Improper use of, or completely omitting mechanical seal flush plans its critical that a mechanical seal flush plan is properly in place. Heat exchanger the rwt23 tube in tube heat exchanger is used to cool the pumped fluid in the seal chamber of single or double acting mechanical seals. Sometimes operating conditions change to become quite different from the specific conditions for which the seal was intended. Sealplus mechanical seals goulds pumps pdf catalogs. Never put hands on lapped seal faces or put lapped seal parts face down on the workbench. Mechanical seals all seals the sealing specialists.
It is in the last position of the type designation and consists of four letters. 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. The shaft and pump housing must be highly wear resistant and well aligned. The sns endsuction pump has been designed to exceed the highest energy efficiency regulations across all industries and also the design requirements of iso 5199 international standard. Seal chamber and stuffing box both refer to a chamber, either integral with or separate from the pump case housing that forms the region between the shaft and casing where sealing media are installed. The seals are arranged by shaft size from smallest to largest. Installation,operation, andmaintenancemanual goulds pumps. Material selection for mechanical seals by michael huebner staff engineer flowserve corporation flow solutions division deer park, texas.
Model 3196 iframe installation, operation, and maintenance manual 5 introduction and safety introduction purpose of this manual the purpose of this manual is to provide necessary information for. 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 seals are designed to overcome these drawbacks. With its pump optimised design this seal has been approved for all of the pump s applications. Our product portfolio includes everything from mechanical seals and seal supply systems to magnetic couplings, carbon floating ring. The variant code of mechanical shaft seals is stamped on the pump nameplate. Mechanical shaft seals are frequently used instead of conventional packing and are standard equipment for most centrifugal pump services. In the critical sealing of boiler feed and boiler circulation water, flowserve continues to innovate new technology to optimize and extend performance. The purpose of this document is to instruct to a responsible use on installation, operation and maintenance of pumps series cn sealm. Failure to observe the instructions contained in this manual could result in personal injury and. The stationary part of the seal is fitted to the pump housing with a static seal this may be sealed. In a pusher type seal, there is also a dynamic gasket that.
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. Dec 16, 2014 mechanical seals can be very sensitive because the faces are incredibly flat. As part of the german freudenberg and japanese ekk group, eagleburgmann is one of the worlds leading providers of industrial sealing technology. This document is intended to clarify what to expect on mechanical seals found in colfax products. The materials of seal construction, particularly the sealing faces and elastomers. The seal ring which rotates with the shaft is called the rotary ring. There are many different designs of a mechanical seal to meet specific applications. A mechanical seal is simply a method of containing fluid within a vessel typically pumps, mixers, etc. With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. However, seal service life can fall short of expectations if the seal is exposed to conditions outside its intended operating environment. This article will explain what a mechanical seal is and the key design features that make them work. Pumps with mechanical seals perform more efficiently and undoubtedly have much more reliable performance for extended periods of time. If you are unable to identify the seal, it will be necessary for you to.
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. May 08, 2016 a mechanical seal can either wear out or fail. It is informational only and not an official part of the standard. A mechanical seal, figure 1, consists of a stationary member seat. Mechanical face seal replacement how to use this catalogue locate the manufacturer of the equipment. It reduces leakage between the pump and the surroundings to an absolute minimum. Mechanical seal pumps are more energy efficient and experience less wear and reduced maintenance due to the type of seals. Size head ring ring bore code notes pump nameplate data mfg. Different types of pumps mechanical seal piping plans are detailed in api 682 or iso 21049 standards pump seal piping plans for single seals. Pdf on apr 24, 20, gerard van loenhout and others published nuclear feed pump mechanical seal reliability upgrade find, read and cite all the. Mechanical seal pumps best price mechanical seal pumps.
Sealing systems for pumpssealing systems for pumps part i presented by. Application guidelines was created as a tool to be used by those who purchase or specify mechanical seals, as well as by the end users of rotating equipment in a wide variety of industries. Standard specification for mechanical seals for shipboard. These seal are best suitable for application involving abrasive, corrosive and viscous fluids. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the. Since its introduction in 1994, api 682 has become the standard that sets the global tone for the procurement and operation of seal and supply systems for centrifugal pumps in the oil and gas sector as well as in the petrochemical industry. It is used for services where leakage to atmosphere must be collected or diluted. A seal that lasts a week without letting go is generally thought to be ok. This seal design was amount the first single spring seals and proceeded the slightly less expensive type 21 seals.
