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REFERENCE
What Pump Capacity would be required to handle the drainage from a 4 bathroom home, also including a dishwasher, a washer, a laundry tray, a kitchen sink,
water softener, basement shower, a 13,000 gallon pool, and a bar sink (1-1/2" trap)?
1. From Figure 1:
EXAMPLE SIZING PROBLEM
GUIDELINES FOR SIZING
Description Fixture Units
Four bathroom groups 24
Water softener 4
Dishwasher 2
Washing machine 2
Laundry tray 2
Kitchen sink with disposal 3
Basement shower 2
Swimming pool 13
Bar sink (unlisted 1-1/2") 3
FIXTURE UNITS TOTAL 55
2. Refer to Figure 2: Find 55 fixture units on the horizontal axis. Follow vertically until intersecting the line then horizontally to the left. The Pump Capacity on
the vertical axis is 30 gpm.
Determine the Total Head of the installation illustrated in Figure 3, the Typical Installation Illustration:
1. That Static Head in this instance is 7 ft.
2. Friction Head:
• Since the required Pump Capacity in this illustration of 30 gpm is less than the 46 gpm necessary to carry solids through 3" pipe, 2" or 2-1/2" pipe
should be used. If 3" pipe is preferred or required, a Pump Capacity of at least 46 gpm is required.
• Measurement of the length of the discharge pipe totals 200 ft.
• Refer to Figure 6 and note the friction factor in equivalent feet for each fitting:
3 - 90° elbows, 2" 16 - equivalent feet
1 - gate valve, 2" 1 - equivalent foot
1 - swing check valve, 2" 17 - equivalent feet
Total: 34 equivalent feet
Adding 34 ft to the measured pipe length, the total eective pipe length becomes 234 ft or 2.34 100 ft increments.
• Refer to Figure 4, find the 30 gpm required Pump Capacity on the left scale and follow over to the 2" PVC pipe size column. Friction Head is 1.8 x 2.34 = 4.2 ft.
3. Total Head Required: Total Head = Static Head + Friction Head
• Example: Total Head = 7 + 4.2 Total Head = 11.2
Due to the existence of water closets in this installation, a pump with 2" Solids Handling capacity should be used unless otherwise specifically stated by
applicable codes. Use Figure 7 to select pump. To determine the Basin size, find the Pump Capacity (30 gpm) in the column on the left of Figure 6. Any Basin
diameter of 18" or greater is acceptable. Since this application is domestic, a Simplex System is sucient.
Summary: Recommended selections for this installation would be a Simplex System utilizing an 18" or greater diameter Basin and a 2" Solids Handling pump
capable of delivering at least 30 gpm at 11 ft.
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