1. Scope

Keywords

Rationale

Steel and other ferromagnetic materials are used to manufacture line pipe for pipeline applications. Too much residual magnetism causes unwanted ferromagnetic particles to adhere to the ends of the pipe segments which interferes with the smooth connection of pipe segments and can result in difficulty connecting pipe segments or leakage at the joint. Techniques are used to demagnetize segments prior to shipment, but residual magnetism can build up during transport and handling. This practice explains the nature of the magnetic problem and details types of measuring equipment suitable to quantifying residual magnetism and how to use that equipment properly.