This British Standard is an adoption of an ISO standard. You can access the ISO version here.
ISO 15590‑4 specifies the technical delivery conditions for bends made by the cold bending process for bend with radii 5xOD or higher for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623.
ISO 15590‑4 also specifies the requirements for the manufacture of two product specification levels (PSLs) of cold bends corresponding to product specification levels given for pipe in ISO 3183. ISO 15590‑4 is applicable to cold bends made from seamless and welded pipe of unalloyed or low-alloy steels.
Note: ISO 15590‑4 is not applicable to the selection of the cold bend product specification level. It is the responsibility of the purchaser to specify the PSL, based upon the intended use and design requirements.
ISO 15590‑4 is not applicable to field cold bends and pipeline bends made by other manufacturing processes.
ISO 15590‑4 -factory cold bends is useful for:
Factory cold bends, fabricated using manufacturing procedure specifications (MPS), are useful in onshore pipelines for the transmission of energy (hydrocarbon) and water resources.
Bend qualification test as specified in ISO 15590‑4 helps produce a cold bend in accordance with the MPS and demonstrates that bends meet the specified requirements.
ISO 15590‑4 provides you various test methods to ensure that the pipes can tolerate significant amount of bending deformation and external pressure in various applications.
ISO 15590‑4 helps you ensure structural integrity of such onshore and offshore areas and also protection against geohazards.
ISO 15590‑4 allows you to accurately predict structural performance of pipeline transportation system.