Better Water EQASSY0.75KB2.03, Operator'S Manual

Page: 23 / 24

Better Water LLC; rev. Apr 2017
Page 19 of 20
Cartridge Based Pyrogen Filtration System
(2-4 Filters)
Operator Manual
CALCULATION for AREA of PIPE VOLUME
To calculate the cross sectional area of pipe, use the following formula: Area = pi x r
2
- pi =3.14
- r = radius ( which is ½ the diameter )
The following calculation uses a 1" diameter pipe as an example:
Calculate the cross sectional area of the pipe using the formula above:
1. Divide the diameter by 2 to get the radius in inches
1" diameter / 2 = 0.5 inches
2. Divide the radius by 12 to convert from inches to feet 0.5 / 12 = 0.0417 feet
3. Square the radius 0.0417
2
= .00174 sq ft
4. Multiply by pi 0.00174 x 3.14 = .00546 sq ft
Answer :
the area of a 1” diameter pipe is 0.00546 ft
2
3 FEET per SECOND FLOW VELOCITY RATES
Nominal Loop Pipe Inner Diameter
3/4" Teflon id = 0.60in.
3/4" schedule 80 pvc id = 0.74in
1" Teflon id = 0.88in
1" schedule 80 id = 0.96in
1 1/2" schedule 80 id = 1.48 in
3/4" (25mm) polypropylene id = 0.80in
1" (32mm) polypropylene id = 1.03in
1 1/2" (50mm) polypropylene id = 1.61 in
Nominal Flow Rates at 3 Feet per Second
3/4" Teflon = 2.64 gpm @ 3ft/sec (Nominal)
3/4" schedule 80 pvc = 4.02 gpm @ 3ft/sec (Nominal)
1" Teflon = 5.69 gpm @ 3ft/sec (Nominal)
1" schedule 80 = 6.77 gpm @ 3ft/sec (Nominal)
1 1/2" schedule 80 = 16.1 gpm @ 3ft/sec (Nominal)
3/4" (25mm) polypropylene = 4.70 gpm @ 3ft/sec (Nominal)
1" (32mm) polypropylene = 7.79 gpm @ 3ft/sec (Nominal)
1 1/2" (50mm) polypropylene = 19.0 gpm @ 3ft/sec (Nominal)
a . All 3ft/sec flow rates at the loop return flow meter are calculated for the loop inner diameter
only.
b. The above flow rates should be set with all dialysis machines running.
c. If bicarbonate or acid makeup water is required, both should have the proper flow controls to
maintain flow velocity.