Flat End (Cylindrical) Tank Volume Calculation - ABB Platinum standard Series Product Instruction

WBPEEUI110504A0
4. The secondary upper range value is the full volume of the
tank which depends on the tank and the process.
NOTE: The empty and full volumes do not include the tank base.
The volume only includes the spherical portion of the tank.
Example: A Type PTSDDD pressure transmitter is installed as shown in Figure 2-7, and
will be configured in the United States. The tank is filled with water (specific
gravity = 1.0). The transmitter has an upper range limit of 360 inches of water.
The cell is mounted 180 inches below the bottom of the sphere. The sphere
itself is 150 inches in diameter. The empty volume is zero and the full volume
is 7,650 gallons. The compensating leg shown in Figure
1. Calculate the empty tank pressure as the primary lower
range value. Since the cell is below the bottom of the sphere by
180 in., the primary lower range value is equal to 180 in. H
2. Calculate the primary upper range value. The full pressure
is equal to 150 in. H
was calculated as the primary lower range value, the primary
upper range value must be equal to 150 plus 180, or
330 in. H O.
2
3. The secondary lower range value is the empty volume of
the tank (always zero).
4.The full volume of the tank is calculated to be 7,650 gallons
for the secondary upper range value.
volume of sphere
volume at any height (h) in tank
3
×
in. 0.004329

FLAT END (CYLINDRICAL) TANK VOLUME CALCULATION

Figure 2-8 shows a flat end (cylindrical) tank setup. This is a
general purpose tank. This procedure shows how to calculate
the values entered into the transmitter (via the Type STT ter-
minal) during configuration if VOL./TANK is chosen from the
OUTPUT TYPE menu.
1. The empty tank pressure is the primary lower range value.
a. If the location of the cell is at the bottom of the tank,
then the primary lower range value is 0.00 kilopascals
(0.00 inches of water).
b. If the location of the cell is below the bottom of the
tank, as shown in Figure 2-8, then offset the zero by set-
ting the primary lower range value to the pressure corre-
sponding to the distance between the bottom of the tank
and the cell times the specific gravity of the liquid.
DESCRIPTION AND OPERATION
O, but since the zero offset of 180 in. H
2
3
4π r
3
---------- - in. and
=
3
1
2
-- - π h (
3 r h
= –
3
= gallons
FUNCTIONAL OPERATION
2-7 is a dry leg.
O.
2
O
2
3
) in.
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