Why This Frame Still Matters
The ANSI B73.1 medium frame is one of the most widely installed process pump sizes in the world. Plants keep them running for decades, which means the demand is not for new pumps — it is for wet-end parts that fit pumps whose original documentation was lost two maintenance managers ago.
- Closed and semi-open impellers
- Volute casing and pump cover
- Bearing housing, bearing cover and motor bracket
- Mechanical seal gland and gland cover
Who Buys These Parts
For Pump Repair Shops
Single replacement parts, quoted from the worn component, with the interfaces measured rather than looked up.
For Aftermarket Distributors
Repeat batches of the fast-moving wet-end items, packed and labelled for your stock system.
For OEM Brands and Assembly Plants
Build-to-print supply under your drawing revision control, with first-article approval before series release.
For Plant Maintenance Teams
Casing and impeller cast to the same drawing set, so the running clearance is right the first time instead of a year later.
Interfaces We Confirm Before Cutting Metal
These surfaces decide whether the part drops in. Every one is confirmed against your part or print rather than a catalogue number.
| Interface | How it is established |
|---|---|
| Impeller OD | Confirmed against your part or drawing — sets head at a given speed |
| Bore & keyway | Measured on the existing shaft, not taken from a catalogue |
| Hub height | Sets axial position relative to the casing face |
| Vane count & profile | Matched to the original hydraulic design |
| Rotation | Confirmed from the pump — a mirrored part looks right and pumps badly |
| Casing register | Cast and machined so the impeller sits central in the volute |
Frequently Asked Questions
What is the difference between the closed and semi-open impeller for this frame?
The closed version holds its clearance at replaceable wear rings and is more efficient. The semi-open runs against the casing face, tolerates solids and can be re-shimmed in service instead of replaced.
What is your minimum order quantity for this frame?
100 pieces. We are a foundry rather than a repair shop, so parts are cast and quoted in batches.
Do you supply bare castings or finished parts?
Both. Bare castings suit shops with their own machining capacity; the default is fully machined, balanced and inspected.
Can you manufacture for frames that are no longer supported?
Yes — that is the normal case. We work from the worn part, since no current drawing is generally available for a discontinued frame.
What documentation ships with each order?
EN 10204 3.1 material certificate per heat, dimensional report against the agreed revision, and the balance report stating the grade achieved.
Do you ship internationally?
Yes, with export packing for sea or air freight. Destination and Incoterms are agreed on the quotation.