Overview
SIST EN ISO 13703-3:2023 (ISO 13703-3:2023) - Oil and gas industries including lower carbon energy - Piping systems on offshore production platforms and onshore plants - Part 3: Fabrication - defines fabrication requirements for new metallic piping systems used in oil, gas and lower‑carbon energy facilities. The standard applies to fixed and floating offshore production facilities and onshore production, processing and liquefaction plants for pressure‑retaining systems up to 69 000 kPa (gauge) and to non‑pressure parts welded directly to pressure components. It excludes marine‑related piping covered by classification societies and non‑metallic piping.
Key topics and technical requirements
ISO 13703-3 focuses on practical fabrication controls and inspection practices. Major topics include:
- Welding requirements: general rules, approved welding processes, preparation, qualification of welders and operators.
- Welding consumables: selection and requirements for carbon steels, stainless steels (including duplex grades) and high‑alloy materials; shielding/backing gases.
- Welding procedure qualification (WPQ/WPS): essential variables, additional rules for specific alloys, and sour‑service considerations.
- Preheat and post‑weld heat treatment (PWHT): requirements for minimizing residual stress and ensuring metallurgical integrity.
- Pipe bending: cold bending and hot induction bending requirements and heat treatment of bends.
- Installation and joints: threaded and bolted connection practices and mechanical assembly controls.
- Inspection, examination and testing: visual (VT), magnetic particle (MT), liquid penetrant (PT), radiographic (RT), ultrasonic (UT), positive material identification (PMI), production and leak testing, ferrite testing of weld metal and repair criteria.
- Cleaning, preservation and leak/tightness testing: flushing, preservation and commissioning checks.
- Annexes: informative guidance (e.g., oxidation images) and normative requirements for bending processes; includes guidance relevant to the European Pressure Equipment Directive (PED).
Practical applications and users
This standard is used to ensure fabrication quality, safety and regulatory compliance for onshore and offshore piping in hydrocarbon and lower‑carbon energy projects. Typical users:
- EPC contractors and piping fabricators
- Welding engineers and welding supervisors
- NDE/inspection teams and QA/QC engineers
- Plant owners/operators and maintenance teams
- Project managers specifying fabrication acceptance criteria
Adopting ISO 13703-3 helps reduce fabrication defects, ensures consistent welding and inspection practices, and supports safe commissioning and operation of high‑pressure piping systems.
Related standards and references
- ASME B31.3 - referenced for material temperature limits and related piping design requirements.
- European Pressure Equipment Directive (PED) - guidance included in Annex D.
- Applicable NDE and welding standards (refer to normative references in the standard).
Keywords: ISO 13703-3, piping systems fabrication, offshore production platforms, onshore plants, welding procedure qualification, non‑destructive examination, preheat PWHT, pressure retaining components.
