Gear pumps belong to the group of positive displacement pumps which are characterized with fixed volume discharge per unit revolution of the pump. Australian pump industry association australian pump. Pump maintenance michigan water environment association. The theoretical flow ripple of an external gear pump.
This senior project discusses the design, construction, and evaluation of a hydraulic powered pto winch installed on a 1952 dodge m37 cargo truck. This handbook is also available for download from our website. The pump size must conform to the flow rate, pressure, speed, suction conditons etc. Centrifugal pumps vary in design and construction from simple pumps with relatively few parts. These include compactness, simplicity of design, easy serviceability, bi directional. Usually, these pumps are designed to work over a wide range of speeds and high delivery pressures as positive displacement units in hydraulic. Read this manual carefully to learn how to safely install, op erate and repair your pump. Slurry pumps therefore need much wider and heavier impellers to. Pump housing and gears are made of top quality bronze, shafts are from stainless. Liquid at discharge line shall be accelerated from low velocity to higher velocity. Accessory equipment must be used to evacuate entrained air within the pump, such as an eductor, a hand primer, etc.
The force on the piston during the upstroke is equal to the weight of the water column above it, or the product of piston area ap and the static head h. Training basic hydraulics parker truck hydraulics center. The knowhow and technology necessary to design and operate pumping systems in an energyefficient way are well established and widely. Gears permco pumps are cut in our own plant to extremely close tolerances. General gear pumps and gear motors technical information general information sauerdanfoss offers a wide range of gear products to meet most application needs. The catalogue highlights the range of aluminum and cast iron gear pumps and motors available from sauerdanfoss. Are you an engineer or technician working with design and installation of pumps and pump systems. General gear pumps and gear motors technical information. Gea tuchenhagen has set up this manual for giving support in finding out the optimal pump design.
In other gear type hydraulic pumps, pressure at the outlet side pushes. Eaton ternal ear pump d series pcc01 december 14 7 model code double pump the following 29digit coding system has been developed to identify standard configuration options for the external double gear pump. The handbook includes all the necessary information for the correct selection and successful application of the alfa laval ranges of centrifugal, liquid ring and rotary lobe pumps. Gear pumps are designed and fitted with very close internal clearances.
Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps. Back to basics a characteristic resistance coefficient, or value, which k can be found in perrys handbook 1 and other sources table 1 2. This system replaces the factory mechanical drive system with a complete hydraulic system capable of producing the original line pull. Index introduction page 1 chapteri,relationbetweenperipheralvelocity andhead 2 chapterii,design pdf format. Alfa laval pump handbook and pump parts all you need to know. First of all, we would like to thank john goff and tony whelan who have contributed new material that has been included in this new addition of their original book. The handbook is for those who work and are associated with the pump industry such as manufacturers, distributors, educators, designers, operators and users. Alfa laval pump handbook 1 inside view this pump handbook has been produced to support pump users at all levels, providing an invaluable reference tool. Hopefully the following summary of my notes helps anyone looking for information on gear pumps. The pump type chosen must correspond to product viscosity, product density, temperature, system pressure, material of the pump, shearing tendency of the product etc.
The handbook also contains more sophisticated technical information, like ph tables and graphs that show friction losses in pipes and hoses. In addition, we would like to thank john herrmann, jim reilly, and joan decoste of the dynisco companies and christine ronaghan and. The simplicity of the gear pump design translates into higher reliability as compared to other positive displacement pumps that use a more complex design. Pump industry australias pump technical handbook has been has been specially designed for the australian pump industry. Special attention was given to produce a manual that is interesting and informative for everybody, from the competent engineer to the layman. The simplest form of this type of rotary pump is the gerotor pump.
Reciprocating pump has uncontinous flow to deliver the liquid. Typically, gear pumps have efficiencies around 85%. As is well known, external gear pumps are widely used in the fluid power. In order for these bearings to work, a minimum speed is required depends upon pressure of the pump. From pump types and components, to precautions for viscous liquids, to life cycle costs, you will find answers to your technical questions about pumps in our pump handbook.
Indicated are the piston displacement and rising main and pump dimensions. Gear pumps are the most popular type of positive displacement pump. Properly selected, a gear pump will be more reliable and less maintenance intensive handle solvents, hot liquids and many chemicals that cannot be handled with. Inline pumps are constructed to be mounted on a straight pipe hence the name inline. These pumps are often used for smallvolume capacity applications where space is quite limited 4. Advances in pump design, motor performance, control systems, power electronics and monitoring equipment have made it possible for most pumping applications to run at the leading edge. Design of chemical pumps and manufacturing techniques used in nonmetallic pump applications are included in book. To prevent leakage caused by the common crowning effect, permco shapes gears rather than hobbing and shaving them. A pump unit consists of a pump and any other associated equipment that is defined as being included in an assembly. They deal mainly with piping issues that affect pump performance. Pump design figure 6 singleacting piston pump directly coupled to a wind rotor.
