Discussion of Standards for Oil ＆ Gas Linepipe

Based on years' experiences of oil and gas linepipe production,the standards for such products are discussed. As a result,proposals for supplements to certain contents of the standards are put forward,covering such aspects as guided-bend test,lot sampling for physical-chemical property tests,inclusions,yield to tensile ratio,minimal chemical composition,metal Vickers hardness test,radial offset,misalignment and hydrostatic test pressure etc.