Pressure Tap in steam line

In the top of the pipe. Usually, pressure gauges on steam have a "pigtail loop" in the connecting pipe, which collects condensate, and buffers the gauge against pressure surges in the pipeline.

What does the end Client's piping standards say on this subject?

Ok thank you for your help.

But the steam pipe is 5ft above the floor. So the sensing line should decresing from the pressure tap to the transmitter. therefore i don't need a "pig tail", or need?

What the best installation to the transmitter? Above or under the pipe?

Sounds like you are installing a steam flow meter with density compensation. To ensure that the meter is reading correctly:

1. The pressure gauge should be installed the correct distance from the meter, and located on the top of the pipe (when flowing horizontally). A pig tail should be used (check manufacturer's instructions).

2. The flow meter has a required upstream and downstream pipe diameter requirement. Check with the manufacturer to verify and install per their instructions.

3. Most flow meters need to be properly inserted in the line correctly. Verify with the manufacturer's installation & maintenance instructions.

4. Moisture entrained in the steam can damage a flow meter, so a moisture separator and a "Y" strainer wiht a 100 mesh SS screen will ensure longer, more reliable service.

I always put the tap in the top 1/2 of a horizontal steam line so you will not pick up a bunch of condensate in your branch line from the bottom of the trunk line. The pig tail is necessary on a gauge because it gives a water buffer between the gauge and the steam and won't ruin the gauge. If you are going down to a lower elevation for you instrument it shouldn't mater as you will always have condensate in the line before your gauge sort of like a p-trap so to speak. If you do not desire or need the water buffer then install a steam trap in the line before the instrument.

pipewelder

So, the same conditions to install a pressure transmitter. I nedd the "pig tail"? Or the slope in my sensing line is enough?

The slope should go descending from the tap to the filing tee or pot? To ensure that condensate don't returns to the process line? (the steam of this line will be use in steam turbine)

I think the slope is sufficient in the case of a pressure transmitter. We have an arrangement drawing that shows the correct way to install the pressure transmitters that we use in the paper mill but I have not been able to locate yet. If I find it I will post it, keep in mind though different transmitter manufacturer's may require other set ups. Can you provide me with a manufacturer brand name and/or number for the transmitter you intend to use? One thing I didn't mention earlier is that when we use 2 transmitters with flow orifices and flanges the taps are usually located at the 3:00 or 9:00 position weather tapped into the orifice flanges or in the pipe on each side of the orifice to provide a differential pressure reading.

pipewelder

The manufacture brand is Emerson (model: 2088G4S22A1B4Q4 0-110 bar). The design conditions are T=800K; P=84bar).

Hello, try this and see if this helps. If not look around on the Emerson site for the manual for your product and go to the installation section. I am sure they have a drawing of what you seek. There are some good notes as to the installation of thier transmitters in steam service there too.

http://www.emersonprocess.com/rosemount/document/man/4797man.pdf

pipewelder

i want to ask about the tapping points for the flow are vertical

what's the right installation for the flow transmitter above or below the tap point

Please refer to ISO 2186-1973 or latest version ISO 2186-2008. In this standard all cases are clearly described

What is the ideal position for fixing Pressure Gauge/Transmitter in Primary Centricleaner pipeline--whether it should be located before or after the Inlet valve in inlet piping and where should it be located in accepts line-before accepts valve or after accepts valve?