How To Size Water Supply Piping For Wascomat Coin Laundries; Gallons Per Minute Flow Chart; Installation - Wascom EMERALD W75ES Operating & Maintenance Manual

How to size water supply piping for Wascomat coin laundries

1. Calculate the total number of gallons of water that would be needed if all present (and
future) washers were to fill at the same time. Assume the W75 (18-lb.) uses 7 gallons
per fill; W105 (25-lb.) uses 10 gallons per fill; W125 (35-lb.) uses 14 gallons per fill‚
W185 (80-lb.) uses 20 gallons per fill; and W244 (75-lb.) uses 30 gallons per fill. If
water pipe runs of 70 feet or longer are required, multiply by 1.25 to compensate for
pipe friction which reduces flow rates.
2. Using the Flow Chart below and knowing the water pressure in the water main at your
store, select a pipe diameter that has a gallons per minute (gpm) flow rate the same or
higher than the total calculated above. The hot water line and the cold water line
supplying the washers must each be this size diameter, since many fills are all hot or
all cold. This will assure fill times of approximately 1 minute and normal cycle times.
Wascomat washers are designed to operate at 25–85 PSI Call your local water utility
company if you do not know the water pressure in your water main.
Pipe internal
Diameter, Inches
1/2
3/4
1
1-1/4
1-1/2
1-3/4
2
2-1/2
3
3-1/2
4
5
6
3. The water line from the laundry to the water main in the street must carry double the
total gallons capacity calculated in paragraph 1. Select the correct diameter from the
Flow Chart. (You will note from the chart that two 2'' pipes do not equal the flow rate of
a 4 inch pipe; two 1'' pipes do not equal the flow rate of a 2 inch pipe, etc... Use the
correct gpm flow rates!)

Installation

GALLONS PER MINUTE FLOW CHART

Water pressure from the water main
25 psi 40 psi
21 gpm 27 gpm
36 46
63 85
112 148
160 210
209 273
257 335
419 548
580 760
650 840
720 920
1500 1960
1930 2530
60 psi 80 psi
33 gpm 37 gpm
56 64
104 120
181 208
257 297
334 385
410 473
670 772
930 1070
1025 1185
1120 1300
2400 2770
3100 3580
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