These seals are generally used in sewage applications and waste water pumps. The purpose of this document is to instruct to a responsible use on installation, operation and maintenance of pumps series cn sealm. Unfortunately, in many plants over half the pumps may still use stuffing boxes. Srm00046, general installation, operation, maintenance and troubleshooting manual for three screw and cig series pumps,circor, 2015 seal faces cannot be permitted to run dry, as. 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. Why continuous seal chamber venting on vertical pumps. With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. Viking universal seal pumps series 124a, 4124a, 124ae.
Among others, you will find current data sheets in pdf format available for. Hot bturrgmtrgaanmetcghil shlategla bts rlal hgr btys oagtexms o btp rgxg rg fitnqtrsmghfisn tnqtmnfilfisn 4fdtecmrwsterwd type bta2. Sealing systems for pumps sealing systems for pumps. As a result, the quality and durability of a mechanical seal have a major influence on the. The softer mechanical seal face usually has a smaller mating surface and is commonly called the wear nose of the mechanical seal. Thebta2issuitableforcirculationmassage pumpsforwhirlpoolsandcleanwaterpumps. At utex, we refer to this type as rs1 the assembly shown in the pump is configured with a. This is commonly seen in centrifugal pumps although this challenge also exists in other equipment such as agitators, turbines, compressors, centrifuges, and blowers.
As a result, the quality and durability of a mechanical seal have a major. Often, but not always, pumping systems contain a coupling, which attaches the driver to the rotary shaft of the pump. Recirculation from pump discharge through flow control orifice to the seal. It reduces leakage between the pump and the surroundings to an absolute minimum. Sealing systems for pumpssealing systems for pumps part i. The elasticity of the bellows design enables a more robust operation. This document is intended to clarify what to expect on mechanical seals found in colfax products. The shaft seal is exposed to widely varying operating conditions. Instead the torque is driven along the rubber bellow which fits on the shaft. Viking universal seal pumps series 124a, 4124a, 124ae, 4124ae, 4124b, 224a, 4224a, 224ae, 4224ae, 4224b, 324a, and 4324a cast iron 126a, 4126a, 226a and 4226a ductile iron 123a, 4123a, 223a and 4223a, 323a, 4323a steel externals 127a, 4127a, 227a and 4227a, 327a, 4327a stainless steel pump casing can be rotated in 45o increments.
Mechanical seals technical manual brenner industrial sales. 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. On both of the above setups, the installation of a suitable device is required to seal. Mechanical seals the shaft seals used in rotating machinery such as pumps, hydraulic turbines, agitators and centrifuges play an important role in. Since our subject is dealing with pumps, lets first explore a basic. By changing from stuffing boxes to seal chambers, the user has a greater selection of seals options, benefits of improved seal cooling, and potential for greater seal reliability. Gogoal mechanical seal type1 shaft size 1 38 inches replace john crane type11 38 inches for industrial pump and water pump 4. Mechanical shaft seal types and sealing systems grundfos. M pumps process srl via dellartigianato, 120 45015 corbola ro italia tel. Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. Mechanical seals are designed to overcome these drawbacks. Bearing, mechanical seal and overall pump life are optimized. Both the seal chamber and the stuffing box have the primary. Piping plans help keep mechanical seals running cool and clean, promote safe handling of dangerous fluids, and extend the operational.
The seals are arranged by shaft size from smallest to largest. Mechanical face seal replacement how to use this catalogue locate the manufacturer of the equipment. 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 modules listed in the overview are linked to the corresponding pages. Materials of construction xs3x49 xs6x89 1 volute case, flanged na 3054620 cast iron, astm48 class 30. Introduction to failures failure of the mechanical shaft seal is the most common cause of pump downtime. Recirculation from pump discharge through a cyclone separator, clean fluid to seal chamber, contaminated fluid to suction. Mechanical seals areconstructed of a wide range of materials. If you are unable to identify the seal, it will be necessary for you to. Every centrifugal pump must accommodate a spinning shaft while mechanically maintaining fluid or gas contained in the wet end of the pump.
Seal flush from pump discharge and recirculation to pump suction with orifices. Seal basics a mechanical seal is a device used to seal the interface between a rotating shaft and a stationary housing figure 1. Api 682 most common plans and sealing systems castle pumps. For over 60 years, we have provided quality products through our network of distinguished nationwide distributors. Mechanical seals and more sealing technology by eagleburgmann is used worldwide in oil and gas industries, refineries, the petrochemical, chemical, and pharmaceutical industries, food processing, energy, water, mining, paper, aerospace, and other industries. Pumpnseal australia is an australian owned and operated company established in 2000. This article will explain what a mechanical seal is and the key design features that make them work. 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. Trusted supplier of quality mechanical seals and supporting products for more than 50 years. To enable your ksb pumps to operate at their best, we offer lowwear mechanical seals that have been developed inhouse for different pump type series. 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. When the sealing is achieved by means of packing, the chamber is referred to as a stuffing box. A mechanical seal, figure 1, consists of a stationary member seat.
