How Oil & Gas OEMs Qualify Indian Forging Suppliers: The Complete Process
Oil and gas forging supplier qualification is the structured process by which operators, EPC contractors, and equipment OEMs evaluate and approve Indian forging manufacturers to supply pressure-retaining and structural forged components for oil and gas programmes. The process is distinct from aerospace and defence qualification in its emphasis on API certification, third-party inspection integration, and operator-specific supplementary requirements — but shares the same fundamental logic: a supplier who passes the qualification process has demonstrated that their quality system, process capability, and documentation standard will produce acceptable components consistently across a multi-year supply relationship.
At a Glance: Oil & Gas Forging Supplier Qualification Stages
| Stage | Activity | Typical Duration |
| 1 | API license verification and document review | 2–4 weeks |
| 2 | On-site capability assessment | 4–8 weeks to arrange and execute |
| 3 | Qualification test forgings | 6–12 weeks |
| 4 | Third-party inspection integration trial | 2–4 weeks |
| 5 | Approved vendor listing | 4–8 weeks |
| Total | First contact to first purchase order | 6–18 months |
Why Oil and Gas Qualification Is Different from Industrial Forging Assessment
A procurement team buying general engineering forgings for non-critical applications may evaluate suppliers primarily on price, lead time, and ISO 9001 certification. Oil and gas forging qualification operates at a fundamentally different level of rigour — for three reasons that are specific to the industry.
Regulatory consequence of failure.
A forging failure in oil and gas service causes hydrocarbon release. At wellhead pressures of 10,000–20,000 psi, a structural failure in a valve body or pressure housing is not a commercial quality event — it is a safety and environmental incident with regulatory consequences under the Petroleum Act, PNGRB regulations, or international equivalents depending on the jurisdiction.
Long-term field exposure.
Oil and gas forgings in subsea and offshore service must perform without maintenance access for 20–25 years. A material selection error or heat treatment deviation that is not caught during qualification will not manifest as a failure until years into field service — by which point the component may be in an inaccessible location and the entire production system may need to be shut down for replacement.
Third-party inspection is structural.
Unlike defence (DGQA) or aerospace (CEMILAC) where the regulatory oversight body is a government authority, oil and gas qualification routinely involves commercial third-party inspection companies — Bureau Veritas, DNV, SGS, Intertek, Lloyd’s Register — whose sign-off on material test results is a commercial contractual requirement from the operator. Suppliers who cannot integrate TPI effectively into their production workflow fail qualification regardless of how good their internal quality system is.
Stage 1: API License Verification and Document Review
The starting point for any oil and gas forging supplier assessment is API license verification. This is not a courtesy check — it is a contractual pre-condition.
What Buyers Verify Before Site Visit
API 20B license currency and PSL coverage — request a copy of the current API 20B license. Verify the license number against API’s published list of licensed manufacturers. Check the expiry date. Check which PSL levels are covered — a supplier licensed to PSL 2 cannot supply PSL 3 or PSL 4 specifications regardless of their physical capability.
API 20C license where CRA grades are required — for duplex, super duplex, or Inconel forgings, a separate API 20C license is required. API 20B does not cover corrosion-resistant alloys.
Quality management system — API 20B requires the manufacturer to hold ISO 9001 as a minimum. Most serious oil and gas operators require AS9100D or equivalent for critical forging supply. Verify the QMS certification is current and covers the specific processes and facilities proposed for the programme.
Material capability statement — request evidence of recent production in the specific material grades required. For carbon steel AISI 4130 or ASTM A105 valve body forgings: recent MTRs showing production in these grades. For duplex 2205: recent MTRs with ferrite content results. For Inconel 625: recent production records from a credible reference customer.
NACE MR0175 compliance procedure — for sour service forgings, the supplier must have a documented procedure for ensuring NACE MR0175 hardness compliance. Request this procedure and review whether it addresses: incoming carbon equivalent verification, heat treatment qualification to achieve target strength within the hardness limit, 100% hardness testing of sour service components, and disposition of components failing the hardness limit.