Select from a number of titles covering a multitude of various topics such as optimizing pumping systems, mechanical seals, wastewater treatment plant pumps, reliability of pumping equipment, variable frequency drives, power plant pumps, and pump life cycle costs. Design analysis and testing of a gear pump semantic scholar. Centrifugal and positive displacement pumps cedengineering. Depending on the design and service, gear type pumps may be furnished either with or without timing gears.
Gear pumps use toothed gears turning inside a close tolerance housing to drawin liquid and then squeezing it out ahead of them. The second type of pump is the positive displacement design, the most common of which is the diaphragm type. Gear pump manual original instructions albany pumps. Selecting the right pump to serve the purpose is not always that easy and requires special knowledge. August 2011 synopsis the following is a list of potential problems areas or simply just good design practice that the author has applied and encountered over the years. This process will effect in pressure loss, where reciprocating pump has higher pressure loss compared with continuous flow in each circle of crankshaft rotation, see figure 12. On construction jobs there is a need for a pump which has the ability to prime itself repeatedly, since the purpose of the pump is to keep the hole dry. Longestablished as the leading guide to pump design and application, the pump handbook has been fully revised and updated with the latest developments in pump technology.
Guidelines for pump system designers jacques chaurette p. Usually one of the gears is capable of driving the others. Detailed specifications are included for all products. Common rental pumps include standard, trash and submersible models. It is easy to understand with a basic knowledge of physics. Centrifugal pump design is the most typical for fire pumps and auxiliary pumps in modern fire. Many external gear pumps use journal bearings to support the rotating shafts. Gear pumps are often used in pumping relatively viscous liquids, such as some viscous liquid hydrocarbons, liquid fuels, lubrication oil pumping in machinery packages, hydraulic units and fluid power transfer units. Failure to do so could result in personal injury or damage to the pump. This manual is designed to help you achieve the best performance and longest life from your gorman. Troubleshooting guide troubleshooting guide part 1 problem possible cause corrective action no discharge pump not primed verify suction pipe is submerged. Suitable for application pump speeds up toapi674 1995andhydraulicinstitutespeedlimitations.
Consulting engineer, formerly manager, pump design, westinghouse. The gear pump is a precision machine with extremely tight fits and tolerances, and is capable of working against high differential pressures. Small gear pumps usually operate at a speed between 1,700 rpm and 4,500 rpm, and larger models most often. A pump is a single piece of equipment that terminates at its suction and discharge connections and its shaft end. Each shaft revolution displaces a definite amount of liquid relatively unaffected by the back pressure in the. The working principle of the external gear pump is illustrated in figure 1. Gear pump features pressureloaded design efficient, simple design few moving parts exceptionally compact and lightweight for their capacity efficient at high pressure operation resistant to cavitation effects ance to system contamination high toler le under cold weather operation reliab. The manner in which fluid flows through the pump is determined by the design of the pump casing and the impeller.
Whenever the term pump unit is applied, it must be defined to show the content intended. Gear pumps are rotary pumps in which two or more gears mesh to provide the pumping action. The background of a gear pumps the background of gear pump. The largest warman slurry pump, for example, can pump particles up to 530mm in spherical size. The three types of flow through a centrifugal pump are radial flow, axial flow, and mixed flow.
A basic gear pump will have a rotary housing containing two or more gears toothed wheels, helical gears or lobed cams. In a radial flow pump, the liquid enters at the center of the impeller and is directed out. This type uses a rotating impeller to draw water into the pump and pressurize the discharge flow. As a manufacturer and supplier of centrifugal pumps and positive displacement pumps we. Though gear pumps enjoy a high level of reliability and offer a low purchase cost to. These units were developed by permco to serve the industrial and mobile. L is length of pipe feet d is diameter of pipe square feet v is mean velocity fps c h is hazenwilliams friction coefficient. These include compactness, simplicity of design, easy serviceability, bidirectional. The four most common types of inlets are inline, endsuction, doublesuction and inlet for submersible pumps, see figure 1. Gear pumps properly designed and engineered can offer many advantages. This pump handbook has been produced to support pump users at all levels, providing an invaluable reference tool. This catalog contains the information needed to apply and specify a permco pump or motor for your hydraulic system.
A drive gear that is driven by a motor rotates an idler gear in the opposite direction. All 29 digits of the code must be present to release a new product number. Packed with 1,150 detailed illustrations and written by a team of over 100 internationally renowned. Feb 2000 the centrifugal slurry pump must be designed to allow the passage of abrasive particles which can at time be extremely large.