Used where the seal chamber pressure is at discharge pressure mainly vertical pumps. Chesterton company for expertise in mechanical seals in design, selection, installation, field service. A comprehensive guide that is packed with userfriendly descriptions and explanations, tables, and photographs that rotating equipment oems. Mechanical seal technology and selection eagleburgmann. Ksb mechanical seals for water and waste water applications. Introduction to failures failure of the mechanical shaft seal is the most common cause of pump downtime. Common types of pumps mechanical seal piping plans. Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. A mechanical seal is a shaft sealing device, which forms a running and dynamic seal between the. Mechanical seals standard oem mechanical seals uk seals. 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. Bearing, mechanical seal and overall pump life are optimized.
Even a small amount of dirt or oil, even fingerprints, can cause the faces not to align. The rotating face is connected to the rotating shaft while the fixed face is connected to the pump. Mechanical seals technical manual brenner industrial sales. Deadended seal chamber with no circulation of flushed fluid. If the seal faces are not free to move easily at their interface with the orings they will hang up, the result of this hang up will be faces that open allowing leakage and abrasive damage the best seal designs have orings that ride on clean, highly polished surfaces as the faces wear the orings should. Single spring mechanical seals mechanical shaft seals.
High temperature seal selection shaft sealing systems the most difficult challenge for pumping hot fluids is to effectively seal the rotating shaft from emitting excessive or undesirable fluids into the atmosphere for the purposes of safety and equipment reliability. Mounted stator fms where the spring seal assembly is mounted to the pump housing. Keep the mechanical seal in its original container until ready for installation. Pumps operate by some mechanism typically reciprocating or rotary, and consume energy to perform mechanical work moving the fluid. All face seals require a secondary seal, which can be some. The manufacturer listings are alphabetical, refer to pages 7. Api 682 most common plans and sealing systems castle.
These mechanical seal are a result of two decades of experience in design, manufacture and operation of seals. Goulds seal plus sp1 and sp2 are changing all that. This gives rise to the alternative name radial face seal, pump seals or packings. It prevents the vaporization of the pump fluid between the seal faces. A mechanical seal consists of 2 principle components. Development a new test rig to examine mechanical seal.
The shaft seal is exposed to widely varying operating conditions. To install a seal, the pump would have to be taken offline and disassembled. Recirculation from pump seal chamber through a flow control orifice and back to the seal. The mechanical shaft seal is essentially a throttle arranged around the shaft. When the sealing is achieved by means of a mechanical seal, the chamber is commonly referred to as a seal. One of the two faces rotates rotary with the pump shaft and the other face does not rotate stationary. Single and double lip radial shaft seals rated for pressures up to 90 psi. Mechanical seal working animation types of mechanical seal. Mechanical shaft seal types and sealing systems grundfos. Seal chamber pressure an overview sciencedirect topics. Compact, enclosed rubber bellows mechanical seal, with a bootmounted stationary with a smooth outer profile. Checklist of problems vvith centrifugal pumps and their causes.
As previously stated, a pump with a throughshaft is not leakproof. Pumps can be classified into three major groups according to the method they use to move the fluid. Seal life shall be defined in terms of the time period in which the mechanical seal functions properly under its specified service. Vessel shaft mechanical seal for arresting leakage liquid agitator blade 23.
Plan 03 plan 65b plan 66a plan 66b what seal flush from pump discharge through orifice. With over 40 years of experience in supplying quality replacement mechanical seals, we can help you identify the seal you need and solve your sealing problem. If this seal face is little remaining carbon nose, the seal is worn out. Installation of the new proflo seals covered single spring seal. Sealing systems for pumps sealing systems for pumps. Failures in surface pumps can lead to spillage of the working fluid. Our innovative, awardwinning mechanical seals for pumps, agitators, mixers, and other rotating equipment simplify installation, improve reliability, and extend the performance of fluid handling. Sep 21, 2015 mechanical seals the basic design of a mechanical seal cosists of following elements. Most secondary seals are static meaning that there is no relative motion between the sealed components. The main parts of the mechanical seals are please refer the figure above.
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. Our technical staff is available to help you just give us a call. 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. Mechanical shaft seals this section briefly describes the design and elements of the mechanical shaft seal.
