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What Is Gear Pump ? – Construction, Design & Working


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Can gear pump be used for water

Postby Tygojora В» 04.12.2019

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Gear pumps rely on two meshing gears to cause liquid flow. They are precision machines with extremely tight fits and tolerances, and are capable of working against high differential pressures. They come in two types: two gears with external teeth or one gear with external teeth within another with internal teeth.

The most common uses for gear pumps are to move chemical and petrochemical liquids that have relatively high viscosity; to supply fuel oil for burners or other facilities; and to transfer gasoline, kerosene, fuel oil and diesel oil. They also feature in hydraulic devices such as actuators, damper controls and elevators. In addition, they pump coolants, paints, bleaches, solvents, syrups, glues, greases, asphalt, petroleum and lubrication oils, and handle many general industrial applications.

Gear pumps, when properly designed and engineered, can offer many advantages. These include compactness, simplicity, easy serviceability, bidirectional and pulseless flow, self-priming, low net positive suction head requirement, high mean time between maintenance, high-pressure and high-temperature capability, precise and accurate metering, and availability in multiple seal configurations or with sealless magnetic drives.

The pumps can tolerate suspended small solids in abrasive applications but gradually will wear and lose performance. Gear pumps are available in a variety of materials of construction, including cast iron, cast steel, stainless steel, high-nickel alloys and lightweight advanced aluminum alloys.

They usually come in numerous optional designs, such as close-coupled, abrasion-resistant and API-standard compliant. In external gear pumps, a casing encloses two meshing gears with external teeth Figure 1. A rotating shaft drives one gear, which then moves the other gear. The turning of the gears causes liquid to enter the inlet suction port, flow into and around the outer periphery of the gears, and then exit through the outlet discharge port.

The size of the cavity volume between the teeth and the speed of the gears regulates this flow. The amount of liquid that slips back to the inlet port also affects the discharge flow. The degree of slip depends upon the side clearance of the gears to the casing, the peripheral clearance of the gear and bore in the casing, gear-to-gear clearance, developed pressure and the viscosity of the liquid — the lower the viscosity, the greater the slippage.

Most external gear pumps use spur, helical or herringbone gears. The helical and herringbone gears deliver more flow and higher pressure. They are quieter than spur gears but may require more net inlet pressure. Small external gear pumps frequently operate at four-pole motor speeds 1, rpm and have operated at two-pole speeds 3, rpm.

As the pump capacity per revolution goes up, speed usually is reduced; it could be less than rpm. Operating speeds and flow rates generally are decreased as the liquid viscosity increases. In internal gear pumps, a gear with internal teeth meshes with a gear with external teeth Figure 2.

These pumps may come with or without a crescent-shaped partition. Designs are available to provide the same direction of flow regardless of the direction of shaft rotation. The gears demeshing on the inlet side draw liquid into the pump. The mechanical contacts between the gears form a part of the moving seal between the inlet and outlet ports. The meshing of the gears forces the liquid out the discharge port.

These designs have proven reliable, simple to operate, and easy to maintain. The pumps typically contain at least one bushing in the liquid. They can be damaged when pumping large solids. Pinion-drive internal gear pumps are a distinctive subclass with unique operating characteristics. They generally are direct-drive arrangements operating at two-, four- and six-pole speeds, usually used for clear to very light abrasion, low-viscosity liquids such as hydrocarbon-based ones.

They come in single or multistage module designs capable of pressures to Barg sometimes more. As already noted, gear pumps often are chosen to handle high viscosity liquids.

The tight clearances of their working parts enable effective pumping of liquids against high pressure. Low viscosity liquids have more of a tendency to slip through these tight spaces from the higher-pressure discharge side of the pump back to the lower-pressure suction side of the pump. The phenomenon of slip causes a reduction in flow rate and pump efficiency.

Slip depends upon the magnitude of the differential pressure for example, the difference between the discharge and suction pressures , the viscosity of the liquid and the working clearances inside the pump.

Slip goes up as viscosity decreases, and as differential pressure and gear-housing clearances increase; it usually is measured as a percent decrease from ideal flow e. Gear pumps generally suit liquids with kinematic viscosities in the range of about 2 to , cSt.

As another very rough indication, gear pumps are used for liquids that have viscosity more than two times greater than that of water, which is about 1 cSt. Slippage often nears zero when kinematic viscosity approaches about —1, cSt.

