PH and OŁ-A pumps
The PH and OŁ-A series pumps are intended for pumping liquids containing significant amounts of solid particles (sludge).
PH pumps are used in the mining industry in mineral processing and enrichment plants, in hydraulic backfilling and waste hydrotransport systems, as well as in other cases where pumping mixtures containing significant amounts of solids is required.
PH pumps are also produced in a version adapted to work in explosion-hazardous areas of underground mining plants, as group I category M2 devices.
Building Parameters & Construction
PH pumps are horizontal single-stage centrifugal pumps with a design adapted to pump mixtures of liquids and solids with abrasive properties. The inlet to the pump is located in the axis, and the discharge port in the basic version is directed vertically upwards, moved to the side in relation to the pump axis. If the installation requires it, it is possible to mount the pump spiral casing in a different position so that the discharge port is in a position other than vertical.
PH pumps have a double body. The outer body, consisting of the front and rear parts connected by tie bolts, is made of materials with high mechanical properties and is designed to transfer mechanical and pressure loads. The elements of the outer body are not exposed to contact with the pumped medium and therefore their strength does not deteriorate. The outer body is protected against wear by the elements of the inner body, which consists of front and rear protective walls (insert) and a spiral body. These elements are made of special construction materials (high-chrome cast steel) that are resistant to abrasion. Because they are not exposed to the loads carried by the outer body, these materials do not have to have high mechanical strength and can be used despite progressive wear.
PH pumps are equipped with closed impellers with a small number of thickened blades, which increases their service life and allows pumping larger solid particles. The rotors are equipped with unloading blades on the front and rear discs, limiting the penetration of solid particles into the shaft seal area and into the gap sealing the rotor neck. This gap is an axial gap, and its width, as it wears, can be adjusted without disassembling the pump by moving the entire rotating assembly together with the bearing body relative to the pump stator, using special adjustment screws.
Double Body Construction (Outer Load + Inner Wear Casing)
PH pumps have a double body. The outer body, consisting of front and rear parts connected by tie bolts, is made of materials with high mechanical properties to transfer mechanical and pressure loads without contact with the medium. The inner body consists of front and rear protective walls (inserts) and a spiral body made of high-chrome wear-resistant cast steel.
Configurable Discharge Orientation
The inlet to the pump is located in the axis, and the discharge port in the basic version is directed vertically upwards, moved to the side in relation to the pump axis. If the installation requires it, the spiral casing can be mounted in alternative positions so that the discharge port is oriented non-vertically.
Closed Thickened Impeller with Unloading Blades
Equipped with closed impellers with a small number of thickened blades, increasing service life and allowing larger solid particles to pass. Unloading blades on the front and rear discs limit solid penetration into the shaft seal and rotor neck sealing gap.
External Axial Gap Adjustment Without Disassembly
The rotor neck gap is an axial gap. As it wears, its width can be precisely adjusted without disassembling the pump by moving the entire rotating assembly with the bearing body relative to the stator using dedicated adjustment screws.
OŁ-A pumps are centrifugal, single-stage, horizontal pumps with a closed vane impeller and a collecting channel. The discharge port is located vertically and points upwards, the suction port - horizontally to the side.
The connections of the suction and discharge bodies can be rotated relative to the shaft axis. The flow system consists of an impeller, suction and discharge bodies limited by inserts made of abrasion-resistant materials. The elements of the flow system are attached to the stator assembly. The pump has a rope stuffing box with a water lock.
Horizontal Single-Stage Centrifugal Slurry Architecture
OŁ-A pumps are centrifugal, single-stage, horizontal pumps with a closed vane impeller and a collecting channel. The discharge port is located vertically pointing upwards, and the suction port is horizontally oriented to the side.
Rotatable Suction & Discharge Casing Ports
The connections of the suction and discharge bodies can be rotated relative to the shaft axis to accommodate diverse plant piping geometries and equipment alignments.
Abrasion-Resistant Flow Inserts Attached to Stator
The flow system consists of an impeller and suction and discharge bodies protected by inserts made of abrasion-resistant materials attached directly to the stator assembly.
Rope Stuffing Box with Water Lock Barrier
The pump features a heavy-duty rope stuffing box with a pressurized water lock barrier preventing abrasive particles from entering the packing zone.
Explosion-Hazardous Underground Mining Adaptation
PH pumps are produced in an explosion-proof PH-Ex version adapted to work safely in explosion-hazardous areas of underground mining plants as Group I Category M2 devices.
Execution Construction & Operating Limits
Standards & Certifications
Applicable Standards
EN 12162
European Safety Standard
Certified conformity with European Standard EN 12162 safety protocols and hydrostatic pressure integrity testing.
ATEX Directive
2014/34 / EU
Certified for explosion-hazardous areas of underground mining plants, approved as Group I Category M2 devices (PH-Ex version).
Materials & Special Executions
Standard Material Version Specifications
In the standard material version of the PH pump, wear-resistant alloy cast steel is used for the elements of the flow system. Gray cast iron is employed for elements of the bearing system. Carbon alloy cast steel and copper cast iron are utilized for other castings.
Available Special Engineered Versions
• Brine-Resistant Cast Steel
Special alloy cast steel construction engineered to withstand severe saline slurry, mine brines, and corrosive mineral slurries.
• Hot Water Version
Optimized thermal expansion geometries and heat-tolerant seals for hot water slurry and elevated process fluids.
• Series Connection Version
Reinforced casing and bearing assemblies specifically adapted for series staged operation in multi-stage slurry pipelines.
• PH-Ex Underground Explosion-Proof
Engineered and certified as Group I Category M2 equipment for explosion hazard zones in underground mining plants.
Need technical consultation or sizing for PH & OŁ-A slurry pumps?
Our Muscat engineering team provides slurry hydrotransport calculations, wear life estimates, and explosion-proof ATEX verification for mining plants across Oman.