Maximum Motor Power; Maximum Specific Gravity - Finish Thompson DB22 Series Assembly, Installation And Operation Manual

Maximum Allowable Motor Power
Do not exceed 7.5 kW (10 horsepower) for 50 Hz, 2900 rpm applications. For 60 Hz, 3450 rpm applications, the pump is capable of
starting a 15 horsepower motor but is limited to a maximum of 13 horsepower (9.7 kW) while running. Use the information in the chart
below to determine the maximum specific gravity capabilities by impeller trim for non-overloading applications. The use of a power
monitor is strongly recommended for 60 Hz applications above 10 horsepower (7.5 kW).
Maximum Specific Gravity for Non-Overloading Applications
3450 rpm (60 Hz)
Closed Impeller
Diameter
7.25" (184.2 mm)
7" (177.8 mm)
6.5" (165.1 mm)
6" (152.4 mm)
5.5" (139.7 mm)
5" (127.0 mm)
4.5" (114.0 mm)
3450 rpm (60 Hz)
Open Impeller
Diameter
6" (152.4 mm)
5.5" (139.7 mm)
5" (127.0 mm)
4.5" (114.0 mm)
Maximum
Specific Gravity
1.0
1.1
1.5
1.8
1.8
1.8
1.8
Maximum
Specific Gravity
1.5
1.8
1.8
1.8
2900 rpm (50 Hz)
Closed Impeller
Diameter Specific Gravity
184.2 mm (7.25")
177.8 mm (7")
165.1 mm (6.5")
152.4 mm (6")
139.7 mm (5.5")
127.0 mm (5")
2900 rpm (50 Hz)
Open Impeller Maximum Specific
Diameter
181.0 mm (7.13")
177.8 mm (7")
165.1 mm (6.5")
152.4 mm (6")
139.7 mm (5.5")
10
Maximum
1.35
1.6
1.8
1.8
1.8
1.8
Gravity
1.35
1.5
1.75
1.8
1.8