Introduction the mechanical seal acts as a check valve and a slider bearing. Probably the most widely recognized and also most common mechanical seal used in general service, low pressure applications. Recirculation from pump discharge through flow control orifice to the seal. Mechanical seal configuration codes for torishima mechanical seals a number and a code indicate the configuration and materials used in each torishima mechanical seal. With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. Plan 03 plan 65b plan 66a plan 66b what seal flush from pump discharge through orifice. Failure of outboard mechanical seal assembly failure of inboard mechanical seal assembly external seal characteristics leak internal seal leak 5. If you are still in doubt, send a sample seal along with this sheet. Mechanical seals are designed to overcome these drawbacks. Mechanical seals for pumps goulds, durco, and more. A mechanical seal is a shaft sealing device, which forms a running and dynamic seal between the.
The product pressure acts additional to the spring on the rotating seal part. It reduces leakage between the pump and the surroundings to an absolute minimum. Mechanical seal piping plans single seals dual seals plan 62 plan 65a plan 72 plan 74 plan 75 plan 76 fta157eng rev 1214. Pump mechanical seal centrifugal, horizontal, lined cl 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. The seals are classified as h, m or l according to load, with h and m indicating heavy load and l.
As a comprehensive manufacturer of pumps, torishima has never lost sight of the importance of. Mechanical seal selection the spring is in the product. This article will explain what a mechanical seal is and the key design features that make them work. Double or dual mechanical seals are designed to ensure maximum sealing safety. This document is intended to clarify what to expect on mechanical seals found in colfax products. Containment seal chamber drain for noncondensing leakage. The seat is statically sealed to a nonmoving cover. Dirt or contamination in between the mechanical seals.
Seal water is sarbs pump maintenance seminar, june 7, 2012 minimum discharge pressure 5psi 3bar seal water is the seal face lubricant a 5 psi. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. Recirculation from pump discharge through a flow control orifice and cooler into the seal chamber. Centrifugal pump basics how centrifugal pumps work working principle hvacr duration. Goulds seal plus sp1 and sp2 are changing all that. Anthony 04547 pentair purex hydrotech l series p28280 pentair sta rite industries aj series u109 93ss pentair sta rite industries dura glas pre 1998 dura glas u109 93ss pentair sta rite industries max e glas pre 1998 u109 93ss pentair sta rite. The minimum flow requirement for a given refrigeration pump can be established by the following procedure. Replacement seal kits seal kits for ac pump, aurora, gorman rupp, hoffman pumps, paco, peerless and taco kits contain mechanical seal and associated parts that are included in the oem kits inch sizes are cost competitive and similar to our ps line metric sizes include specialty seals for aquascape, ebara, flygt, gpm, grundfos. On both of the above setups, the installation of a suitable device is required to seal. The head is statically sealed to and rotates with a pump shaft. Anthony 04547 pentair purex hydrotech l series p28280 pentair sta rite industries aj series u109 93ss pentair sta rite industries dura glas pre 1998 dura glas u109 93ss pentair sta rite industries max e glas pre 1998 u109 93ss. What deadended seal chamber with recirculation from seal chamber no flush.
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. From the company you trust for the best process pumps in the industry, look to goulds now for the most economical and reliable seal alternatives. Numerous material options are available for bushings. Because mechanical shaft seal failures are the number one cause of pump downtime, the writer decided to dedicate this column to mechanical seal basics. If the pump begins to stumble even more quickly, the operator should reopen the stop valve and establish a minimum flow requirement via the bypass line. Mechanical seal education tutorials mechanical seal. Double seals provide a level of safetyzero emissions compliance not possible with single seals. Change a mechanical seal on the taco ta series pump. Mechanical seals explained aesseal component seal division. Mechanical seals are usually endface seals or rotatingface seals, but in some designs they can be circumferential or even a hybrid of liptype seals.
What is a double seal and when to use one double seals. These mechanical seal are a result of two decades of experience in design, manufacture and operation of seals. 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. The head has a springloaded, highly polished, very flat face that is also frequently pressureloaded against that same seat face. 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. The seals are designed for universal use and fit perfectly into the installation spaces standardised in the chemical industry, e. Size head ring ring bore code notes pump nameplate data mfg. Increase your ability to specify seals to improve mechanical seal reliability mechanical seals for pumps. The obvious function is that of a check valve to prevent liquid under pressure from leaking out of the pump, or from drawing air into the pump when under vacuum conditions.
