tender for supply of miscellaneous materials for maintenance of different r.l.i schemes under kalyani (agri-mechanical) division , kalyani,nadia , supply of 150 mm dia nominal bore pvc flexible suction & delivery hose pipe (heavy duty) specifications : ld: min. 151 mm. 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/cm² 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.