HG/GH high head gravel slurry pump adopts wide-channel semi-open impeller, mainly for large-size sand, river dredging and dredger sand pumping. Single-stage head ranges 5–80m, capable of passing large cobbles & slag, balancing high head and large particle passage capacity, widely used in dredging, sand mining and steel plant slag delivery.
1. Double Pressure-Bearing Casing
Outer ductile iron shell bears pipeline pressure; inner replaceable high-chrome volute liner & frame plate liner. Thickened casing for high-pressure working conditions; worn liner can be replaced separately without whole pump casing change to cut maintenance cost.
2. Special Thickened Closed High-Head Impeller
Enlarged outer diameter & extended blade hydraulic profile, higher pressure boosting capacity than AH pump at same rotation speed; fully cast A05 high-chrome alloy with thick blades for severe abrasion resistance. Auxiliary back vanes on impeller backside reduce slurry pressure entering shaft seal cavity.
3. Oversized Heavy-Duty Bearing Cartridge
Widened bearing span with double spherical roller bearings, oil lubricated with cooling chamber; counteract huge axial thrust generated under high head, stable 24h heavy-duty operation without overheating or axial shifting.
4. Multiple Shaft Seal Options
Optional expeller seal (zero leakage), packing seal, cartridge mechanical seal. Expeller + mechanical seal combination is preferred for long-distance high-pressure transportation to avoid slurry leakage damaging bearings.
5. Multiple Transmission Modes
Flexible coupling direct drive, V-belt drive, reduction gearbox, fluid coupling. Discharge outlet can be adjusted to 8 angles at 45° intervals to match complex pipeline layout.
- Single casing with quick-release clamp design for fast disassembly & sand cleaning;
- Larger suction inlet, superior NPSH anti-cavitation performance than HH;
- Thicker wear parts for sand & cobble medium, not suitable for fine mineral slurry.
Motor drives main shaft and high-head impeller to rotate at high speed, slurry flows axially into pump chamber:
1. Extended curved blades of HH pump pressurize slurry step by step, realizing ultra-high single-stage head to overcome long pipeline friction loss;
2. Wide channel impeller of HG pump has narrow clearance free design, sand & cobbles pass integrally without clogging;
3. Pressurized slurry converts kinetic energy to static pressure inside volute and discharges for long-distance pipeline delivery;
4. Negative pressure barrier formed by impeller back auxiliary vanes blocks high-concentration abrasive slurry from invading seal cavity, extending seal service life.
If system total head exceeds single-stage limit, multiple HH pumps can be connected in series to stack total pressure, replacing costly multi-stage slurry pumps.
1. Ultra High Single-Stage Head
Ordinary AH slurry pump max single-stage head only 50m, HH reaches up to 92m. Single unit completes long-distance tailing & concentrate transportation, cutting equipment investment and pipeline loss without multiple pumps series/parallel connection.
2. Full Metal Superior Wear Resistance
No rubber lining, all wetted parts made of A05 high-chrome alloy, resist severe erosion from coarse ore & steel slag without rubber tearing or swelling failure.
3. Heavy-Duty Anti-Axial Thrust Design
Oversized bearing housing & double roller bearings, low vibration under high-pressure high-head condition, bearing service life doubled for year-round continuous concentrator operation.
4. Series Connection Available for Pressure Boost
When total required head over 90m, 2+ HH pumps can be installed in series, applicable for underground mine dewatering, tailings backfill & deep well ore slurry lifting.
5. Stable High-Pressure Sealing
Expeller pressure relief structure greatly reduces mechanical seal bearing pressure, slurry leakage rate much lower than standard slurry pump for high-concentration medium delivery.
2. Large bore wide channel, anti-clogging for sand & weeds;
3. Quick clamp casing, efficient on-site cleaning of sand sediment.
2. Hydraulic efficiency of HH impeller slightly lower than AH, higher power consumption under same flow rate;
3. HG inferior to HH on abrasion resistance, only for sand dredging, not fine high-abrasion mineral circulation.
- Suction & discharge diameter: 25–150mm (1–6 inch)
- Flow rate: 5.4–900 m³/h
- Single-stage head: 15–92m, max 200m+ via multi-stage series
- Max slurry concentration by weight: ≤60%
- Allowable solid particle size: ≤12mm hard ore & tailings
- Matched motor power: 7.5–315kW
- Wetted material: A05 high-chrome alloy (metal only)
HG/GH High Head Gravel Pump
- Nominal diameter: 100–400mm
- Flow rate: 36–5040 m³/h
- Head: 5–80m
- Max passable solid particle: 50mm sand & cobble
- Max mud concentration: ≤45%
1. Ferrous & Non-Ferrous Mine: Long-distance tailing transportation, underground backfill, thickener underflow, long-distance concentrate delivery;
2. Coal Washing Plant: Long-distance dense medium transfer, high-pressure coal slurry delivery;
3. Metallurgical Steel Mill: Iron oxide scale water, high-pressure steel slag slurry transportation;
4. Thermal Power FGD: Long-distance gypsum bleed slurry, emergency slurry recirculation back to absorber;
5. Non-Metallic Ore: Fluorite, graphite tailings long-distance conveying.
HG/GH Gravel Pump
1. River dredging, dredger sand pumping, wharf sand extraction;
2. Construction foundation pit sand mud pumping, tunnel shield slag discharge;
3. Steel plant steel slag, quarry crushed stone slurry transportation;
4. River silt cleaning, fish pond silt with sand delivery.
| Single-Stage Head | 15–92m for high-pressure long pipeline | 5–50m for medium-low head short circulation |
| Wetted Material | Only high-chrome metal, no rubber liner | Dual options: metal / rubber lining |
| Impeller Profile | Extended thickened hydraulic design for high pressure | Standard short blade general impeller |
| Axial Bearing Capacity | Heavy double roller bearing, resist high-pressure thrust | Light bearing, easy overheat & axial shift under high head |
| Series Connection | Allowed for pressure boosting | Not recommended, easy seal leakage under high pressure |
| Applicable Solids | Medium-coarse hard abrasive ore slurry | Universal for fine & coarse particles, rubber liner for fine corrosive slurry |
| Typical Working Condition | Tailing backfill, long-distance pipeline transportation | Flotation cell, thickener short circulation |
2. HG/GH gravel pump for medium with large cobble, river sand & dredging; HH for pure mineral processing slurry.
3. Adopt two or more HH pumps connected in series for ultra-high head over 100m.
4. Choose rubber-lined AHR pump instead of HH if medium contains weak acid & fine particles without large lumps.
5. Equip oil-lubricated bearing + expeller seal for 24h continuous high-pressure production.
6. Reserve 20% margin for flow & head, long-distance pipeline brings severe pressure loss.
2. Replace lubricating oil every 2000 running hours for oil-lubricated bearing; refill grease every 500 hours for grease-lubricated model.
3. Flush pump chamber thoroughly with clean water after each shift shutdown to prevent solidified slurry jamming impeller.
4. Inspect liner & impeller wear regularly; abrasion rate under high head is higher than ordinary slurry pumps.
5. Disassemble quick-release clamp of HG gravel pump after each shift to clear sand & weeds wrapped on impeller.
6. Fully drain slurry inside pump for long-term shutdown, coat anti-rust grease on all high-chrome wetted parts before storage.
