Product Brochure

REFERENCE
Every centrifugal pump has a unique performance curve. This curve illustrates the relationship of flow (gpm) to pressure (total head) at any point. The pump
will operate at any point along this performance curve. Pump capacity is therefore the flow the pump will generate at any specific pressure. The object is to
select a pump whose performance curve passes either through, or close to, the design condition, preferably above. Refer to Figure 7.
Solids Handling requirements may be determined by local codes and/or by the type of application and types of solids anticipated. Unless otherwise stated by
codes, a sewage pump should have the capability of handling spherical solids of at least 2 inches in diameter in installations involving a water closet.
Basin Size selection is best accomplished by relating to required System Capacity as determined by the Fixture Unit method.
Figure 6 shows recommended basin diameters, assuming the normal pump dierential (distance in inches between turn-on and turn-o), and running time
ranges from 15 seconds to 4 minutes. Basin depth, however, should be at least 24 inches below basin inlet for most pumps and deeper where greater pumping
dierentials are anticipated.
NOTE: Since basin size is directly related to pump operation frequency, it is important to select a basin of sucient size to ensure that the pump does not short cycle.
The question of whether to use a Simplex or Duplex System depends on the type of installation and/or local codes. Generally, a determination can be made
using the following guidelines.
1. Domestic: Simplex System is usually adequate.
2. Commercial: Optional — Depending on the type of business and the need for uninterrupted sanitary drainage facilities.
3. Public or Industrial: Duplex System is essential.
While you are sizing the system and before you select the pump, you will need to know and consider or make allowances for the following:
• Volts/Phase/Hertz — What is available?
• Will the pump share a circuit?
• Does the home, business, etc. have circuit breakers or fuses?
• What is the breaker or fuse amp rating? Make sure it is enough.
• Check local or state codes for:
- Solid size requirements - Amp ratings/circuit cord size/ratings or type
- Pipe material/size/depth to bury - Tank size/location
• Are there plans for future expansion? As in, adding upstairs bath, basement plumbing, washing machine, etc.
PUMP SELECTION
GUIDELINES FOR SIZING
Basin Sizing
System Capacity (gpm)
Basin Diameter (Inches)
18" 24" 30" 36" 42" 48"
20
25
30
35
40
45
50
60
70
80
90
100
125
150
175
200
225
GALLONS/FOOT OF BASIN DEPTH 13.2 23.9 36.7 52.9 72.0 94.0
GALLONS IN 2-1/2' OF BASIN DEPTH 33.0 59.7 91.7 132.2 180.0 235.0
FIGURE 6
Select the minimum basin depth so that 2-1/2 ft of basin depth in gallons; pump capacity in gpm
Shaded cells highlight the acceptable basin size
104