API 570 Piping Inspection Support in Louisiana

Short answer: In Louisiana, API 570 inspection of refinery, chemical and LNG process piping is planned and signed by the owner's API 570 Authorized Inspector (AI). Atlantis NDT performs the nondestructive examinations the AI's plan calls for: UT thickness at condition monitoring locations (CMLs), corrosion mapping of injection points, profile radiography, guided-wave screening, CUI follow-up, and PAUT or TOFD on welds. Atlantis performs the NDE; your API 570 Authorized Inspector remains inspector of record and signs the inspection report.

Louisiana piping lives in a hard environment. Plants sit on river levees, marsh and coastal prairie, with near-constant humidity, heavy rainfall, salt air on the coast and soft, wet soils that keep buried and grade-level piping damp. That combination makes corrosion under insulation, soil-to-air interface attack and external corrosion at pipe supports as important as the process-side damage mechanisms inside the lines. This page maps Louisiana's piping population by corridor, explains how API 570 organises it, lists the NDE that fits, sets out the state and federal rules at the plant fence, and shows how Atlantis feeds clean data to your AI. Ready to scope? Request an NDE scope for your AI's plan.

Where API 570 piping is in Louisiana

Direct answer: Louisiana's API 570 piping is concentrated along the Mississippi River industrial corridor from Baton Rouge to New Orleans, in the Lake Charles and Calcasieu-Cameron refining and LNG cluster, on the lower river and Plaquemines Parish, and in the gas-processing and terminal hubs of Acadiana and Lafourche. River plants, coastal LNG and inland gas plants each bring different damage mechanisms.

Baton Rouge, Plaquemine and Geismar

The capital region pairs the ExxonMobil Baton Rouge refinery and chemical plant with a dense chemical belt: Dow's Plaquemine site across the river, and the chlor-alkali, isocyanate, polymer and specialty chemical complexes around Geismar, Gonzales and St. Gabriel. Process piping here includes crude and vacuum overheads, hydrotreater effluent, alkylation acid lines, chlorine and caustic service, and long interconnecting racks. Chlorine, HCl and caustic service shift the inspection plan toward crack detection and close attention to materials and spec breaks, while refinery piping carries the familiar ammonium chloride and sour-water threats.

The river corridor: Donaldsonville to New Orleans

Downstream of Baton Rouge the river is lined with plants on both banks: the CF Industries ammonia and nitrogen complex at Donaldsonville; the Marathon Garyville refinery; the St. James terminals; the Shell Norco complex and Valero St. Charles refinery around Norco; chemical plants in St. Charles and St. John the Baptist parishes; and the PBF Chalmette refinery and Valero Meraux refinery below New Orleans. Ammonia and nitrogen plants bring stress corrosion cracking concerns in ammonia service and high-temperature hydrogen service in synthesis loops. Refineries add hydroprocessing and crude-unit circuits with injection points. Terminals add product transfer headers and dock lines where API 570 piping meets marine and pipeline boundaries.

Lake Charles, Westlake, Sulphur and Cameron Parish

Southwest Louisiana combines refining (Citgo Lake Charles, Phillips 66 Lake Charles, Calcasieu Refining), petrochemicals (Sasol's Lake Charles complex and Westlake's chlor-vinyl and olefins plants) and the LNG export terminals at Sabine Pass, Cameron LNG near Hackberry and Calcasieu Pass. LNG piping is largely stainless and low-temperature carbon steel: cold and cryogenic lines bring chloride stress corrosion cracking under insulation and moisture ingress through damaged vapour barriers, while amine pre-treatment and fuel-gas systems bring conventional carbon-steel corrosion. The region took direct hits from Hurricanes Laura and Delta in 2020, which made post-storm external inspection of racks, insulation and supports a real part of the piping programme.

