Volume-II of IV - GAIL

3.5 Materials shall be stored in sheltered storage in the manufacturer’s original packing
and away from direct sunlight and in accordance with manufacturer’s instructions.
3.6 CONTRACTOR shall provide and maintain mobile facilities which contains all
necessary equipment and its spares for cleaning, coating repairs, inspection and
tests.
3.7 CONTRACTOR shall furnish sufficient number of the following equipment and the
required spares as a minimum for inspection and test purpose for each crew.
a) Fully automatic full circle adjustable holiday detector with a visible and
audible signal system for inspection of coatings.
b) Thickness gauge for measuring thickness.
c) Contact type temperature recording thermometer.
d) Roughness profile measuring (Stylus) instrument.
4.0 APPLICATION PROCEDURE
4.1 General
4.1.1 The application procedure shall be in accordance with manufacturer's instruction
and the minimum requirements specified below whichever are most stringent and
shall be demonstrated to and approved by the company. Manufacturer’s expert
shall supervise the application and shall be available at site upon request during
qualification of application procedure and during construction at CONTRACTOR’S
cost.
4.1.2 Operators for coating application shall be given necessary instructions and
training before start of work, by the CONTRACTOR. To verify and qualify the
application procedures, all coating applied during the qualification test, shall be
removed for destructive testing as detailed subsequently in this specification.
Contractor shall only utilize those operators who have been approved/ prequalified
by the field joint coating manufacturer.
4.1.3 Oil, grease, salt shall be removed from steel surface by wiping with rags soaked
with suitable solvents such as naphtha or benzene. Kerosene shall not be used for
this purpose. Solvent cleaning procedure according to SSPC-SP 1 shall be followed.
4.1.4 Each field joint shall be blast cleaned using a closed cycle blasting unit or an open
expendable blasting equipment. With the first equipment type, steel or chilled shot
and iron grit shall be used and Garnet material with the second one. During blast
cleaning the pipe surface temperature shall be simultaneously more than 5° and
more than 3°C above ambient Dew Point, while the ambient Relative Humidity shall
not be greater than 85%. Prior to surface cleaning the surface shall be completely
dry. The surface shall be cleaned to a grade Sa 2½ in accordance with Swedish
Standard SIS-055900 with a roughness profile of 50-70 microns. Surface
roughness profile shall be measured using an approved profile comparator in
accordance with ISO 8503-1 and shall be calibrated prior to the start of the work in
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