option or any variations to this standard are offered. A high oil level switch will trip an alarm and the pumpÂ is shut down. Type A is a balanced, cartridge mounted seal which utilized elas-tomeric secondary seals. If the incorrect mechanical seal is selected there are chances that the fluid would start leaking from the pump and the very purpose of installing the expensive mechanical seal will be destroyed. API 682 Category 2 and 3, Type A, Arrangement 2 seal; Dual seal in face-to-back arrangement; Dry contact outer seal (containment seal) Balanced; Cartridge unit; Stationary multiple springs; Solid seal faces The decision to choose between a double or single seal comes down to the initial cost to purchase the seal vs. the cost of operation, maintenance and downtime caused by the seal, plus the environmental and user plant emission standards for leakage from the seal.Singl mechanical seals Â has following two subcategories: The single inside-mounted seal is the most common in the industry and the most energy-efficient as compared with other sealing methods, such as packing and sealless equipment. When selecting the mechanical seal for any applications consider the following factors: 1) Liquid or fluid to be pumped: The first and the most important factor to consider while selecting the mechanical seal for the centrifugal pump is the liquid or the fluid to be pumped. Springs 5. Primary sealing ring and mating ring. To address these situations, the seal industry has developed configurations which incorporate two sets of sealing faces, with a clean barrier fluid injected between these two sets of seal faces. Shaft mounted and cartridge, balanced and unbalanced, pusher and non-pusher, single and multiple, etc., etc. Some of the types of mechanical seals available include: Gaskets; O-rings; Bellow seals; Cartridge seals; Labyrinth seals; Radial shaft seals; Axial shaft seals; The following sections provide a brief description of each of the above-mentioned types. 63 Type 1B Dimensional Data (inches) Type 1B Dimensional Data (inches) Seal Size/D1 (inches) D2 D3 D4 L3 L65 1.000 0.875 1.500 1.750 1.875 0.343 The lubricating film is generated by the barrier fluid. The pusher types of mechanical seals are used commonly, are less expensive and are easily available in the market in wide range of sizes and designs. These types of fluids usually cause more wear and tear of the parts of the mechanical seals and in such cases it is advisable to use double seals. Improper installation of mechanical seal can also is the major cause of failure. Mating ring 3. This makes the seal less dependent on the fluid properties of the process fluid in the seal chamber. Dry gas seals are non-contacting, dry-running mechanical face seals that consist of a mating (rotating) ring and a primary (stationary) ring. EagleBurgmann mechanical seal type H75A4-T. (API seal type A, rotating). The gasket mounted on the seal ring pushed by the spring or bellow (usually the rotary ring) has to follow the movement of the ring induced by Spread throughout the world, this type of mechanical seal has reached an unsurpassed quali-ty level. A video about mechanical seals from the Garlock family of companies. The design, arrangement and materials of construction are essentially determined by the pressure, temperature, speed of rotation and product being sealed (the product media). 11 Shaft seal: Two mechanical seals in back-to-back arrangement In the case of "back-to-back" arrangements, a barrier fluid is fed into the space between the two mechanical seals. Copyright Â© 2020 Bright Hub PM. The functional categories of a mechanical seal are: 1. Choosing the correct materials for the hazardous liquids is very important else there will all the chances that the materials would fail and the liquid would leak to the atmosphere. In the sealing technology of EKATO, single-acting, double-acting, and triple-acting mechanical seals are used. Proposals for Disposal of Nuclear Reactor Radioactive Waste, Marine Fuel Management System: What these systems are & its Benefits. Seal ring (sometimes called primary ring) 2. 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. Seal chamber venting on horizontal pumps. The cartridge seal is an arrangement of seal components on a shaft sleeve and in a seal gland constituting a single unit that is usually assembled and pre-set at the factory. In addition there would be loss of time, manpower, resources and also some safety hazards. Face to face. Gaskets. A mechanical seal is a device that helps join systems or mechanisms together by preventing leakage (e.g. This arrangement is commonly found in the chemical industry. 5) Safety and Environmental concerns: The safety of human being handling the pump is of prime importance so are the permissible emission standards. Cartridge seal units offer major maintenance advantages. EagleBurgmann mechanical seal type LL9DTUU. Type B is a cartridge mounted seal which utilizes the flexible metal bellows and elastomeric sec-ondary seals. If the pump has to handle corrosive liquids like acids, it is very important to select corrosion resistant materials for the mechanical seals. Learn more about the strengths of each. However, these seals can operate only under low pressure range and if the force of the fluid exceeds certain limits the lubricating film between the faces squeezes out and the seal fails. Classification of mechanical seals by arrangement . A further distinctive feature is the type of seal lubricant. Identification of the exact