Plaquemines, Lafourche and the offshore supply coast

Plaquemines LNG and terminals on the lower river, the Louisiana Offshore Oil Port's onshore facilities at Clovelly, and the Port Fourchon offshore supply base form the coastal end of the state's piping map. Offshore platform piping on the Outer Continental Shelf falls under federal offshore rules administered by BSEE rather than this onshore discussion, but onshore receiving terminals, tank farms and process piping on the coast are typical API 570 scope, and salt exposure is severe.

Acadiana and north Louisiana gas processing

Gas processing plants, compressor stations and NGL facilities around Lafayette, Erath (home of the Henry Hub pricing point), Houma and in the Haynesville region of northwest Louisiana carry amine, dehydration and compression piping where wet CO2 and H2S, produced water and vibration of small-bore piping drive the plan.

What API 570 requires, in plain terms

Direct answer: API 570 covers in-service inspection, repair, alteration and rerating of metallic piping and its relief devices. The owner groups piping into circuits, classes each by the consequence of a leak, locates CMLs where damage is expected, and inspects at intervals set by class and remaining life, unless a qualifying RBI programme sets them. The AI evaluates and signs.

The current edition is the fifth, published by API in February 2024; API RP 574, the companion inspection-practices document, was reissued alongside it with expanded guidance on choosing inspection activities and locations. API says the fifth edition adds an Inspection Supervisor role, strengthens requirements for pressure-relieving devices and adds rules for deferring inspection repair recommendations. Work from a licensed copy (api.org); free copies online are usually old editions.

In plain terms, the code asks for:

• A piping inventory organised into circuits with similar material, conditions and damage mechanisms, each with a service class reflecting leak consequence. The highest class is reserved for services where a leak could become an emergency at once (auto-refrigerating flammables, rapidly vaporising light ends, high-H2S gas, hydrofluoric acid, piping over public roads and waterways, a point worth noting in a state where plants sit beside the river and highways). Most unit piping falls in the middle class; lines that do not vaporise significantly fall lower; a fourth, owner-discretion class appears in recent editions.
• CMLs placed by damage mechanism using API RP 571 and RP 574: more where corrosion is high or variable, localised attack is possible or geometry is complex; fewer on long, benign runs. The fourth edition (2016) called for CMLs at continuing CUI areas, soil-to-air interfaces and either side of material changes, marked on isometrics.
• Thickness intervals at the shorter of half the calculated remaining life or the class maximum in the code's interval table, and external visual inspections by class. The 1998 second edition (historical, not current) set Class 1 at five years for both, Class 2 at ten years thickness and five external, Class 3 at ten and ten, and injection points at three years thickness. Confirm the fifth-edition table before setting any date.
• Special areas: injection points, deadlegs, CUI, small-bore and auxiliary piping, soil-to-air interfaces and buried piping, each with its own approach.
• Controlled repairs, alterations and rerates, authorised by the inspector, done by a repair organisation, with the piping engineer involved for alterations and rerates. ASME B31.3 remains the construction code; API 570 does not substitute for it.

Corrosion rates come from CML readings over time; remaining life is the thickness above the required minimum divided by the governing rate. Atlantis can calculate both from its data for the AI's review; the interval decision is the AI's and the owner's. Read more in API 570 code requirements and what triggers an internal piping inspection.

Soil-to-air, buried piping and CUI: the Louisiana problem

Direct answer: High water tables, wet clay soils, rain and salt air make external corrosion the leading piping threat in many Louisiana plants. API 570 has specific guidance for soil-to-air interfaces, buried process piping not regulated by DOT, and CUI, and each needs a different NDE approach.

Soil-to-air interfaces. Where pipe enters or leaves the ground, or lies on grade in contact with soil, moisture and oxygen concentrate attack. The 2016 fourth edition described the zone as extending from at least 12 inches below to 6 inches above the soil surface, with no fixed thickness interval and external visual by class; confirm in the current edition. In Louisiana, grade-level pipe in ditches, sleeved road crossings and dike penetrations are classic locations. We combine excavation-assisted VT and UT with guided-wave screening that can look along the buried section from an above-ground location, then follow up indications with quantitative UT.

