EN ISO 6412-2:2018 PDF

Overview

EN ISO 6412-2:2018 (ISO 6412-2:2017) - Technical product documentation - Simplified representation of pipelines - Part 2: Isometric projection - specifies supplementary rules for producing clear three‑dimensional pipeline isometrics. Intended as an addendum to ISO 6412-1, this standard defines how to show essential pipeline features in isometric projection for tender, manufacturing and erection drawings. The document was prepared by ISO/TC 10 and adopted by CEN as EN ISO 6412-2:2018.

Key topics

• Scope and coordination: Applies where isometric representation is needed in technical product documentation and ties into the general rules of ISO 6412-1.
• Coordinates and axes: Guidance on Cartesian coordinates for pipe assemblies and how coordinates must align with the overall installation.
• Line conventions and projections: Line types and isometric drawing conventions consistent with ISO 128-20 and ISO 129-1.
• Deviations from coordinate axes: Rules for representing pipes that are not parallel to coordinate planes using auxiliary hatched projection planes and specific projection methods for pipes in vertical/horizontal planes.
• Dimensioning rules: Supplementary rules for diameters and wall thickness, longitudinal and angular dimensions, bending radii and angles, levels and slopes, positions of pipe ends, redundant dimensioning, and instructions for dimensioning for pipe‑bending machines.
• Graphical symbols: Examples and conventions for valves, transition pieces (cones), supports and hangers, crossings, permanent junctions, general connections and flanges when drawn isometrically.
• Examples and implementation: Illustrative examples to help apply the rules in practical isometric pipeline drawings.

Applications

• Producing pipeline isometric drawings for process plants, mechanical engineering and construction projects.
• Creating manufacturing and erection drawings that reduce drafting time while improving clarity of three‑dimensional relationships.
• Preparing documents for procurement, fabrication (including pipe‑bending machines) and on‑site installation where unambiguous 3D representation is necessary.
• Standardizing how pipeline assemblies are communicated across engineering, fabrication and construction teams.

Who uses this standard

• Piping designers and engineers
• CAD technicians and drafters producing isometrics
• Plant and mechanical engineering firms
• Fabricators, erection contractors and machine programmers
• Procurement and quality teams relying on consistent technical product documentation

Related standards

• ISO 6412-1 (General rules and orthogonal representation)
• ISO 128-20 (Presentation)
• ISO 129-1 (Dimensioning and tolerances)
• ISO 3545-1, ISO 5261 (symbols and simplified representations)

Using EN ISO 6412-2:2018 ensures consistent, industry‑accepted isometric projection of pipelines, improving communication and reducing errors in pipeline design, fabrication and installation.