liquid to be handled is the first step in seal selection. This product offers solid protection against solid and liquid contaminants and protection against lubricant leaks. But you can always see the water dripping from the pumps using ordinary glands. All Rights Reserved. The materials and mating surfaces used in mechanical seals should be able to sustain the temperature of the fluid. It is very important to use appropriate mechanical seal for the required application. This articles describes some of the commonly used mechanical seal types like Cartridge type mechanical seals, Balanced type, Unbalanced type, Conventional, Pusher, and Non-Pusher type of mechanical seals. There are various types and arrangement of the mechanical seals being used for the centrifugal pumps. THE DESIGN . Learn about our mechanical seal lubrication systems today. • Here we will examine the basic differences without going into a great detail. 3) Temperature of the liquid: Some pumps handle liquids at high temperatures and others handle the liquids at low temperature. Some of these materials can be stainless steel, bronze or hastelloy. Often several sealing options will be available: packings, lip seals, and various types of mechanical seals – single, double and tandem including cartridge seals. in a pumping system), containing pressure, or excluding contamination. A stationary seal may also be referred to as 'packing'. Fig. This helps reducing errors associated with seal setting and eventually also reduces the maintenance required. Double mechanical seals can be arranged in several configurations: Back-to-Back, Tandem, and Face-to-Face. As a result of the lower face loading, there is more even lubrication of the seal faces and longer seal life. The mechanical seal acts as a check valve and a slider bearing. These are relatively simple mechanical seals that have to be properly set and aligned on the shaft or the sleeve of the pump. This can be very dangerous to the people moving around the pumps and also to the atmosphere. 4) Nature of fluid: The liquids to be handled by the pump may be having ordinary flow, but there can also be chemical solutions that have high viscosity and slow flow, there can be precipitates, there can be abrasive liquids and so on. The barrier fluid is circulated by the centrifugal force effect of a pumping ring in theÂ seal. These mechanical seals are inexpensive, allow lesser leakage of the fluid and are highly stable. The total pressure on the seal decides whether one should opt for the balanced seal or the unbalanced type of seal. © Copyright 2013-2018 All Rights Reserved. Both bellows and spring-type seals can be cartridge-arranged if the pump stuffing box is large enough. D2 MAX. There are two types of mechanical seals: • single mechanical seals • double mechanical seals Mechanical seals consist of two surfaces which slide against each other The surfaces are pressed together by a spring. To be on the safer side it is always better to used double seals that work as the better sealants and are more reliable. The effectiveness of a seal is dependent on adhesion in the case of sealants and compression in the case of gaskets. There are various types and arrangements of the mechanical seals available in the market. Seal arrangements: Seal arrangements are based on a variety of criteria; the most common are summarized below. These definitions are carried over the previous editions. Design By way of example, a simple mechanical seal design has 7 components … The article also … BORE D3 SEAL OD 0.125" 20° For ease of installation, the lead-in edge of shaft or sleeve should be chamfered as shown. (API seal type A, rotating). The design, arrangement and materials of construction are essentially determined by the pressure, temperature, speed of rotation and product being sealed (the product media). Both inboard and outboard seals prevent the loss of neutral lubricating liquid.The inner seal prevents the circulated fluid to enter the system and the outer seal prevents it from leaking it to atmosphere.The circulation of the fluid reuces the heat generated on the seal faces.This seals are available in different design combination suiting to service conditions. D4 MIN. Some of the commonly used ones are described below: The pusher type of mechanical seals move axially along the rotating shaft or the sleeve to maintain the contact with the faces of the seal. The inboard seal keeps the liquid being pumped from entering the seal chamber. Arrangement 3 seals are defined as two mechanical seals with the barrier fluid between the seals maintained at a pressure higher than the seal chamber pressure (Figure 4). The process liquid is piped out from the of the reservoir into a safeÂ disposal area. Type 1B Typical Arrangement L3 ±0.031" L65 D1 ±0.002" SHAFT DIA. Why Seal chamber heat removal. Fig. EKATO is one of the pioneers in the use of mechanical seals in agitators and continue to produce them today. A tandem mechanical seal arrangement is also a combination of two seals but they are mounted in the normal position, as opposed to the back-to- back positionÂ of a double seal. The remaining components are referred to as hardware. All mechanical seals (49) 4AP (Amaprop) Single mechanical seal, bi-directional, tailored to the seal installation space and the submersible mixer‘s requirements. These seals are easily modified to accommodate seal flush plans and can be balanced to withstand high seal environment pressures. Where General applications with clean fluids. The neutral