API 653 Tank Inspection Support in Pennsylvania

Short answer: Pennsylvania is one of the few states that writes API 653-style tank inspections into its own regulations. Under 25 Pa. Code Chapter 245, regulated aboveground tanks need periodic in-service and out-of-service inspections by a DEP-certified tank inspector, and inspectors of field-constructed tanks must also hold API 653 certification. That inspector evaluates the data and signs. Atlantis performs the NDE behind it: floor MFL with UT prove-up, shell UT, weld examination and settlement data.

Pennsylvania's tank population is quieter than the Gulf Coast's but older, and it is regulated more directly. Refined products move by pipeline and river into terminals around Philadelphia, Harrisburg and Pittsburgh. A small number of refineries still operate, and chemical, power and Marcellus Shale operations add their own storage. The state's Storage Tank and Spill Prevention Act and DEP's Chapter 245 rules turn inspection intervals into regulatory deadlines with named inspector qualifications. This page sets out where the tanks are, what API 653 and Chapter 245 each require, the NDE methods that supply the data, and where Atlantis fits. Atlantis performs the NDE; your API 653 Authorized Inspector remains inspector of record and signs the inspection report. To begin, send us your Pennsylvania tank list.

Where API 653 tanks are in Pennsylvania

Direct answer: Pennsylvania's field-erected tanks sit mainly in the Philadelphia and Delaware River corridor (refinery, products and NGL terminals), the Harrisburg and central Pennsylvania pipeline terminals, the Pittsburgh region's river terminals and petrochemical sites, northwestern Pennsylvania's refining and oil country, and Marcellus Shale production areas in the northeast and southwest.

Philadelphia, Delaware County and the Delaware River

The lower Delaware River has long been the state's refining and terminal hub. The large South Philadelphia refinery closed after a 2019 fire and the site is being redeveloped, but a refinery at Trainer in Delaware County still operates, and the Marcus Hook industrial complex has been reconfigured for natural gas liquids storage and export. Product terminals along the river and in South Philadelphia receive gasoline, diesel, heating oil and jet fuel by pipeline, ship and barge. Many tanks here were built decades ago and have been repaired, re-bottomed or changed in service several times, so the quality of the inspection history matters as much as current condition.

Harrisburg, Lancaster and central Pennsylvania

Refined-products pipelines carry fuel from the Philadelphia area and other supply points west across the state to terminals near Harrisburg, Altoona, Williamsport and beyond. These distribution terminals hold numbers of mid-sized product tanks, often with internal floating roofs, plus additive and ethanol tanks. Many sites operate with small crews, which makes efficient external inspection campaigns valuable.

Pittsburgh and the three rivers

Barge-fed terminals line the Ohio, Allegheny and Monongahela rivers, alongside chemical plants, coke and steel operations, power stations, and the large polyethylene complex at Monaca in Beaver County. Tanks hold fuels, asphalt, chemicals and process water. River flood stages and freeze-thaw cycles both affect foundations.

Northwestern Pennsylvania

The birthplace of the US oil industry still has a refinery at Warren, specialty and lubricant operations, and older production and gathering tankage in the historic oil region. Riveted and early welded tanks are not unusual here, and API 653 covers riveted tanks as well as welded ones.

Marcellus Shale regions

Northeastern and southwestern Pennsylvania host natural gas production with produced-water and condensate storage, compressor stations and gathering facilities. Oil and gas well-site tanks are generally governed by DEP's oil and gas regulations rather than Chapter 245, but larger centralised storage and midstream facilities can fall under storage-tank, SPCC or pipeline rules, so applicability should be confirmed tank by tank.

What API 653 requires, in plain terms

Direct answer: API 653, currently the Fifth Edition with addenda through Addendum 4 (July 2025), covers inspection, repair, alteration and reconstruction of in-service atmospheric steel tanks built to API 650 or API 12C, including riveted tanks. It requires routine monthly checks, formal external inspections, shell thickness surveys and internal inspections on corrosion-based intervals. Pennsylvania adds its own deadlines through Chapter 245.

Routine in-service inspections. Owner or operator personnel inspect the tank visually at an interval suited to the site, but at least monthly, looking for leaks, distortion, settlement, coating failure, roof and seal problems and foundation deterioration. In Pennsylvania winters, ice and snow loads on roofs and frozen roof drains deserve particular attention.

External inspections. The Authorized Inspector performs a formal external inspection at least every five years, or more often where the shell corrosion rate is high, in which case the interval is tied to a quarter of the remaining shell corrosion life.

