API 653 Tank Inspection Support in Saskatchewan

Short answer: In Saskatchewan, API 653 is the standard owners use for in-service field-erected steel tanks, and the owner's API 653 Authorized Inspector evaluates and signs the inspection. Upstream oil and gas storage falls under the Ministry of Energy and Resources' Directive S-01, which requires existing tanks to be inspected every five years for mechanical integrity, refineries sit with the Ministry of Environment, and pipeline tanks follow provincial or federal pipeline regulators. Atlantis performs the NDE and reports to your inspector.

Saskatchewan is Canada's second-largest oil-producing province, and nearly all of that production passes through storage at some point: tanks at thousands of single-well and multi-well batteries, at heavy-oil treaters and the upgrader at Lloydminster, at crude rail and pipeline terminals, and at the large refinery in Regina. Add potash and fertilizer plants, uranium mills in the north, canola crushers and ethanol plants across the farm belt, and the province holds a broad and varied tank population spread over long distances. This page explains where those tanks are, what API 653 and Directive S-01 ask, which other provincial and federal rules apply, how examiner certification is handled, and what Atlantis does. Atlantis performs the NDE; your API 653 Authorized Inspector remains inspector of record and signs the inspection report. To begin, send us your Saskatchewan tank list.

Where API 653 tanks are in Saskatchewan

Direct answer: Saskatchewan's field-erected steel tanks are concentrated at the Regina refinery complex, at the Lloydminster upgrader and heavy-oil facilities, at pipeline terminals along the Enbridge mainline including Regina and Kerrobert, at crude-by-rail and truck terminals in the south-east Bakken and the west-central heavy-oil belt, at upstream batteries province-wide, and at potash, fertilizer, uranium and agri-processing plants.

Regina

The Co-op Refinery Complex in Regina, owned by Federated Co-operatives, is one of the larger refineries in Western Canada. Its tank farm holds crude, intermediates, gasoline, diesel and asphalt, along with water and chemical tanks. Pipeline terminal tankage nearby serves the Enbridge mainline, and Regina's industrial parks add fuel distribution and chemical storage. Large refinery tanks with long service histories and many modifications mean floor condition, annular-plate thickness and the quality of past records drive the inspection scope.

Lloydminster and the heavy-oil belt

Lloydminster straddles the Alberta border. On the Saskatchewan side, Cenovus operates a heavy-oil upgrader, and the surrounding region, from Lloydminster south toward Kindersley and Kerrobert, is dense with heavy-oil batteries, treaters, sand-handling facilities and blending terminals. Heavy oil is stored hot, often in insulated tanks, and produced sand and water settle on tank floors, which drives floor corrosion and makes cleaning a large part of every internal inspection.

Kerrobert and the pipeline corridor

Kerrobert in west-central Saskatchewan hosts pipeline terminal tankage on the Enbridge mainline, and other interprovincial lines, including the Keystone system, cross the province. Terminal and breakout tanks along these routes are large, tied to pipeline schedules and governed by the pipeline operator's management system.

Estevan, Weyburn and the south-east Bakken

South-east Saskatchewan produces light oil from the Bakken and older Mississippian plays around Estevan, Weyburn and Carlyle. Batteries, crude-by-rail loading terminals and truck terminals store large volumes of light crude and produced water. Carbon dioxide enhanced oil recovery at Weyburn-Midale brings CO2-rich produced fluids, which matter for corrosion in tanks and piping.

Saskatoon, potash country and the north

Around Saskatoon and Belle Plaine, potash mines and refineries store fuel, brine, reagents and process water, and nitrogen fertilizer production at Belle Plaine adds chemical storage. In the north, uranium mills store sulphuric acid, reagents and process solutions. Canola crushing plants and ethanol plants across the farm belt store vegetable oil, solvents and fuel ethanol. Moose Jaw hosts an asphalt refinery with heated tanks.

What the mix means for inspection

Most upstream tanks are shop-built or API 12-series tanks rather than API 650 field-erected tanks, so the first question for each tank is how it was built. API 653 is written for tanks built to API 650 or API 12C, and owners apply it, or adapt it, to other welded steel tanks through their integrity program. The refinery, upgrader and terminal tanks are classic API 653 territory.

What API 653 requires, in plain terms

Direct answer: API 653 governs inspection, repair, alteration and reconstruction of in-service atmospheric steel tanks built to API 650 or API 12C. Owners check tanks routinely, an Authorized Inspector performs a formal external inspection at least every five years, shell UT follows a corrosion-based interval, and internal inspections are timed by measured floor corrosion and the tank's safeguards.

