under 49 CFR Parts 192 and 195. Pig launchers, receivers and separators near custody points need a clearly assigned code and inspection programme.

Planning around turnarounds, mill outages and the permit cycle

Direct answer: Line up permit expiry dates with API 510 due dates, use on-stream NDE (including Indiana's alternate methods) to reduce the number of vessels opened, book turnaround NDE early because Whiting and the Chicago-area refineries share the same labour pool, and work steel-mill outages to the mill's production calendar.

Permit alignment: list each vessel's permit expiry next to its API 510 internal and external due dates; plan one entry or one alternate-method examination that serves both.
Alternate methods early: where external NDE may replace an internal inspection, agree the technique and coverage with the AI and the permit inspector before the outage, not during it.
Whiting turnarounds: large refinery outages need heavy-wall TOFD, coke drum weld PAUT and WFMT of sour and amine vessels scheduled from the start.
Steel-mill outages: often planned around holidays and production, with short windows; on-stream UT of receivers and gas-service vessels reduces the outage scope.
Pharmaceutical campaigns: NDE on stainless reactors has to fit between batches and cleaning validation.
Weather: lake-effect snow in the Calumet Region and humid Ohio River summers both affect external work; plan CUI and large external campaigns for spring and autumn where possible.

Insulated vessels along Lake Michigan and the Ohio River are prone to CUI; see CUI inspection support.

API 510 inspection support across Indiana

Direct answer: Atlantis supports API 510 and permit-cycle vessel programmes from the Calumet Region to Indianapolis and the Ohio River. Crews are mobilised to your site, and the schedule is agreed during scoping.

Indianapolis and central Indiana: pressure vessel inspection in Indianapolis, with corrosion, piping, tank and third-party inspection in Indianapolis.
Whiting, East Chicago, Hammond and Gary: refinery, steel-mill and terminal vessels; a digital twin for Whiting-area assets is available where owners want results in 3D.
Burns Harbor and Porter County: integrated steel and port industry.
Mount Vernon, Evansville and the Ohio River: refinery, plastics, aluminium, chemical and power-plant vessels.
Lafayette, Terre Haute and rural Indiana: pharmaceutical, corn processing, ethanol, soybean and power stations.

Sibling hubs: API 570 piping inspection in Indiana and API 653 tank inspection in Indiana. For all methods statewide, NDT inspection services in Indiana; for procedures and written practices, NDT consulting in Indiana; for in-house technicians, ASNT NDT training in Indiana.

Making the alternate-method route defensible

Direct answer: If external NDE is going to replace an internal inspection, the AI and the permit inspector need to see that the technique targets the damage mechanism, that coverage is adequate, and that personnel are qualified. Atlantis documents all three in the report.

In practice that means: the damage mechanism and expected morphology stated up front (general thinning, localised pitting, blistering, cracking); a technique matched to it (grid UT for general loss, automated mapping for localised loss, PAUT or TOFD for planar flaws, ET for tubes); a coverage map showing where data was collected and at what resolution; calibration and probe records; and technician certifications under the employer's ASNT SNT-TC-1A written practice with Level III oversight. We keep your CML numbering and record locations that could not be read. Corrosion-rate and remaining-life figures can be calculated from our data for the AI's review, but the decision to credit the examination is the AI's and the inspector's. Results can be linked to a digital twin, tracked against permit expiry in our inspection-management ERP and delivered in formats shown on NDT report templates. Ask us to scope an alternate-method examination.

What to send us for an Indiana quote

Direct answer: Send the vessel list, the AI's plan and CML map, the latest API 510 and permit inspection reports, permit expiry dates, access status and target dates. We quote within 24 hours of having that information.

Vessel tags, U-1 data reports or nameplate data, Indiana and National Board numbers, drawings and materials.
The last API 510 report, the last permit inspection report and thickness history.
The AI's inspection plan, CML map and damage mechanisms of concern.
Permit expiry dates and whether an alternate method is proposed instead of internal entry.
Inspection type, cleaning and entry status, insulation and access.
Dates, outage window and site safety requirements.

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

Frequently asked questions: API 510 in Indiana

Does Indiana require pressure vessel inspections?

Yes, for regulated, non-exempt vessels. Under 675 IAC 30, a vessel needs an operating permit, and unfired pressure vessel permits normally run three years, or one or two years if inspection results justify it. Confirm current rules and exemptions with the Indiana Department of Homeland Security.

Can UT replace an internal inspection in Indiana?

For qualifying unfired pressure vessels, Indiana's rules allow an alternate examination method that ensures integrity and safe operation, including UT thickness, phased array UT, eddy current, radiography or borescope, performed by qualified personnel. The inspector and AI decide whether a given examination is acceptable.

Who can inspect pressure vessels in Indiana?

Permit inspections are made by state inspectors, commissioned insurance-company inspectors or commissioned owner-user agency inspectors. API 510 inspections are signed by the owner's AI. Atlantis performs the NDE for both.

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, capped at two years when remaining life is under four. RBI can set different intervals.

Is Atlantis an Authorized Inspector?

No. We are not an Authorized Inspection Agency and we do not supply API-certified or state-commissioned inspectors. Independent NDE data is what we deliver.

Is Indiana an NRC Agreement State now?

Yes. Indiana signed its agreement with the NRC in September 2026 and became the 41st Agreement State, taking over most radioactive-materials licensing. Confirm current requirements with the state before radiography work.

Which OSHA programme applies to Indiana process plants?

IOSHA, Indiana's state plan under the Indiana Department of Labor, enforces process safety management, including mechanical integrity, at refineries and chemical plants.

Can you inspect pressure equipment in steel mills?

Yes. We perform UT thickness, corrosion mapping, PAUT and MT on receivers, air separation, gas-service and powerhouse vessels, scheduled around mill outages.

What will the report contain?

CML IDs and readings, C-scan maps, indication tables, photos, coverage records, calibration and equipment data and technician certifications, in a digital format the AI can review and archive.

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 Indiana for NDE skills.

How quickly can you mobilise to Whiting or Mount Vernon?

We quote within 24 hours once we have the scope, and the mobilisation date is agreed during scoping.

Next step

To prepare NDE that supports your AI and your next Indiana permit inspection, 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 Indiana

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

Speak to an ASNT NDT Level III

Atlantis NDT provides ASNT Level III consulting, NDT training to ASNT SNT-TC-1A, inspection management software and independent report validation. Request a free consultation and we will return a tailored quote — affordable, accessible and fully customizable to your programme.