SIST EN ISO 17945:2015 PDF

Overview

EN ISO 17945:2015 (ISO 17945:2015) defines material requirements and guidance for preventing sulfide stress cracking (SSC) of metallic materials in sour petroleum refining environments containing hydrogen sulfide (H2S), either gaseous or dissolved in aqueous phases. It is a materials-focused standard (not a design code) intended for use where SSC could: (1) compromise pressure containment, (2) prevent basic equipment function, or (3) prevent safe restoration of pressurized equipment. The standard is endorsed by CEN as EN ISO 17945:2015.

Key topics and technical requirements

The standard addresses practical, actionable topics for SSC resistance and material control:

• Scope and responsibilities: defines responsibilities of end users and manufacturers for material selection and documentation.
• Factors contributing to SSC: material condition, applied stress levels, hydrogen permeation flux, elevated temperature exposure, and time-to-failure considerations.
• Materials classification: lists ferrous and non‑ferrous families (carbon and alloy steels, ferritic/martensitic/austenitic and duplex stainless steels, nickel, cobalt, titanium, aluminium, copper alloys) and special grade considerations.
• Hardness and fabrication requirements: sets hardness limits and fabrication controls to reduce SSC susceptibility (welding, overlays, cladding, heat treatment, cold deformation).
• Welding, overlays and cladding: guidance for weld procedures, corrosion‑resistant overlays and thermal spray coatings on steels to mitigate SSC risk.
• Qualification and testing: procedures for adding new materials or processes, including requirements for field experience and laboratory test data.
• Exclusions: explicitly excludes other wet H2S cracking modes, unrelated environmental cracking and corrosion mechanisms; not a design or pressure‑rating specification.

Applications

EN ISO 17945:2015 is directly applicable to selection, procurement and fabrication of equipment used in sour refining and related processing, including:

• Pressure vessels, heat exchangers, piping and tubing
• Valve bodies, pump and compressor cases
• Specification and acceptance criteria for materials and welds in sour service
• Development of material qualification programs and inspection plans to mitigate sulfide stress cracking

Who should use this standard

• Refiners and operators establishing sour‑service material specifications
• Equipment manufacturers and fabricators (pressure parts, valves, rotating equipment)
• Engineering, procurement and construction (EPC) contractors writing procurement documents
• Materials engineers and inspectors developing qualification and testing programs

Related standards

• ASME Boiler and Pressure Vessel Code (Section IX) - referenced for carbon steel classification (P‑No. 1)
• NACE SP0472 - compliance required for certain carbon steels as noted in ISO 17945:2015
• ISO/TC 67 publications and industry sour‑service guidance

EN ISO 17945:2015 is an essential reference for reducing SSC risk in sour refinery environments through informed material selection, controlled fabrication, and appropriate qualification practices.