Routine in-service checks. Owner personnel inspect each tank at least monthly for leaks, shell distortion, settlement, roof and seal condition and foundation damage. Directive S-01 sets its own monthly visual inspection requirement for upstream sites, so the two programs can share the same rounds and records.

External inspection. An Authorized Inspector performs a formal external inspection at least every five years, or sooner where shell corrosion is rapid, because API 653 also limits the interval to a quarter of the remaining shell corrosion life.

Shell UT thickness. Where UT readings are used, they are due within five years of commissioning while the corrosion rate is unknown, and after that at the lesser of half the remaining shell corrosion life or fifteen years.

Internal inspection. A new tank's first internal inspection is generally due within ten years, extendable within API 653's ceilings by crediting safeguards such as release prevention barriers, linings and cathodic protection. Later intervals come from measured floor corrosion and minimum remaining bottom thickness, or from a qualifying risk-based assessment carried out by the owner's specialists.

Cold and the current edition. Saskatchewan winters regularly reach minus forty, which bears on the inspector's brittle-fracture screening before repairs, alterations or a change of service. API 653 is in its fifth edition with addenda; Addendum 4 (July 2025) revised the text on tank-bottom thickness measurement, so check procedures against the current edition from api.org. See API 653 tank inspection intervals explained and the API 653 tank inspection guide.

Saskatchewan regulations that sit on top of API 653

Direct answer: Upstream oil and gas storage falls under Directive S-01, the Ministry of Energy and Resources' storage standards, which require existing tanks to be inspected every five years for mechanical integrity. Refineries and other hazardous-substance storage sit with the Ministry of Environment, pipelines with the Ministry of Energy and Resources or the Canada Energy Regulator, and pressure equipment with TSASK. Federal tank rules apply on federal and First Nations land.

Directive S-01: upstream storage

Directive S-01, Saskatchewan Upstream Petroleum Industry Storage Standards (Revision 2.1), is issued under The Oil and Gas Conservation Act and The Oil and Gas Conservation Regulations, 2012. It applies to upstream petroleum sites and facilities, including batteries, gas processing plants, wells, custom treating facilities, transfer and metering stations, injection facilities and waste processing facilities. It does not apply to petrochemical refineries, which sit with the Ministry of Environment, or to pipelines and pipeline facilities licensed under The Pipelines Act, 1998, or to CER-regulated pipeline storage. Its key tank provisions, in summary:

• Acceptable tanks. New welded steel tanks must be built to API 12D, 12F, 620 or 650. Used or reconditioned welded steel tanks are acceptable only if inspected by a suitably qualified and trained person, inspected to applicable API standards, and repaired, altered or reconstructed to applicable API standards.
• Five-yearly inspection of existing tanks. Tanks installed before 1 April 2002 that do not meet the directive's standards must be inspected every five years to verify mechanical integrity, and since 1 April 2012 any tank ten years old or older is treated as an existing storage tank subject to the same five-year inspection. The directive phased in the program at a minimum of twenty percent of the tank population each year.
• How to inspect. Operators may inspect to applicable API standards or design their own mechanical integrity testing program; the inspection should be completed by a properly certified tank inspector, and the integrity report must be kept for the life of the tank. Alternative test methods or schedules need the ministry's written permission first.
• Monthly checks and containment. Monthly visual inspection of tanks and storage areas, documented on an inspection sheet, and secondary containment for aboveground tanks of 5 cubic metres or more.
• Failures. A tank that fails its integrity test or leaks must be repaired and retested, or replaced, with spills of reportable quantity reported under the ministry's incident reporting directive.

Because the directive accepts API standards as the inspection basis and asks for a certified tank inspector, an API 653 inspection with NDE data is the most common way upstream operators satisfy it. Confirm the current revision and your obligations with the Ministry of Energy and Resources.

Ministry of Environment: refineries and hazardous substances

The Ministry of Environment administers The Hazardous Substances and Waste Dangerous Goods Regulations under The Environmental Management and Protection Act, 2010, which set requirements for storing, handling, transferring and decommissioning hazardous substances, including petroleum products. Construction, alteration or expansion of a storage facility needs ministry approval, and storage facilities need operating approvals. The refinery in Regina, chemical plants and fuel distributors sit under this regime, along with the National Fire Code as adopted in Saskatchewan and enforced by local fire authorities. Confirm current requirements with the ministry.

