How to determine whether we should use a flange or threaded connection for Pressure transmitter??
How to determine whether we should use a flange or threaded connection for Pressure transmitter??
(OP)
How to determine whether we should use a flange or threaded connection for Pressure Gauge & transmitter?? Is there any rules, advantages, disadvantages that u can help me with???. thanks





RE: How to determine whether we should use a flange or threaded connection for Pressure transmitter??
RE: How to determine whether we should use a flange or threaded connection for Pressure transmitter??
As with many of these these sort of installation issues there may be guidelines, but in my experience a lot is based on company specs and requirements.
There have been some failures of screwed connections, especially when they have been cross threaded or use of too much ptfe tape and hence some companies ban or discourage screwed gauges.
With transmitters you need to consider the weight of the entire unit on a small connection and often it's better to mount them remotely and pipe to them.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: How to determine whether we should use a flange or threaded connection for Pressure transmitter??
RE: How to determine whether we should use a flange or threaded connection for Pressure transmitter??
Directly threading a transmitter to piping is not recommended, since you'll have to disconnect the wiring to tighten the threaded joint if it leaks. If you're going to use a union to provide that point of rotation, use the 2-bolt I flange instead.
Transmitters are limited in maximum service temperature to well within the limits of useful, reliable thread sealant compounds. Leakage should not be an issue. However, in some services, even tiny amounts of leakage are potentially catastrophic. In those cases, use the I flange- and weld the I flange to the piping, block valve etc.
Transmitters operating at temperatures above which the transmitter can handle are fitted with either impulse legs or diaphragm seals. Diaphragm seals are flanged to piping. Impulse legs can be made from pipe but are generally made from tubing with compression fittings.
RE: How to determine whether we should use a flange or threaded connection for Pressure transmitter??
Check your process fluid.