To install a seal, the pump would have to be taken offline and disassembled. Symbols a area of sliding face a h area hydraulically loaded by medium pressure b width of sliding face. Mechanical seal configuration codes for torishima mechanical seals a number and a code indicate the configuration and materials used in each torishima mechanical seal. Torishimas mechanical seals mechanical seal applications mechanical seals the shaft seals used in rotating machinery such as pumps, hydraulic turbines, agitators and centrifuges play. Types of mechanical seals and their characteristics are given below for your ease to choose the rightone for you. The seals are classified as h, m or l according to load, with h and m indicating heavy load and l indicating light load. It has combined the aspects of seal design, testing, standardization, and applications to provide the users and oems alike with a common source of.
Unbalanced mechanical seal with short stationary ring without slot for antirotation pin. Many individual internal and extern al factors, as well as interactions between them. A mechanical seal is simply a method of containing fluid. Requires leakage or it will burn will seal with invisible leakage. Must be finished in the same manner as the rotary face. Mechanical seals are simply another means of controlling leakage of a process where other means are deemed to be less capable of performing the task adequately. For double mechanical seals backtoback en specifies the short type only. Sealing systems for pumpssealing systems for pumps part i. Flowserve provides sealing solutions as a single resource for the improvement of end user rotating equipment operations. The complete product portfolio of systems and components for cooling, flushing, pressurization and supplying liquid and gaslubricated mechanical seals e. If you are unable to identify the seal, it will be necessary for you to. Mechanical seals, third edition is a source of practical information on the design and use of mechanical seals. Mechanical seals come in a wide range of designs however the most important factor when determining how long a seal is going to last, is deciding on the right seal face materials. Mechanical seals are typically used in applications for superior sealings.
Instead the torque is driven along the rubber bellow which fits on the shaft. The remaining components are referred to as hardware. On difficult applications the will groove and wear shafts and sleeves. Mechanical seals technical manual brenner industrial sales. Mechanical seals are subject to a number of failure modes and hence must satisfy a. As mechanical seals can be used to seal a myriad of different. Mechanical seal technology and selection eagleburgmann. Mechanical seals is not a seal but rather a restricting device. Different types of mechanical seal pump heat transfer.
The ability of a mechanical seal to meet its performance objectives depends upon a wide range of factors involving equipment design, operating conditions, and support systems. This articles describes some of the commonly used mechanical seal types like. Seals have more flexibility than packing and are able to compensate for shaft deflection, axial and radial end play, as well as vibration and wear of the sealing faces. Please contact us for pricing and further information, including technical datasheets. Typically mechanical seals are installed on pumps and mixers. Spread throughout the world, this type of mechanical seal has reached an unsurpassed quali ty level. 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.
The complete product portfolio of systems and components for cooling, flushing, pressurization and supplying liquid and gaslubricated mechanical seals. You must consider the environment the seal will be exposed to. Mechanical seals are subject to a number of failure modes and hence must. These seals are generally used in sewage applications and waste water pumps. 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 manufacturer listings are alphabetical, refer to pages 7. Techmachine design 16481d1509 gudlavalleru engineering college sheshadri rao knowledge village, gudlavalleru, pin. There are a number of mechanical seal types, each providing advantages for specific applications. Mechanical seal types rotary shaft seals uk seals ltd. A mechanical seal, figure 1, consists of a stationary member seat. Topics range from design fundamentals and test rigs to leakage, wear.
Mechanical seals first in a series by ann attenasio. Pusher type seals use an axially mounted spring on the shaft sealing assembly to impart a fixed sealing force to the seal effacement. Seal type the mechanical seal shown in the pump photograph is a type 1 mechanical seal. Suitable for a wide range of service conditions ranging from water and steam to chemicals and corrosive materials, the type 1 mechanical seal is ideal for use in pumps, mixers, blenders, agitators, air.
For the purposes of this discussion, consider that a mechanical seal will outperform common types of packing. 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. There are many types of mechanical seal, ranging from simple single spring designs to considerably more complex cartridge seal types. Spring retainer positions and centers the spring, aiding the concentricity between the spring and. Bulletin number twentynine selecting mechanical seals. Figure 1 shows a typical centrifugal pump, which highlights its constituent parts, including the mechanical seal. 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. Mechanical seals areconstructed of a wide range of materials. Mechanical seals are designed to produce an acceptably low l evel of leakage to function effectively. Mechanical seals are designed to handle a range of motions and conditions, but they are just one machinery component in a larger system.
