hswang2
Civil/Environmental
- Oct 27, 2006
- 53
As we know that D/P level transmitter’s sensing line going to the upper tank
Connection becomes a “reference leg” of constant pressure head.
Care must be taken in applying reference legs when the atmosphere may
Alternate from condensing to non-condensing. So, wet-legs defines as that it
Can dry out over a period of time or a dry-leg may begin to fill with liquid.
If a diaphragm and capillary sensing system should be considered, it is definitely choose the dry leg instead of wet leg.
I&C staff ask us to fill out the process fluid vapor pressure for them
Unfortunately, one D/P LT located at high pressure water vessel OP~18 barg
So in this case, what is vapor pressure of water at 18 barg?
And, I am not sure this vapor pressure value for wet leg is used for.
Is that mean the higher the vapor pressure can drive the transmitter more efficiently or other reason.
Please help me out.Thank you very much for your help.
Connection becomes a “reference leg” of constant pressure head.
Care must be taken in applying reference legs when the atmosphere may
Alternate from condensing to non-condensing. So, wet-legs defines as that it
Can dry out over a period of time or a dry-leg may begin to fill with liquid.
If a diaphragm and capillary sensing system should be considered, it is definitely choose the dry leg instead of wet leg.
I&C staff ask us to fill out the process fluid vapor pressure for them
Unfortunately, one D/P LT located at high pressure water vessel OP~18 barg
So in this case, what is vapor pressure of water at 18 barg?
And, I am not sure this vapor pressure value for wet leg is used for.
Is that mean the higher the vapor pressure can drive the transmitter more efficiently or other reason.
Please help me out.Thank you very much for your help.
