1. Start with the slurry

The HAD series is described as hard metal/rubber heavy duty slurry pumps designed for the most difficult pumping applications: high abrasive, high density or erosive slurry. Examples given include aggressive duties such as mill discharge and tailing transportation.

For these duties, the product description points to:

• Extra thick sections at wear points
• An impeller structure intended for long life with minimal maintenance

If your slurry is a low density slurry, look at the alternatives before settling on HAD.

2. Check head and capacity against the published range

These are series ranges. They are not a performance guarantee for a particular size. Your duty point (flow, head, solids content and particle size) still has to be matched to a specific model and impeller. Send us your process data for sizing.

3. Choose the wet-end material

The listed HAD material options are Cr27, Cr28, CD4MCu and rubber liner material. The design supports this choice in a few ways:

• The impeller may be either moulded elastomer or hard metal.
• Hard metal and moulded elastomer liners are interchangeable.
• Rubber-lined pumps extend the application range to handling chemical products, and several rubber options are offered for different needs.

The published material does not include a corrosion or chemical compatibility chart. If your slurry contains chemicals, confirm the elastomer or alloy choice for that specific fluid before you order.

4. Decide on the shaft seal arrangement

The seal choice affects how the pump ties into your site utilities:

• Centrifugal seal: according to the product description, a large percentage of duties allow it, and it removes the need for sealing water.
• Packed gland seal: available with either a low flow or a full flow flush seal water arrangement.

If gland seal water is limited at your site, ask whether a centrifugal seal suits your duty. If your duty needs a gland, plan the flush water supply for the arrangement you choose.

5. Mechanical design and maintenance fit

Published HAD design features that matter for installation and upkeep:

• Shaft and bearings: a large diameter shaft with a short overhang to minimise deflection and vibration. Heavy-duty roller bearings sit in a removable bearing cartridge.
• Pump base and adjustment: a minimum number of through bolts hold the casing to the frame, and impeller adjustment is provided in a convenient position below the bearing housing.
• Outer casing: split outer casing halves of cast or ductile iron contain the wear liners and provide high operating pressure capabilities.
• Impeller: deep side sealing vanes relieve seal pressure and minimise recirculation. Cast-in impeller threads are better suited for slurries.
• Liners: mating faces in hard metal liners are tapered for positive alignment during assembly and easy removal for replacement. Hydraulic seal rings seal between mating faces.

About AH replacement

The product name describes HAD as a replacement for AH. If you plan to fit HAD into an existing AH installation, or to mix spare parts, confirm footprint, flange and parts interchangeability for your exact model with our engineers. The published description does not give a dimensional cross-reference.

6. When HAD may not be the right fit

Other heavy duty slurry pumps suit different conditions:

To summarise: if you need multi-stage high pressure, look at HADPP. If your slurry is low density, look at WAD. If you want a volute built to handle larger particles, look at HSD. For high abrasive, high density or erosive duties such as mill discharge and tailings, HAD is the starting point.

7. What to send for a quotation

To match a heavy duty slurry pump to your duty, please share:

• Slurry type, solids concentration, specific gravity and particle size
• Required flow and total head
• Any chemical content in the fluid
• Seal water availability
• Existing pump model, if you are replacing one

This article does not state pricing, lead times or certifications. Hebei Xiangmai Pump Co., Ltd. will confirm these for each enquiry.