Satisfied the requirements given in 1021 for ultimate

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Unformatted text preview: PIPES ( WITH AND WITHOUT REINFORCEMENT ) ( Third Revision ) ( Page ii, clause 0.3.2 ) - Insert the following new clause after 0.3.2: ‘0.3.3 Because of increase in barrel wall thickness of class NP2 pipes of internal diameter 600 mm to 1 200 mm, both nominal and actual internal diameters have been specified for class NP2 pipes in order to accommodate the existing mouids. As it has been desired that all non-pressure pipes should have flexible rubber ring joints after 1995, the manufacturers should gradually change their moulds suitable for manufacturing such pipes and atfer 1995 nominal internal diameters should be treated as actual internal diameters.’ ( Page 3, clause 4.5.2, line 3 ) the words ‘shall be’. Insert the words ‘not less than’ after ‘.. ( Page 3, clause 4.6 ) - Substitute ‘Type 1 A of IS 5382 : 1967’. ( Page 3, foot-note No. 4 ) - (CED ‘Type 2 of IS 5382 : 1985’ for Insert ‘( second revision )’ at the end. 2) Printed at Simco Printing Press, Delhi, India _~_~__~_____-. T _.---. .--- - __ -. APRIL 1991 AWENDWENT NO. 2 TO IS 458:1988 SPEClFICATION FOR PRECAST CONCRETE PIPES (WITH AND WITHOUT REINFORCEWENT) (PMrd Revisfon) CPa&re 1, clause 0.3.1 the existing matter: (c)l - Substitute the following for ‘c) In this revision a new classification of pipes has been followed. In respect of strength test, the new classes compare with the old classification as follows: Class NPl Same as class Class NP2 Equivalent standard Class NP3 New class introduced in this revision Class NP4 Equivalent to class earlier standard Class Pl,P2 and P3 Same as class Pl,PZ and P3 of earlier standard to NPl of earlier class standard NP2 of earlier NP3 and NP4 of Longitudinal and spiral reinforcement for different classes of pipes and three edge bearing test load of class NP2 pipes have been modified in this revision.* Reinforcement to be provided in socket of different classes of pipes for rubber ring joint have also been included. Pipes suitable for railway loading are not included in this standard at present and this might be included at a later stage. The present class NP4 pipes shall not be used for railway loading.' (Pagt? 2, clause 1.1) - Insert the following at the end: ‘The requirements for collars are also covered by this standard. NOTE - In addition to the requirements specified specifically for the collars, the requirements given in the following clauses shall also apply for collars: 4.2, 4.3, 4.4, 4.5, 4.5.1, 4.5.3, 4.5.4, 6.1, 6.2, 6.2.1, 6.2.2, 6.3, 6.3.1, 6.4,7.2, 8.1, 8.1.1, 8.1.2, 8.1.3, 8.1.4, 11.1 and 11.1.1.' (Page from 2, clause 3.lj - Delete 'scch as, railway loading' line 16 and 17 of column 3 of the informal table. (Page 3, clause 4.3) - Substitute the following for the ex- isting clause: '4.3 Aggregates - Aggregates used for manufacture of unreinforced and reinforced concrete pipes shall conform to 3 of IS 383:19707. The maximum size of aggregate 'should not exceed one third the thickness of the pipe or 20 mm, w...
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