Volume-II of IV - GAIL

area on the pipe shall show presence of adhesive. Disbondment/
separation at epoxy to steel interface or epoxy/ adhesive interface or
adhesive/ polyethylene interface shall not be permitted. The failure mode
shall be recorded for each test.
c. In case the above tests do not comply with the above requirement,
CONTRACTOR shall test all the preceding and succeeding coated pipes. If
both pipes pass the test, then the remainder of the pipe joints in that
shift shall be deemed satisfactory. If either pipe fails to meet the
specified requirements, all pipes coated during the shift shall be tested
until the coating is provided acceptable. Rejected coated pipes shall be
stripped and re-coated in accordance with approved procedure, at
CONTRACTOR’s expense.
d. The frequency of bond strength test as per para 10.5(b) for cut back
portion may be reduced depending upon the consistently of result to one
pipe in every twenty five(25) instead of every fifteen pipes, at the sole
discretion of the COMPANY Representative.
10.6 Impact Strength
a. Impact resistance test shall be conducted as per clause 5.3.3 (b) of this
specification. Initially the frequency of test shall be 2(two) coated pipes
per shift, which may be further reduced and/ or waived depending upon
consistently acceptable results at the sole discretion of COMPANY’s
representative.
b. Minimum thirty(30) impacts located equidistant along the length of
coated pipe shall be performed.
c. Immediately after testing, the test area shall be subjected to holiday
detection at the same voltage as used prior to impact strength test. The
pipe shall be rejected if any holiday is noted in the test area.
d. In case of test failure, retesting and disposal of coated pipe shall be as
per 10.5(c) above.
10.7 Indentation Hardness
a. Indentation hardness test shall be as per clause 5.3.3 (c) of this
specification. The frequency of test shall be initially 2(two) coated pipes
per shift which shall be further reduced to one test each on 2 coated
pipes per week at random after 1 week of consistently acceptable results.
Two samples for each temperature shall be taken from the cut back
portion of coated pipe and one in middle of the pipe for this test.
b. In case of test failure, retesting and disposal of coated pipe shall be as
per 10.5(c) above.
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