550W Pump Casing
The same construction as the 200 W body taken up a frame size: taller barrel, larger suction eye, and a noticeably heavier section through the foot.
At 184 × 99 × 234 mm and roughly 4.1 kg in grey iron it is more than double the metal of the 200 W casing. Most of that extra goes into the foot and the wall behind the chamber, because the larger impeller puts more radial load into the same three mounting points.
Running it as a separate pattern rather than a machined variant of the smaller body is deliberate. The section changes are in the casting, not in the cutter path — which is cheaper at 100 pieces and gives a better grain structure where the load actually is.
| Envelope | 183.8 × 98.6 × 233.7 mm |
| Cast volume | 564.7 cm³ |
| Weight, grey iron | approx. 4.07 kg as-cast |
| Casting process | Vertical-line sand moulding on two lines (national patent) |
| Materials | Grey iron · ductile iron · WCB carbon steel · CF8M stainless |
| Machined features | Chamber steps and bolt circle · top port thread and pad faces · foot underside |
| Minimum order | 100 pieces |
| Certification | EN 10204 3.1 per heat, spectrometer results |
| Source of geometry | Your drawing, 3D file or a worn sample |
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.
Heavy foot needs directional solidification
The foot is the thickest section in the part. It has to feed last, or it shrinks and leaves porosity exactly where the hold-down bolts pull.
Same core box family as the 200 W
Chamber cores share tooling geometry across the frame sizes. Fewer core boxes to store, fewer to get mixed up on the line.
Section change under the barrel
Wall steps from the barrel into the foot in one radius rather than a corner — a sharp corner there is the classic hot-tear site on a casting this size.
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. |
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 |
|---|---|
| Frame size and impeller diameter | Confirms it is the 550 W body and not the 370 W |
| Port thread and orientation | Thread standard plus which way the discharge points |
| Alloy | Grey iron is standard here; ductile if the duty is cyclic |
Related Castings
Other parts in the same range — all shown as 3D models you can turn.
