CN Series
ANSI CN Series Water Centrifugal Pump
End-suction water pump built to ANSI/ASME B73.1 with a full open impeller and ANSI B16.5 flanges
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Pump Category
CN Water Centrifugal Pumps
The CN is the Flowsteer ANSI series: 1 inch to 10 inch, capacity to 400 m³/h, full open impeller and a single mechanical seal.
Products
Pump in This Category
The Problem
What This Category Is For
Choosing an ANSI pump is only half the decision. The other half is the frame, the flange rating and the casing material, and those are what determine whether the pump survives the water it is asked to move. The CN series publishes all three so the selection can be made before the order rather than after the failure.
Who It Suits
- Buyers who have already settled on ANSI/ASME B73.1 and need the specification
- Engineers sizing a power frame against a known duty point
- Plants running treated effluent that will rust a cast iron casing
- Contractors matching a pump to a 150LB or 300LB pipe class
Problems It Solves
- Frame sizes chosen by guesswork rather than by duty
- Casing material that does not match the water analysis
- Flange ratings discovered to be wrong on site
- Open impeller clearances left unset after commissioning
ANSI B73.1 CN series end-suction centrifugal pump with open impeller and cast iron casing
Advantages
Why This Category Is Built the Way It Is
- Published size band1 inch through 10 inch with capacity to 400 m³/h.
- Four frames to choose fromS, M, L and XL power frames rather than one frame stretched across the range.
- Four casing materialsCast iron, ductile cast iron, carbon steel and SS304.
- Externally adjustable clearanceOpen impeller clearance is reset from outside the casing, which restores head without a strip-down.
Typical Application Scenarios
- Return activated sludge transfer on a waste water works
- Filter and clear well duties inside a potable water plant
- Wash-down and general service water on an industrial site
- Like-for-like replacement of an existing B73.1 pump
Where It Is Used
Industries That Specify This Category
Industry
Waste Water Treatment
Open impellers, polymer wetted parts and vertical sump pumps for screened sewage, return sludge, effluent and pit drainage.
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Industry
Municipal Water Supply
Transfer, distribution and booster duties on city water networks, with EN733 and ANSI footprints and a bronze impeller as standard.
Read moreQuestions
CN Water Centrifugal Pumps FAQ
What does CN stand for in the Flowsteer range?
CN is the Flowsteer series designation for its ANSI/ASME B73.1 end-suction pumps. The series covers 1 inch to 10 inch.
How do I choose between the S, M, L and XL frames?
The frame is selected from the duty point and the driver, because it sets the shaft diameter and the bearing size. Send us the flow, the head and the motor rating and we will name the frame.
Which casing material should I specify?
Cast iron for clean and screened water, ductile cast iron where pressure or pipe loading is higher, carbon steel where a steel casing is specified, and SS304 for treated effluent and process water that would rust iron.
Is head published for the CN series?
No. The source catalogue publishes size and capacity but not head or speed, so we mark those TBC. Send the duty point and we will confirm.
Specify a CN Water Centrifugal Pump for Your Duty
Send the flow, head, supply frequency and liquid description and we will confirm the size and the published specification for it.