Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

12.17.6 HandlingFollowing Recommendations shall be followed while handling the pipes:Adherence to National Safety requirementsPipes to be smoothly lowered to the groundPipes should not be dragged against the ground to avoid the damages tothe Coupler/pipes.800mm and larger diameter pipes are carried with Slings at two pointsspaced approximately at 3 Meters apartFor smaller diameters (400mm 800mm) one lift point shall be sufficient &can be handled either manually or mechanicallyDo not use a loading Boom or Fork Lift directly on or inside pipe.12.17.7 Pipe Storage at SiteStockpiling shall be done temporarily on a Flat Clear Area as per Fig. 1 & 2.For avoiding collapse of Stacks, use Wooden Posts or BlocksStacking shall not be higher than 2.5 MetersWhile stacking, alternate the socket/coupler ends at each row of stackedpipes as per Fig. 2.Fig 1 Fig 212.17.8 Lowering, Laying & jointing of PipesThe width of a Sewer Trench depends on the soil condition, type of sideprotection needed and the working space required at the bottom of Trench forsmooth installations. Increase in width over required minimum would undulyincrease the load on pipe and cost of road restoration. Considering all abovefactors, the Minimum Trench Width is specified as per Table below :-Indicative Minimum Trench Widths **Pipe Diameter (mm)Trench Width (M)75-170 0.6250 0.7400 0.9600 1.2800 1.31000 1.8** In actual practice the trench width can be as narrow as possible butadequate to allow the workmen to execute the job satisfactorily.The pipe segment between two manholes shall be laid approximately instraight line without any vertical undulations. However, on the strength of itsflexibility, the DWC PE Piping system can be laid in very smooth curve if foundUrban Administration & Development Department Page 144