Recoating large diameter high pressure natural gas pipelines

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6586638

Ediger, F W; Banach, J L

The paper deals with a field recoating process applied to large diameter gas transmission pipelines. Like many other gas transmission companies, TransCanada PipeLines Ltd. (TCPL) has sections of its system where the coating has deteriorated with time. The traditional method of dealing with this problem is to continually improve the cathodic protection (C.P.) system. This constant upgrading of the C.P. system can lead to very high C.P. costs. As an alternative TCPL explored the concept of a technically and economically feasible field recoating process, developed novel procedures and put them into practice. The challenge was to take the typical stationary coating plant process to the pipeline right-of-way. This involved the design and fabrication of prototype equipment capable of cleaning and coating a pipeline on a field applied basis but without compromising TCPL's current coating standards obtainable in a coating plant. These procedures were successfully employed on the rehabilitation of 14 km of 864 mm outside diameter (O.D.) pipe in Western Canada. Rehabilitation consisted of selective pipe replacement, recoating and hydrostatic testing. Current coating standards were not compromised and strict application specifications were followed. Results show promise for large scale rehabilitation of pipelines with serious coating problems.

• OSTI ID: 6586638
• Report Number(s): CONF-880603-
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
032000* -- Natural Gas-- Transport
Handling
& Storage
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
CLEANING
CORROSION PROTECTION
DEPOSITION
ELEMENTS
ENERGY SOURCES
ENERGY SYSTEMS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
METALS
NATURAL GAS
NATURAL GAS DISTRIBUTION SYSTEMS
PERFORMANCE
PIPELINES
RETROFITTING
SURFACE COATING
TRANSPORT