Instrument Mounting for Gas Service

It is possible, however, consideration needs to be given to the prospect of liquid building up in the pipe and causing the instrument to give a pressure error equal to the difference in elevation multiplied by the density of the liquid multiplied by acceleration due to gravity. If that is tiny in comparison to the signal, it could be ignored. If the tapping line can be regularly drained safely, then that is another option. A third possibility is to mount the instrument off to the side at the same elevation where access can be gained to it more easily.

There is no such thing as <...normal practice...> beyond that in the facility's internally-published Instrumentation Standards Manual and site circumstances will direct the way forward.

Adding one more point to the above question.. In case if the instrument is at an accessable height can we directly mount the instrument side ways on a vertical line.( on the isolation valve directly threaded. Or should we have to mount the transmitter also vertically such that there is no condensate at the instrument end?

"Follow the instrument manufacturer's recommendations."

I completely agree PW. All of the manufacturer's of this type instrument publish extensive support information, usually available on-line. There's really no other way to go than their recommendations. Here, for example, is a file I pulled up in about 10 seconds:

https://www.honeywellprocess.com/library/support/Public/Documents/34-ST-25-35.pdf

I've installed many pressure transmitters in the last 39 years, and I ALWAYS read and follow the information provided. If I can't get the info I need, I call tech support.

Did they transmit the data with symaphores 39 years ago?

Almost:

or:

That's good info Iris.

Please clarify "fluel".