Third-party inspection experience — which TPI companies has the supplier worked with? Do they have a dedicated TPI coordination procedure? A supplier who has never hosted a Bureau Veritas or DNV witness inspection will face a steep learning curve that adds time and cost to the qualification programme.
Stage 2: On-Site Capability Assessment
The capability assessment visit for oil and gas forgings focuses on the process controls that are most failure-critical for pressure-retaining components — heat treatment, NDE, and documentation traceability.
What Oil and Gas Assessors Check That General Audits Miss
Quench system capability for duplex grades — if the supplier claims duplex forging capability, the assessor will specifically inspect the quench system. How large is the quench tank relative to the largest duplex forging the supplier proposes to supply? Is there mechanical agitation? Is the water temperature monitored and controlled? A large duplex valve body in a small or inadequately agitated quench tank will not cool fast enough through the sigma phase range. The assessor may ask to review the quench cooling rate qualification data — what evidence exists that the quench system achieves adequate cooling rate for the maximum section size?
Sour service hardness control system — for suppliers claiming NACE MR0175 compliance capability, the assessor will review how hardness is controlled end-to-end. Is the incoming carbon equivalent verified for every heat? Is there a validated heat treatment procedure that demonstrates achievement of target strength within the 22 HRC / 250 HBW maximum? Is 100% hardness testing performed on all sour service components? Is there a documented hold point before sour service components are released?
NDE calibration standard material — for duplex and super duplex UT, the calibration reference standard must be made from the same duplex alloy as the production forging. If the supplier proposes to use a carbon steel reference standard for duplex forging UT calibration, this is an immediate finding — the acoustic properties are different and the calibration is invalid.
PMI capability — major operators including Saudi Aramco and ADNOC require 100% positive material identification by XRF or OES spectrometry on all forgings before shipment. Does the supplier have a calibrated PMI instrument in-house? Is there a documented PMI procedure?
Traveller and traceability live test — same as aerospace and defence: ask the assessor to trace a forging currently in production back to its raw material MTR in real time without advance preparation. For oil and gas forgings, the trace must additionally include the heat-specific PREN calculation (for duplex) or the carbon equivalent calculation (for sour service carbon steel).
Stage 3: Qualification Test Forgings
The oil and gas qualification test forging programme verifies that the supplier can produce forgings meeting the specification requirements for the buyer’s specific application — not generic material properties, but the specific drawing, heat treatment specification, and NDE acceptance criteria that will apply to production supply.
What the Test Forging Programme Covers
Material to specification — the test forgings must be produced from raw material certified to the applicable ASTM specification. The MTR must show compliance to every chemistry and mechanical property requirement. For duplex grades, the heat-specific PREN must meet the specified minimum. For sour service carbon steel, the heat-specific carbon equivalent must meet the NACE MR0175 limit.
Heat treatment qualification — the test forgings are heat treated to the supplier’s qualified procedure. Results must demonstrate:
- Tensile strength and yield strength within the specified range
- Charpy impact at the specified test temperature (ambient, -20°C, -46°C, or lower depending on application) exceeding the minimum specified energy
- Hardness at every location within the acceptance range — and below 22 HRC / 250 HBW for sour service grades
- Ferrite content within 40–60% for duplex grades, at multiple locations
NDE to specified acceptance criteria — UT scanning of 100% volume for forgings above threshold weight. MT or FPI of all surfaces. Results must pass the acceptance criteria specified by the buyer — which for major operators is often tighter than the API 20B baseline.
Dimensional verification — all specified dimensions measured and recorded. For valve body forgings, bore concentricity, end connection face squareness, and minimum wall thickness are key characteristics that must be demonstrated in the qualification forging.
Documentation package review — the complete documentation package for the test forgings is reviewed for compliance with the buyer’s documentation requirements. This is where many Indian suppliers fail on their first submission — the individual documents may be correct but the package is incomplete, cross-references are inconsistent, or the format does not match the buyer’s specification.
Stage 4: Third-Party Inspection Integration Trial
This stage is specific to oil and gas and has no direct equivalent in aerospace or defence qualification. Most major oil and gas operators require third-party inspection by an approved inspection company for all forgings — not just qualification lots but every production delivery.
