Volume-II of IV - GAIL

Company Representative reserves the right to ask for additional measurement at
any location on the field joint coating, whenever doubt arises.
5.4 Peel Strength Testing
5.4.1 One out of every 50 joint coatings or one joint coating out of every day’s
production whichever is stringent shall be tested to establish the peel strength on
steel and factory applied coating. Contractor shall carry out such testing in the
presence of Company Representative.
5.4.2 From each test sleeve selected as above, one or more strips of size 25mm x
200mm shall be cut perpendicular to the pipe axis and slowly peeled off.
The required peel strength shall meet the requirements of this specification as
applicable for (+) 23°C or (+) 60°C whichever is feasible. This test shall be
conducted between wrapping & metal and mill coating & between layers at overlap
with joint coating (wherever applicable). After removal of strip, the bulk of
adhesive shall remain adhered to the pipe showing no bare metal, otherwise, test
shall be considered failed. The adhesive layer that remains on the pipe surface
shall generally be free of voids resulting from air or gas inclusion. In case the peel
strength test at a different temperature than that specified in warranted due to the
ambient site conditions, then the peel strength shall comply the recommendation of
the manufacturer. Manufacturer shall be asked to furnish peel strength values
corresponding to various expected temperatures, prior to start of the works.
5.4.3 If the sleeve does not meet the requirements of clause 5.4.2 the adjacent two
sleeves shall also be tested. If the adjacent two sleeves are acceptable the test rate
shall be increased to one sleeve every twenty five until Company’s Representative
is satisfied. The test rate can then be reduced as per clause 5.4.1. If either or
both of the adjacent two sleeves do not meet the requirements of clause 5.4.2, the
field joint shall be stopped.
5.4.4 Company Representative reserve the right of 100% removal of sleeves if he is not
convinced that the requirements of clause 5.4.2 are achieved.
6.0 REPAIRS
6.1 If a field joint is detected to be unacceptable after testing as per section 5.0 of this
specification the Contractor shall, at his own cost :
- Determine the cause of the faulty results of the field coating.
- Mobilise the expert of manufacturer, if required.
- Test to be complete satisfaction of the COMPANY, already completed field
coatings.
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