Hydrogen entry and blister crack formation in linepipes under high pressure and dynamic sour gas bearing environments

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7244147

Shimizu, M; Iino, M; Kimura, M; Nakate, H; Ume, K

Simulated dynamic high pressure sour gas transmission pipe tests were conducted using 20'' (508 mm) diameter API grade X42 to X65 linepipes with various Hydrogen Induced Cracking (HIC) susceptibilities. The purpose of the tests was to assess the actual severity of sour gas pipeline environments and to establish a rational test method for evaluation of HIC resistance of linepipe steels. Hydrogen permeation rate was monitored by means of newly developed electrochemical cells during the tests, and HIC crack area ratio of the test pipes was measured by ultrasonic testing (UST) after the long-run tests. The results showed that hydrogen permeation behavior in the simulated tests is roughly classified into two types; one has a higher peak value and rapid decay, and the other has a lower peak value and slow decay. Under the flow rate of 10 ft/s (3.05 m/s), the former was observed at the high H/sub 2/S partial pressure of 15 atm (1.5 MPs) and the latter at the low H/sub 2/S partial pressure of 2 atm (0.2 MPa). From the UST, it was clarified that pipes which showed a crack area ratio of 20% or lower in the NACE, TM-01-77 solution exposure test exhibited no HIC in any simulated test.

• OSTI ID: 7244147
• Report Number(s): CONF-870314-
• 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
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
CORROSIVE EFFECTS
CRACKS
EMBRITTLEMENT
ENERGY SOURCES
ENERGY SYSTEMS
FLUID MECHANICS
FLUIDS
FOSSIL FUELS
FRACTURE MECHANICS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDRAULICS
HYDROGEN COMPOUNDS
HYDROGEN EMBRITTLEMENT
HYDROGEN SULFIDES
MECHANICS
NATURAL GAS
NATURAL GAS DISTRIBUTION SYSTEMS
PIPELINES
SIMULATION
SULFIDES
SULFUR COMPOUNDS
SULFUR CONTENT