RE: THREADED PIPING

From: <Liu>
Date: Thu Aug 15 2002 - 10:04:00 EDT

Hi Edwin,
Good to have a real fitter here. i was talking about 1", 150#, cs, glycol line.Which are connected to the nozzle of unit heater by a union. Between this union and 3" header we have: 1) on the feeding line: one 1" flow control valve, one gate valce; 2) on the return line: one 1" gate valve.

So do I need another one (or 2) union beside the one on the nozzle?

Thanks

Robert Liu
Piping/Mechanical Designer
UE-1 Project
CoSyn Technology
1-780-440-7254
Robert.Liu@UE-1.com

-----Original Message-----
From: ricandeacon@aol.com [mailto:ricandeacon@aol.com] Sent: Wednesday, August 14, 2002 8:16 PM To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] THREADED PIPING

What is the process? If you are installing a natural gas screw 150# piping installation, then yes you would need to provide a union, between the gas plug valve and regulator, for ease of removal in the event the regulator malfunction. On low pressure steam 150,or300# screw piping installation you would install unions on all control valves, and by-pass valves and, traps on

the condensate.
On any screwed compress air piping you would also install unions down stream

pressure of any valves between air regulators, on any 300# screw piping where
the process is subjected to be more extensive flanges would be installed or what ever the engineer, calls for on the job specs. There are many times in field conditions where we as professional pipe fitter tradesman we must take

it upon our self's to make a judgment case whether to use a union, flange, vic connection, with in the specs of the called out job material to make a threaded connection work. Always keep in mind as long as the connection is down stream of the pressure side with proper maintenance you shouldn't have many problems, always keep in mind the process piping.

                                          Edwin Mendez
                                      Pipe Fitting Pro L.U.597
                                           Chicago

[Non-text portions of this message have been removed]

Texas Flange - a good source for information on industrial flanges, all they ask is for referrals for designs they help with. 877-610-8924.
www.texasflange.com

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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Thu Aug 15 10:04:00 2002