Development of capsules and pigs for inspection of small-diameter gas distribution pipelines
To inspect external corrosion of small-diameter gas distribution pipelines precisely, the three major gas companies of Japan have jointly developed inspection capsules (very small pigs) and pigs for the first time in the world. The laboratory test has been completed and the field test is now in progress. The inspection techniques developed are the following two methods: 1. Inspection methods for 2- and 3-inch screw-jointed mains: The inspection capsule is inserted through a launcher into a straight pipeline of 30m length on each side (60m total span) in live condition. The remote-field eddy current method and the impressed-current magnetic leakage flux method were adopted. 2. Inspection methods for weld-joint 4-, 8- and 12-inche mains: The pipeline is cut off (down to less than 300m length), and gas is purged by air. The inspection pigs pass through miter bends, short elbows of 1.5 DR and sleeve joints. The magnetic leakage flux method was adopted, while different methods of travel were adopted by the three contractors.
- OSTI ID:
- 6586405
- Report Number(s):
- CONF-880603-
- Resource Relation:
- Conference: 17. world gas conference, Washington, DC, USA, 5 Jun 1988; Other Information: Technical Paper IGU/D4-88
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
NATURAL GAS DISTRIBUTION SYSTEMS
IN-SERVICE INSPECTION
PIPELINES
NONDESTRUCTIVE TESTING
ACCURACY
CORROSION
NATURAL GAS
PIPE JOINTS
REMOTE SENSING
THREADED JOINTS
TRANSPORT
CHEMICAL REACTIONS
ENERGY SOURCES
ENERGY SYSTEMS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
INSPECTION
JOINTS
MATERIALS TESTING
TESTING
032000* - Natural Gas- Transport
Handling
& Storage
420500 - Engineering- Materials Testing