What the TPI Integration Trial Covers
Pre-inspection meeting — the TPI company reviews the applicable specifications, the supplier’s quality plan, and the inspection and test plan (ITP) for the programme. Hold points — stages where production cannot proceed without TPI witness or review — are agreed and documented.
Heat treatment witness — the TPI inspector attends the facility for the heat treatment of the test forgings. The inspector reviews the furnace calibration records before the heat treatment begins, witnesses the heat treatment cycle, reviews the furnace chart at completion, and witnesses hardness testing.
NDE witness — the TPI inspector witnesses UT scanning and MT or FPI inspection. Calibration records are reviewed before inspection begins. The inspector confirms that acceptance criteria being applied match the specification requirements.
Documentation review and release — the TPI inspector reviews the complete documentation package — MTR, heat treatment record, NDE reports, dimensional inspection report, and CoC — before issuing the TPI release certificate.
Communication and scheduling effectiveness — the TPI integration trial reveals how well the supplier coordinates with external inspection. Does the supplier notify TPI with adequate lead time? Is a dedicated quality contact available throughout the TPI visit? Are all documents ready for review when the inspector arrives?
A supplier who consistently requires multiple TPI visits to complete a single lot inspection — because documentation is not ready, because hold points were not notified on time, or because inspection results are challenged — creates programme friction that causes buyers to qualify alternative sources.
Stage 5: Approved Vendor Listing
Following satisfactory completion of Stages 1–4, the buyer’s procurement or supply chain team processes the supplier for addition to the approved vendor list. For major operators this involves:
Technical review — the engineering team reviews the qualification test results and confirms they meet programme requirements.
Quality system confirmation — confirmation that API 20B license and QMS certification are current and will remain current throughout the supply period.
Commercial terms — pricing, delivery, packaging, documentation requirements, and inspection notification lead times are formalised.
AVL approval — the supplier is added to the approved vendor list for the specific material family, PSL level, and product type demonstrated during qualification.
AVL Maintenance Requirements
Oil and gas AVL status requires active maintenance:
API 20B license renewal — API licenses are renewed on a triennial basis following a re-audit. Buyers typically verify license currency annually and may suspend orders if a license lapses.
Delivery performance — on-time delivery percentage is tracked. Most buyers have defined thresholds — below 85–90% on-time delivery triggers a performance review.
Quality performance — incoming rejection rate is tracked. A single quality escape reaching the operator’s facility — particularly for safety-critical items — triggers an immediate corrective action request and may result in AVL suspension pending investigation.
Periodic re-assessment — most operators conduct supplier re-assessments every 2–3 years. The re-assessment covers whether the quality system, equipment, and key personnel remain in place, and whether quality metrics justify continued AVL status.
Saudi Aramco Qualification: The Most Demanding Pathway
Saudi Aramco’s vendor qualification for forging manufacturers represents the highest standard of oil and gas supplier qualification applied by any single operator. Qualification to Aramco’s approved vendor list — covering the SAMSS-012 supplementary requirements for forgings — provides a qualification credential that is recognised by most other major operators as evidence of capability and quality system maturity.
What Aramco Qualification Adds to the Standard Process
SAMSS-012 technical requirements — tighter chemistry limits than standard ASTM (maximum sulphur 0.010% versus 0.040% in A105, for example), specific heat treatment requirements submitted and approved by Aramco engineering before production, mandatory Charpy impact at -46°C for all forgings regardless of design temperature.
Aramco vendor qualification audit — an Aramco technical team visits the supplier’s facility. This audit is more technically detailed than a standard API 20B audit — Aramco auditors include metallurgists and materials engineers who interrogate the process parameters, not just the quality system.
Approved inspection company requirement — all Aramco forging deliveries require TPI by an Aramco-approved inspection company. The approved list includes Bureau Veritas, DNV, Intertek, SGS, and TÜV among others. The TPI company issues an Aramco-format inspection release certificate for each lot.
