particular specifications (road works) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 474 c) Rubber rings shall be lubricated before making the joint and the lubricant shall only be soft soap water or an approved lubricant supplied by the manufacturer. d) In case of R.C. pipe entering or leaving a manhole a flexible joint may be provided atleast within 0.60 M from the outer end of the manhole. e) A drop in water level of not more than 50 mm in one hour shall be permitted, in case of hydraulic test of manhole. 30.0 ALL WORKS TO BE WATER TIGHT a) The drains, manholes and all joints of pipes must be made thoroughly sound and water tight and any joint which may be proved to be leaky at any time during the progress of works or during the contractors subsequent period of maintenance shall be immediately made sound by the contractors at their own expense. The contractors, when required by the Engineer shall at their own cost prove all works to be water tight by filling it with water to such height as the Engineer may determine. Any additional precautionary measures or appliances that may be found necessary to ensure the water tightness of the manholes, flush stains, disc plugs in junctions and the joints of pipes shall be adopted by the contractor without extra charges, the responsibility of making them when completely water tight resting upon the contractor. b) Immediately after the test with the double disc or cylinder as mentioned in Clause No. 41.0 has been completed and any defect hereby disclosed have been made good the contractor shall prove the joints of the stretch of the under ground pipe whether of
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 475 stoneware, cast iron or R..C. pipes, to be water tight by filling in pipes with water before filling in the trenches to the level of 1.5 M above the top of the highest pipe in the stretch and heading the water up for the period of one hour or such further time as the Engineer may direct. The apparatus used for the purpose of testing shall be approved by the Engineer. The contractor, if required by the Engineer, shall pump the excavation dry and keep it so during the period of testing. No test applied to part of a stretch when adding water from a measuring vessel at regular 10 minutes interval, and noting the quantity required to maintain the original water level. For the purpose of this test the average quantity added should not excess 1 litre / hour / 100 linear metres /10 mm of nominal internal diameter). c) Any leakage including excessive sweating which cause a drop in the test water level will be visible and the defective part of the work should be removed and made good. In the case of cast iron rising mains, they shall be tested for a safe pressure as directed by the Engineer. The manholes when they have been raised above the highest subsoil water level expected in the monsoon shall similarly tested for water tightness as for the pipe lines. The procedure for this shall be as follows. The mouths of all pipes entering the manholes shall be suitably plugged with brick, or wooden any other type of plug. The manhole under test shall then be filled with water upto the general subsoil water level and observed for a period of one hour. If the level dose not drop by more than 50 mm in one hour, it shall be assumed that the manhole is tight.
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