Pipelaying Tender-VOL IV - WorleyParsons.com

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EPMC SERVICES FOR REWARI – KANPUR PIPELINE SPECIFICATION FOR CONCRETE WEIGHT COATING 14. COATING OF FIELD JOINTS 14.1 The CONTRACTOR shall coat the uncoated pipe surface at field welds in accordance with methods approved by OWNER. CONTRACTOR shall submit a detailed procedure for joint coating for Owner's approval. 14.2 The reinforcement for the field welds shall be same as that for line pipe coating with the same number of layers and the same space between layers as for the existing coating. The edges of this netting must be carefully secured with Galvanized wire to the reinforcement extending from the existing coating. The reinforcement shall not make direct /electrical contract with the pipe. Synthetic resin spacer blocks shall be used to keep the reinforcement away from the corrosion coated pipe surface. 14.3 The composition of the concrete shall be the same as that of the concrete coating of the pipe. 14.4 When moulds are used if approved by the OWNER, the CONTRACTOR shall prevent air being trapped by applying mechanical vibrators or by striking the outside of the moulds with suitable sticks. n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for concrete weight coating\mh2145- c000-pl-spc-0014.doc MH2145-C000-PL-SPC-0014 RevA Page 20 of 23
EPMC SERVICES FOR REWARI – KANPUR PIPELINE SPECIFICATION FOR CONCRETE WEIGHT COATING 15. REPAIRS The following are repairs that will be permitted to coating due to unavoidable damage in handling and in storage (This applies only to concrete that has hardened). 15.1 Spalling due to compression or shearing caused by impact against other objects. spalling is defined as damage, which causes a loss in concrete of more than 25 percent of the total thickness of the coating at the point of damage. 15.2 Damage due to spalling of an area of less than 0.1 m2 (1 square foot) where the remaining concrete is sound will be accepted without repairs. 15.3 Damage due to spalling of an area of more than 0.1 m2 and less than 0.3 m2 shall have the concrete remaining in place over that area removed as necessary to expose the reinforcing steel throughout the damaged area. Edges of the spalled area shall be under-cut so as to provide a key lock for the repair material. A stiff mixture of cement, water and aggregate shall be trowelled into and through the reinforcement and built up until the surface is level with the coating around the repair. The pipe shall then be carefully laid with the repaired area at the top. The repaired area shall be moist cured for a minimum of thirty six (36) hours before further handling. 15.4 Should the damaged area be more than 0.3 m2, coating shall be removed around the entire damaged area. A repair shall be made by satisfactorily restoring the reinforcement, forming the area with a metal form and pouring a complete replacement of materials similar to that from which the coating was made. The mixture shall be one (1) part of cement to three (3) parts of aggregate and the necessary water to produce a slump not to exceed 100 mm (four inches). The resulting coating shall be equal in eight, density, uniformity, thickness, strength and characteristics to the originally applied coating. The pipe shall then be carefully laid in a position where it shall be allowed to remain for a minimum of 36 hours before further handling. n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for concrete weight coating\mh2145- c000-pl-spc-0014.doc MH2145-C000-PL-SPC-0014 RevA Page 21 of 23
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Pipelaying Tender-VOL IV - WorleyParsons.com

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