Hello Team,
We are using Endress+Hauser DP Pressure level transmitter in our Diesel Tank. This Tank is installed as Horizontal position.

Pls see the attached file for Fuel tank. Tank Vertical height is 3000mm, Transmitter is installed at height of tank 200mm from bottom of tank. In old DP Level transmitter there is 3 mtr HP capillary connected to flange which is connected at tank fluid sensing point which is 200mm above from bottom. LP is connected to atmospheric pressure with small pipe. It is a closed tank, but venting pipe is open from top of the tank.
Pls help me to calculate the LRV & URV in mmH2O. SG is 0.9.

The new DP level transmitter doesn't have any HP 3 mter pipe, the transmitter is just attached to the pressure sensing flange. Kindly help me to calculate the LRV & URV, I never calculate the these values for horizontal tank.

Kindly share your valuable comments.

 

High side connected to tank
Low side open to the atmosphere (put a scintered filter in the line so bugs do not build a nest and plug the low side line)

1 inch = 25.4mm

LRV
LRV = 0.00" w.c. (water column)
The transmitter cannot 'see' any hydrostatic pressure below its zero point (center of the transmitter's high side diaphragm, center of the flange). So 200mm of liquid below the center line of the flange point is not reported as a measurement.
The 200mm offset is the tank's 'datum', zero measuring point.

URV
URV = physical height of the liquid column times the specific gravity of the fluid.

Physical height of liquid column
maximum tank level minus datum (URV elevation) = 3000mm - 200mm = 2800mm
2800mm * 0.9 S.G. = 2520mm hydrostatic pressure at maximum liquid height

2520mm/25.4mm/in = 99.21 in w.c. hydrostatic pressure at maximum liquid height

URV = 99.21 inches w.c. = the hydrostatic pressure of a 2800mm liquid column of diesel.

 

Thanks Mr. David_2 for your valuable reply.
Just want to conform that the calculation method is same for vertical and horizontal tanks.. No any difference.

 

Does a U-tube manometer read the correct level difference using a skinny hollow tube?

Yes, the same configuration works for raw level units.

But the interpretation of the 4-20mA signal to volumetric units is two very different different calculations.