Xylem Wastewater (Technical Manual) - Manual (Page 7)

PAGE 7
Wastewater
Goulds Water Technology, Bell & Gossett,
Red Jacket Water Products, CentriPro
WHAT DO YOU NEED TO KNOW TO SELECT A SEWAGE PUMP?
4. Formula for Total Dynamic Head:
Vertical elevation
+ friction loss (pipe + fittings)
+ Pressure Requirements (x 2.31')
Total head in feet
Note: Wastewater pumps are de-
signed to pump effluent with some
suspended solids, not solids with
some effluent.
5. Must maintain minimum velocity of 2
ft./second (see index).
6. Must turn storage in the discharge
pipe a minimum of one time per
cycle. (See index).
7. Are receiver basin and cover
required?
8. What is the power available?
• Phase – 1Ø or 3Ø
• Voltage – 115, 200, 230, 460 or
575 V
• Hertz – 50 or 60 Hz
9. What pipe size will be used?
10. Simplex or Duplex System?
(Duplex when service cannot be
interrupted)
Note: State and local codes take
preference.
FLOAT
SWITCH
ACCESS
COVER VENT
TO ELECTRICAL CON-
TROLS OR OUTLET
SWING
CHECK
VALVE
SHUT-OFF
VALVE
DISCHARGE
INLET
RECEIVER
BASIN
SUBMERSIBLE
WASTEWATER PUMP
1. Size solids to be handled.
• Effluent (liquid only) – <1"
• Residential – 1½" or larger
• Commercial/Industrial – 2½" or
larger
2. Capacity required.
• 1 bath – 20 GPM
• 2-3 baths – 30 GPM
• 4-5 baths – 45 GPM
3. Pump/Motor Run Time
Units up to 1½ HP should run a
minimum of 1 minute. Two (2) HP and
larger units should run a minimum of
2 minutes.
Wastewater Pumps Sizing and Selection