The variant code of mechanical shaft seals is stamped on the pump nameplate. The speed of the shaft and the materials of construction of the mechanical seal are of even greater importance than a flushedlubricated seal. A few basic components and principles in mechanical seal design contribute to a working seal at the interface of the rotating shaft and stationary pumpmixersealchamber housing. The type 21 is ideal for use in centrifugal, rotary and turbine pumps, compressors, chillers and other rotary shaft equipment. European standard en 12756 defines the principal dimensions for the installation of single and multiple mechanical shaft seals into pump housings. Stationary face the mating ring against which the seal face runs. One face is fixed to the equipment casing or vessel, while the other is fixed to the shaft and so. This prevents the liquid from leaking through the clearance between the pump body and the shaft. Type 21 elastomer bellows seals john crane mechanical. American seal and packing delivers a full range of seals split, metal bellows, cartridge, single spring, configurations and component materials seals fluid moved by any equipment.
Mechanical shaft seal tamar tech mechanical sealling. Mechanical shaft seals seal pumps designed for oem or mechancial seal conversions from braided pump packing. Mechanical seal applications mechanical seals the shaft seals used in rotating machinery such as pumps, hydraulic turbines, agitators and centrifuges play an important role in maintaining the safety and economic efficiency of machinery. Our generalpurpose type 21 mechanical seal has become the industry standard for oem designers.
The shaft seal is exposed to widely varying operating conditions. The mechanical seal mechanical seals have the purpose of preventing leakage of a fluid liquid or gaseous through the clearance between a shaft and the fluid container. Nippon pillar has provided various types of mechanical seals with secure high gastightness since 1951 when the company first developed a mechanical seal to prevent the leakage of hazardous fluids. Chesterton company for expertise in mechanical seals in design, selection, installation, field service. Mechanical seals ekk technologies eagle industry co. One of the two faces rotates rotary with the pump shaft and the other face does not rotate stationary. All face seals require a secondary seal, which can be some. 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. Mechanical seal installation location in pump a mechanical seal is installed on the impeller rotating shaft. 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.
Mechanical shaft seals pty ltd was established in 1989 and produce a wide range of seals to the international iso9001 quality system. 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. Mechanical seal operates in gas phase at top of mixer vessel providing unique corrosion and heat transfer characteristics forces on long shafts create shaft runout at the seal weight of the shaft and impeller must be supported by bearings in the gear box hydraulic upthrust of the shaft must be contained. Years ago, most pump shafts were sealed using rings of soft packing, compressed by a packing gland, but this type of shaft seal required a fair amount of leakage just to lubricate the packing and keep. American seal and packing delivers a full range of seals split, metal bellows, cartridge, single spring, configurations and component materials. Mechanical shaft seals this section briefly describes the design and elements of the mechanical shaft seal. Gogoal mechanical seal type1 shaft size 1 38 inches replace john crane type11 38 inches for industrial pump and water pump 4. With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. One part of the seal, either to static or rotary portion, is always resiliently mounted and spring loaded to accommodate any small shaft deflections, shaft movement due to bearing tolerances and outof. A mechanical seal is a device that helps join systems or mechanisms together by preventing leakage e. Remove the stationary mating ring of mechanical seal 433.
Differ ent seal types within these groups are described the skf. A mechanical seal, figure 1, consists of a stationary member seat. Mechanical shaft seal tamar tech mechanical sealling solutions. Our innovative, awardwinning mechanical seals for pumps, agitators, mixers, and other rotating equipment simplify installation, improve reliability, and extend the performance of fluid handling. An oring or cup seal seals the mating ring in the housing. These mechanical seals are applied in a wide range of industries, including petroleum refining, chemical, paper milling, steelmaking, water supply.
