How to Select Gear Pumps        Image Credit: Grainger Industrial Supply | GRI Pumps | Johnson Pump   Gear pumps are positive displacement rotary pumps that transport liquids using rotating gears. They function through the use of two or more internal gears that create vacuum pressure, propelling the fluid media. Gear pumps are compact, high pressure pumps which provide a steady and pulseless fluid flow comparable to double diaphragm pumps and...
Learn More about Gear Pumps


Q & A on Gear Pumps

We asked our users for their input on Gear Pumps. Here are the results of 100 users familiar with Gear Pumps.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing gear pump design?
12 answers
Answers:
Materials used to manufacture pumps, New technology in the way they are manufactured. Improvements in design.
~Phill c. C, Hydraulic technician, Hobart, Australia
Sealless Pumps. New materials of construction. There is not a lot of improvement in gear pumps.
~Franklin H, Pump Product Manager, Zionsville, IN
New fluid types, tolerances, RPM capabilities, metallurgy
~Pat K, Owner, Hydraulic repair company/ EX USAF, Orangeville, Columbia
I guess Mag drive was new when I was selling Viking.
~Steve B, National Sales Manager, Melbourne, Australia
New applications, new industries
~Pedro Calisto, Marketing/Sales, Alverca, Portugal
Bearings, materials, gear design
~Stuart W, Engineer, Lanark, United Kingdom
Gear profile to reduce noise.
~Raymond A, Project Manager, Dordrecht, Netherlands
Sealless, Magdrive
~Delmiro A, Design Engineer, Guaruja, Brazil
Metaurgy,
~George K, Process Engineer, Cliffside park, NJ
MATERIALS
~STERGIOS ZARIFIDIS, General Management, Athens, GREECE
Mag drive
~Massimo S, General Management, Charlotte, Italy
Materials
~Cesar Calao, Engineer, Barranquilla, Colombia

Q:
From your perspective, which companies are creating the most innovative gear pumps?
10 answers
Answers:
Eaton, Vickers, Rexroth, Parker, Casappa
~Phill c. C, Hydraulic technician, Hobart, Australia
Parker, and sister companies
~Pat K, Owner, Hydraulic repair company/ EX USAF, Orangeville, Columbia
Viking, Gorman-Rupp
~Franklin H, Pump Product Manager, Zionsville, IN
Blackmer, Viking
~George K, Process Engineer, Cliffside park, NJ
Tuthill and HNP
~Ron T, Technical sales engineer Coriolis, Ruurlo, The Netherlands
Viking - Idex
~Steve B, National Sales Manager, Melbourne, Australia
Blackmer
~STERGIOS ZARIFIDIS, General Management, Athens, GREECE
Gearchem
~Cesar Calao, Engineer, Barranquilla, Colombia
Varisco
~Pedro Calisto, Marketing/Sales, Alverca, Portugal
Viking
~Delmiro A, Design Engineer, Guaruja, Brazil

Applications and UseTop

Q:
What are some of the applications you have used gear pumps for?
24 answers
Answers:
We produce Coriolis instruments and our instruments are frequently used in combination with gear pumps. Our PID control regulates the speed of the pumps and this makes dosing with gear pumps far more accurate (up to 0.2% reading). Since we also dose in mass-flow it is fluid independent, they are always accurate.
~Ron T, Technical sales engineer Coriolis, Ruurlo, The Netherlands
Suction boost pumps, fluid transfer, differential drives, low tech regenerative system in house, charge pump for hydrostatic system repair and or update.
~Pat K, Owner, Hydraulic repair company/ EX USAF, Orangeville, Columbia
Pumping Oil for many applications. Diesel Fuel for day tanks. Recently had one for pumping Glycol and water at -45 Deg. F. Asphalt.
~Franklin H, Pump Product Manager, Zionsville, IN
Many applications, Industrial, Agricultural, Marine, Forestry equipment, and simply for lubrication systems of various equipment.
~Phill c. C, Hydraulic technician, Hobart, Australia
As a grease transfer pump. In lube plant as a circulation pump. In palm kernel plant as a transfer pump.
~Engineering, Process/Production, Nnewi near Onitsha, Nigeria
Lube oil systems, flushing systems, transfer systems, forwarding systems, testings systems
~George K, Process Engineer, Cliffside park, NJ
Boost pumps on hydrostatic drives. Gearbox lub circuits. simple fixed displacement HPU's
~Stuart W, Engineer, Lanark, United Kingdom
Any thing from liquid gas to mollassis, emulsified liquids to light oils.
~Steve B, National Sales Manager, Melbourne, Australia
Hydraulic Power Units for agricultural and off-shore applications.
~Raymond A, Project Manager, Dordrecht, Netherlands
Chemical transfer, bitumen, crude oil, paraffine, ink, chocolate
~Massimo S, General Management, Charlotte, Italy
Surfactant paste, sulfonic acid, caustic lye, organic alkylates
~Engineering, Process/Production, Mumbai, India
Pumping oil to parts using a curve related to speed.
~Engineering, Design, Perth, Australia
Using on gearboxes for forced lubrication purposes
~Engineering, Design, Mysore, India
Handling Epoxy Resins, Viscosity Range 50-15000 cp
~Delmiro A, Design Engineer, Guaruja, Brazil
Higher viscosity, low flow moderate pressures
~Engineering, Consulting, 2030 Antwerpen, Belgium
Molasses, petrochemicals, gas, fat, grease
~Pedro Calisto, Marketing/Sales, Alverca, Portugal
Pumping slurry and viscous suspensions
~Engineering, Consulting, Maracaibo Venezuela, Venezuela
Slurry waste with some abrsive solids
~Marketing/Sales, Genova, Italy
Oils and viscose fluids
~Engineering, Design, Conshohocken, PA
FUEL DISPENSER PUMPS
~STERGIOS ZARIFIDIS, General Management, Athens, GREECE
Lube oil system;
~Engineering, Process/Production, Ploiesti, Romania
Chemical and oil
~Cesar Calao, Engineer, Barranquilla, Colombia
Repairing
~Engineering, Process/Production, JODHPUR, India
Hyd.
~Technical Support/Services, Chandler, AZ

