sentences:  Due to the nature of the gas all carbon steel piping had to comply with NACE Specification MR 01 75 (90) which required limits on sulphur and carbon content.The gas supply line from the PGRF was installed by Motherwell Bridge Projects from 1990 to 1991.The piping system consisted of carbon steel piping ranging from 30" to 20" fully welded and tested producing a high integrity system.