Laboratory evaluation of in-ground cathodic disbondment of pipeline coatings

Journal Article · Mon Sep 01 04:00:00 EDT 1986 · Mater. Performance; (United States)

OSTI ID:5163387

Kellner, J D

The correlation of cathodic disbondment results on pipeline coatings obtained in laboratory tests such as the standard ASTM or Deutsches Institut Fur Normung (DIN)/sup (1)/ procedures with actual in-ground performance is necessary to determine the usefulness of the data. In this work, the cathodic disbondment of tape wrap coatings is measured in the laboratory in three ways: (1) On steel coupons, (2) according to ASTM G-8, and (3) in an apparatus designed to simulate soil burial at any desired depth. The soil simulation apparatus uses a rubber membrane surrounding the soil sample that then surrounds the coated pipe sample. The membrane can be pressurized by air to 1 to 10 psi (6.9 to 69 kPa) that effectively simulates burial depths of about 6 to 12 ft (2 to 4 m). The data for the rate of cathodic disbondment measured in the laboratory tests are compared to data from an outdoor test site for the direct burial of samples. The data show the rate of disbondment is slowest for direct soil burial, next slowest for the laboratory soil simulation, and fastest for the laboratory electrolyte test. The laboratory test data show the rate is very dependent on the restraining pressure, especially at elevated temperatures.

• Research Organization: Kendall Lexington Lab., 17 Hartwell Ave., Lexington, MA 02173
• OSTI ID: 5163387
• Journal Information: Mater. Performance; (United States), Journal Name: Mater. Performance; (United States) Vol. 25:9; ISSN MTPFB
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
022000* -- Petroleum-- Transport
Handling
& Storage
03 NATURAL GAS
032000 -- Natural Gas-- Transport
Handling
& Storage
42 ENGINEERING
420205 -- Engineering-- Transport & Storage Facilities-- (1980-)
ALLOYS
BENCH-SCALE EXPERIMENTS
CATHODIC PROTECTION
COATINGS
CORROSION PROTECTION
DATA ANALYSIS
DEPTH
DIMENSIONS
ELECTROLYTES
ENERGY SOURCES
FIELD TESTS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
IRON ALLOYS
IRON BASE ALLOYS
LEVELS
LOW PRESSURE
MEMBRANES
NATURAL GAS
PERFORMANCE TESTING
PETROLEUM
PIPELINES
PRESSURE DEPENDENCE
PROTECTIVE COATINGS
SOILS
STEELS
TESTING
TRANSPORT
UNDERGROUND