ISO 15649:2001

Overview

ISO 15649:2001 - "Petroleum and natural gas industries - Piping" specifies requirements for the design, construction, inspection and testing of piping used inside facilities that process or handle chemical, petroleum, natural gas or related products. It covers both metallic and non‑metallic piping and packaged equipment piping that interconnects individual pieces of equipment. The standard explicitly excludes transportation pipelines and their associated plant (for example, pipeline compressor or pump stations and risers up to pig launch facilities).

Key topics and technical requirements

ISO 15649:2001 focuses on high‑level, practice‑oriented requirements and references established process‑piping practice:

• Normative reference to ANSI/ASME B31.3 (Process Piping) as a basis for detailed design and construction.
• Responsibilities: defines roles and obligations for the owner, designer, manufacturer, fabricator/erector to ensure fitness‑for‑purpose of piping systems.
• Materials: suitability, selection and verification of metallic and non‑metallic piping materials.
• Design conditions: specification of design pressure and design temperature, minimum design temperature, and fluid service category for safe sizing and rating.
• Layout and clearances: recommended routing, supports, and spacing (informative Annex A).
• Buried piping: installation, trenching, backfill, sleeves/casings, corrosion protection and testing (informative Annex B).
• Draining, venting, erosion & abrasion: provisions to avoid service degradation and ensure maintainability.
• Inspection and testing: requirements for pressure testing, examination and verification during fabrication and erection.
• Emphasis on pressure relief and ensuring piping protected from pressures beyond intended design.

Note: ISO 15649 allows substitution of other coherent standards where agreed by the owner, provided equivalent fitness for purpose can be demonstrated.

Practical applications

ISO 15649:2001 is intended for piping inside:

• Petroleum refineries, loading terminals, LNG and natural gas processing plants
• Offshore production platforms (process piping, not export pipelines)
• Chemical plants, tank farms, bulk and compounding plants
• Packaged equipment assemblies where internal interconnecting piping is supplied as part of a skid or unit

Typical users:

• Process, piping and mechanical engineers specifying design conditions and materials
• Owners and asset operators defining procurement and inspection criteria
• Fabricators, manufacturers and erectors responsible for assembly and installation
• Inspectors and quality assurance teams conducting testing and certification

Related standards

• ANSI/ASME B31.3 (Process Piping) - normative reference and primary technical basis for detailed requirements.

Keywords: ISO 15649:2001, piping standard, petroleum piping, natural gas piping, process piping, ANSI/ASME B31.3, piping design, piping inspection, buried piping, packaged equipment piping.