NDT Inspection Services in California

Short answer: Atlantis NDT provides non-destructive testing inspection throughout California: UT thickness and corrosion mapping, PAUT and TOFD weld inspection, radiography through radiography crews licensed in California, MT, PT, VT and ET, and NDE support for API 510 pressure vessel, API 570 piping and API 653 storage tank programmes. Work is performed by ASNT-certified technicians under ASNT NDT Level III oversight, crews are mobilised to your site, and every job ends in a code-referenced digital report your inspector of record can use.

California inspection is shaped by regulation more than in any other state. Refineries operate under Cal/OSHA's refinery-specific process safety rule, many pressure vessels need a state permit to operate, radiographers need California-recognised certification, and seismic design and environmental rules sit on top of everything. The industrial base is just as distinctive: refineries in the Los Angeles basin and the San Francisco Bay Area, oilfields in Kern County, the twin ports of Los Angeles and Long Beach, aerospace and space launch from Palmdale to Vandenberg, naval shipbuilding in San Diego, and power generation including the Diablo Canyon nuclear plant. This page covers each of those, the rules that change inspection scope, and how Atlantis delivers. To start, request a California inspection quote.

Where inspection work is in California

Direct answer: California inspection demand concentrates in the Los Angeles basin refineries and ports, the San Francisco Bay Area refining and industrial belt from Richmond to Benicia, the Kern County oilfields around Bakersfield, the Southern California aerospace and space corridor, San Diego's naval and shipbuilding base, and statewide power, water and transport infrastructure.

Los Angeles basin: El Segundo, Carson, Wilmington, Torrance and Long Beach

The South Bay and harbour area holds most of Southern California's refining capacity, including Chevron's El Segundo refinery, the Marathon Los Angeles refinery spanning Carson and Wilmington, and the Torrance refinery, along with marine terminals, tank farms, pipelines and the Port of Los Angeles and Port of Long Beach, the busiest container port complex in the country. Typical scope is UT thickness on piping circuits and vessels, PAUT and RT on repair welds, CUI work on insulated lines, API 653 work on terminal tanks and inspection of marine-terminal piping and structures. Several California refineries have closed or converted to renewable fuels in recent years, so local scope keeps shifting from crude units to conversion projects and tank and terminal integrity. See Los Angeles third-party inspection, El Segundo, Carson, Wilmington and Torrance.

Bay Area: Richmond, Martinez, Benicia and the Carquinez Strait

Chevron's Richmond refinery and the refineries and terminals around Martinez and Benicia make the Carquinez Strait the second refining cluster in the state, alongside chemical plants, power stations and the Port of Oakland. Some Bay Area sites have converted to renewable diesel, which brings new-construction weld inspection on modified units as well as continued integrity work. Bay Area refineries were among the first to work under the refinery PSM rule's damage mechanism review requirements, which tend to generate targeted inspection scopes for specific mechanisms such as sulfidation and high-temperature hydrogen attack. See Richmond refining NDT consulting, Martinez, Benicia and San Francisco tank inspection.

Kern County and the San Joaquin Valley

Bakersfield sits among California's largest oilfields, including Kern River and Midway-Sunset, where steam-flood operations put steam generators, high-temperature piping, separators and produced-water tanks under constant thermal and corrosive load. Inspection here means UT thickness on steam and production lines, tank inspection at lease facilities, weld inspection on gathering lines and vessel surveys. Agriculture and food processing across the valley add pressure vessels, ammonia refrigeration piping and boilers. See Bakersfield third-party inspection, Bakersfield refining NDT consulting and Taft.

Aerospace and space: Palmdale, Edwards, Hawthorne and Vandenberg

Southern California designs and builds aircraft and spacecraft at Air Force Plant 42 in Palmdale, flight-tests at Edwards Air Force Base, builds rockets in Hawthorne and launches from Vandenberg Space Force Base. Aerospace NDE is governed by prime-contractor specifications and NAS 410 personnel rules, so Atlantis's role there is usually support to suppliers' own programmes and Level III consulting rather than field crews; see NDT consulting in California.

