Dear Friends,
I have been learning to do a stress analysis for Manifold lines, which has 5 Headers (24") and several slots (Flow lines - 100 (6")) connecting to each Headers. Design Pressure - 140 bar, T - 100 c, pipe thickness are 32 mm & 14 mm (approx.) and flange ratings are 900 lb. API 5L G. B Material for pipe.
I completely modeled the whole system by providing node increment 2 for every Headers & Slots (Separately drawn H & S and attached). While executing the analysis, I found CAESAR II takes several min to run the model because of less node increment.
Then I decided to split the model into three parts and performed the analysis once again. Now I have a couple of doubts, the place where I separated the second model is 1/3 of the header lines, where there is no anchor. Do I have to enter first part end point D & F for the second part starting point? If I enter the D & F at second part I will get new D & F, so what should I do with that new D & F how to correlate this two. Or else, should I place an anchor at the both parts.
After the First part accomplished, I noticed that the Header line lifts slightly (2 mm) during operating condition but well seated at sustained case (load- 6 tones). Headers are supported by a pipe rack, it has column every 6 meter apart throughout the end. Though the lifting is slightly more it effects in flow lines support (3 tones) which is connected from bottom to the every header through a weldolet. Sustained case 0.8 ton at the flow line support.
Please suggest me how to separate complex model. Though the pipe rack support is a fixed one how to utilize it and make to rest the pipe during operating condition. Also kindly give me some guidelines (reference) to get a better knowledge about this.
------- Raam...
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