New way to detect cast iron joint leaks

Journal Article · Mon Sep 01 00:00:00 EDT 1975 · Pipe Line Ind.; (United States)

OSTI ID:6205802

Graf, F L

Deep probes have been developed to be used in conjunction with air and vacuum testing of cast-iron main and service sections in order to reduce the number of unnecessary excavations. To eliminate the ballast-area soil gas that causes misleading gas evacuation information, a deep probe was designed that samples only from the main depth area and seals off the area above. Residual gas from the main area is removed by sending compressed air down a probe and pulling it with a vacuum up a 2nd deep probe placed about a pipe length from the 1st, on the opposite side of the main. If the evacuated gas concentration falls to a level above zero and remains steady for 5-10 min, then a leak exists between the probes. A 2-man crew can safely and economically locate and repair 1 joint/day.

• OSTI ID: 6205802
• Journal Information: Pipe Line Ind.; (United States), Vol. 43
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
NATURAL GAS
TRANSPORT
PIPELINES
LEAK TESTING
REPAIR
CAST IRON
ALLOYS
CARBIDES
CARBON COMPOUNDS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
IRON ALLOYS
IRON BASE ALLOYS
IRON CARBIDES
IRON COMPOUNDS
TESTING
TRANSITION ELEMENT COMPOUNDS
032000* - Natural Gas- Transport
Handling
& Storage