It is in the last position of the type designation and consists of four letters. Mechanical shaft seal by tamar can fit any equipment such as. This seal design was amount the first single spring seals and proceeded the slightly less expensive type 21 seals. Loosen and remove the rotating assembly of mechanical seals 433. A few basic components and principles in mechanical seal design contribute to a working seal at the interface of the rotating shaft and stationary pumpmixer seal chamber housing. We will manufacture and design seals to suit any customer requirements. Use the dimensional cross reference by shaft size guide pgs. When sealing a centrifugal pump, the challenge is to allow a rotating shaft to enter the wet area of the pump.
The standard also describes the shaft seal designation and material codes to be used. The seal between the rotating member and shaft or shaft sleeve 4. Sometimes operating conditions change to become quite different from the specific conditions for which the seal was intended. The chapter describes mechanical shaft seals used in grundfos pumps as examples of the variety of shaft seal solutions for different. Silicon carbide due to the low friction generated between these two faces. Mechanical seals were originally designed to lend a greater sealing capability than could be achieved using common packing. One face is fixed to the equipment casing or vessel, while the other is fixed to the shaft. Mechanical seals have the purpose of preventing leakage of a fluid. Spring retainer positions and centers the spring, aiding the concentricity between. Owing to this arrangement, the resistance to the flow through a clearance between the rings varies depending on the manner in which the recesses in the rings register one with another when the rings rotate relative to each other, the seal operates under. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. The mechanical seal itself is the interface between the static and rotary portions of the seal. A mechanical seal is a method of containing fluid within a vessel typi cally pumps where a rotating shaft passes through a stationary hou sing or occasionally.
Mechanical seals for mixers and specialty equipment. Mechanical seal basics a mechanical seal is a device that houses two highly polished components known as faces. Mechanical seals standard oem mechanical seals uk seals. Because mechanical shaft seal failures are the number one cause of pump downtime, we decided to dedicate this column to mechanical seal basics. The asp type 1 mechanical seal single spring seal dimensionally conforms to astm f151194 and for most applications is a direct drop in replacement for an original equipment seal.
As a comprehensive manufacturer of pumps, torishima has never lost sight of the importance of. Multispring seal double, double cartridge seal, reservoirs and wave spring seal protected spring. This article will explain what a mechanical seal is and the key design features that make them work. As previously stated, a pump with a through shaft is not leakproof. Position 1 codes position 1 of the mechanical shaft seal variant code shows the grundfos type designation. Viscous and sticky products creamy products, ointments, cosmetics, gels, etc determining the mechanical seal design and the appropriate materials for each application is essential in order to cut costs. Packing although mechanical seals had been around for many decades, by 1955 industry had converted only a small percentage of pumps from packing to mechanical seals. Mechanical seal technology and selection eagleburgmann. No rubbing friction between shaft and seal parts replace packing with a mechanical seal and avoid expensive shaft or sleeve replacements. Tamar mechanical shaft seal can easily replace mechanical seal. Before the advent of mechanical seals, pump users relied primarily on rope or braided style packing to achieve a seal around the shaft. The manufacturer listings are alphabetical, refer to pages 7. This gives rise to the alternative name radial face seal, pump seals or packings. These mechanical seals are applied in a wide range of industries, including petroleum refining, chemical, paper milling, steelmaking, water supply and sewerage, food processing and ship building.
The seal ring which rotates with the shaft is called the rotary ring. Single spring mechanical seals mechanical shaft seals. Other metal parts except seal cover and shaft sleeve. Sep 17, 2014 because mechanical shaft seal failures are the number one cause of pump downtime, we decided to dedicate this column to mechanical seal basics. Mechanical seal working animation types of mechanical seal duration. Introduction to failures failure of the mechanical shaft seal is the most common cause of pump downtime. A mechanical seal having a movable ring and a stationary ring with recesses provided in the opposed faces of said rings. Mechanical seals are leakage control devices, which are found on. Mechanical seal leakage in pumps how much, if at all, mechanical seals do, must or must not leak is a controversial subject for which there are few clear answers. Mar 04, 2014 mechanical seal working animation types of mechanical seal duration. Popular mechanical seal mating rings come in ceramic white and sintered nickeliron gray. Radial shaft seals freudenberg sealing technologies. This facilitates the exchange of shaft seal information between shaft seal suppliers and users.