Sep 23, 2015 centrifugal pump basics how centrifugal pumps work working principle hvacr duration. The chapter describes mechanical shaft seals used in grundfos pumps as examples of the variety of shaft seal solutions for different. 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. The mechanical shaft seal is essentially a throttle arranged around the shaft. 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. Berkeley b54585, model b3tpms, closecoupled centrifugal pump, b series, 1 hp, 230 volts, 1 phase, 1800 rpm, 3 npt discharge, cast iron impeller, mechanical 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. Clean gasket and flange faces, seal seat cavity, seal head bore and shaft, in particular.
Mechanical seal single mechanical seals spring rotating ring stationary ring. 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. 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. The seals are arranged by shaft size from smallest to largest. Cast iron, ductile iron, steel externals and stainless steel. A mechanical seal, figure 1, consists of a stationary member seat. At one half to one third of the best efficiency point, a secondary. For years, conventional mechanical seals have been used in applications where, often due to cost, cartridge seals were prohibitive. The seals are classified as h, m or l according to load, with h and m indicating heavy load and l indicating light load. Use care when handling lapped running surfaces of the mechanical seal to ensure they remain clean and are free of chips or scratches. The inboard or, primary seal keeps the product in the pump housing. Sealing systems for pumpssealing systems for pumps part i. As previously stated, a pump with a throughshaft is not leakproof. The materials of seal construction, particularly the sealing faces and elastomers.
Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. An eroded, worn, or fretted dynamic oring or gasket as the mechanical seal moves. The mechanical seal is a precision product and should be handled accordingly. How to respond to mechanical seal leakage in a centrifugal pump. Typically mechanical seals are installed on pumps and mixers. Seal type the mechanical seal shown in the pump photograph is a type 1 mechanical seal. Apart from ensuring the accurate placing of the seal on the pump shaft there is little to be done to compensate for such movement. Mechanical seal technology and selection eagleburgmann. 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. Viking pump a unit of ide corporation cedar falls, ia 2017 section 630 page 630. The mechanical seal type series 5kscb2 is available as single cartridge seal, single cartridge seal in quench design and double cartridge seal.
Seal options include packing, single component seals, cartridge lip seals and cartridge single and double mechanical seals. At utex, we refer to this type as rs1 the assembly shown in the pump is configured with a. 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 shaft seals this section briefly describes the design and elements of the mechanical shaft seal. 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. The manufacturer listings are alphabetical, refer to pages 7. Plan 21 22 plan 02 application where pump fluid does not condense at ambient temperature. The double mechanical seals can be provided by fristam in two different arrangements. Plan 11 is the default seal flush plan for all single seals. Most common plans and sealing systems plan 53b plan 53c plan 52 used where the pumped product is. Berkeley b54585, model b3tpms, closecoupled centrifugal.
Gogoal mechanical seal type1 shaft size 1 38 inches replace john crane type11 38 inches for industrial pump and water pump 4. Mechanical seals the shaft seals used in rotating machinery such as pumps, hydraulic turbines. Increase seal chamber pressure and fluid vapor margin. The outboard or, secondary seal prevents leakage of the flush liquid into the atmoshere.
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. Pump mechanical seal centrifugal, horizontal, lined cl 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. Pumps with mechanical seals perform more efficiently and undoubtedly have much more reliable performance for extended periods of time. Seal basics a mechanical seal is a device used to seal the interface between a rotating shaft and a stationary housing figure 1. Sealplus mechanical seals goulds pumps pdf catalogs. If you are unable to identify the seal, it will be necessary for you to. A mechanical seal pump could potentially save you a lot of annual costs.
Mechanical face seal replacement how to use this catalogue locate the manufacturer of the equipment. Therefore standard mechanical seals are used only for a pressure up to 10 bar. Our mechanical seal inventory includes goulds centrifugal pump mechanical seals, roper pump mechanical seals, durco pump mechanical seals, flygt mechanical seals, and griswold pumps mechanical seals just to list a small selection of our extensive inhouse. 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. M pumps process srl via dellartigianato, 120 45015 corbola ro italia tel.
A mechanical seal is simply a method of containing fluid within a vessel typically pumps, mixers, etc. 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. Given the general geometry of a mechanical seal, anywhere that theres a gasket or an oring, there ensues a potential leak point. When the sealing is achieved by means of a mechanical seal, the chamber is commonly referred to as a seal chamber. Mechanical shaft seal types and sealing systems grundfos. 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.
These seals virtually eliminate leakage of the fluid or gas being handled in pumps or mixers. Site includes information for hvac designers, engineers, plumbing contractors and consumers. Taco is a manufacturer of hydronic systems and equipment for residential, light commercial, industrial and oem markets. Figure 1 shows a typical centrifugal pump, which highlights its constituent parts, including the mechanical seal. These seal are best suitable for application involving abrasive, corrosive and viscous fluids. This is commonly seen in centrifugal pumps although this challenge also exists in other equipment such as agitators, turbines, compressors, centrifuges, and blowers.
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