annual maintenance contract of solar water heating system and spare parts for department dsw , ccs hau , hisar , purchase of amc of solar water heating system and spare parts for the department of dsw , ccs hau , hisar . below mentioned quantity of items may increase or decrease according to requirement of the site , amc of solar water heating system n various hostels decaling and cleaning , stainless tank 1000 ltr . capicity , hot water insulating pipeing b class isi marked duly insulated with 50mm thick insulation and cladding with 28 swg al sheet: 20mm i/dia , hot water insulating pipeing b class isi marked duly insulated with 50mm thick insulation and cladding with 28 swg al sheet: 25mm i/dia , hot water insulating pipeing b class isi marked duly insulated with 50mm thick insulation and cladding with 28 swg al sheet: 15mm i/dia , only reinsulation of piping: 15mm i/dia , only reinsulation of piping: 20mm i/dia , only reinsulation of piping: 25mm i/dia , float valve with ball comp: 20mm i/dia , float valve with ball comp: 25mm i/dia , collector 100 ltr capacity as per bis standard make solchrome to the satisfaction of the committee and equal standard: collector glss of standard size , collector 100 ltr capacity as per bis standard make solchrome to the satisfaction of the committee and equal standard: alu beading of ai angle , collector 100 ltr capacity as per bis standard make solchrome to the satisfaction of the committee and equal standard: rubber gaskit , collector 100 ltr capacity as per bis standard make solchrome to the satisfaction of the committee and equal standard: collector repair insulation , gate valve/ball valve: 20mm i/dia , gate valve/ball valve: 25mm i/dia , air vent pipe 15mm/20mm , flange , air pipe welding , gi tee 25mm , gi socket 25mm , gi elow 20mm , gi socket 20mm , gi elbow 25mm , gi union 20 mm , gi union 25mm , tank insulation charges 1000 ltr capacity