NACE MR0103
Standard Specification

NACE MR0103 Butterfly Valves

What NACE MR0103 requires for butterfly valves — applicability, key and testing requirements, the alternative standards, and compliant supply with full certification.

What does NACE MR0103 require for butterfly valves?

NACE MR0103 (Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refinery Environments, NACE International (now AMPP)) sets the design, material and testing requirements for butterfly valves in its scope. NACE MR0103 specifies the metallurgical requirements for materials used in petroleum refinery environments where wet hydrogen sulfide (H₂S) can cause sulfide stress cracking (SSC). While the related standard NACE MR0175 (ISO 15156) applies to upstream oil and gas production environments, MR0103 covers the specific conditions found in refinery process streams - typically higher temperature, lower pH, and different H₂S partial pressures. Both standards may be co-specified on the same valve for refinery projects.

Applicable Pressure Classes

All pressure classes

Key Requirements

  • Carbon steel hardness limit: ≤22 HRC (Rockwell C) for base metal and welds
  • Heat treatment: PWHT (Post Weld Heat Treatment) required for carbon and low-alloy steel valves
  • Maximum yield strength for carbon steel: 90 ksi (620 MPa) in most conditions
  • Austenitic stainless steels: cold worked material hardness ≤22 HRC
  • Nickel alloys: Alloy 625, Alloy C-276 permitted in specific tempers
  • Hardness testing: Brinell (HBW) or Rockwell (HRC) at critical locations
  • Excludes high-strength steels like AISI 4140 in quenched and tempered condition

Testing Requirements

  • Brinell or Rockwell hardness testing of body, bonnet, and trim
  • PWHT verification by hardness test
  • Traceability to heat treatment records

Alternative Standards for Butterfly Valves

Other standards that also govern butterfly valves — useful for spec cross-acceptance.

API 607Fire Test for Quarter-Turn Valves and Valves Equipped with Nonmetallic SeatsASME B16.34Valves - Flanged, Threaded, and Welding EndAPI 598Valve Inspection and TestingAPI 609Butterfly Valves: Double-Flanged, Lug- and Wafer-TypeISO 15848Measurement, Test, and Qualification Procedures for Fugitive Emissions - Industrial ValvesBS 6755Testing of Valves - Production Pressure Testing and Fire Type Testing RequirementsISO 5208Industrial Valves - Pressure Testing of Metallic ValvesISO 10497Testing of Valves - Fire Type-Testing RequirementsEN 593Industrial Valves - Metallic Butterfly ValvesASME B16.10Face-to-Face and End-to-End Dimensions of Valves

Related Standards

NACE MR0175 / ISO 15156API 6DASME B16.34API 598
Reviewed by Valve Standards Engineering, Vajra Industrial SolutionsDiscipline: Industrial Valve Standards & ComplianceLast reviewed: 20 June 2026

Connected Engineering

Standards
NACE MR0175
Failure Modes
Stress Corrosion Cracking
Products
Butterfly ValvesCheck Valves
Comparisons
Ball vs Butterfly Valve
Tools
Pressure Class Converter

Need NACE MR0103 butterfly valves?

We supply NACE MR0103-compliant butterfly valves with full certification — share your size, class and service for a 24-hour quote.

Request a Quote WhatsApp Call
Relevant Products
Vajra Butterfly Valves

Engineering references

NACE MR0103 full standardScope, requirements & documentationVajra Butterfly ValvesFull range, specs & standardsStandards Applicability MatrixWhich standard governs which type