Pipelaying Tender-VOL IV - WorleyParsons.com

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EPMC SERVICES FOR REWARI – KANPUR PIPELINE SPECIFICATION FOR FIELD JOINT COATING (HEAT SHRINK SLEEVES) checked by means of contact type temperature-recording thermometer (Digital Pyrometer with flat probe type contact). Temperature indicating crayons shall not be used. Pre-heat temperature shall be checked on every joint. Care shall be taken to ensure that the entire circumference of the pipe is heated evenly. Temperature measuring instruments shall be calibrated immediately before the start of the works and thereafter at intervals recommended by the manufacturer of the instrument. 4.3.3 Upon pre-heating, the pipe surface shall be applied with two pack epoxy primer of wet film thickness 200 microns or as per manufacturers recommendation whichever is higher, to cover the exposed bare metal of the welded field joint and 10 mm min. onto the adjacent pipe coating if recommended by the manufacturer. The wet film thickness of the primer shall be checked on every joint with a wet film thickness gauge prior to installation of sleeve. Thickness gauge shall be calibrated once per shift. 4.3.4 Immediately after application of epoxy primer, the fiber glass re-enforced heat shrinkable wraparound sleeve shall be entirely wrapped around the pipe when the epoxy is still wet. Sleeve shall be positioned such that the closure patch is located to one side of the pipe in 10 or 2 O'clock position, with the edge of the undergoing layer facing upward and an overlap of min. 100 mm. Gently heat by appropriate torch the backing and the adhesive of the closure and press it firmly into place. 4.3.5 A heat shrinking procedure shall be applied to shrink the fiber glass re-enforced heat shrink sleeve in such a manner to start shrinkage of the sleeve beginning from the center of the sleeve and heat circumferentially around the pipe. Continue heating from the center towards one end of the sleeve until recovery is completed. In a similar manner, heat and shrink the remaining side. Shrinking has been completed when the adhesive begins to ooze at the sleeve edges all around the circumference. The complete shrinking of the entire sleeves shall be obtained without undue heating of existing pipe coating and providing due bonding between pipes, sleeve and pipe coating. The installed sleeve shall not be disturbed until the adhesive has solidified. 4.3.6 A sacrificial sleeve is to be installed on the leading edge to function as a wear cone during pull through of the pipe. Wrap the leading edge of the sleeve over the transition of main sleeve — mill coating. The closure is placed away from the main sleeve closure. Pre-heat the inside adhesive layer just next to the closure for a few seconds. Press down to make it stick to the other sheet end. Preheat the inside adhesive layer just next to the closure for a few seconds. Press down to make it stick to the other sheet end. Heat the closure area and immediately pat it down with a gloved hand. Shrink the leading edge sleeve down by moving the torch all around the pipe in a paint brush motion. Make sure the sleeve has fully shrunk and adhesives flow is evident on the both edges. Smooth down the edges of the sleeve with the silicone hand roller. n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for field joint coating\mh2145-c000-plspc-0015.doc MH2145-C000-PL-SPC-0015 RevA Page 37 of 42
EPMC SERVICES FOR REWARI – KANPUR PIPELINE SPECIFICATION FOR FIELD JOINT COATING (HEAT SHRINK SLEEVES) 4.3.7 The sacrificial sleeve is fully recovered when all the following have occurred: • The sacrificial sleeve is fully conformed to the main sleeve and adjacent coating. • There are no cold spots or dimples on the sleeve surface. • Adhesives flow is evident on the both edges after sleeve is cool. 4.4 PRE-QUALIFICATION OF FIELD JOINT COATING SYSTEM The field joint coating system materials and the procedures proposed by the Contractor shall be prequalified during the sleeve installation start-up phase. Five joints (5) shall be coated with the requirements of this specification and then inspected and tested in accordance with the requirements of this specification with respect to the following: a) Surface preparation, cleanliness, roughness profile and dust contamination b) Pre-heat temperature (as applicable) c) Primer thickness d) As applied coating thickness e) Holiday detection f) Peel test at (+) 23°C & (+) 60°C on pipe surface & factory applied coating and at over laps (as applicable). If required to achieve the temperature of (+) 60°C, suitable thermal blanket may be used. g) Visual appearance and void after installation on the body, area adjoining the weld and area adjoining the factory applied coating. (To establish voids adjoining the weld and factory coating, a strip of 50 mm wide and 200 mm long shall be stripped and examined.) Company Representative shall witness the tests and inspection. Regular application of field joint coating shall commence only upon successful completion of the pre-qualification testing. After successful completion of the pre-qualification testing as above, the entire field joint coating shall be removed, the pipe surface re-blasted and field joint coating re-applied as per the requirements of this specification. n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for field joint coating\mh2145-c000-plspc-0015.doc MH2145-C000-PL-SPC-0015 RevA Page 38 of 42
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