Question 1: A steam drum has a total height of 37 inches. A differential pressure transmitter is connected to two taps to measure the level of the tank. The bottom tap (high side) is connected 3 inches above the bottom of the drum. The top tap (low side) is connected 2 inches from the top of the drum and it has a condensate pot to keep it filled with water. The drum contains water and the safe operating level ranges between 6 inches and 32 inches from the bottom of the steam drum. The transmitter is mounted 8.8ft below the bottom of the drum.
If the transmitter should be calibrated for the safe operating level of the steam drum, what pressure values should it be calibrated for?
a. Zero=-29.0inH2O
Range=-3.00inH2O
b. Zero=-26.0inH2O
Range=0.00inH2O
c. Zero=35.0inH2O
Range=61.0inH2O
d. Zero=112inH2O
Question 2: A DP level transmitter is connected to a 29.2 ft tank with a dual diaphragm seal system. The high leg is connected to the tank 1ft above the bottom and the low leg is connected to the tank 1.5ft below the top. The tank has a typical operating level of 3-26ft. The seal fluid has a specific gravity of 1.1 and the process fluid has a specific gravity of 0.91.
If the transmitter is mounted 4.2ft above the top of the tank, what should the pressure calibration values be for the typical operating levels?
a. Zero=-330.6inH2O
Range=-79.44inH2O
b. Zero=374.3inH2O
Range=625.4inH2O
c. Zero=-319.7inH2O
Range=-68.5inH2O
d. Zero=460.4inH2O
Range=711.6inH2O
Question 3: A DP based level transmitter is connected to a 48 inch steam drum to measure level. The transmitter is connected with a condensate pot on the low leg. The bottom tap is 4 inches above the bottom of the steam drum and the top tap is 2 inches below the top of the steam drum and the transmitter is mounted 3.2 feet below the bottom tap. If the transmitter should be calibrated from the bottom tap to the top tap, what pressure values should it be calibrated for?
a. Zero=38.40inH2O
Range=80.40inH2O
b. Zero=0.000inH2O
Range=42.000inH2O
c. Zero=-46.00inH2O
Range=0.000inH2O
d. Zero=-42.00inH2O
Range=0.000inH2O
Question 4: A boiler steam drum has a DP based level transmitter connected to it. The low side of the transmitter is connected to the drum using a wet leg and a condensate pot.
The low side of the transmitter develops a leak, resulting in the wet leg slowly draining. What would happen to the indicated level (would it increase, decrease, or remain correct)?