ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 374

ELMRIDGE
APPLICATION EXAMPLES
EXAMPLE 1:
The volume of a rectangular process tank is 5,000 US gallons (approximately 10'W x 15'L x 4.5'H). In order that the
contents of the tank remain in homogenous solution, it is necessary that the tank volume be completely turned over (ie.
completely recirculated), in a period of approx. 8 minutes. It has further been determined that eductor spacing not exceed 3'
in order to utilize the eductor outlet plume to further agitate the bottom corners of the tank. There is an existing single header
of sufficient capacity centered longitudinally along the bottom of the tank, and a pump that will supply sufficient volume at 30
psig.
1. Four eductors spaced on 3' centers on each side of the header pipe will meet the necessary spacing requirements.
2. The number of eductors required is:
3. Total required recirculation flowrate is:
4. Required recirculation flowrate per eductor is:
5. An ME20 eductor has a circulated flowrate of 83 usgpm at 30 psig., therefore a quantity of (8) ME20 eductors could
be used.
6. The nozzle flow of an ME20 eductor at 30 psig is 21 usgpm, therefore, the pump must be able to supply:
EXAMPLE 2:
A steam-jacketed hot oil (S.G. = 1.21), preheat tank is 20' high and 10' in diameter (approx. 11750 usgal).
It is desired that a single eductor using a portion of the total oil inflow turn over the contents of the tank in
approx. 12 minutes in order to reduce temperature gradients within the tank. Pump pressure must also be
approximated; assume inflow rate is sufficient.
1. The static discharge pressure that the pump must overcome is:
2. Total required recirculation flowrate is:
4 An ME60 eductor has a circulated flowrate of 1091 usgpm at 30 psig, however, the pump must be sized to supply the
ME60 nozzle flowrate of 218 x SQRT(1/1.21) = 198 usgpm at:
®
Liqui-Jet
®
4 x 2 sides = 8 eductors
5000 / 8 min. = 625 usgpm
625 / 8 eductors = 78.1 usgpm
8 x 21 = 168 usgpm at 30 psig
20 x 1.21 = 24.2 feet of water
11750 / 12 = 979 usgpm
30 + 10.5 = 40.5 psig
Dimensions and Specifications are subject to change without notice
Mixing Eductors
= 10.5 psig
ME Series
34
E-1367