PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

Where joints are left uncovered until after testing, sufficient materials should be
backfilled over the centre of each pipe to prevent movement under the test pressure.
The contractor shall make his own arrangements to procure necessary equipments,
apparatus etc., required for testing and shall provide necessary labour for filling
with water the length of pipes to be tested, fixing all apparatus and for carrying on
the testing operations until the length of pipe, specials and connections are firmly
passed by the Engineer. If the testing apparatus and equipments are available with
the employer, they can be hired by the contractor at usual conditions and charges.
The length to be tested shall be provided with two blank flanges fastened on the
usual manner by collar bands and bolts to the end pipes or if the length to be tested
shall have a sluice valve at each end, such blank flanges may be dispensed with.
The length of pipes to be tested shall first be filled in with water from a higher
section of pipes already laid or with clean water obtained from a service connection,
as the contractor may arrange with the approval of the Engineer.
Before the actual testing pressure is applied, any air which has logged in the length
of pipe to be tested shall be got rid of, by screwing on at the highest part of the
length of pipes or temporary air valve, or by opening a temporary stop-cock or by
other means as the Engineer may direct.
The test pressure shall not be less than 10 kg/cm 2 .
Each pipeline or section thereof, shall be filled with water and all air removed. The
pressure in the pipelines shall be raised steadily until the site test pressure is reached
in the lowest part of the section. This pressure should be maintained, by pumping if
necessary, for a period of not less than 1 hour. The pump should then be
disconnected and no further water permitted to enter the pipeline for a period of
1 hour. At the end of this period, the reduced pressure in the pipeline should be
measured, the original test pressure restored by pumping and the loss measured by
drawing off water from the pipeline until the pressure has fallen to match the
reduced pressure previously noted. The loss shall not exceed 0.02 litre per mm
diameter per kilometer per 24 hours for each bar of head applied. If the pipeline
fails to pass the test, the faults shall be located and repaired and the pipeline retested
until it passes the pressure test. All exposed pipe, fittings, valves and joints shall be
visually inspected during the tests.
If the length of pipeline under test is found to be satisfactory and no leaks or
sweating are found at the pipe joints or at the joints of specials and connections,
then this length of pipeline will be passed by the Engineer.
But should any pipe, joint, special or connection be found to sweat or leak,
contractor shall make good at his cost such defective joints and the length of pipe
line shall be retested until all pipes, joints specials and connections are found to be
satisfactory.
GTS : General Technical specification. Page 89