DUTY CYCLE
Most rotary gear pump manufacturers have a medium-duty and heavy-duty pump line to cater for a wide variety of applications. Medium duty gear pumps will generally only have one bearing and be suitable for lower pressures and more intermittent duties. The heavy-duty gear pumps are to be used on higher pressure applications and/or continuous duties. The heavy-duty pumps will generally have a plain bearing behind the rotor and a ball bearing supporting the shaft.
FLOW
Internal gear pumps can deliver flows in excess of 2000 litres per minute, but several factors need to be considered. Pumps need to have enough atmospheric pressure to support the desired flow. Good manufacturers will have accurate information on the Net Inlet Pressure Required. Other factors also need to be considered, such as shear sensitivity, viscosity and abrasiveness, all needing levels of speed reduction.
DIFFERENTIAL PRESSURE
Rotary gear pumps will have certain pressure ratings for heavy duty vs medium duty pumps and will probably have different pressure ratings for pumps with different construction materials. Better gear pumps will have pressure ratings to 300psi [20.7 bar], but this will be for lubricating fluids. Fluids with low viscosities will reduce the maximum pressure a pump can produce.
The pressure will also affect seal selection. Some mechanical seals are only rated to 11 bar, whereas some cartridge seals are rated up to 40 bar. Most packing options will be rated to the pump’s maximum, but some special purpose packing may not, so this needs to be checked.
O-rings should also be considered [if available] instead of gaskets to minimise the chances of leaking.
VISCOSITY
The viscosity of a fluid affects many aspects of a rotary gear pump selection. For low viscosities, bronze bushings should not be used. For high viscosities, the speed of the pumps must slow down, often requiring reduction gearboxes. Some manufacturers [like Gorman-Rupp] have designed pumps with larger in-feed areas which enables them to support higher flows of viscous fluids while running at pole speeds, needing gearboxes only when viscosities are very high.
When viscosities get high, manufacturers will often recommend changing cast iron rotors to steel ones, which will have an effect on price. Other manufacturers have standardised on ductile iron rotors, which means that these pumps can transition into higher viscosity fluids with standard [less expensive] rotor material.
The viscosity also affects seal selection. For intermediate viscosities [up to 5000 cSt], positive drive mechanical seals can be used, but beyond this, double seals [up to 10,000 cSt], triple lip seals [up to 440,000 cSt] or packing [up to 440,000 cSt] need to be selected.
CORROSIVE FLUIDS
Gear pumps are often asked to pump corrosive fluids, and most manufacturers will have a stainless steel construction option. But sealing materials are also important. Materials such as Viton®, Teflon®, Chemraz® and Kalrez® are useful materials to resist corrosion. O-ring and gasket material also needs consideration.
ABRASIVE FLUIDS
Rotary gear pumps can be effectively applied to abrasive fluids. Some manufacturers have a special pump range to cater for this, inclusive of hardened internal metal components and needle bearings instead of plain ones. But there are other considerations depending on the abrasiveness of the application. Idler pins can be supplied in tungsten, bushings can be tungsten carbide coated or produced in silicon carbide. Mechanical seals should also have hard faces [such as silicon carbide].
HIGH TEMPERATURE FLUIDS
Pumping fluids at high temperatures is quite possible with an internal gear pump, provided the manufacturer has the appropriate options. The internal gears will more than likely need to be trimmed to compensate for expansion, but other components in the pump will need to be upgraded. The bushings could be upgraded to “High-Temperature Carbon Graphite”, or “High-Temperature Silicon Carbide”, with a “High-Temperature Idler Pin, which would be suitable for temperatures up to 360oC.
Seals are also extremely important, and materials like Teflon for o-rings and high-temperature graphoil or chemraz® need to be considered.
