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Vortex Impeller

Recessed into the casing. Solids pass through on the vortex without touching it.

Vortex Impeller

Recessed into the casing. Solids pass through on the vortex without touching it.

The impeller sits back out of the flow path and spins the liquid into a vortex; the solids ride that vortex through the casing and out of the discharge. Most of what is pumped never touches the impeller at all.

It is the least efficient construction there is and it is specified anyway, because in sewage and in solids-laden duty an impeller that never touches the solids does not wear and does not block. Uptime beats efficiency in that service.

Casting process	Vertical-line sand moulding on two lines (national patent)
Materials	Grey iron · ductile iron · WCB carbon steel · CF8M stainless
Machined features	Bore and keyway · hub face · vane face · balance correction
Minimum order	100 pieces
Certification	EN 10204 3.1 per heat, spectrometer results
Source of geometry	Your drawing, 3D file or a worn sample

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Casting Notes

What Is Difficult About This One

Every casting has one or two features that decide whether the batch repeats. On this part they are these.

Recessed vanes, deep pattern

The vanes sit back inside the hub. The draw is deeper than it looks and the taper has to hold all the way in.

Thick sections where it does get hit

Whatever does reach the impeller arrives at full velocity. Section is generous rather than optimised.

Hub is the feed path

Metal is fed through the hub outward into the vanes, so the hub is the last thing to freeze.

Materials

Alloy Options

The same geometry is a different part in three different plants. Chloride content, abrasion and temperature drive the choice — not the name of the fluid.

Alloy	Grade	When it is the right choice
Grey iron	HT200 / HT250	Default for water duty. Damps vibration, machines easily, lowest cost.
Ductile iron	QT450 / QT500	When the duty is cyclic or the part takes shock. Tougher than grey.
WCB carbon steel	ASTM A216 WCB	Higher strength, weldable. For pressure-bearing bodies.
CF8M stainless	ASTM A743 CF8M	Chloride and corrosion duty — the cast equivalent of 316.

Enquiry

What to Send Us

These are the ones specific to this part. A drawing, a 3D file or the worn original covers all of them at once.

Item	Why it matters
Solids size and type	The largest sphere that has to pass, and what it is made of
Shaft diameter and key size	Bore and keyway
Casing recess depth	How far back the impeller has to sit