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

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

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

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13.6.6.1 The number of defective pipes (those not satisfying one or more of therequirements for dimensions, finish <strong>and</strong> deviation from straight) shall not bemore than the permissible number given in column 3 of Table 9 of IS: 458.13.6.6.2 All the pipes tested for various tests satisfy corresponding requirements of thetests.13.6.6.3 In case the number of pipes not satisfying requirements of any one or moretests, one or two further sample of same size shall be selected <strong>and</strong> tested forthe test or tests in which failure has occurred. All these pipes shall satisfy thecorresponding requirements of the test.13.7 Marking :13.7.1 The following information shall be clearly marked either on pipe or on collar.13.7.2 Name of manufacturer:13.7.3 Class <strong>and</strong> size of pipe/collar;13.7.4 VIBRATED CAST PIPE (UNREINFORCED) ORVIBRATED CAST PIPE (REINFORCED) as may be applicable, for pipes: <strong>and</strong>13.7.5 Date of manufacture.13.7.6 Marking shall be clearly marked on outside only for pipes upto <strong>and</strong> including350mm internal diameter & both outside <strong>and</strong> inside for pipes above 350mminternal diameter. The information shall be clearly marked on the outside forcollars.13.7.8 Each pipe / collar may also be marked with the St<strong>and</strong>ard Mark.13.8 H<strong>and</strong>ling <strong>and</strong> laying of pipes(See Drawing No.-9)13.8.1 Reasonable care shall be exercised in loading, transporting <strong>and</strong> unloading ofconcrete pipes. H<strong>and</strong>ling shall be such as to avoid impact. Gradual unloadingby inclined plane or by chain block is recommended.13.8.2 If the sides of the trench are not vertical, the toes of the side slopes shall end atthe top the pipe, <strong>and</strong> practically vertical sided trench shall be dug from thesedown to the sub grade.13.8.3 Trench shall be of sufficient width to provide a free working space on each sideof the pipe. The free working space shall be, preferably, not more than onethirdof the diameter of the pipe <strong>and</strong> not be less than 15cm on either side.13.8.4 Pipes shall be lowered into the trenches carefully. Mechanical appliances maybe used.13.8.5 Pipes shall be laid true to line <strong>and</strong> grade as specified.13.8.6 Laying of pipes shall always proceed upgrade on a slope. If the pipes havespigot <strong>and</strong> socket joints, the socket ends shall face upstream. In the case ofpipes, with joints to be made with loose collars, the collars shall be slipped onUrban Administration & Development Department Page 153

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