The double mechanical seals can be provided by fristam in two different arrangements. We specialize in hardtofind seals and demanding applications. Mechanical seals are used in industrial pumps, compressors, and other applications to provide a leakproof seal between component parts. Vulcan offer the widest range of standard mechanical seals available from any company anywhere. The mechanical shaft seal is essentially a throttle arranged around the shaft. The inboard or, primary seal keeps the product in the pump housing. A mechanical seal is a device that helps join systems or mechanisms together by preventing leakage e. Symbols a area of sliding face a h area hydraulically loaded by medium pressure b width of sliding face. Its nonclogging single spring mechancial seal design makes it ideal for pulp and paper, waste water, and many other demanding pump shaf seal applications. Some common types of pump seals michael smith engineers. This seal catalog is not an operations or safety manual. Nspl pump seal design api 682 based on api 682, all mechanical seal shall be cartridge design. Seal type the mechanical seal shown in the pump photograph is a type 1 mechanical seal. The rotating and the fixed faces are the two vital parts of the mechanical seals.
Probably the most widely recognized and also most common mechanical seal used in general service, low pressure applications. Read on for a basic understanding of mechanical seals, and how they differ from packing. Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. Secondary seal nbrepdmviton spring and punched parts steel working conditions mediums. Spring provides positive pressure for sealing between the sealing faces. Moreover, mishandling of the seal and using the wrong lubricant during the maintenance can also result to the seal failure. Shaft seals can take many different forms, but all serve the common purpose of keeping the liquid in the pump. The diagrams show seals with n type seats, although different seats are available. As a comprehensive manufacturer of pumps, torishima has never lost sight of the importance of. The shaft seal is exposed to widely varying operating conditions.
Size head ring ring bore code notes pump nameplate data mfg. With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. For double mechanical seals backtoback en specifies the short type only. Mechanical seal maintenance often involves removing parts and improper reinstallation of the parts can cause them to not be aligned properly thus leading to too much train during the shaft movement. Learn what input mechanical seal suppliers require to select the optimum seal design or type, the most economical and longlasting materials of construction, and the appropriate seal controls to comply with. Figure 1 shows a typical centrifugal pump, which highlights its constituent parts, including the mechanical seal. Mechanical shaft seal types and sealing systems grundfos. These seals are manufactured by full automated assembling lines at our global production sites, and has high market share in worldwide specifically in the category of seals for automotive water pumps. Berkeley part number b80698 for cw, b80696 for ccw.
Water, oil, and chemical mediums with weak corrosion. 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. Grundfos crn shaft seal kit pump cartridge mechanical seal cr32 45 64 90 grundfos sarlin pump 62kw pump model s. A two piece split stainless steel packing gland is available for replacement, order part number b82468. Table of contents vii chapter eight seal face mechanical loading devices, 71 8. Sometimes operating conditions change to become quite different from the specific conditions for which the seal was intended.
Conversion kit, single to double mechanical shaft seal 9611922175 pos. External reservoir at pressure below seal chamber pressure providing buffer liquid forced circulation. The rotating face is connected to the rotating shaft while the fixed face is connected to the pump housing. Mechanical seals according to en 12756 code system for single mechanical seals there is a distinction drawn between standard n and short k types. Api 682 most common plans and sealing systems castle pumps. The btar owes its success to the wide range of application, the short. Mechanical seal education tutorials single mechanical seals. The chesterton mechanical seal catalog is a starter reference source to help users identify. These mechanical seal are a result of two decades of experience in design, manufacture and operation of seals. Plan 11 is the default seal flush plan for all single seals.
Type 1 elastomer bellows seals john crane mechanical. Compact, enclosed rubber bellows mechanical seal, with a bootmounted stationary with a smooth outer profile. The development of mechanical pumps was intimately linked with the progress of vacuum science up to the middle of this century when the introduction of both the sputter ion pump and the sublimation pump provided an alternate method for the production of low pressure. It can be demonstrated, from the seal comparison diagram below, that. Specification for horizontal end suction centrifugal pumps for. There are many different designs of a mechanical seal to meet specific applications. These seal are best suitable for application involving abrasive, corrosive and viscous fluids. The materials of the seal face are eagle industrys proprietary carbon components and sic which provides high resistance to heat, wear and corrosion. M pumps process srl via dellartigianato, 120 45015 corbola ro italia tel. Used for applications where products have high pressure and are. 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. Only experience can tell how frequently these overhauls are necessary. To avoid fretting corrosion from damaging your pump ensure that the seal you fit has a disposable sleeve and change that sleeve whenever you change the seal.
