ISG Vertical Inline Centrifugal Pump: Design, Range and Uses

The ISG is a single-stage, single-suction vertical centrifugal pump for clean water and liquids with similar properties. Its inlet and outlet are the same size and sit on one centreline, so it can be bolted straight into a run of pipe, much like a valve. The impeller is mounted directly on an extended motor shaft, which keeps the unit short and the footprint small.

What the design gives you

• A compact unit that takes little floor space and often needs no separate base frame
• Pipework that stays straight, because the pump sits in the line instead of beside it
• No coupling to align between pump and motor
• Easy service: the motor and impeller lift out upwards while the casing stays in the pipe

Range

Our ISG range runs from DN25 to DN400, with rated flows from about 2.8 to 1200 m³/h and heads up to 128 m. Smaller frames run at 2900 r/min; many larger frames are also offered at 1450 r/min for quieter, lower-head duty. Every build is listed in the pipeline pump selection table.

Limits to respect

• System pressure up to 1.6 MPa (suction pressure plus pump head)
• Solids no more than 0.1% by volume and 0.2 mm in size
• It is not self-priming: the casing and suction pipe must be full of water before starting

Where it is used

Building water supply and boosting, cooling water, circulating water in plants and HVAC systems, and general clean water transfer. For hot water, the IRG version is used; for corrosive liquids, the stainless steel IHG.