The pvrpose of this standard the following

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Unformatted text preview: 2.1 Working Pressure - It is the maximum sustained internal pressure excluding abnormal conditions such as surge ( water hammer >, to which the pipeline may be subjected when in use. NP4 Reinforced concrete, heavy-duty, nonpressure pipes For drainage and irrigation use, for carrying culvert heavy traffic, such as, railway loading Pl Reinforced concrete pressure pipes tested to a hydrostatic pressure of 0.2 MPa ( 20 m head ) For use on gravity mains, the site test pressure not exceeding two-thirds of the hydrostatic test preSsure p2 Reinforced concrete pressure pipes tested to a hydrostatic pressure of 0’4 MPa ( 40 m head ) For use on pumping mains, the site test pressure not exceeding half of the hydrostatic test pressure ~3 Reinforced concrete pressure pipes tested to a hydrostatic pressure of 0’6 MPa ( 60 m head ) 2.2 Site Test Pressure - It is the pressure to be applied to the pipeline or sections thereof, after laying, to test its strength and watertightness. NOTE -The site test pressure to be imposed will have to be determined when placing orders for pipes and fittings. in general, this pressure should not be less than the maximum pipelines operating pressure plus the calculated surge pressure but in no case should exceed the hydrostatic test pressure. 2.3 Hydrostatic Test Pressure - It is the maximum pressure which the pipe can withstand without any leakage when tested for hydrostatic pressure in accordance with this standard and IS : 3597-1985l. 2.4 Surge ( Water Hammer ) Pressure - It is the pressure which is produced by a change of velocity of the moving stream and becomes maximum when there is a sudden stoppage which may be caused by the closing of a valve or by shutting down a pump station. 3. CLASSIFICATION shall be classified as under: of test for concrete do NOTE-The uses are only by way of recommendations as a general guidance and the exact usage shall be decided by the engineer-in-charge. 3.1 For the purpose of this standard, concrete pipes IMethods for rounding off numerical values ( revisecij. 3.2 Unreinforced and reinforced concrete non-pressure pipes shall be capable of withstanding a test pressure of 0’07 MPa ( 7 m head ). pipes (first revision ). 2 IS : 458 - 1988 4. MATERIALS 4.5.1 The concrete for non-pressure pipes shall have a minimum cement content of 360 kg/& and a with the requirements given in 4.2 to 4.6 shall be minimum compressive strength of 20 N/mm2 at 28 days. If mortar is used, it she’ll have a minimum used. cement content of 450 kg/m3 and a compressive 4.2 Cement - Cement used for the manufacture of strength not less than 20 N/mm2 at 28 days. The unreinforced and reinforced concrete pipes shaI1 concrete for pressure .pipes shall have a minimum conform to IS, : 269-1976’ or IS : 455-19762 or cement content of 450 kg/m3 and a minimum comIS : 1489-1976’ or IS : 8041-19784 or IS : 8043-1978’ pressive strength of 25 N/mm2 at 28 days. If mortar is or IS : 8112-1976e. used, it shall have a minimum...
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This document was uploaded on 10/01/2013.

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