Shell UT. Shell thickness is measured at least every five years while the corrosion rate is unknown; once known, the interval is based on half the remaining shell corrosion life, up to fifteen years.

Internal inspections. For a new tank, the code sets a ten-year initial internal interval that safeguards such as linings, cathodic protection, leak detection and release prevention barriers can extend, to a ceiling of twenty years without a release prevention barrier or thirty years with one. Subsequent intervals follow measured floor corrosion rates and the minimum bottom thickness the code accepts at the next inspection, within the same ceilings, or a qualifying risk-based programme. Settlement is evaluated against the code's settlement annex.

Note that Pennsylvania's own out-of-service cap is tighter than the longest API 653 ceiling; see the regulations section below. Interval decisions belong to the owner and inspector, not to Atlantis. For background, see API 653 tank inspection intervals explained, and confirm details against the current edition from api.org.

Pennsylvania regulations that sit on top of API 653

Direct answer: Pennsylvania DEP's Storage Tank and Spill Prevention Program, codified at 25 Pa. Code Chapter 245, requires in-service and out-of-service inspections of regulated aboveground tanks by DEP-certified inspectors, following API 653 and similar standards, on fixed maximum intervals. Federal SPCC, PHMSA breakout-tank rules, and OSHA PSM apply as well. Confirm current requirements with DEP.

Chapter 245 in-service inspections

Under Chapter 245, a regulated aboveground storage tank must have its first in-service inspection within five years of installation. After that, in-service inspections follow the API 653 calculated service-life method or a quarter of the corrosion-rate life, with no more than five years between inspections. The inspection must follow a nationally recognised standard such as API 653 (and API 570 for associated piping), and the inspection record includes shell and piping corrosion rates, a calculation of remaining life and the next inspection date. Tanks storing highly hazardous substances have shorter intervals.

Chapter 245 out-of-service inspections

Where the bottom corrosion rate is unknown, for example on a new bottom, the actual bottom thickness must be determined by inspection within ten years of installation. Subsequent out-of-service inspections follow the API 653 calculated service life or half the corrosion-rate life, with a maximum of twenty years since the previous out-of-service inspection. That twenty-year cap applies even where API 653 alone would allow a longer interval for a tank with a release prevention barrier, so Pennsylvania owners should plan to the state limit. An out-of-service inspection may take the place of an in-service inspection.

DEP-certified inspectors

Chapter 245 inspections must be performed by DEP-certified tank inspectors. Inspectors of field-constructed tanks (the IAF category) must also hold API 653 certification, and inspectors of manufactured, shop-built tanks hold the IAM category; certified inspectors complete DEP-provided training. In practice, the API 653 Authorized Inspector on a Pennsylvania field-erected tank is usually also the DEP-certified IAF inspector who signs the state inspection. Atlantis is neither: we perform the NDE that inspector relies on.

Federal SPCC, PHMSA and OSHA

The EPA SPCC rule (40 CFR Part 112) requires integrity testing of bulk storage containers to industry standards on a regular schedule and after material repairs; API 653 and STI SP001 are the usual standards, and Chapter 245 inspections can be documented in the SPCC plan. Breakout tanks on regulated hazardous-liquid pipelines must be inspected per API 653 under 49 CFR 195.432, which currently references the 2001 Third Edition and excludes the risk-based internal-interval option; a June 2026 PHMSA proposed rule would update the edition. The Pennsylvania Public Utility Commission carries out pipeline safety oversight for jurisdictional intrastate systems, with PHMSA covering interstate lines. Tanks in OSHA PSM-covered processes fall under 29 CFR 1910.119(j) mechanical integrity.

NDE methods for API 653 work in Pennsylvania

Direct answer: The NDE behind a Pennsylvania tank inspection is floor MFL scanning with UT prove-up, shell and critical-zone UT that feeds the Chapter 245 corrosion-rate calculation, visual examination, surface methods and vacuum-box testing after repairs, volumetric testing of new welds, and settlement data. Older riveted and repeatedly repaired tanks need extra care.

