Evaluation of splashzone maintenance coating systems by accelerated laboratory testing and field trials

Conference · Thu Sep 01 00:00:00 EDT 1983 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:7080162

Tischuk, J L; Brebner, G

Maintenance painting of platform splashzones is one of the most difficult offshore coating problems. There is a limited and frequently interrupted weather window for working, the temperature is generally low, the relative humidity is usually high and surfaces may be subjected to salt spray or complete immersion within a few hours of coating application. Once a coating is on the steel, it is continually wet and must resist abrasion and impact from the sea and from debris which is in the sea. In order to stand up to these conditions, splashzone coatings must adhere tightly to the steel, they must be tough and resilient and they must be resistant to the spread of local damage. Occidental's Piper and Claymore Platforms were installed in the North Sea in 1976 and 1977 respectively. The original splashzone coatings applied during fabrication were high-build vinyl systems over zinc silicate primers. The same coating systems were used on the platform topsides. By 1978 there was a need for coating repairs because the vinyls had poor abrasion resistance. It has proved impossible to use the original coating system for the repairs because it is intolerant of ambient conditions. Major maintenance painting programmes were planned for both platform splashzones in 1983. Surveys had shown that both splashzones required blasting to bare metal and recoating. Field trials and accelerated laboratory tests were used to select a coating system for the platform splashzones from nine alternative systems. The materials tested were ones presented by major manufacturers as their recommended splashzone systems. The coating systems ranged from coal tar epoxies to a very-high-technology system of primer injected into the grit-blasting nozzle followed by a single coat of high-build, solvent-free epoxy. Detailed descriptions of the coating systems are given in Table 1.

• Research Organization: Occidental Petroleum (Caledonia) Ltd.
• OSTI ID: 7080162
• Report Number(s): CONF-8309190-
• Journal Information: Soc. Pet. Eng. AIME, Pap.; (United States), Vol. SPE11905; Conference: Society of Petroleum Engineers of AIME conference - offshore Europe 83, Aberdeen, Scotland, 6 Sep 1983
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
NORTH SEA
NATURAL GAS FIELDS
OIL FIELDS
OFFSHORE PLATFORMS
CORROSION PROTECTION
WAVE FORCES
PROTECTIVE COATINGS
COMPARATIVE EVALUATIONS
FIELD TESTS
MATERIALS TESTING
SEAWATER
CORROSIVE EFFECTS
STEELS
SURFACE COATING
ABRASION
COAL TAR
EPOXIDES
MAINTENANCE
PAINTS
ALLOYS
ATLANTIC OCEAN
COATINGS
DEPOSITION
GEOLOGIC DEPOSITS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
RESOURCES
SEAS
SURFACE WATERS
TAR
TESTING
WATER
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
423000 - Engineering- Marine Engineering- (1980-)