PSV Capacity Assessment for Submarine LPG Pipelines..

[Okanv]

My question is related with the safety relief valve capacity assessment of a submarine LPG pipeline.

The system is consisted of 14" SCH XS (Mix LPG) and 10" SCH 40 (Propane) seamless steel piping with a length of 1.450 meters; both isolated with HDPE for 2.2 mm. These pipes are mostly buried under the seabed, going to a maximum depth of 40 meters. Maximum operation pressure will be 17.5 bars, the latest to be valid for the safety valves's discharging setpoint.

I have looked to find anything related other than the bulk storage tanks but related with the piping, especially for the submarine piping, but unfortunately I wasn't lucky enough to find it out.

So, could anyone enlighten me with this issue? Any info including, formulas, related standards etc. will be welcomed.. Thanks before

 

[EGT01]

Okanv,

I think you are going to need to do a little more research on the piping system for which you are trying to provide relief protection. In particular, only you can determine what code or standard that was followed for design of your pipeline.

As example of typical piping codes, see this link

http://www.piping-toolbox.com/17_39.html

Once you determine the code to which your system was designed, then you should review the pertinent code which will likely answer your other questions. If not, then you can post again for further assistance.

I would suspect that B31.4 applies to your system but you need to do your research. My work mostly involves in-plant piping but I'm sure there are others that could assist with questions about off-shore type piping.

 

[Okanv]

EGT01, Thanks for your answer, first of all.. My quick answer to the code knowledge is that the chosen code is API 1104 for the piping process. But it doesn't cover pressure relief issues. If we return to ASME, Sec VII Div.1 gives only general information for the pressure relief subject.

As my concern is a little bit specific, I admit, because this is a submerged piping, I should look for a narrowed search, but as explained earlier, couldn't arrivve to the point.. As this is a critical subject, I guess that I need an expert's hand..

Hope I'll be able to have more answers..