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. Springs 5. 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. The design, arrangement and materials of construction are essentially determined by the pressure, temperature, speed of rotation and product being sealed (the product media). The neutral liquid, at a pressure higher than that of the liquid being pumped, lubricates the seal faces. Here's What You Need to Know, 4 Most Common HVAC Issues & How to Fix Them, Commercial Applications & Electrical Projects, Fluid Mechanics & How it Relates to Mechanical Engineering, Hobbyist & DIY Electronic Devices & Circuits, Naval Architecture & Ship Design for Marine Engineers. The Type C Seal is a cartridge mounted high 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 seal can even be operated without any liquid in … The mechanical seal acts as a check valve and a slider bearing. Why Seal chamber heat removal. In this arrangement, both the inner and outer seals are sealing the barrier fluid. These seals are easily modified to accommodate seal flush plans and can be balanced to withstand high seal environment pressures. Double seals consist of two single seals back to back, with the primary rings facing in opposite directions in the seal chamber. The materials and mating surfaces used in mechanical seals should be able to sustain the temperature of the fluid. Type 1B Typical Arrangement L3 ±0.031" L65 D1 ±0.002" SHAFT DIA. 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. In addition there would be loss of time, manpower, resources and also some safety hazards. A stationary seal may also be referred to as 'packing'. Hardware consisting mainly of spring and retainer. Copyright © 2020 Bright Hub PM. With inside seals, the fluid and pressure … Dry gas seals are non-contacting, dry-running mechanical face seals that consist of a mating (rotating) ring and a primary (stationary) ring. 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. Classification of mechanical seals by arrangement . 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. 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. 10 %, and at least 2-3 bar, higher than the pressure of the fluid handled by … 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 Often several sealing options will be available: packings, lip seals, and various types of mechanical seals – single, double and tandem including cartridge seals. aksialtætninger (Danish), Mekaaninen otsatiiviste (Finnish), articulated d 'Etanchéité Axiaux (French), Mechaniczne Uszczelnienie Czołowe (Polish), Juntas espejo … They are used in all industries with respect to fluid types and their property ranges, pressure speed, diameter, and temperature. The process liquid is piped out from the of the reservoir into a safe disposal area. A barrier liquid is also injected between the two seals from an  EagleBurgmann mechanical seal type H75A4-T. (API seal type A, rotating). 3) Temperature of the liquid: Some pumps handle liquids at high temperatures and others handle the liquids at low temperature. A further distinctive feature is the type of seal lubricant. In the sealing technology of EKATO, single-acting, double-acting, and triple-acting mechanical seals are used. In general, these design features are not completely … 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  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. © Copyright 2013-2018 All Rights Reserved. Mounted outside of stuffing box.Only corrosion resistant materials are in contact with product.Hydraulically balanced.Simple design – Assembled at factory – no installation measurements required – Just slide on shaft and contact stationary seal ring tighten screws and remove setting clips. 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. Secondary seals consisting of O-rings or other suitable gaskets. Spread throughout the world, this type of mechanical seal has reached an unsurpassed quali-ty level. The article also … Shaft mounted and cartridge, balanced and unbalanced, pusher and non-pusher, single and multiple, etc., etc. This makes the seal less dependent on the fluid properties of the process fluid in the seal chamber. Seal arrangements: Seal arrangements are based on a variety of criteria; the most common are summarized below. THE DESIGN . Gas Seals Quench Seals www.flowserve.com Plan 03 Plan 65B Plan 66A Plan 66B What Seal flush from pump discharge through orifice. The bellows used in these seals should be upgraded so that they can work under the corrosive environments. Metal parts must be corrosion resistant, usually plated steel, bronze, stainless steel, or Hastelloy. 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. This arrangement is commonly found in the chemical industry. 1 Mechanical end face seal arrangement. This can be very dangerous to the people moving around the pumps and also to the atmosphere. There are many types of mechanical seal, ranging from simple single spring designs to considerably more complex cartridge seal types. It is very important to use appropriate mechanical seal for the required application. Both bellows and spring-type seals can be cartridge-arranged if the pump stuffing box is large enough. Where General applications with clean fluids. • Here we will examine the basic differences without going into a great detail. HDDF metal seals are designed for use under severe operating conditions at relatively low circumferential speeds. There are various types and arrangement of the mechanical seals being used for the centrifugal pumps. 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 position of a double seal. 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. The only disadvantage of these seals is that they tend to hang up and sometimes there is fretting of the shaft. Type A is a balanced, cartridge mounted seal which utilized elas-tomeric secondary seals. Some of these materials can be stainless steel, bronze or hastelloy. The remaining components are referred to as hardware. The effectiveness of a seal is dependent on adhesion in the case of sealants and compression in the case of gaskets. Seal ring (sometimes called primary ring) 2. These definitions are carried over the previous editions. As a result of the lower face loading, there is more even lubrication of the seal faces and longer seal life. Proposals for Disposal of Nuclear Reactor Radioactive Waste, Marine Fuel Management System: What these systems are & its Benefits. This product offers solid protection against solid and liquid contaminants and protection against lubricant leaks. 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. Learn more about the strengths of each. (API seal type A, rotating). Increase seal chamber pressure and fluid vapor margin. There are various types and arrangement of the mechanical seals being used for the centrifugal pumps. Static air pressure test to 100 % production. 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 total pressure on the seal decides whether one should opt for the balanced seal or the unbalanced type of seal. The major advantage of the cartridge seals is that they don’t require complicated setting during the installation as required by the conventional seal. Default single seal flush plan. 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. Balanced mechanical seal arrangements refer to a system where the forces acting at the seal faces are balanced. external reservoir in a closed loop piping system but it is not pressurized. Between these two surfaces a fluid film is generated by the pumped product. Stationary mechanical seal in inch dimensions. 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. In case of leakage, the barrier liquid penetrates the product. The elastic components of a mechanical seal (spring or bellow, gaskets) are of paramount importance for good performance. The mechanical seal acts as a check valve and a slider bearing. To be on the safer side it is always better to used double seals that work as the better sealants and are more reliable. 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. 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 Fig. SEAL TYPES • There are obviously many different types and configurations of mechanical seals. There are many types of mechanical seal, ranging from simple single spring designs to considerably more complex cartridge seal types. 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. The design, arrangement and materials of construction are essentially determined by the pressure, temperature, speed of rotation and product being sealed (the product media). Its pressure should be approx. 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. Further information shall be provided by the vendor if an. 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. Seal chamber venting on horizontal pumps. 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. EKATO is one of the pioneers in the use of mechanical seals in agitators and continue to produce them today. 5) Safety and Environmental concerns: The safety of human being handling the pump is of prime importance so are the permissible emission standards. 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 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). Fig. 3. The barrier fluid is circulated by the centrifugal force effect of a pumping ring in the seal. These seals can work under low temperature and high pressure applications. 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