San Diego: shipbuilding and the Navy

San Diego hosts one of the largest naval concentrations in the country and the General Dynamics NASSCO shipyard, plus ship-repair yards around the bay. Weld inspection to NAVSEA and ABS requirements, UT and MT on structural and hull welds, and RT on piping are the core methods. See San Diego weld inspection, maritime NDT consulting in San Diego and radiographic testing in San Diego.

Power, water and infrastructure

The Diablo Canyon nuclear plant near San Luis Obispo, gas-fired plants and a growing fleet of battery storage and hydrogen projects drive power-sector NDE. Statewide water conveyance, Caltrans bridges, high-speed rail and seismic retrofit projects add structural weld inspection to AWS D1.1 and D1.5. See power NDT consulting in Long Beach and Sacramento.

NDT methods we deliver in California

Direct answer: Atlantis delivers UT thickness and corrosion mapping, PAUT, TOFD, conventional UT, radiography through California-licensed radiography crews, MT, PT, VT and ET. The table maps each method to typical California work and the code usually cited. Technique selection is agreed with your inspector of record and, for refineries, your damage mechanism review.

All procedures are reviewed by an ASNT NDT Level III and technicians are certified under an SNT-TC-1A written practice. Where a refinery requires performance demonstration or its own procedures, we work to them. City detail: Los Angeles piping inspection, San Francisco corrosion inspection, ultrasonic testing in Los Angeles and ultrasonic testing in San Francisco.

API 510, 570 and 653 inspection support in California

Direct answer: Atlantis performs the NDE that API 510, API 570 and API 653 inspections in California depend on, including CML thickness surveys, weld examination, tank floor and shell work and external visual, and hands documented results to your API-certified Authorized Inspector, who remains inspector of record. Where a vessel also needs a Cal/OSHA permit inspection, our data supports the permit inspector.

API 510 pressure vessels. Hydroprocessing reactors, fractionators, drums and exchangers in California refineries see damage mechanisms that the refinery PSM rule requires sites to review formally. We carry out external visual, UT thickness at CMLs, PAUT or TOFD where cracking mechanisms are suspected, and MT or PT on internals during entries, all reported against prior surveys. See API 510 pressure vessel inspection support, Los Angeles pressure vessel inspection and San Francisco pressure vessel inspection.

API 570 piping. We survey CMLs to your isometrics, add scanning at injection points, mix points and deadlegs, and support CUI screening, which is a persistent issue on coastal units exposed to marine fog. Results arrive per CML for upload to your inspection database. See API 570 piping inspection support and San Diego piping inspection.

API 653 storage tanks. Terminal and refinery tanks in California also face seismic anchorage and foundation questions. For out-of-service inspections we perform floor scanning with UT follow-up, shell thickness, shell-to-bottom and repair weld examination and nozzle work; for externals, shell thickness, visual examination of roof, shell, foundation and appurtenances, and settlement measurement presented against API 653 Annex B. See API 653 tank inspection support, Los Angeles tank inspection and San Francisco tank inspection.

Atlantis does not sell risk-based inspection (API 580/581) or fitness-for-service (API 579) assessments; our reports supply the data your engineers use for those decisions.

Turnarounds, shutdowns and planned inspection

Direct answer: California refinery turnarounds are planned long in advance and closely watched because they affect state fuel supply. Atlantis joins planning early, agrees methods and procedures with your inspector, and mobilises crews on dates fixed during scoping, so inspection and repair-weld re-examination do not extend the outage.

We split a turnaround scope into on-stream work before the outage (thickness surveys, external visual, in-service weld examination), outage work (entries, tank floors, exchanger bundles, welds under insulation) and post-repair re-examination. Moving scope on-stream wherever your inspector agrees is the single biggest lever on outage length.

California-specific planning points: refineries must account for the inspection actions coming out of damage mechanism reviews and hazard analyses, which can add mechanism-specific scope late in planning; work on the Los Angeles and Bay Area coasts must deal with marine-layer humidity that affects coatings and CUI; summer heat in Kern County and the desert limits working hours; and many sites have strict air-quality permits that affect blasting, coating removal and hot work. Contractor safety prequalification and site orientation are completed before mobilisation. Plan a California turnaround inspection.