Liquids that are successfully pumped with Internal Gear Pumps include [but not limited to]:
FOOD INDUSTRY
Liquid Sugar
Chocolate
Brewer’s Yeast
Corn Syrup
Molasses
Fats
Liquid Margarine
Vegetable Oils
Shortening
Fish Solubles
Hot Oils
CHEMICALS
Paint
Inks
Solvents
Resins
Acetone
Alcohols
Methanol
Pigments
Polymers
Toluol
Ethyl Acetate
GENERAL
Adhesives
Bitumen
Heat Transfer
Cutting Oils
Glycerine
Starch
Sulphites
Anhydrous Ammonia
Glycol
Foam Systems
Bonding Agents
HYDRO-CARBONS
Oils
Grease
Aviation Fuel
Diesel
Hydraulic Fluid
Propane
Butane
Ethane
Methane
Petroleum
Watch this instructional video showing how simple the maintenance activities are for Gorman-Rupp surface mounted self-priming pumps.
INTRODUCTION AND SAFETY
BACK COVER AND WEAR PLATE REMOVAL
SUCTION CHECK VALVE REMOVAL
ROTATING ASSEMBLY REMOVAL
CARTRIDGE SEAL REMOVAL
SHAFT AND BEARING REMOVAL
CARTRIDGE SEAL INSTALLATION
IMPELLER INSTALLATION AND ADJUSTMENT
ROTATING ASSEMBLY INSTALLATION
BACK COVER INSTALLATION
PRESSURE RELIEF VALVE MAINTENANCE
SETTING PACE CLEARANCE
Our expert team is standing by for any questions you have about how best to configure your pump system.
Internal Gear Pumps:
Download the Brochure | Ask Our Team
Ragazzini Peristaltic Pump are at the cutting edge of “Hose Pump” design and have the features to make pumping easier. They consist of an elastomeric tube that is squeezed along its length by rollers that push the fluid contained within. This creates a gentle pumping action that doesn’t cause damage to the product. Further advantages include:
- Handle a range of applications including food products, abrasives, chemicals and solids
- High performance including pressures to 15 BAR, reversible flow, and suction lifts
- Easy maintenance including easy hose replacement and easy leak detection
- CIP with retractable rollers
- Greater operator safety
- Easy access for monitoring or service
- A variety of hose materials to handle food, pharmaceuticals, abrasive and/or corrosive fluids
Download the Brochure | Ask Our Team
The Gorman-Rupp Super T Series self-priming centrifugal wastewater/sewage pump has been the world benchmark for this technology since 1963 (>50 years). They have been designed for economical, trouble-free operation, with superior solids handling capability and a large inspection cover to access pump internals for service or blockage removal.
Advantages include:
- Self-Priming pump has the ability to mount high and dry above the wet well (not in it)
- Low cost of ownership
- Greatly reduced OH&S issues – no more working over water/heights/cranes/heavy swinging weights
- Surface-mounted pumps with easy access for monitoring or service
- Advanced safety features including pressure relief valve to protect operators
- Improved maintenance features to greatly reduce maintenance time and costs, with removable rotating assembly
- A variety of materials of construction to handle abrasive and/or corrosive fluids
Ask Our Team
The Gorman-Rupp G Series range of self priming positive displacement rotary gear pumps is designed to provide superior performance in the transfer of process fluids, unmatched in the industry. Available in Medium-Duty , Heavy-Duty and Extreme-Duty (abrasive service) models, gear pump materials include cast iron, cast steel and stainless steel.
G Series self priming pumps are manufactured with unique features that enable them to perform better and last longer on countless applications, providing quality and reliability that make the G Series the premier gear pump in the industry.
Advantages include:
- An automatic idler pin lubrication system uses the pumped fluid to continuously cool and lubricate the idler pin and bush to reduce wear in this area.
- An internal seal cavity venting system provides a continuous flow of liquid through the seal area, ensuring cooling and reducing pressure. This reduces seal face
- load, increasing seal life.
- A deep “end-feed” area offers superior priming performance under low inlet pressure conditions and/or high viscosity liquids.
- Easy to service
- Viscosities to 440,000 cSt
- Pressures to 20.7 bar (300 psi)
- Flows to 2200 litres per minute
- Handle a variety of liquids , including highly viscous, high temperature and abrasive fluids
- Widest range of sealing options in the industry
- High strength gear material eliminates the need for special steel fittings traditionally needed for viscous applications.
