Special and pipe the special shall be jointed to the

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Unformatted text preview: f joint with mortar. This is allowed only upto working pressure of 3 kg/cm2. 11 JOINTS 11.1 Unless specified otherwise, jointa between pipes shall be of the spigot and socket type, so manufactured, that when fitted with the correct $ize rubber Non-pressure pipes for drainage, sewerage and culverts, shall be tested for 0.14 N/mm2. 7 IS 784:2001 13.3 Permeability 13.6 Repair of Core and Coat Test on Coating Pipes not satisfying any of the tests, which may be arising due to occasional imperfection in manufacture or damages during handling, may be treated / repaired and shall be accepted if they satis~ the tests. The curing of the repaired concrete or mortar maybe done using curing compound. The drop of water level, in the specimens of pipes selected, when tested according to the method described in IS 3597 shall not exceed 2 cm3 at the end of two hours and the final permeability between fourth and fifth hour shall not exceed 0.3 cm3. When a higher result is obtained, the test shall be repeated on twice the number of pipes originally tested and the lot shall be accepted, if all pipes pass the test. Where retest is not satisfactory, all pipes from that lot may be tested individually and only those with satisfactory results shall be accepted. No additional treatment of any type shall be allowed on the pipe before permeability testis done. 14 SAMPLING ACCEPTANCE CRITERIA FOR 14.1 Pressure Pipes for Water Supply and Sewerage Basic requirement, unless the design proving and manufacturing process test in 13.1 is satisfactorily carried out, no acceptance tests shall be undertaken. This has to be done for every new diameter of pipe and for one pressure. The criteria for acceptance is the final permeability. The test shall be done immediately after the hydrostatic factory test. In case this is done later, the pipe shall be kept wet for 48 hours prior to test. All the pipes manufactured under relatively similar conditions in respect of raw-materials and processing operation, shall be grouped together to constitute a lot. 13.4 Three Edge Bearing Test (for Pipes for Drainage, Sewerage AND and Culverts) Pipes designed for drainage, sewerage and culverts when subjected to three edge bearing test in accordance with IS 3597 shall meet the requirement as given in Table 2. Each lot shall be taken separately for sampling and evaluation, for conformity to the requirements of this standard, if the conditions mentioned in 5.1, 5.2,5.3, 11.1, 11.2 and 12.2 are satisfied (even after repairs). Scale of sampling shall be as given in Table 3. 13.5 Dimensional Characteristic The pipe selected shall be checked for conformity to the dimensional requirements as given below: 14.2 For non pressure pipes for drainage, sewerage and culvert, only permeability test from Table 3 besides dimensions and three edge load bearing test is necessary. a) Socket and spigot diameters of the pipes as given by manufacturer. b) Dimensional requirements as given in 5. Table 2 Three Edge Bearing Test Loads...
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This document was uploaded on 10/01/2013.

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