NACE MR0175 / ISO 15156 Sour Service Valve Manufacturer — India
Gate, globe, ball, and check valves manufactured and certified to NACE MR0175 / ISO 15156 for H2S sour service in upstream oil and gas, gas processing, and sour crude pipeline applications.
Hydrogen sulphide (H2S) in produced fluids creates a highly corrosive environment that can cause sulphide stress cracking (SSC), hydrogen-induced cracking (HIC), and stress-oriented HIC (SOHIC) in susceptible alloys. NACE MR0175, now published as ISO 15156, defines the material qualification requirements — principally hardness limits, heat-treatment conditions, and alloy restrictions — that must be met by all metallic components exposed to the sour environment. Supreme Valves India supplies a full range of gate, globe, ball, and check valves certified to NACE MR0175 / ISO 15156, with hardness certificates, PMI, and third-party inspection available for every order.
Valve Types Offered — NACE Compliant
NACE MR0175 / ISO 15156 Key Requirements
- Carbon and low-alloy steel body hardness: maximum 22 HRC (237 HB) — verified by Brinell or Rockwell hardness test certificate
- Normalising heat treatment of ASTM A105N forgings (N suffix confirms normalised condition)
- Stainless steel and Duplex alloys must comply with ISO 15156 Part 3 tables for H2S partial pressure and chloride limits
- Bolting hardness: maximum B7M studs (25 HRC max) with 2HM nuts for sour service
- No copper alloys, standard austenitic stainless without compliance review, or hard-faced trim exceeding hardness limits
- PMI (Positive Material Identification) report available for all pressure-retaining parts
- Documentation package: MTR, hardness certificate, PMI, API 598 hydro test, NACE compliance declaration
Applications
Upstream oil and gas wellhead and flowline isolation, sour crude pipeline block valves, gas processing plant (amine units, sulphur recovery, dehydration), offshore topside and subsea valves, and LNG/gas transmission where H2S partial pressure exceeds NACE threshold (0.0003 MPa / 0.05 psia). Export supply to operators and EPC contractors in the Middle East (Saudi Arabia, Kuwait, UAE, Oman), West Africa, and India.
Related Products
Also see: API 600 Gate Valves, Motor Operated Ball Valve (MOV), Class 600 Globe Valve WC6.
Frequently Asked Questions
What does NACE MR0175 / ISO 15156 compliance require for valves?
NACE MR0175 (now ISO 15156) sets hardness limits, alloy restrictions, and heat-treatment requirements for metallic materials in H2S-containing environments to prevent sulphide stress cracking (SSC) and hydrogen-induced cracking (HIC). For valves, body hardness must not exceed 22 HRC for carbon and low-alloy steels, and trim alloys must comply with the permitted material tables in ISO 15156 Parts 2 and 3.
Which body materials are permitted for NACE sour service valves?
Commonly used NACE-compliant body materials include ASTM A105N (normalised, max 22 HRC), ASTM A216 WCB/WCC, ASTM A217 WC6, ASTM A352 LCB (low temp), ASTM A351 CF8M (316SS), and UNS S31803 Duplex stainless. All materials require hardness certificate and PMI test reports where specified.
What documentation is supplied with a NACE valve order?
A standard NACE sour service valve package includes Mill Test Reports (MTRs), Hardness Test Report (Brinell/Rockwell per NACE limits), PMI report (if specified), Dimension Inspection Report (DIR), Hydrostatic Test Report (API 598), and a Declaration of NACE MR0175/ISO 15156 compliance. Third-party inspection by Bureau Veritas, TUV, or LLOYDS is available on request.
Need NACE MR0175 Compliant Valves for Sour Service?
Share your line list or MR (Material Requisition) and we will confirm NACE compliance, available materials, and lead times. We export to Saudi Arabia, Kuwait, UAE, Oman, and West Africa.