Q:
Please share with us any “non-standard” applications that gear pumps have been used for.
10 answers
Answers:
Regen braking of conveyor systems and drive source for pump to drive belt cleaner system, self contained closed unit. Many more apps in the using of excess power to drive pumps.
~Pat K, Owner, Hydraulic repair company/ EX USAF, Orangeville, Columbia
I think that every application that I have supplied a pump for the pump was suitable, I'm not sure what you would construe as non standard.
~Steve B, National Sales Manager, Melbourne, Australia
See answer 2. Our Coriolis instruments dose with the help of gear pumps, the accuracy comes from our instruments.
~Ron T, Technical sales engineer Coriolis, Ruurlo, The Netherlands
Varisco V6 used in Sopac, a Portuguese company in Setubal, are in a non-standard application.
~Pedro Calisto, Marketing/Sales, Alverca, Portugal
Bi Directional pumps used in mining equipment, supply and deliveries are rectified.
~Stuart W, Engineer, Lanark, United Kingdom
Pumping oil and fluids with a pH of 4 to 9.5
~Engineering, Design, Perth, Australia
Pump very cold liquids.
~Franklin H, Pump Product Manager, Zionsville, IN
Shearing plant drive.
~Phill c. C, Hydraulic technician, Hobart, Australia
Coal crusher systems
~George K, Process Engineer, Cliffside park, NJ
Mink food
~Massimo S, General Management, Charlotte, Italy

Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of gear pumps?
8 answers
Answers:
Dead end system that had to small of a relief valve to handle system out put, resulted in major drive shaft failure, major damage to surrounding equipment
~Pat K, Owner, Hydraulic repair company/ EX USAF, Orangeville, Columbia
One of my costumers let the pumps work without any product inside and the pump, that was new, got destroyed.
~Pedro Calisto, Marketing/Sales, Alverca, Portugal
Yes, suction condition issue not exactly disastrous just a head ache until we put a larger suction line in.
~Steve B, National Sales Manager, Melbourne, Australia
Contamination errors, other system components faulty.
~Phill c. C, Hydraulic technician, Hobart, Australia
YES! Gear pumps should be used on clean liquids.
~Franklin H, Pump Product Manager, Zionsville, IN
Small centifical compressure failures
~George K, Process Engineer, Cliffside park, NJ
Use good filtration
~Stuart W, Engineer, Lanark, United Kingdom
Not really
~Massimo S, General Management, Charlotte, Italy

FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
11 answers
Answers:
Go over classic material construction and use technology which provides perfect tolerance and no need to use a lot of complicated and expensive metallurgy.
~Massimo S, General Management, Charlotte, Italy
Different housing, Mixed metal housings, IE steel inserts lighter support housing
~Pat K, Owner, Hydraulic repair company/ EX USAF, Orangeville, Columbia
Miniature gear pump able to deliver from 50ml to 2000ml per minute
~Engineering, Design, Perth, Australia
Needle roller bearings to improve service capabilities
~Stuart W, Engineer, Lanark, United Kingdom
This is old technology with the same old applications.
~Franklin H, Pump Product Manager, Zionsville, IN
Seal system capable of dry running for periods.
~Steve B, National Sales Manager, Melbourne, Australia
Multi-application applications
~George K, Process Engineer, Cliffside park, NJ
Low noise, high efficiency
~Raymond A, Project Manager, Dordrecht, Netherlands
Built in overload relief.
~Phill c. C, Hydraulic technician, Hobart, Australia
Stainless steel body
~Pedro Calisto, Marketing/Sales, Alverca, Portugal
Weight
~STERGIOS ZARIFIDIS, General Management, Athens, GREECE

