Mechanical seals for pumps how mechanical seals work. The operator must be aware of the pumpage and take appropriate safety precautions to. Installation,operation, andmaintenancemanual goulds pumps. Types of mechanical seals 2 installation of mechanical seal 3 inspection of seal components prior to installation 5. Spring provides positive pressure for sealing between the sealing faces. 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. To install a seal, the pump would have to be taken. Introduction and safety 6 model 3196 iframe installation, operation, and maintenance manual safety warning. Different types of mechanical seal pump heat transfer scribd. Api 682 most common plans and sealing systems castle pumps. Type 28vl noncontacting gas seal for vaporizing liquids. A seal with a thick lubrication film suffers virtually no wear, since the film takes up most of the load from the closing. Single mechanical seal this is the most common seal type used which is a seal used to seal the pump head, ensuring the liquid is retained within the pump head and does not leak out via the back of the pump casing where entry is made via the shaft which is driven by a motor.
This article will explain what a mechanical seal is and the key design features that make them work. There are many different designs of a mechanical seal to meet specific applications. The 180 compact chassis is designed to fit ansi and api610 pumps. Probably the most widely recognized and also most common mechanical seal used in general service, low pressure applications. Mechanical seal piping plans single seals dual seals plan 62 plan 65a plan 72 plan 74 plan 75 plan 76 fta157eng rev 1214 experience in motion 2014 flowserve corporation gas seals quench seals. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. Design single mechanical seal type dynamic, balanced operating pressure up to 25 bar dynamic up to 37. H and l types are typically singlespring seals, while the m types are multispring. Flowserve offers split seals for applications where downtime and equipment disassembly are critical. Mechanical seals come in a wide variety of designs and materials for nearly every application.
The btrn represents the traditionally designed robust pusher seal. Mechanical pump seals project standards and specifications page 3 of 17 rev. The most appropriate mechanical seal design is the hygienic. Mechanical seals according to en 12756 code system for single mechanical seals there is a distinction drawn between standard n and short k types. The twostages are arranged backtoback in order to reduce the axial load to the bearings. Pumps available for electric motor, natural gas or diesel engine driven design. Mechanical seal working animation types of mechanical seal. A compact unitized single spring elastomeric bellows shaft seal. Symbols a area of sliding face a h area hydraulically loaded by medium pressure b width of sliding face. For both pump types the same sealing concept was selected. This type of mechanical seal is easy to install and covers a wide range of applications.
Various seal arrangements and types that better suit our specific needs are available. Within this scope, not only is it important to locate spare parts to make. Measure the inside diameter of the bellows dimension a. Figure 1 typical high pressure, high temperature process pump introduction mechanical seals vs. The chesterton mechanical seal catalog is a starter reference source to help users identify standard. General 2000process 3000marine 4000 submersible pump submersible bearing hydraulic standard seal turbine 5000 6000 7000vessel 8000process 9000special nbr sdss sus329j4l sus329j1 sus403 sus304 sus316 sus316l carpenter 20 hastelloy worthite. Copper seal flush lines from pump casing to seal chamber. Mechanical pump seals project standards and specifications table of content scope 2 introduction 2 types of mechanical seals 2 installation of mechanical seal 3 inspection of seal components prior to installation 5 fixing of mechanical seal 6. The emphasis is on reducing maintenance costs, as the settings are relatively simple. Type rs2 seal are more specified by ocm than pump manufacturer. Drive magnets outer align with driven magnets inner and use magnetic force to turn the shaft through a static containment shell canister. 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 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.
Pumps installed on ships must be extremely reliable and durable. No mechanical seal capable of handling applications with wide ranges of viscosities better than average tolerance for running dry. The seal between the stationary member 1 and stuffing box face, i. These seals types require setting and alignmentof the seal single, double, tandem on the shaft or sleeve of the pump. Balanced mechanical seals for working pressures in excess of 400psi. M pumps process srl via dellartigianato, 120 45015 corbola ro italia tel. Centrifugal pump definition centrifugal pump can be defined as a mechanical device used to transfer liquid of various types. The seal between the rotating 3 and stationary faces 1.