A secondary elastomer bellows seals the primary ring to the shaft. Seal basics a mechanical seal is a device used to seal the interface between a rotating shaft and a stationary housing figure 1. A mechanical seal is simply a method of containing fluid within a vessel typically pumps, mixers, etc. This is commonly seen in centrifugal pumps although this challenge also exists in other equipment such as agitators, turbines, compressors, centrifuges, and blowers. Water, oil, and chemical mediums with weak corrosion.
We offer a wide selection of head types and mating ring designs and stock thousands of seals in differing materials of construction. The effectiveness of a seal is dependent on adhesion in the case of sealants and compression in the case of gaskets a stationary seal may also be referred to as packing. This video was made using our mechanical seal basics training software which covers a large range of seal types like pusher seals, nonpusher seals, cartridge seals, split seals, double seals. Mechanical seals are used in industrial pumps, compressors, and other applications where a spinning shaft protruding into a wetted process is likely to have continuous, rigorous duty. Since our subject is dealing with pumps, lets first explore a basic. Pump mechanical seal centrifugal, horizontal cn sealm series user manual this copy of the manual is a translation of the italian version and both manuals must be always furnished together model. Mechanical seals technical manual brenner industrial sales. This allnew cr seals handbook from sf combines or best ideas and insihs from he ast and he resen we hoe i beomes yor. As previously stated, a pump with a throughshaft is not leakproof. Mechanical seal basics and seal selection process training.
It reduces leakage between the pump and the surroundings to an absolute minimum. B s haft size a type k, r, and t shaft size a seal o. Mechanical shaft seal by tamar company that replace mechanical seal and specializes in development mechnical sealing systems is the patent solution for you. Automatic adjustment compensates for abnormal shaft end play, runout, primary ring wear and equipment tolerances. Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. The hlps is a severe duty pressure seal and has a unique design with several features that greatly improve its overall performance. The highlow pressure seal hlps from freudenberg sealing technologies is a fieldproven, specialtydesigned high pressure radial shaft seal. Mechanical shaft seal types and sealing systems grundfos. Mechanical seals move the point of the seal away from the shaft to specially designed sealing faces that gradually wear down. Skf industrial shaft seals and accessories are divided into three main groups. Pump mechanical seal centrifugal, horizontal cn seal m series user manual this copy of the manual is a translation of the italian version and both manuals must be always furnished together model. Shaft seals combined materials stationary ring ceramicsictc rotary ring carbonsictc secondary seal nbrepdmviton spring and punched parts steel working conditions mediums. Wherever a rotating shaft moves fluid, mechanical seals play a key role in sealing process fluids in, keeping contaminants out, or both.
Mechanical seal installation location on shaft mechanical seals are mostly comprised of two rings. The mechanical shaft seal is essentially a throttle arranged around the shaft. A few basic components and principles in mechanical seal design contribute to a working seal at the interface of the rotating shaft and stationary pumpmixer sealchamber housing. This document is intended to clarify what to expect on mechanical seals found in colfax products. Flexible seals means longer service life compared to packing, mechanical seals are more flexible, and are able to compensate for shaft deflection, axial and radial end play, vibration and seal face wear. Mechanical seals for rotating shaft applications move the point of the seal away from the shaft to specially designed sealing faces that gradually wear down. Mechanical sealmixer application data sheet customer contact info. Single and double lip radial shaft seals rated for pressures up to 90 psi.
358 686 699 240 696 1574 442 976 817 1184 965 39 631 532 188 407 751 1127 387 607 803 172 419 1266 1523 272 1217 223 1191 1213 346 327 1231 923 771 182 318 481 915 1276 789 1493 841 1081 119 362 1213