- Widest range of housing ports
- Widest range of bushing materials
Ask Our Team
The Gorman-Rupp Super U Series self priming dewatering and grey water pumps combines the best features of quality trash pumps in Australia with increased fuel efficiency and higher heads to pump through smaller and/or longer discharge piping systems or overcome the losses in filter systems.
These centrifugal pumps have been designed for economical, heavy duty (24/7) trouble-free operation.
Advantages include:
- Ability to mount high and dry above the water (not in it)(to 7.6m)
- Low cost of ownership
- Greatly reduced OH&S issues
- Easy access for monitoring or service
- Advanced safety features to protect operators
- Improved maintenance features to greatly reduce maintenance time and costs, with removable rotating assembly
- A variety of materials of construction to handle abrasive and/or corrosive fluids
- Any engine brand required by the customer
- Choice of skid or trailer mounted configuration
Ask Our Team
Ragazzini Rotho Peristaltic Pumps are the ideal choice for dosing and metering.
They consist of an elastomeric tube that is squeezed along its length by rollers that push the fluid contained within. This creates a gentle pumping action that doesn’t cause damage to the peristaltic pump.
Advantages include:
- Handle a range of fluids including viscous products, abrasives and chemicals
- High performance including pressures to 15 BAR, reversible flow, and suction lifts
- Accurate metering as well as high flows (to 180m3/hour)
- Easy maintenance including easy hose replacement and easy leak detection
- CIP with retractable rollers
- Greater operator safety
- Easy access for monitoring or service
- A variety of hose materials to handle food, pharmaceuticals, chemical, abrasive and/or corrosive fluids
Ask Our Team
The EDUR LBU multiphase pump is a multi-stage centrifugal pump with the unique capability of being able to pump a liquid/gas mixture. The centrifugal pump is constructed of either C.I./ Bz/ SS, Nodular Cast Iron, All-Bronze, Stainless Steel, or Super-Duplex Stainless Steel construction, so may be used to handle a variety of liquids.
Air, Oxygen, Carbon Dioxide and Ozone gases can be introduced into the suction line and transported and used to mix or disperse the gases. This makes the pump ideal for DAF plants, where the multiphase pumps provide the task of air saturation without the use of compressed air (no compressor, air saturation tank or associated controls).
Advantages include:
- Liquid flows to 16 l/s
- Gas content up to 20%
- Cast iron/Bronze/Stainless steel, Nodular cast Iron, All-Bronze, Stainless Steel, or Super-Duplex Stainless Steel construction
- Completely replace the “old” DAF system with a single pump
Download the Brochure | Ask Our Team
The Lampo emergency response trailer unit is designed to speed up and simplify the deployment of emergency response equipment for municipalities, emergency services and contractors.
Advantages include:
- Enables deployment of multiple pieces of equipment, using only one vehicle.
- Diesel-driven power generator complete with variable frequency drive [VFD] powers a lighting tower and a rugged and reliable Gorman-Rupp pump.
- The cleverly designed unit can light up a work area while operators set up the self-priming pump or operate numerous electric tools from the power generator.
- The VFD allows for soft starting electrical equipment, including the pump, and can vary the speeds of these machines to suit the duty at hand. While all this is happening, the compressor can be driving air nibblers, air-operated nail guns, wrenches or tyre inflators.
- The Lampo units also come standard with an air compressor, discharge hose reel, suction hoses and a robust mounted toolbox.
The central components of the Lampo – the generator, VFD and lighting system are manufactured by quality equipment manufacturer, Euromacchine in Italy. They are housed in an acoustically rated enclosure constructed from powder-coated galvanised steel plates.
The Lampo emergency response unit are then mounted on an Australian heavy-duty built hot-dip galvanised double axle trailer and fitted with a self-priming Gorman-Rupp trash pump.
Our Team is available to answer your pump query within the hour
Hydro’s experts are standing by to help you get the best pump, aerators and genuine spare parts for your specific project.
or Call
(02) 9898 1800
Monday – Friday
9am – 5pm
Australia Wide
