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Looking at the iso, it would be good to know the slug length. Obviously no lengths on the iso, but im guessing that section you've clouded is comparatively short? You need a good straight length of line for a slug to form. if the calculated slug length is comparable to the lengths of straight...

What is the slug length Aspen has calculated? Are there significant straight lengths where slug flow could fully develop? Going from 3" to 6" is a significant jump, both in cost and space terms. I wouldn't be making that change without a thorough analysis.

Just to add to this I had an issue recently on a plant where significant re-engineering was required right at the end of EPC. During HAZOP an overpressure scenario was not considered credible because there was a 11/2" vent on a compressor gearbox. This vent was not nearly large enough for the...

Great advice thanks georgeverghese!

I've been able to source the HP curve from the vendor.... though I'd still be interested to hear if anyone had any thoughts on my original question above.

Whats the design pressure of the nitrogen system? if it is higher than that of the downstream system connected for purging then there is a valid overpressure case and you need to determine if relief is necessary. If you are going to rely on an open vent on the downstream system, then as a worst...

Thanks again georgeverghese! I have another question(s), perhaps you can help me..... I'm asking this after already asking lots of people in the client office I'm based in, and also people back at the design house. I am wanting to complete compressor performance calculations using GPSA method...

Thanks for the replies georgeverghese, very helpful! I continued to do some digging on this and I think I've found the answer. In App B1 of "A Practical Guide to Compressor Technology, Second Edition, By Heinz P. Bloch", theres a run though of compressor performance calcs. It shows that...

Hello, I am completing a relief calculation for a PSV on the discharge of a compressor. I am using GPSA engineering handbook method for eveluating compressor performance. I am having some difficulty interpreting the calculation methodology in GPSA Section 13, compressors. Specifically equation...