A wide range of mechanical seal designs exist for this type of pumps, which operates in especially difficult conditions with high salt concentrations this parameter varies, depending on the sea, at high pressures, 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. 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. In systems with highly corrosive fluids, are recommended mechanical seals with external springs. Api 682 most common plans and sealing systems castle. Included in this list is the selection of the materials of construction of the seal. The manufacturer listings are alphabetical, refer to pages 7. Plan 11 is the default seal flush plan for all single seals. A mechanical seal is simply a method of containing fluid within a vessel typically pumps, mixers, etc.
As a comprehensive manufacturer of pumps, torishima has never lost sight of the importance of. Between the two faces of the mechanical seal the secondary seals, known as shaft and insert mountings, like orings, wedges and vrings are inserted. October 20 105 to the mechanical seal and circulation of the buffer fluid is achieved by an internal circulating device pumping ring within the mechanical seal. High salt concentration complex assemblies single cartridge seal, axial spring seals. 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. Loosely inserted seal face provides selfadjusting capability. These technologically advanced products assist our customers in. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. The vapor space above the buffer fluid in the reservoir is vented to atmospheric pressure typically via a flare or vapor recovery system.
Increase seal chamber pressure and fluid vapor margin. 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. Basics concepts of operation, maintenance, and troubleshooting, part i. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. Clean, nonpolymerizing fluids at moderate temperatures. Mechanical seals are usually endface seals or rotatingface seals, but in some designs they can be circumferential or even a hybrid of liptype seals. We offer a wide selection of head types and mating ring. The btar owes its success to the wide range of application, the short axial length this allows for more economic pump construction and saves material, and the best qualityprice ratio.
Torishimas mechanical seals 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. For years, conventional mechanical seals have been used in applications where, often due to cost, cartridge seals were prohibitive. In every pump, the mechanical seal is one of the most important components. Seal type the mechanical seal shown in the pump photograph is a type 1 mechanical seal. Probably the most widely recognized and also most common mechanical seal used in general service, low pressure applications. Need for seals seal is a device for closing a gap or making a joint fluid tight liquid or gas need to minimize leakage to prevent toxic fluids escaping to atmosphere to reduce power loss. Sometimes operating conditions change to become quite different from the specific conditions for which the seal was intended. Mechanical shaft seals this section briefly describes the design and elements of the mechanical shaft seal.
The most appropriate mechanical seal design is the hygienic one which reduces. Mechanical seals for pumps how mechanical seals work. The seals are designed for universal use and fit perfectly into the installation spaces standardised in the chemical industry, e. Jacketed seal chambers are available for controlling the temperature of the mechanical seals environment and maximizing seal life. The single mechanical seal is perfectly suitable for fluids with a high solids content.
Sarbs pump maintenance seminar, june 7, 2012 factors influencing leakage seal face condition runningin process process influences stability of seal face condition of the secondary seals face deformation caused by temperature and pressure vibration and stability of the machine operating mode of the plant characteristics of the sealed fluids. Figure 1 shows a typical centrifugal pump, which highlights its constituent parts, including the mechanical seal. Mechanical seal products and services catalog flowserve. Mechanical seal for largeseries cold water pumps, produced in millions of units per year. Mechanical seals mechanical seals for pumps pusher seals. This type of mechanical seal can be used regardless of direction of rotation, this is because the acting torque is not transmitted through the coils. Increase your ability to specify seals to improve mechanical seal reliability mechanical seals for pumps. 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. Sealplus mechanical seals goulds pumps pdf catalogs. 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. Plan 11 used in applications with suspended solids where the sg of the particles are 2x that of the liquid. Goulds seal plus sp1 and sp2 are changing all that. Seal chamber pressure is greater than suction pressure.
The chapter describes mechanical shaft seals used in grundfos pumps as examples of the variety of shaft seal solutions for different. 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. The materials of seal construction, particularly the sealing faces and elastomers. The hardware of the mechanical seals like gland and compression ring, springs, pins, bellows etc. Mechanical seal design protects submersible pumps from abrasive wastewater customized seals made from superior materials can help prevent premature failure in heavyduty applications. The mechanical seal is the pump component exposed to the most intensive wear. 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. Text headings in each module are linked to and f\ rom the table of contents for that module. Typically mechanical seals are installed on pumps and mixers. Combined with a single ksb 4hl mechanical seal this is an optimum sealing solution for demanding fluids. As previously stated, a pump with a throughshaft is not leakproof. With our free email newsletter excellence in practice, you will receive firsthand information about current products, services, references and worthwhile industry insights. The mechanical seal type series 5kscb2 is available as single cartridge seal, single cartridge seal in quench design and double cartridge seal.
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