supply delivery of pvc flexible suction delivery hose pipe for maintenance of different major rli schemes under howrah(a-m) sub-division under howrah(a-m) division under non plan programme. , 1.supply of 150 mm dia nominal bore pvc flexible suction & delivery hose pipe (heavy duty) specifications : id: min. 151mm, max. 152.4 mm, wall thickness : min. 7.5 mm, max. 8 mm, pitch of spiral : uniform with tolerance ±2% and reinforcement no. 75 ± 5 per mtr, coil length : 20 mtr., colour : green or gray., hydro static proof / working pressure test : 4 kgf/sq.cm at 27±2 °c for 5 min., hydro static burst pressure test : 8 kgf/sq.cm at 27±2 °c for 1 min., resistance to vacuum : 625mm of hg (approx)., loss in mass on heating : < 3% of mass of the sample subject to heating at 130±3 °c for a period of 3 hours.