a TABLE OF CONTENTS - UNDP

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Crushing Test Loads of Reinforced Concrete Pipes
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Nominal Internal Diameter
Load
of Pipe (mm)
(kN/linear metre)
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600 105
700 105
800 140
900 155
1000 175
1200 210
1400 225
1600 270
1800 310
2000 350
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In the event that the minimum crushing test requirements are not satisfactory
and upon the approval of the Engineer and at his discretion, the pipes shall
then be protected by encasing them in (250 kg/cm2) concrete in accordance to
Concrete Work of these Specifications and the engineer's instructions. The
thickness of concrete encasement shall be sufficient to obtain the same
minimum crushing strength requirements but shall not be less than 150 mm.
No additional payment shall be made in lieu of this work other than that for
the pipes at the rates indicated in the Bill of Quantities. The Contractor shall
not be entitled to claim for an extension of time with respect to this work.
All pipes and fittings shall be marked indelibly after manufacture. The
markings shall include:
(a)
(b)
(c)
Name of Manufacturer.
Date of manufacture and serial number.
Nominal diameter.
Nominal diameters shall refer to internal diameters of pipes.
The tolerances of the nominal diameter of pipes shall be ±5 mm for 250 to
500 mm nominal diameter, ±10 mm for 600 to 1000 mm nominal diameter
and ±15 mm for 1200 to 2000 mm nominal diameter.
The tolerance on the length of an individual pipe shall be ±20 mm. The
checking of dimensions and tolerances shall be done with special gauges
approved by the Engineer, to be supplied by and at the expense of the
Contractor.
All pipes manufactured in accordance with BS 5911 shall be tested and
certified in accordance with the requirements of BS 5911. All rejected pipes
shall be promptly stamped "Rejected" in a conspicious location on the pipe.
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