Pipelines: provincial and federal

Pipelines licensed under The Pipelines Act, 1998 are regulated by the Ministry of Energy and Resources. Interprovincial and international systems, including the Enbridge mainline and Keystone, are regulated by the Canada Energy Regulator, and their terminal and breakout tanks at Regina, Kerrobert and elsewhere sit within the operator's CER-regulated management system, with CSA Z662 as the pipeline standard. See our CSA Z662 overview.

Federal tank rules and First Nations land

The federal Storage Tank Systems for Petroleum Products and Allied Petroleum Products Regulations (SOR/2008-197) apply on federal land and Indigenous land and to systems serving federal works and undertakings such as airports and railways. Saskatchewan has many First Nations, and fuel storage on reserve land can fall under these rules. For older vertical aboveground tanks without secondary containment they require continuous leak detection or monitoring, or a tank or floor inspection every ten years, with tank inspections following the API 653 version in effect. Confirm with Environment and Climate Change Canada.

TSASK and radiography

The Technical Safety Authority of Saskatchewan regulates boilers and pressure vessels. Pressurised storage such as propane and NGL bullets is pressure equipment under TSASK and API 510, not API 653; see our TSASK overview. Industrial radiography is licensed federally by the Canadian Nuclear Safety Commission, which in Saskatchewan also regulates the uranium mines and mills, and exposure devices are operated by CNSC-certified operators. Atlantis uses only crews holding the required licence and certifications; see our CNSC overview.

NDE examiner qualifications in Saskatchewan

Direct answer: Directive S-01 asks for a properly certified tank inspector but does not name an NDE certification scheme, so the owner's specification decides. Saskatchewan owners commonly accept ASNT SNT-TC-1A or CAN/CGSB-48.9712 (ISO 9712). Atlantis technicians are certified to an ASNT SNT-TC-1A written practice under ASNT Level III oversight; we confirm acceptance during scoping.

CAN/CGSB-48.9712, aligned with ISO 9712, is Canada's national NDT personnel certification scheme and is administered by Natural Resources Canada's NDT Certification Body. The Canadian General Standards Board, which published it, closed on 1 April 2026; NRCan's certification body continues and CAN/CGSB-48.9712 remains valid, according to NRCan and CWB Group notices. Confirm the current certification body when you update your specifications. See CAN/CGSB-48.9712 and the NRCan NDT Certification Body.

Two different roles are easy to blur under Directive S-01. The certified tank inspector, typically an API 653 Authorized Inspector, evaluates the tank's mechanical integrity and signs the report. The NDE technicians produce the floor, shell and weld data that evaluation rests on. Atlantis fills the second role only. Our technicians are certified to an SNT-TC-1A written practice and our procedures are reviewed by an ASNT NDT Level III; each proposal names the certification basis method by method so your inspector can accept it before mobilisation. Atlantis does not provide CGSB or ISO 9712 training or certification; our training is ASNT SNT-TC-1A only, through NDT training in Saskatchewan and across Canada.

NDE methods for API 653 work in Saskatchewan

Direct answer: Saskatchewan tank work relies on floor MFL scanning proved up with UT, shell UT thickness surveys with cold-weather procedures, corrosion mapping on heated and insulated heavy-oil tanks, visual examination of roofs, foundations and containment, MT, PT and vacuum-box testing after repairs, PAUT or radiography of new welds, and settlement data for the inspector.

Every reportable MFL indication is proved up with UT, and every procedure is reviewed by an ASNT NDT Level III. Cold-weather UT needs low-temperature couplant, temperature-corrected readings and equipment that copes with moving between heated hoarding and cold steel. For floor-method trade-offs see MFL versus UT for tank floors; for the full scope see aboveground storage tank inspection.

How Atlantis supports your Authorized Inspector

Direct answer: Atlantis takes the scope from your API 653 inspector's plan, performs the NDE, checks the data before leaving site and delivers a digital report your inspector can review, accept and sign, including for Directive S-01 integrity inspections. We are not an Authorized Inspection Agency and we do not supply API-certified inspectors. Our job is the examinations and the data.

1. Scope from the inspector's plan: floor coverage, shell and annular locations, roof, foundation and containment examinations, weld examinations and settlement points, grouped by site to cut travel across a spread-out battery portfolio.
2. Certification check: we confirm the examiner certifications your specification requires before booking a crew.
3. Procedure review by an ASNT NDT Level III, including cold-weather UT and temperature correction.
4. Examinations by technicians certified to an SNT-TC-1A written practice: MFL with UT prove-up, shell and annular UT, corrosion mapping, visual, surface and volumetric methods.
5. Data QA on site: readings checked against calibration records and the previous inspection, with anomalies flagged to the inspector the same day.
6. Digital report in our reporting platform: floor maps, prove-up readings, shell readings by course and location, weld records, photographs, calibration data and technician certification records, on report templates matched to your inspector's file and easy to keep for the life of the tank, as S-01 expects.
7. Inspector evaluation and sign-off, then reuse of the same locations at the next five-year cycle, tracked in our inspection-management ERP or visualised on a digital twin.

