All facetype mechanical seals consist of a primary seal. Mechanical seal technology and selection eagleburgmann. Sealing systems for pumpssealing systems for pumps part i. Flygt npump series selfcleaning pumps with sustained high efficiency. The membrane is mechanically pushed and pulled in and out of a pumping chamber. The first type is a float type sensor, where a sealed float with an internal switch is mounted inside the seal chamber of the pump. The advantages of sealing pumps with dual pressurised dry gas seals are becoming widely recognized throughout industry. Seals types 2 hydraulic sealsrod seal and piston seal.
Wipe seal faces clean and apply a clean oil film prior to complete the equipment assembly. A pump is a device that moves fluids liquids or gases, or sometimes slurries, by mechanical action. The difference between single and double mechanical seals. The rotating mating ring features micromachined spiral grooves that compress an inert barrier gas and create a lifting force on the primary seal faces. One must identify the application data or operating conditions to properly select the type of seal and materials of construction to ensure maximum performance from the seal over its lifetime. Common sealing orientation and directions for hydraulic seals and pneumatic seals include internal or rod seal, external or piston seal, symmetric seal, and axial seal.
Sarbs pump maintenance seminar, june 7, 2012 seal typesseal types causes of seal failure piping plans sealinggg water usage safeunit flowmeters. If you want to get more pump mechanical seal selection tips, ive got something special for you. Because pumps are generally considered to be more expensive than the. The chapter describes mechanical shaft seals used in grundfos pumps as examples of the variety of shaft seal solutions for different applications. This style seal has been engineered to be inexpensive to manufacture and to be durable in service.
This seal design was amount the first single spring seals and proceeded the slightly less expensive type 21 seals. Installation instructions type 6 shaft seal the seal assembly consists of these components. Since our subject is dealing with pumps, lets first explore a basic. Bulletin number twentynine selecting mechanical seals. In light of the increasing emphasis on decreasing leakage of pollutants in the industrial setting, there is a need to become informed about sealing equipment under our control. Mechanical seals, seal supply systems, magnetic couplings, carbon floating ring seals, expansion joints, gaskets and packings as well as comprehensive services. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Plan 01 is recommended to be used for clean pumped products, since dirty products can clod the internal line. An endface mechanical seal, or a mechanical endface seal, also referred to as a mechanical face seal but usually simply as a mechanical seal, is a type of seal utilised in rotating equipment, such as pumps, mixers, blowers, and compressors.
A definition is better given after the functions of a seal are described. The end cap may take a little bit of pulling to separate from the pump. In this type of seal often there are no metallic parts in contact with the product or, if. Mechanical seals standard oem mechanical seals uk seals. Mar 18, 2015 all the seal assembly drawing gives the seal setting dimensions from the face of the stuffing box to the back of the rotary assembly. Aesseal has developed a range of pump dry gas seals to suit every application. Mechanical seals for product pipeline pumps application guide introduction this guide will address the application of mechanical seals in product pipeline pumps, covering the transmission of crude oil and refined products such as fuel oils, gasolines and natural gas liquids ngl, for example propane and ethane. Get free product recommendations and mechanical seal reliability advice. Pump manufacturer pump type manufacturers number hts part number americana 395005 201 americana ii 397012. This gives rise to the alternative name radial face seal, pump seals or packings. Sealing options though often overlooked, shaft sealing selection can be just as critical as pump selection. The seal is pressfit into a housing bore with the sealing lip contacting the shaft. In plan 11, product is routed from the pump discharge to the seal chamber to provide cooling for the seal and to vent air or.
Hydraulic piston seals piston seals or piston rings are used in hydraulic cylinders for fluid sealing. Mechanical seals technical manual brenner industrial sales. Mechanical shaft seal types and sealing systems grundfos. The complete cross reference for mechanical face seal replacement. The mechanical seal stationary seat will slide from. The name of the diaphragm pump is derived from the rubber membrane that the pump uses to achieve its pumping action. There are various types and arrangement of the mechanical seals being used for the centrifugal pumps. Be especially careful of the lapped sealing surface of the rotary washer and stationary seat. Pumps can be classified into three major groups according to the method they use to move the fluid. This fluid lubricates the seal faces and absorbs the heat generated from the associated friction, which crosses the seal faces as a liquid and vaporizes into the atmosphere.
The optimum life of a seal is the period between major overhauls of the pump unit. Common types of pumps mechanical seal piping plans single. Due to the uncontrollable metal costs, all prices and delivery times are subject to change on a daily basis. A wide variety of pump seal types options are available to you, such as beverage. Probably the most widely recognized and also most common. Mechanical seals for product pipeline pumps application guide introduction this guide will address the application of mechanical seals in product pipeline pumps, covering the transmission of crude oil and refined products such as fuel oils, gasolines and natural. Sarbs pump maintenance seminar, june 7, 2012 seal typesseal types causes of seal failure piping plans. The diaphragm works on an air displacement principle. There are two primary types of seal fail detection methods used throughout the pump industry the float type sensor and the probe type sensor, each with distinctive advantages and some disadvantages. The seal housing has a seal flush pipe connection that is oriented in the motor adaptor. Hydraulic seals and pneumatic seals selection guide. With more than 300 bowl and impeller designs, the vtp provides unsurpassed hydraulic coverage to ensure the best pump selection for a wide variety of services. About us at the leading edge of industrial sealing technology.