Buried process piping. API 570 includes a section for buried process piping that is not DOT-regulated, pointing to API RP 574, API RP 651 and NACE (now AMPP) cathodic-protection standards. The fourth edition's table tied inspection of buried piping without effective cathodic protection to soil resistivity, with more frequent inspection in low-resistivity (more corrosive) soils, which are common in the coastal parishes; check the current edition. Options include in-line inspection where piggable, excavation and direct examination, guided-wave screening and pressure-based leak testing. Atlantis supports the excavation NDE and guided-wave screening; in-line inspection tools are a specialist pipeline service we do not offer.

CUI. Insulated carbon and low-alloy steel operating within the temperature range where CUI is active, intermittent and dual-temperature service, steam-traced lines and cold LNG lines with failing vapour barriers all suffer in Louisiana's humidity. The code requires an external visual check on CUI-susceptible systems with follow-up NDE or insulation removal targeted by class; earlier editions gave target percentages that facilities with CUI history were expected to adjust. We support that with profile RT through insulation, UT at inspection ports, guided-wave screening on straight runs and UT after stripping. For austenitic stainless CUI cracking we add PT after insulation removal. See our CUI inspection page.

NDE methods for API 570 work in Louisiana

Direct answer: Louisiana programmes rest on UT thickness at CMLs, with corrosion mapping for injection points and elbows, profile RT for small-bore and insulated lines, guided-wave screening for buried, sleeved and long runs, PAUT or TOFD for welds, and PT or MT for cracking in chlorine, caustic, ammonia and stainless LNG service.

Radiography in Louisiana is performed by crews licensed for industrial radiography through the Louisiana Department of Environmental Quality's radiation programme (Louisiana is an NRC Agreement State); confirm current licensing details with LDEQ. Method choice follows the circuit's damage mechanisms, summarised in our API 571 guide.

How Atlantis supports your Authorized Inspector

Direct answer: We execute the NDE part of the AI's plan: procedures under ASNT Level III oversight, examinations by ASNT SNT-TC-1A certified technicians, data checked against history, and a digital report by circuit and CML. We are not an Authorized Inspection Agency and we do not supply API-certified inspectors.

Many Louisiana plants already have AIs on staff or through an inspection agency. What they often lack during peak season is NDE capacity with clean documentation. That is our role:

1. Plan in. The AI provides circuits, isometrics with CMLs, the methods required and damage mechanisms of concern.
2. Procedures. An ASNT NDT Level III prepares or reviews each technique against the owner's specification and the code.
3. Fieldwork. Crews mobilise to your site; the schedule is agreed during scoping around permits, unit status, weather and access.
4. QA before demobilising. Readings are compared with the previous survey; implausible changes and inaccessible CMLs are flagged and re-shot or explained.
5. Report. CML-level readings, C-scans, RT images, guided-wave screening with follow-up results, calibration and instrument records and technician certificates, in our digital reporting platform.
6. AI sign-off. The AI evaluates rates, remaining life and next dates, accepts the data and signs.

If the owner's engineers run RBI, or a thinned line needs a fitness-for-service assessment, our data feeds that work; the assessment itself is performed by the owner's engineers or a specialist. More at API 570 piping NDE support and piping circuit and CML inspection.

Louisiana regulations that sit on top of API 570

Direct answer: Louisiana has no state statute setting process-piping inspection intervals. OSHA PSM, 29 CFR 1910.119(j), with API 570 as RAGAGEP, governs covered processes. At the fence line the Office of Conservation's Pipeline Division regulates intrastate pipelines for PHMSA, and LDEQ handles environmental and radiation rules.

OSHA PSM. Louisiana is under federal OSHA. The PSM mechanical integrity element covers piping systems, valves and relief and vent systems, and requires written procedures, inspection and testing that follow RAGAGEP, frequencies consistent with good engineering practice and operating experience, documentation of each inspection (date, inspector, equipment identifier, description, results) and correction of deficiencies. Once a plant adopts API 570, auditors read its "shall" provisions as requirements.

