how ranges is decided for drum level or dearator level,in
my pplant i have seen for boiler drum range is -1000 to
1000mmwc, while for dearator -2000 to 0 mmwc ,why they
decided to take this range ?
Answers were Sorted based on User's Feedback
Answer / vishal
In case of drum, it contains both water and steam and the
zero is located the midway to maintain optimum level in
drum say -30mm is maintained for safe boiler operation and
high levels are controlled to avoid water rushing to super
heaters and damaging turbine and simmilarily very low drum
levels are avoide to protect overheating of drum and
prevent excessive rise in drum metal temperatures. but in
case of deaerator we are only concerned with the actual
level present in it to indicate in control room.level
ranges are generally in accordance with the height and we
take 0 for min level and for eg 1000mm if the height is
1200 mm or equivalent for safe operations .
Is This Answer Correct ? | 9 Yes | 1 No |
Answer / tarique
to maintain your sp as per load control,for anti cavitation
in your system it will always monitor true value
Is This Answer Correct ? | 2 Yes | 4 No |
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HELLO FRENDS ,, I M IN THE MIDST OF TROUBLE .. JUST LITTLE HELP ME... SUPPOSE ,, I HAVE A CLOSE VESSELE TANK ( HEXANE MEDIA ) ,, I M USING ROSEMOUNT 2051 DPT FOR LEVEL APPLICATION .. ITS CALIBRATE RANGE IS.. . 0 TO 950 MMH20 ..I DID CALIBRATED DPT WITHOUT REMOVING IMPULSE LINE OF HIGH AND LOW TAPPING.. & WITHOUT DISTURB 3 WAY MANIFOLD..!!! BUT ,,, DURING CALIBRATION I SELECT RANGE BY HART LRV IS 900 MMH20 & URV IS 1300 MMH20 ,, BUT ,TANK LEVEL SOMETIMES 100 % AT 1100 MMH20 , SOMETIMES 1300 MMH20 ..IN THIS CONDITION .. WHOLE LOOP FAILED ,, MAIN THING IS THAT ,, HOW TO CUSTOME RANGE SELECT ?? AND IF I USED RANGE OVER THE ORIGINAL CALIBRATE RANGE ,,,THEN WHAT ERROR WILL BE COME ??? HOW TO ZERO CALIBRATION OF DPT... HOW TO ZERO TRIM BY MANIFOLD ?? AND FOR TANK LEVEL PURPOSE ... WHICH UNIT I CAN USE ??? IS THERE ANY CALCULATION OR CALIBRATION .. IF YEH .. THEN PLZ JUST GIVE ME CALIBRATION STEPS FOR DPT.. THANKS YOURSSSSSSS
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