We can calculate corrosion rates and remaining life from our thickness data for the inspector's review; the interval decision belongs to the inspector and the owner under API 653, Directive S-01 and the rules that apply. 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, or read about API 653 tank inspection support.

Planning around winter, road bans and turnarounds

Direct answer: Saskatchewan internal inspections, floor scans and repairs are usually planned for late spring to early autumn, around refinery and upgrader turnarounds and pipeline rotation. Winter work is limited mainly to external UT, mapping and visual inspection under cold-weather procedures. Spring road restrictions and long distances make grouping sites into campaigns worthwhile.

Winter. Metal temperatures of minus thirty to minus forty affect UT accuracy, couplants, batteries and technician safety, and they matter to the inspector's brittle-fracture assessment for repairs. External surveys in winter need heated hoarding, warm-up shelters and shorter work periods, and blowing snow can close rural roads at short notice.

Spring road restrictions. Seasonal weight restrictions on provincial highways and rural roads during the thaw limit heavy equipment movement, affecting vacuum trucks, cleaning equipment, cranes and repair crews. Plan cleaning and repairs around them so the NDE crew is not left waiting.

Campaigns across a portfolio. Directive S-01's five-year cycle encourages operators to inspect a share of their tank population every year. Grouping batteries by area, for example a south-east Bakken campaign or a heavy-oil campaign around Lloydminster and Kindersley, cuts travel and keeps cleaning, NDE and the inspector moving together.

Turnarounds and rotation. The Regina refinery and the Lloydminster upgrader schedule turnarounds in the warmer months, and pipeline terminals at Regina and Kerrobert rotate tanks around nominations. Confined-space entry follows Saskatchewan's occupational health and safety regulations and site permits. Book a scoping call for your next campaign.

API 653 inspection support across Saskatchewan

Direct answer: Atlantis mobilises crews to tank sites throughout Saskatchewan on a schedule agreed during scoping, covering Regina and Moose Jaw, Saskatoon and potash country, Lloydminster, Kindersley and Kerrobert, Estevan, Weyburn and the south-east, Swift Current and the south-west, and northern mine sites.

• Regina: refinery, pipeline terminal and distribution tanks. Related pages: digital twins in Regina, NDT ERP in Regina and practical NDT in Regina.
• Saskatoon and potash country: mine, fertilizer, chemical and agri-processing tanks. See digital twins in Saskatoon, NDT ERP in Saskatoon and practical NDT in Saskatoon.
• Lloydminster and the heavy-oil belt: upgrader, treater, battery and blending tanks. See digital twins in Lloydminster and NDT ERP in Lloydminster.
• Kerrobert and Kindersley: pipeline terminal and heavy-oil storage.
• Estevan, Weyburn and Carlyle: Bakken and Mississippian batteries, CO2 EOR facilities and crude rail terminals.
• Moose Jaw and Swift Current: asphalt refinery tanks and south-west battery storage.
• The north: acid, reagent and fuel tanks at uranium mills, planned around fly-in or winter-road access and site rules.

Pressure vessels and process piping at the same sites follow their own codes and TSASK's program; see our companion hubs for API 510 pressure vessel inspection in Saskatchewan and API 570 piping inspection in Saskatchewan. For Level III procedure and written-practice support see NDT consulting in Saskatchewan and NDT consulting across Canada; for inspection data management see NDT ERP in Saskatchewan.

What to send us for a quote

Direct answer: Send your tank list with construction standards and ages, the last integrity or API 653 reports, your inspector's plan and examiner-certification requirements, cleaning and access status, and your season window. We return a scoped NDE quote within 24 hours.

1. Tank list: site and tank IDs, legal land locations for upstream sites, diameter, height, roof type, product and temperature, year built, construction standard (API 650, 12C, 12D, 12F, 620 or other), plate thicknesses, insulation, floor type, cathodic protection and containment.
2. Regulatory context: whether each site falls under Directive S-01, Ministry of Environment approvals, a provincial or CER-regulated pipeline, or federal tank rules, and when each tank's five-year inspection is due.
3. Previous reports: integrity reports, API 653 reports, floor maps, shell readings and settlement surveys.
4. The inspector's plan: examinations, coverage, acceptance references, report format and required examiner certifications, with your Authorized Inspector's name or agency.
5. Access and logistics: in service or cleaned and gas-free, sand and sludge removal, hoarding and heating, lease-road conditions, accommodation, orientation and permits.
6. Dates: turnaround, rotation or campaign windows and road-restriction constraints.

