轧辊弯曲终成形工艺对埋弧焊管力学性能的影响

softening and a detrimental effect on the properties of the welded joint. The softening effect in the HAZ will potentially cause highly localized deformation, which is undesirable in conditions where strain-based design is applicable. Understanding the material mechanical property in double jointing welds, and approaches for measuring mechanical behavior of such welds are required in order to meet the increasing demand for double jointing in the pipeline industry. This paper presents an approach that has been used in TransCanada for understanding and evaluating double joint welds of high grade pipes. The approach has been implemented into detailed testing protocols, data analysis procedures and requirements, and has been proven to be an effective and practical means for double jointing evaluations.
IPC2010-31027
Decompression Wave Speed in Rich Gas Mixtures at High Pressures (37 MPa) and Implications on Fracture Control Toughness Requirements in Pipeline Design
高压下(37Mpa)富气混合物的纵波速率及对管线设计中断裂韧性控制要求的意义
K.K. Botros, J. Geerligs
NOVA Research & Technology Center, Calgary, Alberta, Canada.
R.J. Eiber
Robert J. Eiber, Consultant Inc., Columbus, OHIO, USA.
Abstract Measurements of decompression wave speed in conventional and rich natural gas mixtures following rupture of a highpressure pipe have been conducted. A high pressure stainless steel rupture tube (internal diameter = 38.1 mm, and 42 m long), has been constructed and instrumented with 16 high frequency-response pressure transducers mounted very close to the rupture end and along the length of the tube to capture the pressure-time traces of the decompression wave. Tests were conducted for initial pressures of 33-37 MPa-a and a temperature range of 21 to 68 oC. The experimentally determined decompression wave speeds were compared to both GASDECOM and PIPEDECOM predictions with and without non-equilibrium condensation delays at phase crossing. The interception points of the isentropes representing the decompression process with the corresponding phase envelope of each mixture were correlated to the respective plateaus observed in the decompression wave speed profiles. Additionally, speeds of sound in the undisturbed gas mixtures at the initial pressures and temperatures were compared to predictions by five equations of state, namely BWRS, AGA-8,

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