procurement of di pipes for laying of 150mm diameter distribution pipe line from proposed semi underground reservoir cum booster pumping station at middle road in ward no.104 br-xi. procurement of di pipes for laying of 150mm diameter distribution pipe line from proposed semi underground reservoir cum booster pumping station at middle road in ward no.104 br-xi. , d.i pipe spun ( class k-7 ) 150 mm dia ( tyton joint ) conforming to is:8329 / 2000 class k-7 suitable for push-on-joint ( rubber gasket joining ) with inside cement mortar lining and outside bituminous / synthetic resincoating compatible with the metallic zinc coating as per clause a-8 .