EN 14870-3:2006 PDF

Overview

EN 14870-3:2006 - Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 3: Flanges (ISO 15590-3:2004, modified) specifies technical requirements for carbon steel and low-alloy forged flanges used in pipeline transportation systems for the petroleum and natural gas industries (as defined in ISO 13623). It covers weldneck and blind flanges (full-face, raised-face, RTJ groove), anchor and swivel-ring flanges, and orifice flanges intended to match ISO 3183 pipe. The standard applies to normal and low-temperature service and includes supplementary provisions for sour service. It excludes bolting, gaskets, slip-on flanges, factory-welded extensions and integrally cast/forged flanges for valves or equipment.

Key Topics and Requirements

• Scope & compatibility
  • Flange categories matched to ISO 3183 pipe grades and thicknesses.
  • Sizes: DN 10 (NPS 1/2) to DN 1500 (NPS 60).
  • Pressure classes: PN 20 (Class 150) up to PN 420 (Class 2500) as per ISO 7005-1.
• Materials
  • Carbon steel and low-alloy steel forged flanges; sour-service supplementary requirements referenced.
• Manufacturing controls
  • Manufacturing Procedure Specification (MPS) requirements, starting material control, hub configuration and heat treatment.
• Testing & inspection
  • Chemical composition and mechanical property verification (tensile, impact where applicable).
  • Non-destructive testing (NDT): magnetic particle, liquid penetrant, ultrasonic as required.
  • Dimensional checks and hydrostatic testing where applicable.
  • Weldability and repair welding guidance for forged flanges.
• Documentation & marking
  • Inspection documents, manufacturing record book and traceability/marking requirements.

Applications and Who Uses It

EN 14870-3:2006 is used by:

• Pipeline designers and engineers specifying flanges for crude oil, gas and product transmission systems.
• Flange and forging manufacturers producing weldneck, RTJ, blind and orifice flanges compatible with pipeline steels.
• Quality/inspection teams performing material verification, NDT and acceptance testing.
• Procurement and project managers ensuring flange supply meets pipeline transport system requirements and sour-service conditions.

Practical applications include flange selection for pipeline joints, tie-ins, metering orifice installations, anchor points and high-pressure/large-diameter transmission pipelines.

Related Standards

• ISO 15590-3:2004 (base document)
• ISO 13623 (pipeline transportation systems)
• ISO 3183 (steel pipe for pipelines)
• ISO 7005-1 (steel flanges: sizes & pressure classes)
• ISO 15156-2 (materials for H2S-containing environments)
• ASME B16.5 / B16.47 (flange dimensions & classes)

EN 14870-3:2006 is essential when specifying forged flanges for petroleum and natural gas pipeline systems to ensure material, manufacturing and testing consistency with industry practice.