2 replies to this topic

[deltaChe]

Fig1 .Pump discharge fluid is acetic acid . and utility connection is nitrogen/service water.

Fig2. The process line is nonyl phenol exthoxylate and utility connection is nitrogen/service water.
(Please see attached file)



My question is why the utility connection in fig 1 have check valve instead of blind flange like figure 2.

I know that there may be the two reasons to put blind flange (1). The process line is easy to leak or highly Explosive / (2) The process is batch not continuous.

But this seems not fit the above requirement. Please help me out.

Thank you very much.

Attached Files

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[fallah]

My question is why the utility connection in fig 1 have check valve instead of blind flange like figure 2

As observed,regarding the check valve,two configuraions are similar,i.e. both of them including check valve.Please clarify.

Difference between two configurations limited to considering spectacle blind in Fig. 2 while not considered it in Fig. 1.The reason could be considerably higher design pressure of Fig. 2 relevant configuration.

Edited by fallah, 03 July 2010 - 03:09 AM.

[Chem01]

Can you confirm both utility connections are permanent lines connected to the header?
When a permanent utility (water, air etc) line is connected from main header to the process, blind is provided to ensure positive isolation to carry out any maintenenance job on either side.
A change in design pressure should have been highlighted by a change in piping specification on the PID, that I cannot see?

Regards,