AMPP Pipeline Coatings case studies
AMPP Pipeline Coatings · Put your knowledge to work in context.
The AMPP Pipeline Coatings Inspector (PCI) credential sits inside AMPP's education and certification portfolio. AMPP describes itself as the largest global community for corrosion and coatings expertise, and its catalog of courses and certifications explicitly covers coating inspection, protective coatings, cathodic protection, and corrosion prevention. The AMPP Pipeline Coatings case studies are 5 cases and about 4,279 words.
1External corrosion where every CP reading passes: the shielded disbondment call
A 20 in (508 mm) crude transmission line, API 5L X65, 9.5 mm wall, was built in 2011 with plant-applied 3-layer PE and heat-shrink field joints. Operating temperature is 40 C.
896 words, about 4 min2Coating selection for a 112 C cyclic crude line in rocky backfill
A 16 in (406 mm) crude gathering line, 22 km long, X65, 12.7 mm wall, will operate at 112 C with a design temperature of 125 C. It is buried at 0.9 m cover in rocky limestone soil with occasional rock shield, and it cycles between full flow and shutdown roughly twice a week because of upstream tank scheduling.
852 words, about 4 min3Girth-weld coating after overnight blasting: salt, rust, and a closing weather window
A field-joint crew is coating girth welds on a 30 in (762 mm) gas line in late October. Conditions are: air 8 C, relative humidity 85%, steel temperature 6 C, dew point 5 C.
822 words, about 4 min4Induction heating on a windy day: under-cured field-applied FBE
A contractor is applying field-applied FBE to girth welds on a 24 in (610 mm), 12.7 mm wall X70 line. The procedure requires a minimum steel temperature of 232 C at the coating window, verified by contact thermocouple, with a 30 s soak before powder application.
853 words, about 4 min5Reading a 3LPE inspection package: primer thickness, peel, and disbondment together
An inspection package for an 18 in plant-applied 3-layer PE line reports: total dry film thickness by magnetic gauge 2.7-3.4 mm against a 3.2 mm minimum; holiday test at 10 kV found 14 holidays in 1.8 km, all within 150 mm of the weld seam; peel adhesion 9 N/cm against a specification of 15 N/cm minimum; cathodic disbondment after 28 days at 65 C and 1.5 V gave an 11 mm radius against a maximum of 8 mm; impact testing passed; the FBE primer measured 45-55 micrometres against a nominal 80 micrometres. The applicator states the disbondment result is a laboratory artefact, offers to re-test, and points out that the coating looks sound and the holidays are only near the seam.
856 words, about 4 min