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Hello to all,
Recently, me and my colleagues had very interesting discussion about shrink/swell effect of boiler steam drum. Shrink and swell effect is always present when there are sudden changes in steam or feedwater flow. On most drums, level is measured by differential pressure transmitters. Dp measurement must include steam table correction on pressure and temperature in order to have accurate reading. Now if pressure is changing inside a drum, can effect of shrink/swell be reduced in measurement reading if pressure and temperature correction is used? In other words, if correction is used will dp transmitter show less shrink/swell level change?
I think not, becaase when pressure changes, correction will help to get more accurate reading of actual level inside the drum, but because of presence of steam/water mixture,shrink and swell will have same impact on reading no matter if correction is used.
What do you think about this?
Recently, me and my colleagues had very interesting discussion about shrink/swell effect of boiler steam drum. Shrink and swell effect is always present when there are sudden changes in steam or feedwater flow. On most drums, level is measured by differential pressure transmitters. Dp measurement must include steam table correction on pressure and temperature in order to have accurate reading. Now if pressure is changing inside a drum, can effect of shrink/swell be reduced in measurement reading if pressure and temperature correction is used? In other words, if correction is used will dp transmitter show less shrink/swell level change?
I think not, becaase when pressure changes, correction will help to get more accurate reading of actual level inside the drum, but because of presence of steam/water mixture,shrink and swell will have same impact on reading no matter if correction is used.
What do you think about this?