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What do you mean by "How Often"?

Hi All, I am looking after construction/installation of pressure equipments and respective piping systems of oil refinery on site. Very soon I am going to be involved in the commissioning of the installed equipments. I have to prepare procedures for lining up and pressurizing and testing the...

MJCronin, Thanks a lot, these links are helpful. Zalamay

Thanks Chicopee, what site you are talking about?

Can some one explain what are the exact functions of nozzles with Thief Hatch. Thanks

Waterpipe, Thanks a lot for the valluable advice I will greatly appreciate if you can show your EXCELL sheet also. Thanks

Thanks every body for the response, What is the best/easy way to find out/calculate Pressure drop (DP). Thanks once again

Is it correct to assume 6" dia pipe, 100 feet long as a vessel and calculate time for draining it through 3/4" drain.

I am trying to calculate rate of flow from drain of pipe. pipe size is 6" about 100 feet long, and drain size is 3/4". It is a gravity flow and medium is water. there is a large piping system which we have to drain for shut down, we have to calculate the time it will take to drain that. Thanx...