Volume-II of IV - GAIL

sleeves shall be obtained without undue heating of existing pipe
coating and providing due bonding between pipe, sleeve and pipe
coating. A thermochrome paint shall be applied a an closure patch
to indicate that sufficient heat/ temperature has been obtained. The
joint coating shall have wear cone applied over the leading edge of
the sleeve and the clamping belt tightened over it.
j) Application of Wear Cone - The leading edge will be given an extra
wear cone. Start by heating the leading edge area of the main
sleeve to 70 0 C. Wrap the leading edge sleeve over the transition
Mill coating. Ensure that the closure is placed away from the main
sleeve closure Shrink the leading edge sleeve.
k) Application of Metal Belt - The metal belt shall be applied over the
wear cone sleeve. The metal belt will be tightened using the
strapper tool supplied by the manufacturer.
l) Sufficient manpower working on opposite sides of each pipe joint
are required for installation of the sleeve.
m) The installed sleeve shall not be disturbed until the adhesive has
solidified.
5.0 INSPECTION
5.1 For wraparound coating, a visual inspection shall be carried out for the
following :
- Mastic extrusion on either ends of the sleeves shall be examined
- There shall be no sign of punctures or pinholes or bond failure.
The external appearance of the sleeves shall be smooth, free of
dimples, air entrapment or void formation.
- Weld bead profile shall be visible over the sleeves.
- The entire closure patch shall have changed colour uniformly.
5.2 Holiday Inspection
5.2.1 The Holiday Detector used shall be checked and calibrated daily with an
accurate D.C. voltmeter. The detector electrode shall be in direct contact
with the surface of coating to be inspected.
5.2.2 The entire surface of the joint section shall be inspected by means of a full
circle Holiday Detector approved by OWNER set to DC Voltage of at least
25 kV for wraparound sleeves. Inspection of the heat shrink sleeve coating
shall be conducted only after the joint has cooled below + 50°C.
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