Pipeline Coating Condition Assessment and Installation Assessment, San Nicolas Island

This report documents the efforts of the Naval Facilities Engineering Service Centers NFESC Coating Specialists response to a request by the Mechanical Systems Branch Code 231 of NFESC to perform a pipeline coating condition assessment and an installation assessment. Findings from NFESCs assessments are as follows A San Nicolas Island rock and soil produced coating scratches equivalent to 60 - 400 grit sandpaper, B Field repairs contained surfaces with flash rusting and most likely contain high levels of chloride ion contamination, C The fully cured coating has a Shore A Hardness value of 95, D The pipe has a 1 - 2 mil grit blasted anchor profile, E The coating has poor gouge resistance manufacturers data, F The coating has poor impact resistance manufacturers data G Average coating loss from taber abrasion was 345 mg and represents low abrasion resistance, H Coating loss from simulated abrasion over a 900 ft horizontal pull ranged from 50 - 100 mils 0.97218 - 1.94436 gram coating lossin2, I Coating has an average cohesive strength of 716 psi maximum shear bond strength, and J A putty knife using hand pressure gouged and removed coating chunks cohesive failures. If the applied coal tar urethane has greater than 700 psi adhesion and field repairs contain less than 7 ugcm2 of chloride ion contamination at the pipecoating interface, then several options may be used to increase the coatings abrasion and gouge resistance A Apply either a chemically compatible adhesive or a layer of the coal tar urethane over the existing coating system followed by round polyethylene sheet, B Apply either a chemically compatible adhesive or a layer of the coal tar urethane over the existing coating system followed by a hot applied shrink sleeve, and C Apply an additional layer of coal tar urethane containing a high loading of either sand or aluminum oxide.