Cold tapping method shows promise for subsea repair

Journal Article · Fri Jul 01 04:00:00 EDT 1983 · Pipe Line Ind.; (United States)

OSTI ID:6487554

The Comex/Konsberg Total Marine Norsk project consists of positioning two Kleber plugs into the pipe to isolate the damaged section. In subsea pipe line repair, two main types of damage can be considered: 1. wet buckle; 2. dry buckle. A serious wet buckle means a hole in the line and the line operator will shut down production and flood the line with a corrosion inhibitor in order to minimize pollution and loss of gas. The line is flooded and the repair procedure is conducted without use of ''tapping'' techniques. A standard hyperbaric welding operation can be done by use of wellknown and proven diving methods. A dry buckle or a small leakage means the line is able to keep pressure and move gas. However, a buckle often means an obstruction to pigs. By experience the operator knows that a dry buckle strongly weakens the line and may grow gradually into a wet buckle. Because the operator first wants to keep line output reliability, he prefers to replace the damaged section as soon as the buckle is located.

• OSTI ID: 6487554
• Journal Information: Pipe Line Ind.; (United States), Journal Name: Pipe Line Ind.; (United States) Vol. 59:1; ISSN PLINA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420205 -- Engineering-- Transport & Storage Facilities-- (1980-)
423000* -- Engineering-- Marine Engineering-- (1980-)
APPROPRIATE TECHNOLOGY
CLOSURES
DEFECTS
INSTALLATION
PIPELINES
PLUGGING
REPAIR
UNDERWATER OPERATIONS