California regulations that shape inspection

Direct answer: In California, boilers and many unfired pressure vessels need permits from Cal/OSHA's Pressure Vessel Unit, refineries work under Cal/OSHA's refinery PSM rule (Title 8 section 5189.1), radiography is regulated by the California Department of Public Health Radiologic Health Branch, hazardous liquid pipelines by the Office of the State Fire Marshal, gas pipelines by the CPUC, and tanks by APSA and EPA SPCC.

Boilers and pressure vessels: Cal/OSHA Pressure Vessel Unit

California is one of the states that regulates unfired pressure vessels as well as boilers. Cal/OSHA's Pressure Vessel Unit issues permits to operate for boilers and for many unfired pressure vessels, such as air receivers and LPG tanks, under the Title 8 Boiler and Fired Pressure Vessel and Unfired Pressure Vessel Safety Orders, and permit inspections are performed by state inspectors or qualified insurance-company inspectors. Which process vessels need a permit depends on the scope and exemptions in the Safety Orders, so confirm specific items with Cal/OSHA. Atlantis is not a permit inspector; our NDE data supports yours.

Refinery process safety: Title 8 section 5189.1

California is a state-plan OSHA state. General industry follows the state PSM standard (Title 8 section 5189), and petroleum refineries follow the refinery-specific standard in section 5189.1, adopted in 2017, which adds requirements such as damage mechanism reviews, hierarchy-of-hazard-controls analyses and stronger mechanical integrity programmes. The parallel CalARP programme applies to many of the same facilities. For inspection contractors this means scopes are increasingly tied to specific damage mechanisms, and reports must show exactly which technique was used where.

Radiography: CDPH and Agreement State status

California is an NRC Agreement State. The California Department of Public Health's Radiologic Health Branch licenses radioactive material and regulates industrial radiography, including certification requirements for radiographers working in the state. Atlantis does not claim to hold a California radioactive material licence; radiography on our scopes is performed by radiography crews licensed in California, working to procedures reviewed under our Level III. In congested refineries and ports, PAUT or TOFD can be proposed instead of RT where the code and owner accept it.

Pipelines, oilfields and tanks

The Office of the State Fire Marshal's pipeline safety programme regulates intrastate hazardous liquid pipelines, the California Public Utilities Commission oversees gas pipeline safety, and PHMSA regulates interstate lines under 49 CFR Parts 192 and 195. Oil and gas production facilities are overseen by the California Geologic Energy Management Division (CalGEM). Aboveground petroleum storage falls under the Aboveground Petroleum Storage Act, administered locally by Certified Unified Program Agencies, and EPA's SPCC rule (40 CFR Part 112) expects integrity testing to a standard such as API 653 or STI SP001. See pipeline inspection services and Los Angeles pipeline inspection.

Inspection reports clients can use

Direct answer: Each California inspection is delivered as a digital report from Atlantis's own reporting platform, with every reading and indication tied to asset, location, procedure, acceptance criterion, technician certification and instrument calibration, and reviewed under ASNT Level III oversight before release.

California's refinery rule makes documentation more important than anywhere else in the country: inspection results feed damage mechanism reviews, mechanical integrity records and, after incidents, regulatory investigations. A report that cannot show which technique was used on which location, by whom, with what calibrated instrument, is a liability. Our platform captures data in the field, offline where needed, structures it per asset and CML, and exports to the formats your inspection data system imports. See NDT inspection software and best NDT reporting software 2026.

The same data can feed Atlantis ERP for scheduling, certifications and invoicing, or a 3D model of the unit on our digital twin platform; see digital twins in California. Level III-led inspection, a digital report and an optional twin from one company is something the large inspection firms do not offer as a single service.

Cities we cover across California

Direct answer: Atlantis mobilises inspection crews to client sites anywhere in California. Atlantis has no physical office in California, so crews travel to your refinery, terminal, yard or right-of-way, with dates agreed during scoping. These pages go deeper on individual California cities.

