The prediction of burn-through during in-service welding of gas pipelines

Sabapathy, Prakash Niranjan; Wahab, Muhammad Abdul; Painter, M. J.

doi:10.1016/s0308-0161(00)00056-9

Cited by 50 publications

(14 citation statements)

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“…However, to improve the calculation precision for welding with weaving process, a few literatures about the welding with weaving are found. Sabapathy et al [14] proposed a mathematical model of heat source considering the effect of weave to describe the MMA welding process and predicted the weld cooling times, penetration, and HAZ hardness. Hu et al [15] developed a model to compare the difference of the temperature between welding with weaving and without weaving.…”

Section: Introductionmentioning

confidence: 99%

Effect of weave frequency and amplitude on temperature field in weaving welding process

Chen

et al. 2014

Int J Adv Manuf Technol

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The welding with weaving has been used widely to obtain better weld quality by avoiding lack of side wall fusion and improve the weld efficiency by obtaining the wide weld bead. But the effect of weave frequency and weave amplitude on the temperature field is not clear. In the present paper, a coordinate transformation method is put forward to simulate the weave welding process. The temperature distribution during the welding with weaving under different weave parameters are compared and discussed. Comparison between experimental and simulation results reveals a good agreement. The peak temperature and the average temperature in weld seam center decreased due to the increasing of the weave amplitude and weave frequency. But the weave frequency has less effect on the average temperature.

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Section: Introductionmentioning

confidence: 99%

Effect of weave frequency and amplitude on temperature field in weaving welding process

Chen

et al. 2014

Int J Adv Manuf Technol

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“…The thermal stress ( ) is a function of different variable according to equation (2). The following table shows accuracy of parameters used in the calculation of the error analysis.…”

Section: Error Analysismentioning

confidence: 99%

“…In long-distance pipelines, defects can occur as a result of construction faults, corrosion, third party interference, and ground movement [1,2]. When a segment of pipeline is found to be corroded or local damaged, one of the conventional repair methods is that the sections of the pipeline would have to be sealed and degassed before any welding process and then purged before reinstatement.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Pipeline In-Service Welding Process

Amori

Hussain²,

Hilal³

2021

Journal of Petroleum Research and Studies

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Welding of pipeline in active operation (called in-service welding) is an advancedtechnique employed to repair pipelines to safe transmission of petroleum or gas. A thermalexperimental study is accomplished on welding process of gas pipeline in this work. Anexperimental setup had been designed, manufactured and instrumented to estimate the methodfor repairing locally pipelines defects (such as cracks and holes wall surface) under the influenceof internal pressure. Also the thermal history of welding process was investigated experimentallyto three cases which are : traditional welding process with no fluid flows inside the test pipe, anin-service welding process considering air as the flowing fluid inside test pipe, and an in-servicewelding process considering the liquefied petroleum gas (LPG) as flowing fluid inside test pipe.Results show that direct deposition of welding metal on a through hole under the influence ofinternal pressure succeeded for flow rate less than (12lpm) and failed for flow equal or higherthan (12lpm) in which a sleeve repair is considered. The calculations are followed by a separatethermal stress analysis based on the thermal history.

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“…However, the cost is high in terms of venting and stopping the interior media supply. In addition, some of interior fluid leaks into the atmosphere which are wasteful and also environmentally damaging actions [2,3]. Welding onto a pipeline in active operation called in-service welding, it is an advance technique employed to repair, modify or extend of pipelines.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of In-Service Welding Process for Pipeline

Amori

Hussain²,

Hilal³

2019

Journal of Petroleum Research and Studies

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A numerical model had been developed using three dimensional finite element method to predict temperature history of pipe wall thickness by using a FORTRAN computer program. The developed numerical model concerned with the effect of power and velocity of moving heat source, temperature dependent material properties, and transient heat transfer and phase change transformation. Also the effect of heat flux and flow rate on cooling time was investigated numerically. An experimental setup had been designed, manufactured and instrumented to investigate the thermal history of an in-service welding process considering air as the flowing fluid inside test pipe. The burn-through was investigated experimentally under the influence of gas flow rate, heat flux and the depth of defect presented in pipeline wall. It has been concluded that the burn-through do not occur for the studied parameter range. The results showed that as the flow rate increases from (24 - 30 lpm) the cooling time decrease by a rate of (11.7 %) and when the flow rate increase from (24-60 lpm) the cooling time decrease by a rate of (41.1 %) without affecting peak temperature with pipe wall thickness of (6mm). Also it has been concluded that as the heat flux increases from (1110- 1370 kJ/mm) the peak temperature increases with a rate of (22.11 %) and cooling time increase with (25.4 %) when the heat flux increases from (1110- 1659 kJ/mm) the peak temperature increases with a rate of (46.86%) and cooling time increase with (50.7 %) with pipe thickness of (6mm).

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The prediction of burn-through during in-service welding of gas pipelines

Cited by 50 publications

References 1 publication

Effect of weave frequency and amplitude on temperature field in weaving welding process

Effect of weave frequency and amplitude on temperature field in weaving welding process

Experimental Investigation of Pipeline In-Service Welding Process

Thermal Analysis of In-Service Welding Process for Pipeline

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