SG Gravel Sand Pump — Solids to 254 mm, No Liner to Break
Single-casing gravel pump for continuous transport of coarse, strongly abrasive material. Nine sizes, solids 82–254 mm, capacity to 1060 L/s.
SG series gravel pumps move highly abrasive material whose particles are too large for an ordinary slurry pump — continuously, and without a liner to break. Nine sizes passing solids from 82 mm to 254 mm.
- Single-casing construction with a wide flow passage — no liner to fail
- Solids to 254 mm; capacity to 1060 L/s; head to 66 m
- Discharge rotatable through a full 360° for any installation geometry
- Wetted parts in hard nickel and high-chrome wear-resistant metal
- Belt-driven arrangement
- Packing or expeller seal — each with a defined operating limit
CE · EAC · ISO 9001 · ISO 14001 · ISO 45001
Overview
The SG series is built for the continuous transport of strongly abrasive material with particles too large for an ordinary slurry pump to handle. It suits dredging, river desilting, and slag transport in mining and metal smelting. The SGH build covers the same duty at higher head.
Construction is single-casing: there is no separate liner inside a pressure shell. On material this coarse a liner is broken rather than worn, so the full casing wall is made of wear-resistant metal instead — hard nickel or high chrome. The flow passage is wide, and the discharge can be set to any position through a full 360°, which is what makes the pump fit an existing dredge or plant layout.
Model Designation
Example: 6/4D-SG
| 6 | Pump inlet diameter in inches |
|---|---|
| 4 | Pump outlet diameter in inches |
| D | Frame type |
| SG | Gravel pump |
| SGH | High-head gravel pump |
Performance Data — Clear Water
For preliminary selection. Slurry duty is derated against solids concentration and particle size; the performance curve is issued with the quotation.
| Model | Capacity (L/s) | Head (m) | Speed (r/min) | Efficiency (%) | NPSHr (m) | Inlet (mm) | Outlet (mm) | Max particle (mm) |
|---|---|---|---|---|---|---|---|---|
| 6/4D-SG | 10–70 | 3.5–51 | 600–1400 | 30–50 | 2.5–3.5 | 150 | 100 | 82 |
| 8/6E-SG | 38–160 | 10–48 | 800–1400 | 50–60 | 3–4.5 | 200 | 150 | 127 |
| 10/8S-SG | 60–272 | 13–50 | 500–1000 | 45–65 | 3–7.5 | 250 | 200 | 178 |
| 10/8F-SG | 60–272 | 13–50 | 500–1000 | 45–65 | 3–7.5 | 250 | 200 | 178 |
| 12/10F-SG | 100–420 | 11–58 | 400–850 | 50–70 | 2–4.5 | 300 | 250 | 220 |
| 12/10G-SG | 100–420 | 11–58 | 400–850 | 50–70 | 2–4.5 | 300 | 250 | 220 |
| 14/12G-SG | 140–880 | 6–66 | 300–700 | 60–68 | 2–8 | 350 | 300 | 241 |
| 18/16G-SG | 240–1060 | 9–48 | 250–500 | 60–72 | 3–6 | 450 | 400 | 254 |
| 18/16T-SG | 240–1060 | 9–48 | 250–500 | 60–72 | 3–6 | 450 | 400 | 254 |
Shaft Sealing — Two Arrangements, Two Limits
Both arrangements work, but each has a hard limit that belongs in the plant design rather than in commissioning.
- Packing seal — for suction or backflow conditions. The seal water pressure must be 35 kPa higher than the pump outlet pressure, at the flow rate set by frame size.
- Expeller seal — generally for backflow conditions. The backflow head must not exceed 10 % of the pump total head, and shaft power rises by roughly 5 % because the expeller itself absorbs power.
Selecting an SG Pump
- Largest particle first. It sets the minimum size regardless of flow and head. The range passes 82 mm on 6/4D through to 254 mm on 18/16.
- Then concentration and density. The head the pump must generate scales with mixture density.
- Then the duty point. Flow and head become meaningful once the first two are fixed.
- Then the seal. Check the backflow head against the 10 % limit before assuming an expeller will do.
What to Send With Your Enquiry
Send the largest particle size reaching the suction, the solids concentration and mixture density, the flow and total head including the discharge line, the backflow head if any, and the drive arrangement. We will confirm the model and the wear material and issue the performance curve.
More Pictures
Send Your Enquiry
| Model designation | Example 6/4D-SG: 6 → inlet diameter in inches, 4 → outlet diameter in inches, D → frame type, SG → gravel pump (SGH = high-head gravel pump) |
|---|---|
| Frame sizes | 6/4D, 8/6E, 10/8S, 10/8F, 12/10F, 12/10G, 14/12G, 18/16G and 18/16T |
| Inlet diameter | 150 to 450 mm |
| Outlet diameter | 100 to 400 mm |
| Capacity | 10 to 1060 L/s |
| Head | 3.5 to 66 m |
| Speed | 250 to 1400 r/min |
| Maximum particle size | 82 to 254 mm, according to frame size |
| Efficiency | 30 to 72 %, according to frame size and duty point |
| NPSHr | 2 to 8 m |
| Shaft sealing | Packing seal — seal water pressure 35 kPa above pump outlet pressure. Expeller seal — backflow head not to exceed 10 % of pump total head |
Why is there no replaceable liner?
On material this coarse a liner is broken rather than worn, and the load then passes to a shell never designed to carry it. Single-casing construction puts the full wall thickness in wear-resistant metal instead.
How large a particle will it pass?
From 82 mm on the 6/4D through to 254 mm on the 18/16 sizes. The figure for each model is in the performance table.
What is the difference between SG and SGH?
Same duty, higher head. SGH is the high-head build of the series.
What pressure does the seal water need?
For packing, 35 kPa above the pump outlet pressure, at the flow rate set by frame size.
When can we use an expeller instead of gland water?
Where the backflow head does not exceed 10 % of the pump total head. Note that shaft power rises by roughly 5 % because the expeller absorbs power.
Can the discharge orientation be set on site?
Yes — the discharge can be positioned anywhere through a full 360°.
Manufacturer-direct supply · Technical pump-selection support · Export documentation on request.
