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Boiler drum level measurement problem with DP transmitter

Boiler drum level measurement problem with DP transmitter

Boiler drum level measurement problem with DP transmitter

(OP)
Hi sir
For level measurement of boiler drum I want to instal DP transmitter at a low elevation of drum, and filled low side of transmitter with water by using condansate pod.
I calculated LRL and URL of transmitter.
When I looked at rosemount calculation document (attached file), there are small difference, because of steam height pressure.
 
Does height of saturated steam act transmitter?
Saturated steam look like gas, its pressure must press everywhere of drum, look like gases.
Isn't it?

For a normal Drums (not boiler drum) , there are 2 phase,  gas and liquid.
when we connected Differential pressure transmitter,
Low side of transmitter pressure measure= Drum pressure
High sideof transmitter  pressure measure= Liquid height pressure and Drum pressure
Transmiiter substract these pressure and find olny  Liquid height pressure .

For boiler drums (on attached file):
Low side of transmitter pressure =  drum pressure (OK)
High sideof transmiiter  pressure = Liquid height pressure and  saturated steam height pressure and drum pressure
Transmiiter substract these pressure and find  Liquid height pressure with saturated steamheight pressure.

Is it normal, Does height of saturated steam act transmitter?
Saturated steam look like gas, its pressure must press every where of drum look like gases.Isn't it?

It is not liquid, does it have height pressure??

Can u look at attached calculation?

Thank you


 

RE: Boiler drum level measurement problem with DP transmitter

(OP)
Attached file  

RE: Boiler drum level measurement problem with DP transmitter

the steam density is rarely taken into account in low pressure boilers, but as your calc sheet suggest it can have an effect
that cannot be ignored....

you can calculate the error   

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