retrofitting works related to fhtc at different places of barnes pwss under jalpaiguri division, p.h.e. dte - supplying hdpe ( materials grade pe-100 ) pipes conforming to is 4984. 1995 with latest revision & amendments if any with necessary hdpe specials ( excluding cost of cidf valves ) including labour charges for earth work in excavation in any kind of soil including mixed soil with boulder, road sub-grade and aits flank but excluding moorum laterite or sand stone $ hard rock cutting with chisel required including cutting road flank! brick pavement etc. without damaging the exisiting telephonelelectrical cable line etc. ( in case of damage ofanytype of cable line bythe agency at the time of execution necessary damage charge as applicable by the respective authority will have to be brone by the 1 .00 agency at his own cost ) upto the depth ( av. ) so as to maintain 1.10m.earth cushion from top of the pipe upto o.l including loading unloading carrying lowering laying fitting fixing carefully pipes, valves and specials with the all types of jointing materials in trenches maintaining proper levels and alignment jointing the pipes and specials by bull welding! adopting suitable method ( but weld jointing with help of hydraulic tack and trimming machines, hitter etc. for reaching at necessayy melting point of hdpe pipe so that joint can be monolithic ) so as to facilitate the maintenance of pipe line locally as per conventional method in future. ( a ) pressure rating pn 6. ( ii ) laying of pipe line including cost of pipe & special sf fittings only 1 .01 excluding cost of valves. i ) l 60 mmdia cleaning thoroughly the inner surface of pipe line including specials and valves by flushing with water and subsequently disinfection of the same pipe line by flushing again with water containing bleaching powder resulting in residual chlorine not less than 1 5mgfltrs. after 24hrs. of such filling including laboratory 2.00 testing or water samples obtain from the disinfested pipe line and disposal of water from the pipe line after completion of the work the rates including of cost of requisite waterto be arranged by the contractor ) ( the rate of water @rs. 1 0!m3 may be recovered, if the contractor used water from deptt. source ) . 160 mm dia 2.01 filling the pipe line with water, testing hydraulically as per 1.3 311-4-1965 ( article-6 ) in section of a length not exceeding 500mtr. for head of pressure as per specification including supplying installing and fixing all equipments such as diesel pump set blank flange, pressure gauge, valve, pressure pump and all other tools and plants including drilling topping and plugging of necessary holes to pipes, blocking ends providing temporary 3.00 thrust block and subsequent blocking or holes and other jointing materials and dismantling and removal of the same including disposal of water etc. all complete as per specification and direction of eic. the rate is inclusive of cost of requisite water to be arranged by the contractor ( recovery rate of water rs.1 0.001m3, if contractor used water from deptt. source ) .i ) 1 60mm dia