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Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   FEBRUARY 2017 , Volume 16 , Number 11 ; Page(s) 284 To 290.
 
Paper: 

EXPERIMENTAL DETERMINATION OF FRACTURE TOUGHNESS OF BASE STEEL AND LONGITUDINAL SEAM WELD IN API X65 GAS LINE-PIPE USING UNLOADING COMPLIANCE METHOD

 
 
Author(s):  ASGHARI VAHID, CHOUPANI NAGHDALI*, HANIFI MAHDI
 
* DEPARTMENT OF MECHANICAL ENGINEERING, SAHAND UNIVERSITY OF TECHNOLOGY, TABRIZ, IRAN
 
Abstract: 

Structural-integrity assessments of pipelines play a key role in the design and safe operation of pipeline systems. Gas pipelines currently experience internal transmission pressures up to 15 MPa in low ambient temperatures. Combination of high strength and good toughness is essential for the steels and welded joints used in pipelines. In this study, theK IC toughness has been determined for base metal and seam weld of a pipe of grade API X65, following the ASTM E1820 standard. The API X65 steel is the most commonly used pipe material in Iran high-pressure gas transportation pipelines. The fracture toughness tests employed side-grooved and fatigue pre-cracked compact tension specimens, extracted from the original pipe, to determine the crack growth resistance curves based on the unloading compliance method using the single specimen technique. From these, K IC values of 302 MPam0.5 and 262 MPam0.5 were obtained for base metal and seam weld, respectively. These results produce toughness data which serve to evaluate and compare crack growth resistance of base metal and seam weld metal and to determine the critical sizes of acceptable cracks in pipelines.

 
Keyword(s): NATURAL GAS TRANSMISSION PIPELINES, API X65 STEEL, FRACTURE TOUGHNESS, LONGITUDINAL SEAM WELD, UNLOADING COMPLIANCE METHOD
 
References: 
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