The International Organization for Standardization (ISO). Sixth edition. 2009-12-15. This sixth edition cancels and replaces the fifth edition (ISO 2531:1998), of which it constitutes a technical revision. 78p. This International Standard specifies the requirements and test methods applicable to ductile iron pipes, fittings, accessories and their joints for the construction of pipelines:
- to convey water (e.g. for human consumption and raw water),
- operated with or without pressure, and
- installed below or above ground.