Article
Oil and gas is one of the most demanding markets for piping products. Pressures are high, fluids can be corrosive or toxic, and failures are costly. As a result, specifications are detailed and documentation is extensive.
Where piping is used
- Upstream – wellheads, flowlines, manifolds and production platforms
- Midstream – pipelines, compressor stations and storage terminals
- Downstream – refineries, petrochemical units and gas processing plants
Common products
| Product | Typical specification |
|---|---|
| Carbon steel pipe | ASTM A106 Gr B, API 5L Gr B to X70 |
| Stainless steel pipe | ASTM A312 TP304L / TP316L / TP321 |
| Duplex pipe | ASTM A790 S31803 / S32205 / S32750 |
| Buttweld fittings | ASTM A234 WPB, A403 WP316L, A815 duplex; ASME B16.9 |
| Flanges | ASTM A105, A350 LF2, A182 F316L / F51; ASME B16.5 / B16.47; RTJ in higher classes |
| Bolting and gaskets | ASTM A193 B7 / A194 2H, spiral wound and RTJ gaskets |
Sour service
Where hydrogen sulphide (H2S) is present, materials must resist sulphide stress cracking. Buyers then specify compliance with NACE MR0175 / ISO 15156 (upstream) or NACE MR0103 (refining), which limit hardness and set material requirements.
Typical buyer requirements
- EN 10204 3.1 certificates, often 3.2 with third-party inspection
- Hardness testing and PMI
- Impact testing for low-temperature service
- Strict marking and traceability
- Export packing suitable for sea freight and outdoor storage
- Approved vendor list or prior project references
What matters most to purchase teams
Correct specifications the first time, complete documents, clear lead times and responsive communication. A supplier who reviews the specification carefully before quoting reduces the risk of costly non-conformities later.
Frequently asked questions
What is NACE MR0175?
A standard (also ISO 15156) setting material requirements for equipment in H2S-containing oil and gas production environments.
Which flange type is most used in oil and gas?
Weld neck flanges, with raised face in lower classes and RTJ facing in higher pressure classes.
What certificate do oil and gas buyers usually need?
At least EN 10204 3.1, and often 3.2 with third-party inspection.
Key takeaways
- Oil and gas uses high-specification pipes, flanges and fittings.
- Sour service requires NACE MR0175 / MR0103 compliance.
- Complete documentation and traceability are essential.
Need these products?
Sawariya Metal Industries supplies stainless steel pipes, flanges and buttweld pipe fittings from Mumbai to buyers in India and overseas. Send your size, grade, standard and quantity through our enquiry form and we will reply with a clear quotation and the test documents you need. You can also browse our stainless steel pipes, flanges and buttweld fittings.