Method	What it finds	Typical Pennsylvania application	Governing reference
Floor MFL with UT prove-up	Soil-side and product-side pitting and general loss on bottom plates	Chapter 245 out-of-service inspections at Delaware River and Pittsburgh terminals; first bottom-thickness determinations on new bottoms	API 653 bottom evaluation; ASME Section V for UT
Shell UT thickness	Wall loss by course and location, used to calculate shell corrosion rate and remaining life	Five-year-maximum in-service inspections under Chapter 245	API 653 shell evaluation; ASME Section V
Critical-zone and annular-plate UT	Bottom thinning near the shell	Tanks with wet or frost-affected foundations and failed chime seals	API 653 critical-zone provisions
Automated UT corrosion mapping	Area maps of wall loss on shell plates and nozzles	Older terminal tanks with patch plates and known local corrosion	ASME Section V; owner procedure
Visual examination	Riveted seam leaks, coating failure, roof and seal damage, foundation spalling from freeze-thaw	Every external inspection; riveted tanks in the historic oil region	API 653; API RP 575 practice
MT, PT and vacuum-box testing	Cracks and leak paths in floor welds, shell-to-bottom welds and repairs	Re-bottoming, floor patching and nozzle repairs	API 653 repair examination; API 650; ASME Section V
PAUT or RT	Volumetric flaws in new shell and nozzle welds	Shell plate replacement, alterations and reconstruction	API 650 and API 653
Settlement survey data	Tilt, differential and edge settlement	Riverbank terminals on fill; tanks on frost-susceptible foundations	API 653 settlement annex, evaluated by the inspector

Radiography is carried out only by crews licensed for industrial radiography in Pennsylvania. Procedures are reviewed by an ASNT NDT Level III, and technicians are certified to an SNT-TC-1A written practice. See aboveground storage tank inspection and API 653 tank inspection support for scope detail.

How Atlantis supports your Authorized Inspector

Direct answer: Atlantis performs the examinations your API 653 and DEP-certified inspector specifies, checks the data, and delivers it in a form that feeds both the API 653 report and the Chapter 245 inspection record. The inspector evaluates and signs. We are not an Authorized Inspection Agency and we do not supply API-certified or DEP-certified inspectors.

Scope from the inspector's plan: required examinations, coverage, and the data the Chapter 245 record needs, such as readings at consistent locations so corrosion rates can be calculated.
Level III procedure review for materials, coatings and tank construction, including riveted shells.
Examinations: floor scanning and prove-up, shell and critical-zone UT, weld examinations and settlement readings.
Data QA against calibration records and the previous inspection before demobilisation.
Digital report in our reporting platform: floor maps, shell readings by course and location, weld records, photographs, calibration data and technician certifications, using report templates that match the inspector's file.
Inspector evaluation and sign-off, including corrosion-rate and remaining-life conclusions, repair decisions and the next inspection date.
Reuse at the next interval, with tracking in our inspection-management ERP or a digital twin.

We can calculate corrosion rates and remaining life from our thickness data for the inspector's review; the inspector and owner make the decisions. Atlantis performs the NDE; your API 653 Authorized Inspector remains inspector of record and signs the inspection report. Request an NDE scope for your inspector's plan.

Planning around winter, river levels and terminal operations

Direct answer: Pennsylvania shell UT and external inspections can run in service most of the year, but internal inspections are usually scheduled from spring to autumn, when cleaning, coating repair and floor scanning are not hampered by freezing temperatures, and around heating-oil and gasoline seasonal demand at product terminals.

Weather. Cold weather affects couplant behaviour, battery life, coating cure and technician safety on roofs and stairways. MFL scanning in a cold, damp tank is possible but slower, and repair welding and coating work afterwards are easier in milder months. Many terminals therefore schedule out-of-service work between April and October.

Seasonal demand. Product terminals carry more distillate inventory in winter and more gasoline in summer, so the tank that can be taken out of service changes through the year. Planning a multi-year rotation that aligns Chapter 245 due dates with seasonal availability avoids last-minute outages.

River levels. Barge-fed terminals in Pittsburgh and on the Delaware are affected by high water and flooding, which can also disturb foundations. A settlement survey after a significant flood, compared with the previous survey, gives the inspector evidence on whether the tank moved.

Regulatory deadlines. Because Chapter 245 sets hard maximum intervals, a slipped outage can become a compliance problem. Book NDE early, confirm coverage with your inspector, and have the crew arrive the day the tank is released for entry. Book a scoping call with your due dates.

API 653 inspection support across Pennsylvania

Direct answer: Atlantis mobilises crews to tank sites across Pennsylvania, with the schedule agreed during scoping. The pages below cover tank, corrosion, piping, pressure-vessel and pipeline inspection in Philadelphia and Pittsburgh, the state's two main industrial centres.

Philadelphia and the Delaware River:tank inspection in Philadelphia and corrosion inspection in Philadelphia.
Pittsburgh and western Pennsylvania:tank inspection in Pittsburgh, corrosion inspection in Pittsburgh and pipeline inspection in Pittsburgh.

