Upstream wellheads to downstream refineries — carbon steel, alloy steel, stainless, duplex, and nickel alloy buttweld and forged fittings for every O&G service condition. Sour service compliant. EN 10204 3.1 standard, 3.2 with TPI on request.
Request O&G Fittings QuoteExploration and production facilities including Christmas trees, production manifolds, flow lines, and wellhead pipework. Sour service (H₂S-bearing) is common — NACE MR0175 compliance required.
Long-distance transmission pipelines, compressor stations, gas processing plants, and NGL extraction units. Large-bore fittings (NPS 16–48) in heavy wall schedules.
Crude distillation, vacuum distillation, hydrocracker, catalytic reformer, coker, FCC, isomerisation, alkylation — each unit demands different materials based on operating temperature and corrosive species.
Ethylene crackers, propylene plants, aromatics units, and derivative chemical plants. High temperature + coke-forming atmospheres require alloy steel (WP9, WP91) or stainless steel.
For H₂S-containing streams (sour gas, sour crude), all materials must comply with NACE MR0175 / ISO 15156. Key requirements:
Please specify sour service requirement in your RFQ — we will ensure appropriate material certification and testing.
| Service Condition | Max Temp | Recommended Grade | Standard | Certificate |
|---|---|---|---|---|
| General sweet service | 370°C | ASTM A234 WPB / EN P235GH | ASME B16.9 / EN 10253-1 | 3.1 |
| High-temp refinery (H₂ service) | 570°C | WP22 / EN 1.7380 | ASME B16.9 / EN 10253-3 | 3.1 |
| Supercritical — ethylene / H₂ | 650°C | WP91 / EN 1.4903 | ASME B16.9 / EN 10253-3 | 3.1 or 3.2 |
| Sulphur-containing high-temp | 600°C | WP5 (1.7362) or WP9 (1.7386) | ASME B16.9 / EN 10253-3 | 3.1 |
| Sour gas / H₂S service | 150°C | WPB (NACE) + HIC test, or Incoloy 825 | ASME B16.9, NACE MR0175 | 3.1 |
| Overhead condenser (overhead corrosion) | 200°C | 316L (1.4404) or 316Ti (1.4571) | ASME B16.9 / EN 10253-2 | 3.1 |
| HF alkylation unit | 80°C | Monel 400 (2.4360) | ASTM B366 | 3.1 |
| Offshore / subsea high-chloride | 200°C | Super Duplex 2507 (1.4410) | ASME B16.9 / EN 10253-2 | 3.2 (TPI) |
| Severe chemical / H₂S + CO₂ | 300°C | Hastelloy C-276 (2.4819) | ASTM B366 / EN 10253-4 | 3.2 (TPI) |
Sour service requires NACE MR0175 / ISO 15156 compliance. Carbon steel must have hardness ≤22 HRC and may require HIC testing. For temperatures where CS is insufficient, Duplex 2205 (1.4462) is preferred for high chloride + H₂S. Incoloy 825 (2.4858) resists polythionic acid attack. Inconel 625 (2.4856) is used in the most aggressive sour gas injection wells. Specify sour service and NACE MR0175 compliance explicitly in your purchase order.
Our core scope is ASME B16.9 (buttweld), ASME B16.11 (forged SW & threaded), and EN 10253-1/-2/-3/-4. ASME B16.9 is referenced by ASME B31.4 and B31.8 which are the primary pipeline codes used in the oil & gas industry. We also supply MSS SP-75 pipeline fittings (WPHY 52, 60, 65, 70) to order. API 6A/17D wellhead fittings are outside our scope. Contact us for pipeline-grade WPHY fittings.
Standard supply: EN 10204 3.1 mill test certificate with heat chemistry, mechanical properties, heat treatment, and heat number traceability. EN 10204 3.2 with TUV Rheinland or Lloyd's Register Asia is available for PED Cat III–IV and offshore projects. NACE supplementary documentation (HIC test reports, SSC test data) available on request for sour service. Dimensional inspection reports per applicable ASME B16.9 / EN 10253 inspection criteria available on request.
