tender for renovation and augmentation work of old ipd block at rims, ranchi , hdpe pipe , providing, laying and joining in position hdpe dwc(doublewall corrugated) and conforming to i.s.16098 of required grade sn-4/sn-8 and suitable for the respective working pressures with all fittings and specials,e.g.couplings, tees,bends,reducers, screwed adapters, flanged tail pieces, etc., jointing as per manufacturers recommendations,all complete including trenching,backfilling & pressure testing etc. (for sewer line). as per approved design,specification and direction of e/i. , (a) 150 mm dia pipes , (a) 250 mm dia pipes , (a) 300 mm dia pipes , (a) 400 mm dia pipes , (a) 600 mm dia pipes