How to determine the span for vertical gate type compensation
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As shown, the gas pipeline is DN500 with a wall thickness of 11； Insulation thickness: 180. OPE operating condition: pressure of approximately 0.1 Mpa ； Temperature 250℃ ； For gas pipelines with vertical door-type compensation, a guide frame GS(A) is installed at the middle position when they are in an upright position. However, under OPE operating conditions, point A remains unsupported; springs are not used in the middle section ； However, there are concerns that under OPE operating conditions, relying solely on points B and C for support may not ensure pipeline stability nor meet the span requirements. How to calculate and prove it? Can Caesar calculate and prove it? Are there any tables where I can check this? Thank you all!
This post was last edited by whazup on 2020-4-21 at 14:35; the C2 version from 2016 can be used to verify SUS in the case of empty fields
Thank you very much. When you have time, what computational structure should SUS look at?
To view the stress for this condition of alt-SUS
Under normal circumstances, the midpoint of a vertical type distributor will definitely become void; it is usual to install a constant-force spring at that midpoint, as failing to do so is quite dangerous
The GS (A) designed for the 1st floor will inevitably be suspended, but the GS (A) is equipped with guide frames to meet the stability requirements. After checking Teacher Song’s book \"Pipeline Stress Analysis and Engineering Applications\", the span between points B and C just meets the requirements regarding the external deflection of the installation. Therefore, there is no need to spend extra money on setting up a spring frame in GS (A).
First of all, the point in the middle of your vertical structure will inevitably be left unoccupied; it is necessary to use a spring, and most likely it will be a constant-force spring (since the rate of change of your load exceeds 25%, making it impossible for the system to determine the appropriate type of spring). The compensatory effect of a vertical setup is not as good as that of a horizontal one. Of course, for a vertical setup like yours, it seems you would need to use some kind of truss structure to span the road, right? Adding guide frames only increases its stability. The span of DN500 pipes is already quite large; you can do some calculations to see that the spring in the middle might be variable rather than providing a constant force.