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using gear pumps?
12 answers
Answers:
Try to match pump and motor systems as close to displacement as possible. Always keep in mind to be sure of your fluid supply to the pumps, very important in spool down conditions such as mower systems! Size your system holding tank to allow for air fluid separation when ever possible. Do not return fluid near suction source whenever possible.
~Pat K, Owner, Hydraulic repair company/ EX USAF, Orangeville, Columbia
Use them with our Coriolis instruments for real accuracy, low maintenance, high measuring span (up to 1000 : 1) and user a friendly solution. (also alarm available to avoid dry running)
~Ron T, Technical sales engineer Coriolis, Ruurlo, The Netherlands
Make sure that the materials correct for the application, this includes seals, or if jackets are required, and to ensure that the information given to the selector is accurate.
~Steve B, National Sales Manager, Melbourne, Australia
Internal Materials, like Bearings Materials, in front of Handled Liquid. If the pump will operate under Variable Velocity, Electrical Motor must be designed for this.
~Delmiro A, Design Engineer, Guaruja, Brazil
Buy a good quality pump that matches your application and it should last 50 years. Do not buy Stainless steel when cast iron will do the job.
~Franklin H, Pump Product Manager, Zionsville, IN
Don't look at price alone. High efficiency and low noise will make your customer happy during it's entire service life, low price only once.
~Raymond A, Project Manager, Dordrecht, Netherlands
Watch the discharge pressure, limit to about 300 psi
~George K, Process Engineer, Cliffside park, NJ
Buy pumps, today, that go slow, as slow as possible
~Massimo S, General Management, Charlotte, Italy
Study the application requirements.
~Phill c. C, Hydraulic technician, Hobart, Australia
Always apply by-pass on discharge
~Pedro Calisto, Marketing/Sales, Alverca, Portugal
Watch out for the dirt
~Stuart W, Engineer, Lanark, United Kingdom
Less noise
~STERGIOS ZARIFIDIS, General Management, Athens, GREECE

Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of gear pumps?
13 answers
Answers:
Design the right Protection Device considering Maximum Allowable Pressure at System. Normally, a single Pressure Relief Valve from Discharge to the Origin Tank. Temperature x Viscosity at Design, to avoid wrong needed BHP.
~Delmiro A, Design Engineer, Guaruja, Brazil
Make sure that to inform pump suppliers if a liquid that you intend to use reacts violently with water since they usually test with water and remains stay in the pump. Avoid dry-running.
~Ron T, Technical sales engineer Coriolis, Ruurlo, The Netherlands
Keep as much space between pump suction line and return line as possible, to give the oil enough time to cool and out-gas and contaminants to settle.
~Raymond A, Project Manager, Dordrecht, Netherlands
Always check viscosity and temperature, the pump must not work empty (ever), there must be no solids in the product.
~Pedro Calisto, Marketing/Sales, Alverca, Portugal
Accurate information not given. i.e. Viscosity, s.g. set up desired, suction condition etc etc.
~Steve B, National Sales Manager, Melbourne, Australia
Be aware of your system pressures and temps and housing materials, and fluid types.
~Pat K, Owner, Hydraulic repair company/ EX USAF, Orangeville, Columbia
High temperature, high pressure, lack of flooded suction conditions
~George K, Process Engineer, Cliffside park, NJ
Put a strainer or filter in the system to keep out large particles.
~Franklin H, Pump Product Manager, Zionsville, IN
Don't buy internal gears running fast, it wears fast too
~Massimo S, General Management, Charlotte, Italy
System Maintenance. check system settings are correct.
~Phill c. C, Hydraulic technician, Hobart, Australia
Checkong tolerances in maintenance.
~Cesar Calao, Engineer, Barranquilla, Colombia
THE RIGHT SELECTION OF PUMP
~STERGIOS ZARIFIDIS, General Management, Athens, GREECE
Choose good filtration
~Stuart W, Engineer, Lanark, United Kingdom


Related eNewsletters
See More

Also on GlobalSpec...
  • Receive email updates on new products and suppliers of interest to you
  • Online, interactive conferences / trade shows featuring latest news and industry trends
  • CR4
    Q&A and discussion for the engineering, scientific, and technical community
  • Engineering and scientific news from hundreds of sources
  • Industrial manufacturers and distributors