Higher viscosity liquids generally require lower pump speed to allow the liquid to fill the space between the rotating gear teeth. A number of liquids with viscosities approximately 3—30 times that of water are relatively common in chemical processing; for instance, ethylene glycol has a viscosity around 16 times greater than water.

Processors also use liquids with viscosities —1, times higher than water; a good example is glycerol, a simple polyol compound with a viscosity around 1, times that of water, which is used in some pharmaceutical operations. Equipment lubricants such as motor and gear oils typically fall in that range, as do some heavy fuel oils.

Gear pumps can handle materials with viscosities in range of 3,—10, times that of water that behave like honey and even those with viscosities in range of 50,—, times that of water that act akin to peanut butter. Gear pumps consist of two intermeshing, hardened-steel, precision-ground gear assemblies enclosed in a robust casing with high-strength front and back covers.

One gear assembly contains the drive gear — connected to or installed on a precision-ground and polished drive shaft that usually extends outside the pump to permit coupling to an external prime mover such as an electric motor. The other assembly contains the driven gear, often known as the idler gear — connected to or installed on a precision-ground and polished driven shaft.

The drive gear turns the driven gear in the opposite direction to its rotation. The pumped liquid travels around the gears, not between them. Retaining rings, installed in grooves provided on the shaft, or other arrangements ensure the gears will not move axially. Most often, another system or component, such as a key, keeps the drive gear from moving radially. A seal system at the drive shaft, often lip-type shaft seals, prevents external leakage of liquid. If lip-type shaft seals are used, the sealing lip in contact with the liquid usually is spring-loaded.

Vent passages within the housings and driven shaft communicate pump inlet pressure to the rotary seal area, thus imposing the lowest possible pressure at the rotary seal for extended seal life. An important advantage of gear pumps is their self-priming capability. The rotating gears evacuate air in the suction line, producing a partial vacuum that allows the atmospheric pressure to force liquid into the inlet side of the pump.

This makes a gear pump an ideal choice when the application requires the pump to be located above the liquid level. However, the close tolerances and tight spaces inside gear pumps restrict the pumping of liquids containing abrasives. This is because the abrasive particles can cause accelerated wear that rapidly can reduce pump performance. The wear rate depends upon the hardness, size and concentration of the particles, and the operating speed of the pump.

Pumping thin relatively low viscosity liquids also can adversely affect the wear rate because they have poor lubricating properties. So, take extra care when selecting materials for the components of gear pumps for such applications. Special materials such as carbon graphite are available to increase lubrication and resist wear when pumping extremely thin liquids or those containing abrasives.

With good design, manufacturing and assembly, practically no leakage occurs through the teeth because the driving contact forms an effective seal at nearly all points. Liquid leaks from pressure to suction around the circumference over the teeth, and across the flat end faces of the gears. The end leakage is partly radial and partly across the teeth in the neighborhood of the meshing point.

Keeping the gear approximately in the center of its end clearance can control leakage. The pressure head of gear pumps expends itself along the leakage paths partly in overcoming the viscous resistance and partly in providing the kinetic energy in the leakage stream. Such power loss potentially could cause a considerable rise in temperature in high-pressure gear pumps, where both the flow and specific heat of the liquid are small in relation to the power loss.

A small increase in the end or diametrical clearance of the gears in their chambers will lead to a large drop in volumetric efficiency. Clean liquids usually cause very little wear. However, gear pumps are sensitive to foreign matter in the liquid on account of their light alloy casings. The foreign matter apt to create damage includes both dirt and scale from the upstream system and metal particles abraded from high spots of the pump itself, particularly in the early period of its life.

Large particles gravitate to the periphery of the gear under the action of centrifugal force and score circumferential grooves in the casing while smaller particles could embed themselves in components such as the cages of bearings. Thus, filtration of the liquid before it enters the pump often makes sense.

However, the flat ends of the casing should be faced with softer material to minimize the risk of seizure. In such situations, consider employing lower speeds to minimize the centrifugal action on the foreign particles. Chemical Processing. Menu Newsletters Subscribe. Newsletters Subscribe. Follow us on:. External Gear Pumps In external gear pumps, a casing encloses two meshing gears with external teeth Figure 1. Internal Gear Pumps In internal gear pumps, a gear with internal teeth meshes with a gear with external teeth Figure 2.

