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why control valve size is normally 1 or 2 size smaller than pipe size? Thanks you for the answers!

thanks all for the comments. somebody said: flange break is better for hydrotest. is it right?

Normally, there is one set of flange for class break, let says: different pressure, or different material.... Does anybody know what the reason is? Do we have to need this set of flange?

Thank you so much, IONE and UAEPIPING!

Is there anybody know the meaning of steam trap right-handed or left-handed? Thanks in advance!

thanks for all replies. MortenA, If there is a vent valve right after reducer, is it still prefered using an eccentric top flat reducer?

I am sorry I should have provided more detial information. This PSV is dicharged into a closed system, reducer is to increase discharge pipe size. Thanks!

Is it preferred that using Flat On Top Eccentric Reducer on psv discharge? Somebody disagree with me using concentric reducer on psv discharge. Thanks!

Do we need provide more space than usual for piping connection when hydrolic tensioning is supposed to use for large bolts? for example, P&ID shows 10" flanged valve and 12x10 reducer, shoud I connect piping as 10" flanged valve, 200 mm pup, then 12x10 reducer? or between flanged valve and...

thanks Mikehalloran. I know round dimension looks nicer, my question "do we have to?" in fab and construction, people prefer round number on iso overall dimension or single component (fitting dimension is fixed, only non-fitting dimension is variablle)?

Do we have to ensure the dimensions on ISO drawing is even? for example, from equipment nozzle to elbow should be 2300mm instead of 2297mm; control valve station from one elbow to another elbow should be 4200mm instead of 4186mm? etc... thank you!

Hi All, Is there any way to lock chain operated valve? This valve is not accessable but procee engineer marked CSC on P&ID. Thanks,

thanks for your reply pennpiper, I am still confused. let's say 1" NPS pipe, we use pipe only for short distance (4" or 6"), if it is not in vent, drain connection. We don't use nipple in this cae. Do you know the reason?

I meant normally we use nipple for vent, drain, and instrument branch, but don't use it in other place. what's the reason?

Is there anybody know why we don't use nipple in inline piping? thanks,

Thanks for your reply, zdas04. Is this mean pig valve can not work independently without launcher and receiver? I am sorry for my understanding.

what is the difference between Pig Valve and Pig Launcher? Are they the same in function? Thanks!