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Unformatted text preview: PIPES ( WITH AND WITHOUT
( 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
( 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
IS 458:1988 SPEClFICATION FOR PRECAST CONCRETE
PIPES (WITH AND WITHOUT REINFORCEWENT)
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
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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- Fall '13