Because mechanical shaft seal failures are the number one cause of pump downtime, we decided to dedicate this column to mechanical seal basics. Type b single stage centrifugal pump berkeley b3zrm. Introduction to failures failure of the mechanical shaft seal is the most common cause of pump downtime. The outboard or, secondary seal prevents leakage of the flush liquid into the atmoshere.
Used a clean liquid from discharge pump or outside source contamination of the pumped product generally makes this type of flush undesirable if necessary, this fluid flush can be cooled and. Vulcan type 24, burgmann mg912, john crane type 521, roten type 52 12 14 16 18. Between the two faces of the mechanical seal the secondary seals, known as shaft and insert mountings, like orings, wedges and vrings are inserted. With over 40 years of experience in supplying quality replacement mechanical seals, we can help you identify the. Sleevemounted, rubber bellows mechanical seal, of compact unitised design, with elastomer shaft drive ring. 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. Some single seals incorporate a static oring together with a dynamic oring mounted onto a sleeve made as an integral part of the seal body, the chesterton 880 series seal is one example. With its proven track record of exceptional performance, the type 1 elastomer bellows seal is widely recognized as the industrys workhorse. Operators and engineers in plants of all sizes and industries will vouch for it. We supply mechanical seal and seal material, mechanical seal including mechanical pump seal, industrial pump seal, auto cooling pump seal, shaft seal, seal ring, carbide seal, etc. Indisputably, mechanical seal failure is the most common cause of pump downtime. 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. Function to provide the seal with a clean, abrasivefree lubricant and carry heat generated at the seal faces. As previously stated, a pump with a throughshaft is not leakproof.
A double mechanical seal consists of two seals arranged in a series. This copy of the manual is a translation of the italian version and both. At utex, we refer to this type as rs1 the assembly shown in the pump is configured with a. The outboard, or secondary seal prevents the flush liquid from leaking into the atmosphere. The 180 compact chassis is designed to fit ansi and api610 pumps. Failure of mechanical seal pump industrial processes. The pump seals have the characteristics of the reasonable structure, easy fixing, and long service life. Extend mechanical seal life fluid sealing association. The inboard, or primary seal keeps the product contained within the pump housing. To achieve this objective, mechanical seal support systems are selected to provide a suitable environ.
Most common plans and sealing systems plan 53b plan 53c plan 52 used where the pumped product is harmful hazardous and or buffer fluid may not contaminate the product. Mechanical seal for largeseries cold water pumps, produced in millions of units per year. The materials of seal construction, particularly the sealing faces and elastomers. It reduces leakage between the pump and the surroundings to an absolute minimum. Mechanical shaft seals this section briefly describes the design and elements of the mechanical shaft seal. A mechanical seal is simply a method of containing fluid within a vessel typically pumps, mixers, etc.
Tb1, tb1f and tb2p readyfitted mechanical seals are designed for the seal. The chesterton mechanical seal catalog is a starter reference source to. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. 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. Mechanical seals a type mechanical seals manufacturer. The difference between single and double mechanical seals. Wet contacting mechanical seals rely on the existence of a fluid film between the seal faces to minimize wear and friction and provide reliable performance. Spare parts lkh centrifugal pump harco enterprises. Mechanical seals for centrifugal pumps select seals. The seals have widely used in the various automobile water pumps. 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. Mechanical seals, seal supply systems, magnetic couplings, carbon floating ring seals, expansion joints, gaskets and packings as well as comprehensive services are used wherever reliability and safety are needed. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. Fluid enters a centrifugal pump through the suction nozzle at the center of a rotating impeller.
Spring retainer positions and centers the spring, aiding the concentricity between the spring and shaft. Mechanical seal technology and selection eagleburgmann. The stationary face is usually fitted with an antirotation device, depending upon face configuration and material of secondary seal. 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. Loosely inserted seal face provides selfadjusting capability. Sealing technology by eagleburgmann is used worldwide in oil and gas industries, refineries, the. The seal ring which rotates with the shaft is called the rotary ring. In this blog, we will talk about most common causes of seal failure and how to prevent such frequent failures.
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