Chemical accident prevention. Louisiana DEQ runs the Chemical Accident Prevention Program under LAC 33:III Chapter 59, which adopts the federal Risk Management Program rule (40 CFR Part 68) by reference, including its mechanical-integrity element for Program 3 processes, and LDEQ staff audit facilities against it.

Office of Conservation, Pipeline Division. The Pipeline Division enforces federal and state pipeline-safety rules on intrastate gas and hazardous-liquid pipelines under PHMSA certification. The Office of Conservation sat within the Department of Energy and Natural Resources, which became the Department of Conservation and Energy on 1 October 2025; confirm current contact details. 49 CFR Part 195 excludes in-plant piping at refining, manufacturing and storage facilities and certain terminal transfer piping, and Part 192 applies to gas transmission and regulated gathering. In practice a pig launcher on the plant side of a meter station can be API 570 piping while the line beyond it is a regulated pipeline. We follow the operator's documented boundary and keep datasets separate; pipeline-side NDE is on our pipeline inspection page.

Boilers and the Fire Marshal. The Office of State Fire Marshal administers Louisiana's boiler and pressure-vessel programme; it does not set process-piping intervals, although boiler external piping is part of boiler inspections.

Planning around turnarounds, hurricanes and river logistics

Direct answer: Move as much CML, mapping and screening work as possible on-stream ahead of turnarounds, plan field windows around the June-to-November hurricane season, and budget for post-storm external surveys. Wet ground and high water also govern when excavations for soil-to-air and buried piping can happen.

• Ahead of the outage: on-stream UT at due CMLs, injection-point mapping and guided-wave screening, so replacement spools and repair procedures are ready.
• During the outage: insulation removal and UT prove-up of CUI findings, PT on stainless lines, examination of repair and new welds.
• After storms: external VT of racks, supports and insulation; UT where flooded insulation was found; screening of soil-to-air points disturbed by flooding.
• Excavations: scheduled in drier months where possible, with dewatering and shoring planned by the owner.

River-corridor plants share contractors during spring and autumn turnarounds, so early scoping matters. Our quote turns round within 24 hours once we have the circuit list; mobilisation is agreed during scoping.

API 570 piping inspection support across Louisiana

Direct answer: Atlantis supports API 570 programmes throughout Louisiana, with city pages for Baton Rouge, New Orleans and Lake Charles. Crews are mobilised to your site; the schedule is agreed during scoping.

• Baton Rouge and the upper river: piping inspection in Baton Rouge, corrosion inspection, weld inspection and third-party inspection.
• New Orleans and the lower river: piping inspection in New Orleans, corrosion inspection and weld inspection.
• Lake Charles and Cameron Parish: third-party inspection in Lake Charles for refinery, petrochemical and LNG piping.
• Terminals and tank farms: transfer piping often sits beside tankage covered by API 653 tank inspection in Baton Rouge.

Sibling hubs for the state: API 510 pressure vessel inspection in Louisiana, API 653 tank inspection in Louisiana and NDT inspection services in Louisiana. For NDE skills, see ASNT NDT training in Louisiana.

Keeping piping data usable

Direct answer: Rates are only as good as CML consistency. We keep your circuit and CML numbering, record the reading pattern, instrument and calibration per CML, and deliver data that loads into your inspection database, with optional digital twin and ERP views.

Louisiana plants that changed hands, merged units or lost records after storms often carry piping histories with renamed CMLs or missing isometrics. We flag mismatches rather than guess, note CMLs moved by repairs, and photograph each excavation and stripped location. Results can be shown in a digital twin of the unit, and certificates, calibrations and work orders can be managed in our inspection-management ERP. Report layouts are on NDT report templates; for construction-code context see ASME B31.3 explained.

