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Long-Head Casing

An extended nose barrel, for the higher head duty.

Long-Head Casing

An extended nose barrel, for the higher head duty.

The barrel ahead of the volute is longer, which leaves room for a larger impeller eye and a longer suction passage. That is what buys the extra head — and it is why a long-head and a short-head body are different patterns rather than the same casting cut to length.

Long and relatively thin is the harder shape to pour. The metal has to run the full length of the barrel before it starts to freeze, and the air it displaces has to get out at the far end. Both are gating questions, decided before the first mould is made.

Casting process	Vertical-line sand moulding on two lines (national patent)
Materials	Grey iron · ductile iron · WCB carbon steel · CF8M stainless
Machined features	Suction bore and register · joint face and bolt circle · discharge flange · foot
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.

Long draw needs consistent taper

Draft has to hold all the way down the barrel or the mould tears on the way off. On a long part, a taper that is fine at the top is not automatically fine at the bottom.

Fill before it freezes

Pouring temperature and gate area are set by the length of the run, not by the weight of the casting. This is where a long-head body differs most from a compact one.

Vent the far end

Air trapped at the nose gives blowholes in exactly the section that has to hold pressure. Vents go in the pattern.

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
Barrel length and suction bore	The two dimensions that make it a long-head rather than a short-head
Head duty	It tells us which body in the family you actually need
Mounting foot pitch	Long-head and short-head bodies rarely share one