Pipelaying Tender-VOL IV - WorleyParsons.com

EPMC SERVICES FOR REWARI – KANPUR PIPELINE
SPECIFICATION FOR FIELD JOINT COATING (HEAT SHRINK SLEEVES)
4. APPLICATION PROCEDURE
4.1 GENERAL
The application procedure shall be in accordance with manufacturer’s instructions and the minimum
requirements specified below whichever are the most stringent and shall be demonstrated to and
approved by the Company. Manufacturers expert shall supervise the application and shall be
available at site upon request during qualification of application procedure and during construction at
Contractors cost.
4.2 OPERATOR QUALIFICATION
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.
4.3 SURFACE PREPARATION
Oil, grease and 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.
4.3.1 BLAST CLEANING
Each field joint shall be blast cleaned using a closed cycle blasting unit or 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 (in case the authority having jurisdiction have no objection, the
contractor may adopt sand blasting instead of garnet material). During blast cleaning the pipe surface
temperature shall be simultaneously more than 5°C 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
surfaces shall be completely dry. The surface shall be cleaned to a grade SA 21/2 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 accordance with ISO 8503-3 or ISO 8503-4. The blast
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