100% PMI — positive material identification by XRF or OES on every forging in every lot before shipment.
Once qualified to Aramco’s approved vendor list, Indian forging manufacturers have demonstrated capability at a level that opens doors to the broader Middle East oil and gas market — QatarEnergy, ADNOC, PDO Oman, and Kuwait Oil Company all use Aramco qualification as a reference point in their own vendor assessment processes.
How Vinir Engineering Approaches Oil & Gas Qualification
Vinir Engineering enters oil and gas forging qualification discussions with the most significant barriers already cleared. API 20B certification across all four manufacturing units. AS9100D covering the complete forge-to-finish scope. NABL-accredited in-house testing for all required mechanical and chemical tests. In-house UT and FPI by ASNT Level II certified operators. Established TPI working relationships with Bureau Veritas, DNV, SGS, and Intertek.
For buyers beginning oil and gas forging supplier assessment, Vinir can provide a complete Stage 1 qualification package — API 20B license, AS9100D certificate, capability statement, recent MTRs in required material grades, NACE MR0175 compliance procedure, TPI coordination procedure — within five working days.
Frequently Asked Questions — Oil & Gas Forging Supplier Qualification India
How long does oil and gas forging supplier qualification take for an Indian manufacturer?
For a well-prepared Indian forging manufacturer with API 20B in place — Stage 1 document review takes 2–4 weeks. Stage 2 site assessment visit takes 4–8 weeks to arrange and execute. Stage 3 qualification test forgings take 6–12 weeks including heat treatment and NDE. Stage 4 TPI integration trial adds 2–4 weeks. Stage 5 AVL processing takes 4–8 weeks. Total: 6–12 months for a standard qualification. Saudi Aramco qualification, with the additional SAMSS requirements and Aramco technical audit, typically takes 12–18 months from initial approach to AVL approval.
Can an Indian forging manufacturer be qualified for multiple oil and gas operators simultaneously?
Yes. Each operator’s qualification is independent — being qualified for ONGC does not automatically qualify a supplier for Saudi Aramco or ADNOC. However, the quality system infrastructure, process capability, and documentation standards developed for one operator’s qualification significantly reduce the effort and time required for subsequent qualifications. Suppliers who qualify for the most demanding operators first — Saudi Aramco, for example — find that subsequent qualification for other operators is substantially faster because the quality system already exceeds most operators’ requirements.
What is the difference between API 20B qualification and operator-specific qualification?
API 20B qualification is manufacturer qualification by the American Petroleum Institute — it confirms that the manufacturer’s quality system and processes meet the API 20B specification requirements. Operator-specific qualification (Saudi Aramco SAMSS, ADNOC specifications, NORSOK M-630) layers additional requirements on top of API 20B — tighter chemistry limits, specific heat treatment approval, mandatory TPI by approved companies, 100% PMI, and operator-specific testing. API 20B is a necessary baseline; operator-specific qualification is what enables direct supply to the operator’s procurement programmes.
What is an inspection and test plan (ITP) and why is it required for oil and gas forging qualification?
An ITP is a document that lists every inspection and test activity in the manufacturing sequence, identifies who performs each activity (supplier, TPI, or operator), and defines the hold points where production cannot proceed without the specified witness or review. For oil and gas forging qualification, the ITP is submitted to the operator or TPI company for review and approval before production begins on qualification lots. The ITP defines the quality assurance structure for the programme — a supplier without a comprehensive ITP cannot effectively integrate TPI inspection or demonstrate to the operator that quality activities are systematically planned.
What does positive material identification (PMI) involve and why do operators require it?
PMI is the verification of material composition using a hand-held XRF or OES spectrometer directly on the finished forging. It confirms that the alloy installed matches the specified material and the MTR. Operators including Saudi Aramco and ADNOC require 100% PMI because material mix-ups — a carbon steel forging in a duplex or alloy steel specification — have caused significant safety incidents. MTR verification alone does not catch a physical mix-up if the wrong billet was allocated to the job. PMI takes 2–5 minutes per component and is performed immediately before final inspection or TPI release.