What to send us for a Louisiana quote

Direct answer: Send circuits and isometrics with CMLs, the last API 570 report, the AI's plan, access and excavation details, and dates. We reply with questions or a scope, and a quote within 24 hours of having what we need.

1. Circuit list with line numbers, service class, material, size, schedule and operating conditions.
2. Isometrics marked with CMLs, injection points, deadlegs, soil-to-air points and buried sections.
3. Last API 570 report and thickness history.
4. The AI's inspection plan and damage mechanisms of concern (CUI, soil corrosion, wet H2S, chloride cracking, ammonia, caustic).
5. Access: rack heights, scaffold, insulation removal, excavation and dewatering status, surface temperatures.
6. Dates, turnaround windows and site requirements (TWIC, site orientation, H2S training).

Send us your circuit list for a scope and quote.

Frequently asked questions: API 570 in Louisiana

Who performs API 570 piping inspection in Louisiana?

The inspection is directed and signed by an API 570 Authorized Piping Inspector working for the owner or an inspection agency. NDE is performed by qualified examiners. Atlantis performs the NDE and delivers the data to your AI, who remains inspector of record.

Is API 570 required by Louisiana law?

No state statute names it. For PSM-covered processes, 29 CFR 1910.119(j) requires piping inspection following RAGAGEP, and API 570 is what most Louisiana owners adopt; the state's accident-prevention programme mirrors that. Intrastate pipelines beyond the plant boundary fall under the Office of Conservation's Pipeline Division instead.

How often must piping be inspected under API 570?

Thickness at the shorter of half the remaining life or the class maximum, external visual by class, unless a qualifying RBI programme sets intervals. The 1998 edition gave five years for Class 1; confirm current fifth-edition values with your AI.

How do you inspect soil-to-air interfaces and buried process piping?

By excavation with VT and UT at the most susceptible points, guided-wave screening along buried or sleeved sections with UT follow-up, and support for the owner's cathodic-protection data review. In-line inspection pigs are a specialist pipeline service we do not offer.

Can you find CUI without stripping all the insulation?

Screening methods such as profile RT and guided-wave testing narrow the search, and UT at inspection ports adds readings. Confirming and measuring CUI usually still requires targeted insulation removal and UT, which the AI scopes by class and history.

Is Atlantis an Authorized Inspector or inspection agency?

No. We are not an Authorized Inspection Agency and we do not supply API-certified inspectors. Your AI keeps evaluation and sign-off; we provide independent, documented NDE.

Can piping be inspected while the unit is running?

Yes, most thickness, mapping, screening and RT work is done on-stream. Hot lines need high-temperature probes and couplant, planned during scoping.

What NDE do you use on stainless LNG piping?

PT after insulation removal for chloride cracking, UT and PAUT adapted for austenitic welds, profile RT and VT of vapour barriers and jacketing. Cold lines may require warm-up or special procedures, agreed with the owner.

What certifications do your technicians hold?

ASNT SNT-TC-1A certification under our written practice, with ASNT NDT Level III oversight. Certificates go with every report.

Do you offer RBI, FFS or API 570 training?

No. RBI and fitness-for-service are performed by the owner's engineers or specialists using our data, and we train only to ASNT SNT-TC-1A. For the API route see the API inspector career guide.

Can you mobilise after a hurricane?

Yes, post-storm external surveys are a common request. We quote within 24 hours and agree mobilisation during scoping, subject to site access and safety clearance.

Next step

For CMLs coming due, CUI campaigns or post-storm surveys, get a quote within 24 hours or book a scoping call. Atlantis performs the NDE; your API 570 Authorized Inspector remains inspector of record and signs the inspection report.

More Atlantis NDT services in Louisiana

• NDT training and certification in Louisiana
• Level III consulting in Louisiana
• NDT inspection services in Louisiana
• API 653 storage tank inspection support in Louisiana
• API 510 pressure vessel inspection support in Louisiana
• NDT ERP software in Louisiana
• Practical NDT simulator in Louisiana

Part of the wider piping circuit inspection service at Atlantis NDT.