liquid, at a pressure higher than that of the liquid being pumped, lubricates the seal faces. There are many types of mechanical seal, ranging from simple single spring designs to considerably more complex cartridge seal types. The major advantage of the cartridge seals is that they donât require complicated setting during the installation as required by the conventional seal. external reservoir in a closed loop piping system but it is not pressurized. The seal can even be operated without any liquid in … If ordinary liquid like water is to be pumped, then conventional mechanical seal with ordinary materials can be selected. When operating, lifting geometry in the rotating ring generates a fluid-dynamic lifting force causing the stationary ring to separate and create a gap between the two rings. Mechanical Face Seal is also known as Heavy Duty Seal, Face Seal, Lifetime Seal, Floating Seal, Duo Cone Seal, Toric Seal, Mechanische Laufwerkdichtungen (German), Механични Челни Уплътнения (Bulgarian), Mechanike (Mechanike). 3. Two rotating seal rings are arranged facing away from each other. Hardware consisting mainly of spring and retainer. Mechanical seals and more. Since 1950, mechanical seals have been used in agitator technology. This is the most common type of mechanical seal. The bellows used in these seals should be upgraded so that they can work under the corrosive environments. aksialtætninger (Danish), Mekaaninen otsatiiviste (Finnish), articulated d 'Etanchéité Axiaux (French), Mechaniczne Uszczelnienie Czołowe (Polish), Juntas espejo … Metal parts must be corrosion resistant, usually plated steel, bronze, stainless steel, or Hastelloy. 10 %, and at least 2-3 bar, higher than the pressure of the fluid handled by … A barrier liquid is also injected between the two seals from anÂ SEAL TYPES • There are obviously many different types and configurations of mechanical seals. The seal type and arrangements chosen must meet the emission standards and desired reliability for the pump application. With inside seals, the fluid and pressure … In fact in many water pumps ordinary glands are used as the sealants since any leakage of water to the external atmosphere is not dangerous. The pressure in the stuffing box is higher than in the barrier chamber soÂ when the inner seal fails the process liquid enters the barrier chamber and forcesÂ the oil reservoir level to rise. single mechanical seal: The lubrication film needed between the slide faces is created by the medium to be sealed.. double mechanical seal: The lubrication film is created by the buffer medium.The buffer medium is under a higher pressure than the medium to be sealed. Stationary mechanical seal in inch dimensions. There are many types of mechanical seal, ranging from simple single spring designs to considerably more complex cartridge seal types. The mechanical seals also comprise of the mating surfaces and these should also be made up of corrosion and wear resistant materials like ceramic, silicon or tungsten carbide, carbon etc. Hardware The Design classification considers the details which enter into the features of these components. Balanced Seals and Unbalanced Seals. They are called secondary seals. Increase seal chamber pressure and fluid vapor margin. The unbalanced types of mechanical seals are used under drastic conditions where there are vibrations, misalignment of the shaft, and the problem of the cavitation of the fluid. 1 Mechanical end face seal arrangement. Mounted outside of stuffing box.Only corrosion resistant materials are in contact with product.Hydraulically balanced.Simple design â Assembled at factory â no installation measurements required â Just slide on shaft and contact stationary seal ring tighten screws and remove setting clips. 2) Pressure of the liquid: The liquid enters the pump at certain pressure and the pump has to increase its pressure to certain level so that it reaches certain height. HVAC: Heating, Ventilation & Air-Conditioning, Selection of the Mechanical Seal for the Centrifugal Pumps, Commercial Energy Usage: Learn about Emission Levels of Commercial Buildings, Time to Upgrade Your HVAC? Static air pressure test to 100 % production. In this arrangement, both the inner and outer seals are sealing the barrier fluid. As the name suggests, the non-pusher or bellow type of mechanical seals donât have to be moved axially to maintain their contact with the faces. The balanced mechanical seals have the ability to sustain higher pressures across the faces and they generate lesser heat thus they are suitable for handling liquids that have low lubricating capacity and hydrocarbons that have high vapor pressure. In general, these design features are not completely … Balanced mechanical seal arrangements refer to a system where the forces acting at the seal faces are balanced. HDDF metal seals are designed for use under severe operating conditions at relatively low circumferential speeds. All mechanical seals contain both rotating elements and stationary elements which include five basic components: 1. Each of these have described below in detail. There are two types of mechanical seals: Single seals do not always meet the shaft sealing requirements of todayâs pumps, due to the small amount of required leakage when handling toxic or hazardous liquids; suspended abrasives or corrosives in the pumpage getting between the seal faces and causing premature wear; and/or the potential for dry operation of the seal faces.
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