Blue vertical inline centrifugal pump with flanged connections

Selection Guide

Horizontal Or Vertical Centrifugal Pump Which One Fits Your Plant Room

Both families move the same water. The choice is decided by floor space, pipework, maintenance access and how the set will be serviced in ten years.

The Hydraulics Are The Same The Installation Is Not

A single stage end suction impeller does the same job whether the shaft is horizontal or vertical. What changes is where the pump sits, how the pipework reaches it and what has to be dismantled to change a seal.

That is why two plants with identical duty points end up with different pumps. The decision is about the room, not about the curve.

Choose Horizontal When Floor Space Allows

A horizontal set sits on the floor with suction and discharge in the pipework around it. The SKW family is close coupled, which removes the coupling and the separate baseplate and cuts the footprint compared with a traditional set. The SKS family keeps the coupling, which costs floor area but lets the seal be serviced without disturbing the motor.

Horizontal pumps also make bearing and seal inspection straightforward, because everything is at working height.

See the SKW Horizontal Centrifugal Pump specification →

Choose Vertical Inline When The Pipe Run Decides

A vertical inline pump drops into the pipe run, with suction and discharge on the same centreline. In a plant room where the pipework is already routed, that removes bends and the floor area a horizontal set would need.

The SKG family covers the same duties in vertical form, with chemical, hot water, high temperature and oil variants matching the horizontal range.

See the SKG Vertical Centrifugal Pump specification →

What Actually Decides It

Run through these five points before choosing. If three or more favour one orientation, that is your answer.

Floor area available and whether the pump can be reached from all sides
Whether the pipework is already fixed or can still be routed
Headroom above the pump for lifting the motor and rotating element
Who will service the pump and what tools they have
Noise and vibration transmitted to occupied space above the plant room

Do Not Let Orientation Hide A Sizing Error

Neither orientation rescues a pump that is too large. A set running against a throttled valve wastes power and wears the seal whichever way the shaft points.

Fix the duty point first, including static lift and real pipe losses. Then pick the orientation that fits the building.

Catalogued flow range	1.5 to 1500 m3/h
Maximum head	150 m
Maximum drive rating	160 kW
Maximum caliber	500 mm
Standard fluid temperature	up to 80 degrees Celsius

Answers

Questions From Buyers

Is a vertical pump less efficient than a horizontal one?

Not inherently. Efficiency follows the hydraulic design and how close the duty point is to the best efficiency point, not the orientation of the shaft.

Which is easier to maintain?

A coupled horizontal set is usually easiest for seal work because the motor stays in place. A close coupled pump has fewer parts to align. A vertical inline pump needs headroom for lifting.

Does orientation affect NPSH?

The pump requires what it requires, but the installation changes what is available. Suction line layout, lift and liquid temperature matter more than orientation.

Can I replace a horizontal pump with a vertical one?

Only if the pipework can be reworked. The connections sit differently, so it is a pipework decision rather than a straight swap.

Which family should I ask you to quote?

Send flow, head, liquid, temperature and a photograph or sketch of the plant room. We will propose the orientation with the model.

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