Volume-II of IV - GAIL

steel debris. Glass transition temperature differential (∆Tg) and % cure
(∆H) shall comply the specified requirements.
b. Epoxy Layer Thickness
Epoxy layer thickness shall be checked at every one meter spacing at 3,
6, 9 and 12 o’clock positions. The thickness shall comply the specified
thickness requirements.
c. Adhesive Layer Thickness
Adhesive layer thickness shall be checked at every one meter spacing at
3, 6, 9 and 12 o’clock positions. The thickness shall comply the specified
thickness requirements.
d. Holiday Inspection
Entire pipe shall be subject to holiday inspection and the test voltage
shall be set to exceed 5 v/micron of epoxy thickness specified for the
portion coated only with epoxy layer.
e. Adhesion Test
i) Adhesion Test (24 hrs or 48 hrs) shall be carried out on the epoxy
coated pipe. Test method, no. of test specimen and acceptance
criteria shall comply CSA Z.245,20-98, Table 4.
ii) Adhesion of FBE shall also be separately determined at ambient
temperature at two locations by the “St Andrews Cross” method
and the test shall comply with the specified requirements.
f. 2.5° Flexibility Test
2.5° Flexibility test shall be carried out on the epoxy coated pipe at test
temperature of 0°C. Test method, no. of test specimen and acceptance
criteria shall comply CSA Z.245,20-98, Table-4.
g. Cross-section & Interface Porosity Test
Cross section porosity and interface porosity tests shall be carried out on
the epoxy coated pipe. Test method, no. of test specimen and
acceptance criteria shall comply CSA Z.245,20-98, Table-4.
7.5.2 Tests on pipes coated only with all three layers
a. Bond Strength
Three test pipes shall be selected for bond strength tests. On each of the
selected pipes, three bond strength test shall be performed for each
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