Volume-II of IV - GAIL

3.1.3 Sleeve Adhesive
The inner surface of the sleeves shall be coated with a controlled
thickness of minimum 1mm of adhesive which in combination with the
modified epoxy primer, will bond to and seal to the steel pipe and common
yard applied medium temperature yard coatings.
3.1.4 Epoxy Primer
The Epoxy primer shall be a solvent free, modified two components liquid
epoxy type primer, which is applied to cleaned and dry steel surface.
When the sleeve coatings, comes in contact with the liquid primer during
installation, a strong bond is formed upon full curing of the system.
3.2 Properties of Field Joint Coating Material
The pipe sleeves furnished under this specification shall be tested and
shall meet the requirements specified in the table below:-
3.2.1 Heat-Shrinkable Sleeve Material
Property Test
Method
Condition Requirement
Cold Crack ISO 4675 Below 40°C
Chemical
resistance
Followed by test for
bursting strength
Thermal ageing
Followed by test for
bursting strength
3.2.2 Adhesive material
ISO 175 168 hrs. immersion on either
0.1 N
NaCl @ 23°C, 0.1N H2 SO4 @
ISO 3303
23°C, 0.1 N NaOH @ 23°C,
Fuel oil @ 23°C. Petroleum jelly
@ 70°C
23°C 1100 N Min.
ISO 188
ISO 3303
150°C 168 hrs.
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23°C
1700 N Min.
Property Test
Method
Condition Requirement
Softening point ASTM E28 85°C minimum
Peel Strength DIN 30672 23°C. CHS*
100 mm/ min.
60°C
200 N/cm minimum
60 N/ cm