A seal that leaks after maintenance has been badly installed. Possible causes of mechanical seal failures turbomachinery. There is a lot of science in it but either you have the knack or you do not in which case you need this web site bad. Since our subject is dealing with pumps, lets first explore a basic. As part of the german freudenberg and japanese ekk group, eagleburgmann is one of the worlds leading. This abstract is a brief summary of the referenced standard. Sealing systems for pumpssealing systems for pumps part i. Average mechanical seal life has increased significantly during the last 20 years, with improvements in mean time between failure of 50 percent during the last 10 years alone. Our comprehensive stock of components ensures that we can build almost any seal combination for same day shipment. Most common types of pump seal piping plans for single seals are discussed in following paragraphs. Checklist of problems vvith centrifugal pumps and their causes centrifugal pumps are one of the worlds most commonly used devices. Good news is, for most part, such seal failures are. An essential mechanical seal contains three sealing points.
Mechanical seals first in a series by ann attenasio. Flowserve mechanical seal and seal support system storage. Different mechanical seals require different maintenance steps and while it is best to leave the maintenance to professionals, it pays to know about proper maintenance tips so that you will be able to know if your mechanical seals need maintenance or not. Mechanical seal pumps are centrifugal pumps with mechanical seals to prevent leakage of fluids. Seal failures in some systems, like electric submersible pumps, can lead to motor andor bearing failures. Mechanical seals are usually endface seals or rotatingface seals, but in some designs they can be circumferential or even a hybrid of liptype seals. Internal circulation from the pressure side to the seal chamber can also be integrated in the pump design with the same result. The rotating and the fixed faces are the two vital parts of the mechanical seals.
If the mechanical seals are stored for an extended period of time before. Piping plans help keep mechanical seals running cool and clean, promote safe handling of dangerous fluids, and extend the operational availability of rotating equipment. Our quality products are available through our ever growing network of domestic and international distributors. Standard mechanical seals in conformity with din 24 960 can be mounted without problems. Figure 1 shows a typical centrifugal pump, which highlights its constituent parts, including the mechanical seal. If some important dimensions are not marked on the drawings, please draw them and enter values. A pump is a device that moves fluids liquids or gases, or sometimes slurries, by mechanical action. Sulzer mechanical seals are strong by design and have been proven very reliable in various pumping applications. Position 1 codes position 1 of the mechanical shaft seal variant code shows the grundfos type designation.
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. After nearly six years of intensive work, the american petroleum institute api 682 mechanical seal standard is soon to be adopted. Mechanical seals are used in industrial pumps, compressors, and other applications to provide a leakproof seal between component parts. An api plan is widely used in vertical pump applications or when seal chamber pressure is at or near discharge pressure of the pump. Dec 10, 2014 possible causes of mechanical seal failures by william forsthoffer on december 10, 2014 to ensure reliable, troublefree operation for extended periods of time, the seal must operate in a properly controlled environment. Forsthoffer, in forsthoffers more best practices for rotating equipment, 2017. In fact, mechanical seal pumps offer optimal performance for higher pressures and more corrosive operation conditions.
Available with a wide range of seal faces including. 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. Nspl pump seal design api 682 based on api 682, all mechanical seal shall be cartridge design. Green 1 developed a test rig and examined mechanical seal performance variation from. Extend mechanical seal life fluid sealing association. Table of contents vii chapter eight seal face mechanical loading devices, 71 8. Increasingly strict environmental standards and harsher operating conditions have made pump sealing. Mechanical seal piping plans single seals dual seals plan 62 plan 65a plan 72 plan 74 plan 75 plan 76 fta157eng rev 1214. If the carbon face is substantial, seal has failed.
For years, conventional mechanical seals have been used in applications where, often due to cost, cartridge seals were prohibitive. Increase your ability to specify seals to improve mechanical seal reliability. This style seal has been engineered to be inexpensive to manufacture and to be durable in service. A few basic components and principles in mechanical seal design contribute to a working seal at the interface of the rotating shaft and stationary pump mixer seal chamber housing. Apr 14, 2014 where do we need seals source mechanical seals try to solve an age old problem of preventing pumped fluid from leaking into the environment. Quality mechanical seals mechanical seals can be found in centrifugal pumps pool and spa pumps compressors progressive cavity pumps gear boxes rotary lobe pumps gear pumps slurry pumps jet pumps submersible pumps petrochemical pumps turbine pumps. Pdf nuclear feed pump mechanical seal reliability upgrade. Mechanical shaft seal with rotating seal ring and stationary seat. Mechanical seal selection fristam has many years of experience in the manufacture of mechanical seals and is able to provide the best mechanical seal for any application. Flowserve mechanical seal and seal support system storage experience in motion 1 mechanical seals general note mechanical seals are precision products and therefore require careful handling and storage to ensure reliable operation. About us at the leading edge of industrial sealing technology. Mechanical seal education tutorials mechanical seal installation.
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