Chapter 245 inspections also cover associated piping, and many terminals operate pressure equipment; see our companion hubs for API 570 piping inspection in Pennsylvania and API 510 pressure vessel inspection in Pennsylvania, and the statewide NDT inspection services in Pennsylvania page. Pipeline operators can also see pipeline inspection services.

What to send us for a quote

Direct answer: Send the tank list, the last API 653 and Chapter 245 inspection reports, your inspector's required examinations, access and cleaning status, and the due dates. We will return a scoped NDE quote within 24 hours.

Tank list and drawings: DEP tank registration numbers, diameter, height, roof type, product, construction (welded or riveted), plate thicknesses, lining and cathodic protection details.
Last inspection reports: previous in-service and out-of-service reports, floor maps, shell readings and settlement surveys, so corrosion rates can be calculated at the same locations.
The inspector's plan: required examinations, coverage and report format, plus the name of your DEP-certified inspector.
Access and cleaning: in-service or out-of-service, cleaning contractor, gas-free and confined-space arrangements, scaffold or rope access.
Dates: Chapter 245 due dates, outage windows, seasonal constraints and site safety requirements.

Get a quote within 24 hours.

Frequently asked questions: API 653 tank inspection in Pennsylvania

Who can perform an aboveground storage tank inspection in Pennsylvania?

Chapter 245 inspections must be performed by DEP-certified tank inspectors; for field-constructed tanks the inspector must also hold API 653 certification. NDE contractors perform the examinations. Atlantis performs that NDE with ASNT-certified technicians under Level III oversight and delivers results to your inspector.

Does Pennsylvania require API 653 inspections by law?

Effectively yes for regulated aboveground tanks: Chapter 245 requires in-service and out-of-service inspections following a nationally recognised standard such as API 653, on maximum intervals, by DEP-certified inspectors. SPCC, PHMSA and OSHA PSM can also apply. Confirm applicability with DEP.

How often are in-service inspections required under Chapter 245?

The first within five years of installation, then at the API 653 calculated service life or a quarter of the corrosion-rate life, with no more than five years between inspections. Tanks storing highly hazardous substances have shorter intervals.

How often are out-of-service inspections required in Pennsylvania?

Bottom thickness must be determined within ten years of installation where the corrosion rate is unknown. After that, at the API 653 calculated service life or half the corrosion-rate life, with a maximum of twenty years between out-of-service inspections.

What is the difference between IAF and IAM inspectors?

Both are DEP certification categories for aboveground tank inspectors. IAF covers field-constructed tanks and also requires API 653 certification; IAM covers manufactured, shop-built tanks. Check DEP's current certification rules for details.

Is Atlantis a DEP-certified inspector or an API Authorized Inspector?

No. We are not an Authorized Inspection Agency and we do not supply API-certified inspectors or DEP-certified inspectors. We perform and interpret the NDE; your inspector evaluates it and signs as inspector of record.

What NDE methods are used for Pennsylvania tank inspections?

Floor MFL with UT prove-up, shell and critical-zone UT for corrosion-rate calculation, corrosion mapping, visual examination, MT, PT and vacuum-box testing after repairs, PAUT or RT of new welds, and settlement surveys.

Can you inspect while the tank stays in service?

Yes for external visual examination, shell UT and settlement readings, which support in-service inspections. Floor scanning and internal weld examination require the tank emptied, cleaned and gas-free.

What certifications do your technicians hold?

Technicians are certified to an ASNT SNT-TC-1A written practice for each method, with procedures reviewed by an ASNT NDT Level III. Radiography is performed only by crews licensed for industrial radiography in Pennsylvania.

Do you perform RBI or fitness-for-service assessments?

No. Those assessments are carried out by the owner's engineers or specialist consultants. Atlantis supplies the inspection data they use.

Do you offer API 653 or DEP inspector training?

No. Atlantis provides ASNT SNT-TC-1A NDT training only, including NDT training in Pennsylvania. For the API certification route, see our API inspector career guide.

How soon can a crew reach Philadelphia or Pittsburgh?

Crews are mobilised to your site on a schedule agreed during scoping, built around your Chapter 245 due dates and outage window. Send tank details for a quote within 24 hours.

Plan your Pennsylvania tank inspections

Whether you need a five-year in-service inspection at a Harrisburg terminal or a re-bottoming inspection on the Delaware, start with your inspector's plan and your tank list. Send us your tank list, or see NDT consulting in Pennsylvania for Level III procedure support.

More Atlantis NDT services in Pennsylvania

Part of the wider aboveground storage tank inspection service at 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.