• Los Angeles and the harbour: third-party inspection, weld inspection, corrosion inspection, Long Beach, Paramount and El Segundo refining.
• Bay Area: San Francisco weld inspection, San Francisco pipeline inspection, piping inspection, Martinez refining and Fremont.
• Central Valley: Bakersfield, Sacramento and Fresno.
• San Diego: tank inspection, pressure vessel inspection and pipeline inspection.
• North Coast: Eureka.

Related California hubs: NDT consulting in California for Level III services, procedures and written practices, and NDT training in California for ASNT SNT-TC-1A-based technician training.

How to request inspection

Direct answer: Send Atlantis the asset, method, site, governing code, dates and the report you need. We reply with questions or a scoped quote, share procedures and certifications for your inspector's review, mobilise on the agreed date and deliver a Level III-reviewed digital report.

1. Describe the job. Asset, method if known, California site, governing code (API 510/570/653, ASME, API 1104, AWS D1.1/D1.5, NAVSEA or ABS), any damage mechanism the inspection targets, dates, quantities and report format. Send your California RFQ.
2. Scoping call. Technique, access, site safety, air-permit constraints and whether RT or an ultrasonic alternative fits.
3. Quote and procedures. Scope, quote, procedures and technician certifications for review.
4. Mobilisation. Orientation and crew mobilisation on the date agreed during scoping.
5. Inspection. Critical findings reported to your representative during the shift.
6. Report. Digital, code-referenced, reviewed under ASNT Level III oversight.

Frequently asked questions about NDT inspection in California

What NDT inspection services does Atlantis offer in California?

UT thickness and corrosion mapping, PAUT, TOFD, conventional UT, radiography through California-licensed crews, MT, PT, VT and ET, plus NDE support for API 510, API 570 and API 653 programmes and pipeline inspection, under ASNT Level III oversight.

Do you have an office in Los Angeles or the Bay Area?

No. Atlantis has no physical office in California; crews mobilise to your site and dates are agreed during scoping.

Do pressure vessels need a state permit in California?

Many do. Cal/OSHA's Pressure Vessel Unit issues permits to operate for boilers and many unfired pressure vessels such as air and LPG tanks. Scope and exemptions are set by the Title 8 Safety Orders, so confirm individual vessels with Cal/OSHA.

What is Cal/OSHA section 5189.1?

It is California's process safety management standard for petroleum refineries, adopted in 2017. It adds damage mechanism reviews and stronger mechanical integrity requirements, which shape what refineries ask inspection contractors to examine and document.

Who regulates industrial radiography in California?

California is an NRC Agreement State, and the CDPH Radiologic Health Branch licenses radioactive material and regulates industrial radiographers. Our radiography is done by crews licensed in California.

Can you support API 653 tank inspections at California terminals?

Yes: floor scanning with UT follow-up, shell thickness, weld examination and settlement measurement. Your API 653 Authorized Inspector remains the inspector of record.

How much does NDT inspection cost in California?

Atlantis quotes on request. Cost depends on method, quantity, access, travel, crew size, schedule, site requirements and report format. Send the scope for a written quote.

Can inspection be done while the unit is running?

Many thickness surveys, external visuals and some weld examinations can be done on-stream within temperature limits and site permits, which reduces turnaround scope.

Who regulates pipelines in California?

The Office of the State Fire Marshal regulates intrastate hazardous liquid pipelines, the CPUC regulates gas pipeline safety, and PHMSA regulates interstate lines.

Do you inspect in the Kern County oilfields?

Yes. Typical scopes are UT thickness on steam and production piping, tank inspection at lease facilities, vessel surveys and weld inspection on gathering lines.

Do you do aerospace NDT in California?

Aerospace NDE is governed by prime-contractor specifications and NAS 410. We support suppliers mainly through Level III consulting and procedures; talk to us about your programme.

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

No. Atlantis does not offer API 580/581 RBI or API 579 FFS; we provide the inspection data those assessments use.

Get a California inspection scope

A reactor weld list in El Segundo, a terminal tank in Long Beach, steam lines near Bakersfield or ship piping in San Diego: send the asset, method, code and dates. Get a quote for NDT inspection in California, or book a call with our ASNT Level III to agree the technique first. Affordable. Accessible. Fully customizable. See also all inspection services.

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