Factory option seals are of high quality and supplied by leading mechanical seal manufacturers. There are many types of mechanical seal, ranging from simple single spring. The 180 compact chassis is designed to fit ansi and api610. 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. Mechanical seal technology and selection eagleburgmann. It is a convenient solution for the widest range of applications. As the name suggests, it relies on the principal of centrifugal force. Mag drive pumps are a truly sealless design which ensures zero leakage of liquid or. Epdm, neoprene, nitrile, chemraz, kalrez, and viton are available. Seal types d and e 350 psi seal type w and x 350 psi elastomeric temperature limits. Offer designs which can be easily replaced or repaired like lip seals, can catastrophically fail higher end double cartridge seals and gas barrier seals are quite expensive and require external support equipment. Utilizing proven spiral groove technology, the type 28vl harnesses the rotational energy of the pump shaft to vaporize the process fluid at a controlled rate, creating a stable gas film that lubricates the seal faces. Seal type the mechanical seal shown in the pump photograph is a type 1 mechanical seal.
Typically mechanical seals are installed on pumps and mixers. A mag drive pump is a sealless pump that utilizes a magnetic coupling to create a static shaft seal. Seal heads type k, r and t identify seal head type determine shaft size. Mechanical seals are used in industrial pumps, compressors, and other applications to provide a leakproof seal between component parts. There are various types and arrangement of the mechanical seals being used for the centrifugal pumps. Centrifugal pump mechanical design, analysis, and testing. Pumps available in clockwise and counterclockwise rotation based upon application. A seal with a thick lubrication film suffers virtually no wear, since the film takes up most of.
The externally mounted mechanical seal on alfa laval pump ranges is also available as a double flushed mechanical seal for some pump models. The seal consists of several parts involving a rotating assembly which rotates as the shaft rotates, a stationary part which is fixed and is cooled by the liquid being pumped, and a spring to ensure the seal remains. Series scii horizontal split case pumps federal pump. Guidelines for selection, application and operation is intended to assist in understanding the general layout, components, and operation of a typical water treatment plant, and provide the guidance necessary to select pump types and define pump materials to perform effectively, efficiently, and reliably in the. Mechanical seals with diamondface technology used in. At utex, we refer to this type as rs1 the assembly shown in the pump is configured with a.
Figure 1 shows a typical centrifugal pump, which highlights its constituent parts, including the mechanical 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. Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps. Available with bare shaft or monoblock configuration, with the engine directly keyed to the pump support. It converts the energy provided by a prime mover, such as an electric motor, steam turbine, or gasoline engine, to energy. Type 2 seal fits with limited seal chamber depth and fits in minimum space. This is important for all pumps and in the case of centrifugal pumps several sealing options will be available. Ksb mechanical seals for water and waste water applications. Spring retainer positions and centers the spring, aiding the concentricity between the spring and shaft. Cartridge seals lower maintenance costs and reduceseal setting errors. Centrifugal pumps develop pressure by increasing the velocity of the liquid liquid is literally flung out of the cutwater. It converts the energy provided by a prime mover, such as an electric motor, steam turbine, or. Mechanical seal products and services catalog flowserve.
Positive displacement pumps allow liquid to flow into an open cavity trap the liquid in the pump transport liquid from the suction to discharge port mechanically force liquid out of the pump. For double mechanical seals backtoback en specifies the short type only. Pumps of this type are called double volute pumps they may also be referred to a split volute pumps. In this type of seal often there are no metallic parts in contact with the product or, if. Mechanical seals are relied on to seal critical pumps in. Plan 03 plan 65b plan 66a plan 66b what seal flush from pump discharge through orifice. Centrifugal pump mechanical design, analysis, and testing author. Single cartridge seals will operate within roughly the same physical parameters as component positivedrive mechanical seals.
The seal between the rotating member and shaft or shaft sleeve 4. Useful information on pump shaft seals what is a pump shaft seal. The typical single, single flushed and double flushed mechanical seal arrangements are described as follows. Shaft seals prevent liquid escaping from a rotating or reciprocating shaft. They can ha viscosities to 7,700 cst 35,000 ssu, pressures to 300 psi 20 bar, and temperatures to 400f. The pss iii is a split seal for pumps that provides an ease of installation unmatched in the industry. The pumps described in this manual have the following features.
Different types of mechanical seal free download as pdf file. This articles describes some of the commonly used mechanical seal types like cartridge type mechanical seals, balanced type, unbalanced type, conventional, pusher, and nonpusher type of mechanical seals. The seal consists of several parts involving a rotating assembly which rotates as the shaft rotates, a stationary part which is fixed and is cooled by the liquid being pumped, and a spring to ensure the seal. A mechanical seal is simply a method of containing fluid within a vessel typically pumps, mixers, etc. Centrifugal pumps can also be constructed in a manner that results in two distinct volutes, each receiving the liquid that is discharged from a 180.
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