Get a quote within 24 hours.

Frequently asked questions: API 653 tank inspection in Saskatchewan

Does Saskatchewan require tank inspections every five years?

For upstream oil and gas storage, yes. Directive S-01 requires existing aboveground storage tanks, which since 1 April 2012 includes any tank ten years old or older, to be inspected every five years to verify mechanical integrity, either to applicable API standards or to an approved alternative program. Confirm your obligations with the Ministry of Energy and Resources.

Does Directive S-01 apply to the Regina refinery or pipeline terminals?

No. The directive excludes petrochemical refineries, which sit with the Ministry of Environment, and pipelines and pipeline facilities licensed under The Pipelines Act, 1998, as well as CER-regulated pipeline storage. Those tanks follow their own regulators and the owner's API 653 program.

Who can perform an API 653 inspection in Saskatchewan?

An API 653 Authorized Inspector engaged by the owner, directly or through an inspection agency, evaluates the tank and signs the report. Qualified NDE technicians collect the data. Atlantis performs that NDE with ASNT-certified technicians under Level III oversight and delivers the results to your inspector.

Is Atlantis a certified tank inspector under Directive S-01?

No. We are not an Authorized Inspection Agency and we do not supply API-certified inspectors. We provide the NDE data that your certified tank inspector uses to evaluate and sign off mechanical integrity.

Can a used tank be moved to a new Saskatchewan battery?

Under Directive S-01, a reconditioned or used welded steel tank is acceptable only if inspected by a qualified person to applicable API standards and repaired as those standards require. Atlantis can provide the floor, shell and weld NDE for the inspector's evaluation.

Are your technicians CGSB certified?

No. Atlantis technicians are certified to an ASNT SNT-TC-1A written practice under ASNT Level III oversight. The owner's specification decides which scheme is acceptable, and we confirm it during scoping. CAN/CGSB-48.9712 remains valid after the Canadian General Standards Board's closure on 1 April 2026; confirm the current certification body.

How often does a tank need an API 653 inspection?

Monthly owner checks, an external inspection at least every five years, shell UT on a corrosion-based interval, and an internal inspection first due within ten years, then on a calculated interval within the code's ceilings. Directive S-01's five-year cycle runs alongside for upstream tanks.

Can you inspect tanks in a Saskatchewan winter?

External shell UT, corrosion mapping and visual work can be done in winter with cold-weather procedures and heated hoarding. Internal inspections, floor scanning and repairs are usually planned for the warmer months.

Do federal rules apply to tanks on First Nations land?

They can. The federal storage tank regulations apply on Indigenous land and federal land, and require older vertical tanks without secondary containment to have continuous leak monitoring or a tank or floor inspection every ten years, following API 653.

Who licenses radiography of tank repair welds?

The Canadian Nuclear Safety Commission licenses industrial radiography federally, and exposure devices are operated by CNSC-certified operators. Work is performed only by crews holding the required licence.

Do you do RBI, fitness-for-service or API 653 training?

No. RBI and fitness-for-service assessments are performed by the owner's engineers or specialists using our data. Atlantis offers ASNT SNT-TC-1A NDT training only; for the API certification route see our API inspector career guide.

How soon can a crew reach Regina, Lloydminster or Estevan?

Crews are mobilised to your sites on a schedule agreed during scoping, built around cleaning, turnaround, road and weather constraints. Send tank details and we return a quote within 24 hours.

Plan your Saskatchewan tank inspections

From a five-year S-01 integrity campaign across south-east batteries to a floor scan on a Regina refinery tank, start with your inspector's plan, your certification requirements and a realistic season window. Send us your tank list, see what an API 653 program involves, or explore practical NDT in Saskatchewan for technician development.

More Atlantis NDT services in Saskatchewan

• NDT training and certification in Saskatchewan
• Level III consulting in Saskatchewan
• API 510 pressure vessel inspection support in Saskatchewan
• API 570 piping inspection support in Saskatchewan
• NDT ERP software in Saskatchewan
• Practical NDT simulator in Saskatchewan

Part of the wider aboveground storage tank inspection service at Atlantis NDT.