CAS/Standards
DOC REF: CAS-STD-001 · REV 01

Standards &
Our Approach

Every CAS project is executed to the applicable international code. This page explains which standards we work to, what that means in practice, and how our quality management approach protects our clients.

Technical standards
API 650
Welded Tanks for Oil Storage
The primary international standard governing the design, fabrication, erection and inspection of above-ground welded storage tanks. CAS's tank erection projects are executed in accordance with API 650 — covering shell course tolerances, weld procedures, NDE requirements, and hydrostatic testing protocols.
Applies to
Tank Fabrication Site Erection NDE Hydrostatic Testing
ASME Section IX
Welding & Brazing Qualifications
ASME Section IX governs the qualification of welding procedures and welders for pressure-retaining applications. CAS's welding teams work to ASME IX Welding Procedure Specifications (WPS) and Procedure Qualification Records (PQR). WPS/PQR alignment between fabrication and site erection is a deliberate quality control measure in our operations.
Applies to
All Welding Scopes WPS / PQR Welder Qualification
ASME Section VIII
Pressure Vessels
For pressure vessel fabrication and inspection, CAS works to ASME Section VIII Division 1 requirements — covering design pressure calculations, material selection, fabrication tolerances, weld joint efficiency, NDE and hydrostatic proof testing. Applicable to all pressure vessel supply and fabrication scopes.
Applies to
Pressure Vessels Air Receivers Process Vessels
UL 142
Steel Aboveground Tanks for Flammable Liquids
UL 142 is the Underwriters Laboratories standard for steel aboveground storage tanks storing flammable and combustible liquids. CAS procures and supplies UL 142-listed tanks for international clients — particularly for fuel storage applications in markets where UL listing is required or preferred.
Applies to
Fuel Storage Tanks Bunded Tanks International Supply
UL 58
Steel Underground Tanks for Flammable & Combustible Liquids
UL 58 is the Underwriters Laboratories standard for steel underground storage tanks for petroleum products and other flammable and combustible liquids. CAS procures and supplies UL 58-listed underground steel tanks for fuel storage applications — particularly for clients operating in markets where UL listing is mandated for underground petroleum storage.
Applies to
Underground UST Fuel Stations International Supply
UL 1316
Fibreglass Underground Tanks for Petroleum & Chemicals
UL 1316 covers glass-fibre-reinforced plastic underground storage tanks for petroleum products, alcohols and alcohol-gasoline mixtures. Fibreglass tanks offer corrosion resistance and a long service life in underground installations. CAS procures and supplies UL 1316-listed FRP underground tanks for clients in fuel retail, chemical storage and other underground containment applications.
Applies to
Fibreglass UST Chemical Storage Petrol Stations
PESO
Petroleum & Explosives Safety Organisation
PESO is the statutory authority in India for the safe storage and handling of petroleum products. All CAS fuel storage tank installations in India are designed and supplied in compliance with PESO regulations — including storage capacity limits, bund requirements, fire safety provisions and site approval documentation.
Applies to
Fuel Storage (India) Diesel Tanks Petrol Tanks PESO Approval
ISO 9001
Quality Management Systems
CAS operates to an ISO 9001 quality management framework — systematic documentation, process control, non-conformance management and continual improvement. Every project generates a quality record set: ITPs, inspection reports, NCRs, hydrostatic test records and a final Data Book issued at mechanical completion.
Applies to
All Projects ITP NCR Management Data Book
ISO 14644
Cleanrooms & Controlled Environments
CAS's cleanroom installations are designed and built in accordance with ISO 14644 — the international standard series for cleanroom classification, monitoring, and testing. Installations are validated for particle count, air change rates and differential pressure to the agreed ISO classification.
Applies to
Cleanroom EPC HVAC Validation Pharma
ASNT SNT-TC-1A
NDE Personnel Qualification
Non-destructive examination personnel deployed by CAS are qualified to ASNT SNT-TC-1A — the industry standard for NDE technician qualification and certification. NDE methods deployed include radiographic testing (RT), ultrasonic testing (UT), magnetic particle inspection (MT), liquid penetrant testing (PT) and visual testing (VT).
Applies to
RT UT MT PT VT
Quality management approach
01
Inspection & Test Plan (ITP)

Every project begins with a CAS-issued ITP aligned to the applicable standard. Hold points and witness points are defined before work commences. No phase proceeds until the preceding inspection is formally signed off.

02
Non-Conformance Management

All non-conformances are raised on NCRs, tracked through to closure with objective evidence. CAS does not close an NCR without documented corrective action and verification. NCR logs are included in the project Data Book.

03
Welding Control

All site welding is performed under CAS-issued WPS and PQR, qualified to ASME Section IX. Welder qualification records are maintained and updated. Inter-pass inspection and visual examination are performed on all structural welds.

04
Data Book at Mechanical Completion

CAS compiles a complete project Data Book at mechanical completion — dimensional inspection reports, NDE records, hydrostatic test records, coating DFT readings, NCR close-out records and the Mechanical Completion Certificate. Every project has a permanent quality record.

05
Third-Party Inspection Coordination

Where a TPIA or TPI is appointed by the client, CAS coordinates hold point and witness point activities — providing minimum 48 hours' written notice. TPI coordination is built into our programme at no additional cost provided it does not disrupt the critical path.

06
Honest Language on Certification

CAS works to these standards on every applicable project. Where formal third-party certification is held by a partner, we will identify that clearly. We do not overstate credentials — our technical track record speaks for itself.