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Unformatted text preview: s conforming to
IS: 8041-1978', IS : 8043-1978' and IS:
8112-197(j4 for the manufacture of concrete
pipes; Modification in the length of pipes allowing
the manufaoturer to declare the effective
length which shall be between 1.0 and 4’0 m; b) Allowing the use of wire fabric conforming to IS : i566-1982”, deformed bars and wires Tode
revision of pra&ce pipes Modification in di’fferent design requirements
of the pipes; (first for rapid hardening Inclusion of larger diameter pipes for all
classes of pipes except for class NPl and PI; Portland cement (firs: ). Gpecitication
revision of concrete ). Vjpecitication
revision for laying for hydrophobic Portland cement (firsr ). ‘Specification
for high strength deformed steel bars
and wires for concrete reinforcement
( third revision ).
ZSpecification for structural steel ( standard quality )
revision ). Yjpecification for 43 grade ordinary Portland cement.
steel wire fabric for
concrete reinforcement ( second revision ). 1 IS :458 -1988 k) Inclusion of a clause on repair of pipes; and
pipes. should be treated as actual internal diameters with
tolerances specified in this standard and such moulds
should be made suitable for manufacturing pipes
with flexible rubber ring joints. in sampling and inspection of 0.3.2 In order to accommodate the existing
moulds used by rhe manufacturers for manufacturing
class NP3 pipes given in the earlier standard, the
diameters of class NP3 and NP4 pipes in this
revision have been given as nominal internal
diameters. The actual internal diameters of these
pipes are, therefore, to be declared by the manufacturers.
However, the manufacturers should
gradually change their moulds as it has been desired
that after 1995, these nominal internal diameters 0.4 For the purpose of deciding whether a particular
requirement of this standard is complied with, the
final value, observed or calculated, expressing the
result of a test, shall be rounded off in accordance
with IS : 2-196Ol. The number of significsnt places
retained in the rounded off value should be the same
as that of the specified value in this standard.
IRules Class 1.2 Prestressed concrete pipes and pipes with noncircular section are not covered by this standard. Conditions Where
Normally Used Unreinforced
pipes For drainage and
irrigation use, above
ground or in shallow
trenches Np2 1.1 This standard covers the requirements for reinforced and unreinforced precast cement concrete
pipes, of both pressure and non-pressure varieties
used for water mains, sewers, culverts and irrigation. Description NP1 1. SCOPE Reinforced concrete,
Jight-duty, aon-pressure pipes For drainage and
For drainage and
medium traffic 2. TERMINOLOGY Np3 i Reinforced concrete,
nonpressure pipes 2.0 For the pvrpose of this standard, the following
definitions shall apply....
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This document was uploaded on 10/01/2013.
- Fall '13