A Technical Bulletin just issued by the National Certified Pipe Welding Bureau (NCPWB) concerns failures in seamless carbon steel pipe, fittings and flanges during hydrostatic testing due to changes in steelmaking practices by certain mills over the last five years. The Bulletin recommends that, except when the piping system hydrostatic test pressure is less than 20% of the code maximum allowable pressure, contractors should include a requirement in their purchase orders that seamless carbon steel pipe, fittings and flanges have a manganese-to-carbon ratio of 5:1 or greater and a grain size of 7 or finer to avoid such failures. Find out more by clicking on the link below.
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