level calibration

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Thread Starter

Anonymous

our problem is closed tank nitrogen blanketing with methylene chloride tank. we are not able to calculate the DP .so can u give a solution with good example.
 
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A.Ramachandran

A guided wave radar could be a solution. However to confirm the suitability one needs to to know the tank height, MoC of tank, is the tank lined...
 
The problem with a DP measurement is not clear. What's to calculate other than to correct for specific gravity?

Presumably the DP low side is piped to the top of the tank and senses the nitrogen blanket pressure and the DP high side is piped to the bottom of the tank and sees the liquid head pressure and the nitrogen pressure.

The specific gravity (SG) of methylene chloride is approx 1.3.

The DP cell is calibrated for the specific gravity of water. To correct or compensate for SG, divide the head pressure units (in water column units) by the specific gravity.

Level measurement (water column units)/Specific gravity = actual level

For example, a measurement of 150 inches (water column) head pressure divided by 1.3 = 115.4 inches of methylene chloride.

David
 
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