This seal is a precision product and should be handled accordingly. Mechanical seals are one of the most effective ways of sealing rotating shafts, consisting of two lapped faces arranged perpendicular to the axis of the rotating shaft. The active seal system is a patented zeroleakage doubleseal system that actively prevents liquid from entering the motor cavity, thereby reducing the risk for bearing and stator failure. Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps understand the working principle of the tuthill. Mechanical shaft seal types and sealing systems 26 1. A rotary seal head with spring b stationary seat caution. See inside cover for material code, head and mating ring types demand quality. Mechanical seals can operate for many years without issue, as long as theyve been properly selected for their application. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. Shaft seals can take many different forms, but all serve the common purpose of keeping the liquid in the pump.
It comprises a unique inner seal that acts as a micropump and an outer seal that prevents leakage of pumped media into the buffer chamber. Sealing systems for pumpssealing systems for pumps part ii presented by. The purpose of such a system is to actuate a hydraulic cylinder also known as a hydraulic motor using pressurized hydraulic fluid. Different types of mechanical seal pump heat transfer scribd. Shelby scottshelby scott western region john crane incjohn crane, inc. Due to the uncontrollable metal costs, all prices and delivery times are subject to change on a. Mechanical shaft seal types in this chapter, the basic working principles for single mechanical shaft seals will be put into a practical context. Pump sealing this section covers the shaft sealing devices used on alfa laval centrifugal, liquid ring and rotary lobe pumps. Dec 01, 2015 silica carbide vs tungsten carbide seals. A typical plant will use some or perhaps all of the following five types of pump seals. Here are the most commonly used shaft seal options for pumps.
Different types of pumps mechanical seal piping plans are detailed in api 682 or iso 21049 standards pump seal piping plans for single seals. The mechanical seal shown in the pump photograph is a type. So, its common practice to use a single mechanical seal if the pumped product poses little to no risk to the environment. You can also choose from standard, nonstandard pump seal types, as well as from plastic, rubber, and metal pump seal types there are 1,936 suppliers who sells pump seal types on, mainly located in asia. Hydraulic filters remove contaminants from oils, emulsions, and other hydraulic fluids. Available with a wide range of seal faces including. As mechanical seals can be used to seal a myriad of different products on an equally vast array of equipment, we will be primarily focusing on the use of mechanical seals on rotating shaft pumps. Feb 25, 2016 hydraulic seals are available in so many types. Uk seals has a very extensive range of mechanical seals, all seal types in all sizes and materials. Plan 11 is the default seal flush plan for all single seals. Sarbs pump maintenance seminar, june 7, 2012 pump types submersible pump sewage pump. Some common types of pump seals michael smith engineers. The diagram shows a multistage centrifugal pump with clockwise rotation looking from the drive side, a type.
Hydraulic rod seals rod seals are used in hydraulic cylinders for fluid sealing. John crane type 2800e noncontacting seals offer maximum reliability and uptime. Dec 29, 2014 mechanical seals can operate for many years without issue, as long as theyve been properly selected for their application. Internal circulation from the pressure side to the seal chamber can also be integrated in the pump design with the same result. Frictional heat generation and wear is controlled by maintaining a film of lubricant between the seal faces. Common types of pumps mechanical seal piping plans. Sep 17, 2014 a mechanical seal consists of 2 principle components. When sealing a centrifugal pump, its essential to allow a rotating shaft to enter. Its a free checklist and bonus will show you the detail selection recommendations for various product categories. Sealing systems for pumpssealing systems for pumps part i presented by.
Remove the 8 316 allen bolts that hold the pump cavity end cap in place. Our product portfolio includes everything from mechanical seals and seal supply systems to magnetic couplings, carbon floating ring. Items to be returned must be approved by power plus international, and may be subjected to a restocking fee. Most common types of pump seal piping plans for single seals are discussed in following paragraphs. This articles describes some of the commonly used mechanical seal types like cartridge type mechanical seals, balanced type, unbalanced type, conventional, pusher, and nonpusher type of mechanical seals. Pumps operate by some mechanism typically reciprocating or rotary, and consume energy to perform mechanical work moving the fluid. Shaft or sleeve should be oiled lightly prior to seal assembly to allow the move freely over it. In addition to shaft seals, other proprietary seals not detailed in this section, such as o rings and lip seals can be found on the pumphead and gearcase. The shaft seal is a sealing element which seals the rotating shaft of a centrifugal pump where it passes through the nonrotating pump casing, reducing fluidleakage to atmosphere or the entry of air from outside to a certain level, and keeps wear of the sealing faces as low as possible. Different types of mechanical seal free download as pdf file. A liptype mechanical seal may only require static secondary seals because the deflection of the liptype seal accommodates equipment operating motion.
Seal ring packing ss316, alloy20, hastalloy, monel carbon, tungsten carbide, silicon carbide epr, viton, fep, neoprene, ptfe, kalrez rubber bellow seals type. The bottom 4 allen bolts also hold the pump mounting bracket. It comprises a unique inner seal that acts as a micropump and an outer seal that prevents leakage of pumped. A single cartridgemounted balanced seal, a dual cartridgemounted balanced seal, a balanced outside seal for low pressure applications, a balanced seal installed inside the stuffing box, and. One component is stationary and the other rotates against it to achieve a seal figure 2. One face is fixed to the equipment casing or vessel, while the other is fixed to the shaft and so rotates. Sealing systems for pumps sealing systems for pumps.
Click on the box below to download the free pdf checklist. Avoid making flat spots or reducing shaft diameter. As such, mechanical seals resemble thrust bearings. A mechanical seal consists of 2 principle components. This is an internal recirculation from the pump discharge into the seal chamber. Bulletin number twentynine selecting mechanical seals what is a mechanical seal. The materials of seal construction, particularly the sealing faces and elastomers. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the.
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