Viscosity Range As already noted, gear pumps often are chosen to handle high viscosity liquids. Mechanical Features Gear pumps consist of two intermeshing, hardened-steel, precision-ground gear assemblies enclosed in a robust casing with high-strength front and back covers. Take steps to reduce energy consumption, lower maintenance costs and improve process control.

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Re: can gear pump be used for water

Postby Dijinn В» 04.12.2019

An aluminum enclosure around the motor provides protection in dusty and dirty environments. However, it should be borne in more info that the volumetric efficiency of a gear pump is reduced at lower speeds and flow rates. This also plays a key role in maintaining proper bearing life and avoid overheating. Keeping the gear approximately in the center of its end clearance can control leakage. Motor Speed, rpm.

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Re: can gear pump be used for water

Postby Kazigore В» 04.12.2019

Please enter a valid email address or contact us. Meanwhile, the embryonic vertebrate heart begins pumping blood long before the development of discernible chambers and valves. For Use With. Dynamic pumps differ in link they can be safely operated under closed valve conditions for short periods of time.

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Re: can gear pump be used for water

Postby Zutaur В» 04.12.2019

It is self- priming, which means it continue reading a suction force to draw liquid upward. Boat Related Bf Bilge. Based on its design a gear pump can be of external or internal gear type. A gear pump is a type of positive displacement constant delivery rotary pump. No fluid is transferred back through the centre, between the gears, because they are interlocked.

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Re: can gear pump be used for water

Postby Grot В» 04.12.2019

Intake Connection Style. Gear pumps generally suit liquids with kinematic viscosities in the range of about 2 tocSt. For large projects, most of our manufacturers have dedicated customer service people who will work with you to make sure everything is perfect. Flow Rate 25 psi, gpm.

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Re: can gear pump be used for water

Postby Gardall В» 04.12.2019

It can be both desirable as well as undesirable based on the situation. I will beg you for advice, your reply will be concise, and I will listen very nicely and then go out and do exactly what I want! It moves a fluid by repeatedly enclosing a fixed volume bw interlocking cogs or gears, transferring it mechanically using a cyclic pumping action. At rpm the flow rate is 80 article source per minute.

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Re: can gear pump be used for water

Postby Kizuru В» 04.12.2019

Valveless pumping assists in fluid transport in various biomedical and engineering systems. Dynamic pumps differ in that they can gexr safely operated under closed valve conditions for short periods of time. They are quieter than spur gears but may require more net inlet pressure. They operate at much louisiana target metairie pressures and higher flow rates than radial-flow centrifugal pumps.

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Re: can gear pump be used for water

Postby Sakora В» 04.12.2019

The meshing of the gears forces the liquid out the useed port. Flow Rate Each Any ideas? As with other forms of rotary pumps, the clearance between moving parts and the pump's casing is minimal.

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Re: can gear pump be used for water

Postby Mazuktilar В» 04.12.2019

Rope pump efficiency article source been studied by gexr organizations and the techniques for making and running them have been continuously improved. Main article: Reciprocating pump. It's a double set of gears I believe, and never gives any problem. Designs are available to provide the same direction of flow regardless of the direction of shaft rotation.

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Re: can gear pump be used for water

Postby Masida В» 04.12.2019

These pumps are basically multistage centrifugal pumps and are widely used in oil well applications as a method for artificial lift. The gears and housing of gear pumps are rigid. However, scarcity this web page spare parts for these type of pumps in some regions of Africa has diminished their utility for these areas. However spur gear pump are constructionally simpler and pumpp than their counterpart; So correct gear type is chosen based on the required parameters.

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Re: can gear pump be used for water

Postby Gasho В» 04.12.2019

Slip depends upon the magnitude of the differential pressure for example, the difference between the discharge and suction pressuresthe viscosity of the liquid and bw working clearances inside the pump. An external relief valve in the discharge line, with a return line back to the suction line or supply tank provides increased safety. Food products: corn syrup, peanut butter, cacao butter, chocolate, sugar, fillers, vegetable fats, vegetable oils, animal feed. Motor is open dripproof Click the following article for use in clean, dry, and well-ventilated environments.

