The method of stress analysis for pipe with special joints including Y joint and taper - taper joint is indicated through the analysis of vacuum transfer line.
The invariablenes condition of circle girth of the join-line end of the main pipe was set up and the join-lines on Y-tee to be ellipse was made certain.
建立了圆柱分支管y型三通的主管相贯线处的周长不变的条件，确定了相贯线为椭圆。
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DQ-0772 Bonunion Huixin Coat Hat Rack Y-shaped body design, appearance patent and one structure patent for utility model, connected by necking pipe which makes top hook direction adjustable.