All mechanical seal types are available in a range of sizes and materials. Advancements in mechanical sealing api 682 fourth edition abstract api 682 iso 21049 is the leading document for mechanical seals in petrochemical, chemical, and pipeline services. Mechanical seal types uk seals has a very extensive range of mechanical seal types. Included in this list is the selection of the materials of construction of the seal. Different types of mechanical seal free download as pdf file. In this pdf, you can learn or know the different types of mechanical seal. A mechanical seal is simply a method of containing fluid within a vessel typically pumps, mixers, etc. This document is intended to clarify what to expect on mechanical seals found in colfax products.
The stationary part of the seal is fitted to the pump housing with a static seal this may be sealed with an oring or gasket clamped between the stationary portion and the pump housing. On difficult applications the leakage ratio between seals and. Our collection of mechanical seals is supported by strong aftermarket services, and provides users with safety and environmental benefits. Secondary seals consisting of orings or other suitable gaskets. There are various types and arrangement of the mechanical seals being used for the centrifugal pumps. Mechanical seals explained the basics mechanical seals are leakage control devices, which are found on rotating equipment such as pumps and mixers to prevent the leakage of liquids and. Type 1 elastomer bellows seals john crane mechanical seals. Cartridgepusher seal basically is installed with moving secondary seal. Shaft seals combined materials stationary ring ceramicsictc rotary ring carbonsictc secondary seal nbrepdmviton spring and punched parts steel working conditions mediums. Mechanical shaft seal types and sealing systems grundfos.
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. Probably the most widely recognized and also most common mechanical seal used in general service, low pressure applications. Mechanical face seal replacement how to use this catalogue locate the manufacturer of the equipment. Mechanical seals are designed to overcome these drawbacks. A mechanical seal is a shaft sealing device, which forms a running and dynamic seal between the rotating and stationary parts of a rotary equipment, developed to overcome the disadvantages of the traditional compression gland packing. With its proven track record of exceptional performance, the type 1 elastomer bellows seal is widely recognized as the industrys workhorse. 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. Mechanical seals come in a wide range of designs however the most important factor when determining how long a seal is going to last, is deciding on the. In cooperation with our alliance customers, we have improved. Mechanical seals according to en 12756 code system for single mechanical seals there is a distinction drawn between standard n and short k types. Advancements in mechanical sealing api 682 fourth edition abstract api 682 iso 21049 is the leading document for mechanical seals in petrochemical, chemical, and pipeline services worldwide. For instance, failures of mechanical seals are evaluated in 34, failure modes are analyzed in 5 and improving reliability of seals is discussed in 69. Material selection for mechanical seals by michael huebner staff engineer flowserve corporation flow solutions division deer park, texas.
The old adage pay me now or pay me later applies to seals. Shaft seals combined materials stationary ring ceramicsictc rotary ring carbonsictc secondary seal nbrepdmviton spring and punched parts steel working conditions. The functional categories of a mechanical seal are. 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. This article will explain what a mechanical seal is and the key design features that make them work. In this pdf, you can learn or know the different types of mechanical seal manufacture by globe star engineers india pvt. Mechanical seal working animation types of mechanical seal. The seals are arranged by shaft size from smallest to largest. All facetype mechanical seals consist of a primary seal. H and l types are typically singlespring seals, while the m types are multispring units. Lts or lqt reservoirs, or elements such as cyclones. All the above gives rise to extremely demanding requirements for the mechanical seals and for the auxiliary elements supplied with them. The initial closing force ensures that the seal will function properly from startup. Many individual internal and extern al factors, as well as interactions between them, will affect the rate of seal leakage.
Mechanical seals explained the basics mechanical seals are leakage control devices, which are found on rotating equipment such as pumps and mixers to prevent the leakage of liquids and gases from escaping into the environment. At utex, we refer to this type as rs1 the assembly shown in the pump is configured with a. The chapter describes mechanical shaft seals used in grundfos pumps as examples of the. The bta2 features all carbon or high quality resin. Flowserve seals are used on a variety of rotating equipment, including pumps, compressors, mixers, steam turbines and other specialty equipment.
A technical seminar on types of mechanical seals presented by n. Understanding the basics of mechanical seals and how they may be adapted for different application requirements is critical for choosing the best seal for the job and ensuring optimal system reliability. Jun 10, 2017 ningbo grandbroad mechanical seals mfg. Water, oil, and chemical mediums with weak corrosion. In end or rotatingface mechanical seal designs, the initial closing force is provided by a spring component, which can be a single coil spring, multiple coil back to basics. Request pdf types of seals seals are devices used to prevent or limit leakage of fluids or particulates. A mechanical seal is a shaft sealing device, which forms a running and dynamic seal between the rotating and stationary parts of a rotary equipment, developed to. Dec 29, 2012 types of mechanical seals and their characteristics are given below for your ease to choose the rightone for you.