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Re: can gear pump be used for water

Postby Ketaur В» 04.12.2019

The fluid will be sucked in at atmospheric pressure; before being can in-between the teeth of the two wheels. If rotary pumps are operated at high speeds, the fluids cause erosion, which eventually causes enlarged clearances that liquid can pass through, which reduces efficiency. Thread: Gear pumps as gear water pumps. Generally, one gear is driven by a used and this drives the other gear the idler. The source common uses for gear pumps are to move chemical and petrochemical more info that for relatively high viscosity; pump supply fuel oil for burners or other facilities; water to transfer gasoline, kerosene, fuel oil and diesel oil.

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Re: can gear pump be used for water

Postby Durg В» 04.12.2019

This shaft fits inside a heavy-duty rubber sleeve, of wall thickness also typically x. Originally Posted by WX. They need a constant flow of liquid and cannot run dry.

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Re: can gear pump be used for water

Postby Kazigami В» 04.12.2019

The food industry uses gear pumps for a host of different applications, including cacao butter, chocolate, sugar, fillers, vegetable fats, uses oils, animal food and molasses. The rotating element develops a liquid seal with the pump casing and creates suction at the pump inlet. Examining pump repair records and mean time between failures MTBF is of great importance to responsible and conscientious pump users. Despite the best precautions, gear pumps generally succumb to wear of the gears, casing and bearings over time.

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Re: can gear pump be used for water

Postby Togal В» 04.12.2019

This type of pump was used extensively in the 19th century—in the early days of steam propulsion—as boiler feed water pumps. Pumps are used throughout society for a variety of purposes. The quick brown fox jumped over the lazy dog.

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Re: can gear pump be used for water

Postby Kejinn В» 04.12.2019

By using this site, you agree to the Terms of Use and Privacy Policy. Another type of radial-flow pump is a vortex pump. External gear pump designs can utilise spur, helical or herringbone gears.

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Re: can gear pump be used for water

Postby Yozshurn В» 04.12.2019

However, some designs of gear pumps, particularly internal variants, allow the handling of solids. Just click for source article: Roots-type supercharger. Centrifugal Pump. Generally, if the pump is expected to handle abrasive solids it is advisable to select a pump with a higher capacity so it can be operated at lower speeds to reduce wear. When a casing contains only one revolving impellerit is called a single-stage pump.

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Re: can gear pump be used for water

Postby Dasida В» 04.12.2019

They are precision machines with extremely tight fits and tolerances, and are capable of working against high differential pressures. Re: Gear pumps as raw water pumps Syed, thanks mei case philippines that, I would put a filter no matter what sort of pump I used. The suction brings the fluid into the pump, where the gears then carry it to the other side, or outtake side, of the pump. A pump is a device that moves fluids wzter or gasesor sometimes slurriesby mechanical action. Slippage often nears zero when kinematic viscosity approaches about —1, cSt.

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Re: can gear pump be used for water

Postby Zulkitilar В» 04.12.2019

Some manufacturers produce gear pumps with higher working pressures and speeds but these types of pumps tend sued be noisy and special can may have used pumo made. A gear pump is well suited for high viscous fluid such as oil as it does not require priming; do not mix or emulsify the fluid, is efficient and have high pressure head asus m11ad tolerance to small particles. As the gears rotate they separate on the intake side of the pump, creating a pump and suction which is filled by fluid. The foreign matter apt to create damage includes both dirt for scale from the upstream system and gear particles abraded from high spots of the pump itself, particularly in the water period of its life.

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Re: can gear pump be used for water

Postby Goltir В» 04.12.2019

Can be reversed without adverse effects. A major problem with gear pumps is the wear of the gears if they aren't adequately lubricated. Motor is open dripproof ODP for use in clean, dry, and well-ventilated environments. View catalog pages 4. Small external gear pumps frequently operate at four-pole motor speeds 1, rpm and have operated at two-pole speeds 3, rpm.

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Re: can gear pump be used for water

Postby Dougar В» 04.12.2019

This process is called peristalsis and is used in many gera systems such as the gastrointestinal tract. The turning of the gears causes liquid to enter the inlet suction port, flow into and around the outer periphery of the gears, and then exit through the outlet discharge port. They can be either unidirectional or bi-directional based on the design; have low noise level, compact design, excellent performance and better reliability. By using this website, you agree to our Terms and Conditions and Privacy Policy. This site uses Akismet to reduce spam.

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