DCC Unit A335 Jingbian-yanshuiguang Pipeline Industrial Park-P22 Thick-walled Pipe Welding And Heat Treatment Technology Research

High pressure steam pipeline in petrochemical units often choose material A335-P22 pipes of thick wall.This kind of pipe welding installation quality,directly affect the device,the operation of high pressure steam system affect the steam turbine and compressor unit operation,safe and smooth operation of the entire unit play a critical role.A335-P22 for imported materials,technical standard ASTM A335.-This kind of pipe wall thickness for the wall thickness,the domestic market in the pipe installation is only before thermal power industry will be used to this kind of pipe material,so the A335-P22 ultra thick wall pipe system,welding technology and heat treatment technology is to solve the company occupy the market necessary tasks in the field of this kind of material.Through the extension of the oil jingbian-yanshuiguang pipeline energy chemical projects 1.5 million tons/year ethylene(DCC)catalytic pyrolysis device A335-P22 high pressure steam pipeline welding,heat treatment system security technology research and summarize,make the company one step closer to mastering A335-P22 thick-walled pipe welding heat treatment,thick wall pipe system,process and technical requirements.This paper collected at home and abroad for A335-P22 and the research status of welding and heat treatment,A335-P22 pipes,physical properties and engineering mechanics properties for extending oil jingbian-yanshuiguang pipeline energy chemical projects 1.5 million tons/year ethylene(DCC)catalytic pyrolysis device used in the pipe specifications,and first in the laboratory for A335-P22 pipes welding test,welding procedure qualification,in accordance with the welding work book on project assignments,welding defects in the statistics for articles involved in the engineering data sorting,welding defects in the statistics,analyzes the reasons of welding defects,propose solutions and sums up the preventive measures,and to improve the welding process,used in the construction.This article through to prolong oil jingbian-yanshuiguang pipeline energy chemical projects 1.5 million tons/year ethylene(DCC)catalytic pyrolysis device A335-P22 pipe welding and heat treatment of the construction of a variety of pipe welding parameters and the selection of heat treatment process,solve the problem of engineering of welding technology and process,to develop a reasonable welding process,the process and parameters of the better,to guide the engineering after welding technical standards to ensure engineering quality.