We found that the Pressure reading in the upstream end of a rotameter placed in a compressed air circuit is not showing any pressure. The compressed air is coming through a header at the rated pressure of 50 psig. When we block the flow we see the pressure reading.

 

Arun,

Can you pl specify where the line heads after the rotameter?

Paras Parmar
Field Design Cell
Control Systems & Instrumentation

 

Arun,

Sorry, but Bernoulli beat you to it.

Better luck next time.

Gray

 

1. You are probably flowing too much air for your compressor to be able to keep up with. Choke off some flow and your pressure will come up.

2. As others posted, you are flowing air to where? if you are flowing to atmosphere then there will be no static pressure. (Refer to the Bernoulli comment)

 

1. You are probably flowing too much air for your compressor to be able to keep up with. Choke off some flow and your pressure will come up.

2. As others posted, you are flowing air to where? if you are flowing to atmosphere then there will be no static pressure. (Refer to the Bernoulli comment.)

 

Dear Friend,

Remove the rotameter and remove the choke at the upstream end.