S/S‐lined Gas Mains. Darchem Engineering Ltd. of Stillington, Stockton‐on‐Tees, a member of the Darlington Chemicals Ltd. group, has completed an order for the supply of 180 ft. of 54‐in.‐diam. mild steel gas mains lined with stainless steel. These mains are being supplied to Simon‐Carves Ltd. for Techmash‐import, Moscow.