Extended Bearing Housing
A longer barrel, putting the bearing centre further out from the wet end.
Moving the bearings away from the pumped fluid is done for two reasons: heat, and room. On hot service the extra length keeps the bearing oil below the temperature where it stops being oil. On any service it leaves space for a longer seal chamber.
The cost is overhang. A longer shaft between the impeller and the front bearing deflects more for the same radial load, so the housing section and the foot both go up to compensate. It is not the standard housing with a spacer — it is a different casting.
| Casting process | Vertical-line sand moulding on two lines (national patent) |
| Materials | Grey iron · ductile iron · WCB carbon steel · CF8M stainless |
| Machined features | Both bearing seats · mounting face · spigot register · seal chamber face |
| 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.
Longer barrel, same concentricity requirement
The two seats are further apart, so any bow in the casting shows up as a larger misalignment. Stress relief matters more here than on the short housing.
Heavier section, more feeding
More metal and a longer path to feed it. Risers are sized for the barrel, not for the average wall.
Foot moved and re-ribbed
It sits differently relative to the bearing centres than on the standard housing, so it is not interchangeable — check the pitch before ordering.
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 |
|---|---|
| Bearing designations and centre distance | The distance is what makes it the extended version |
| Service temperature | The usual reason for choosing extended over standard |
| Seal chamber length | Whether the extra room is for a cartridge seal |
