Common types of dual seals are addressed in another article. A quench stream is brought from an external source to. 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. Plan 53aa pressurized gas blanket in the reservoir pressurizes the fluid. Use plant, company and industry lessons learned to properly select a flush system that will result in optimum seal life in your. This system incorporates a liquid mechanical seal and utilizes pump discharge liquid as a flush for the seal. 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. 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. Piping plans help keep mechanical seals running cool and clean, promote safe handling of dangerous fluids, and extend the operational availability of rotating equipment. This will dilute the process product as seal water is introduced into the system, but many times that is acceptable. External reservoir at pressure below seal chamber pressure providing buffer liquid forced circulation. Predicted leakage rates all mechanical seals require face lubrication to achieve reliability. Environmental control plans 3 plan 12 discharge recirculation with strainer n use with single seal n cools seal n increases pressure in seal chamber throat bushing optional n clean fluids only solids can erode seal solids can clog seal when bushing is used n an orifice can be used to reduce flow and pressure plan suction.
Traditional oils used in the industry include turbine oils and automatic transmission fluids. With proper application and design however, the leakage is so minute that actual droplets of liquid are not detected. Mechanical seals are often not viewed as a high priority in most plant. While some mechanical seal standard existed, they were generally buried in other. It is necessary that one has to preselect mechanical seal and flush system design during the prefeed project phase, based on plant, company andor industry experience, to optimize mechanical seal mtbf. This highquality booklet comprehensively describes both configurational parameters and application criteria. Why are there such a small amount of components for the gas seal system. Eagleburgmann range of balanced pusher and metal bellows mechanical seals acc. Nov 06, 2012 mechanical seals piping plans api 628 1. The seal chamber is not selfventing in vertical applications. This site is like a library, you could find million book here by using search box in the. Mechanical seal piping plans single seals dual seals plan 62 plan 65a plan 72 plan 74 plan 75 plan 76 fta157eng rev 1214.
The training course on mechanical seals covers the working, design, maintenance, installation and operation details. Common types of pumps mechanical seal piping plans. Product recirculation from pump discharge through a y strainer and a flow control orifice to seal chamber. Customer specific variants of these plans are possible. Unlike in plan 11, the flush is seldom directed over the seal faces. Selecting a seal flush piping plan for your single. A sealing system, consisting of a mechanical seal and an associated supply system that is balanced by individual applications, is the utmost guarantee for a reliable sealing point and uninterrupted pump service. All books are in clear copy here, and all files are secure so dont worry about it. Mechanical seals are usually endface seals or rotatingface seals, but in some designs they can be circumferential or even a hybrid of liptype seals. The seal and equipment on which the seal support system is being operated should be evaluated. A few simple principles can guide you to the best seal flush plan for your installed mechanical seal, allowing the seal to operate in an environment that generates optimal seal life yet minimizes costs from water usage and product dilution. Mechanical seals are relied on to seal critical pumps in.
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. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. Used in arrangement 2 seals to dilute process leakage andor lubricate seal faces. The following pages illustrate and describe features of these plans as an. Piping plans are a critical component in the successful design of a sealing system. Improvements in piping plans have made seal installations more reliable.
Common types of pumps mechanical seal piping plans single. Mechanical seals, seal support systems and more for the. Integral internal recirculation is from pump discharge. Mechanical seal pl pl ng plans piping plan 12 discharge recirculation with strainer piping plan 32 clean flush piping plan 538 closed loop with heat exchanger and accumulator use with single seal cools seal increases pressure in seal chamberthroat bushing optional clean fluids onlysolids ccm erode sealsolids can dog seal when. This best practice has been used since the mid1970s, from the time that prohibiting the use of flush line strainers and cyclone separators has resulted in optimum mechanical seal safety and reliability during field mechanical. Read online mechanical seal piping plans book pdf free download link book now. Most common plans and sealing systems plan 53b plan 53c plan 52 used where the pumped product is. Recirculation from pump discharge through flow control orifice to the seal. Mechanical seal training course with working animation. Criteria for selection of mechanical seal flush plan design. Mechanical seal piping plans single seals plans 01, 02, 11, 14, 21, 23, 31, 32, 41 dual seals plans 52, 53 a, 53 b, 53 c. Recirculation from pump discharge through a orifice to the seal. Mechanical seals are simply another means of controlling leakage of a process where other means are deemed to be less capable of performing the task adequately.
To check out mechanical seal flushing arrangements and piping plans, i have consistently found this to be the most useful and permanent pocketsized document. Different types of pumps mechanical seal piping plans are detailed in api 682 or iso 21049 standards. Mechanical seal piping plans 4th edition product process dual liquid quench leak detection dual gas containment introduction and piping practices. Most common types of pump seal piping plans for single seals are discussed in following paragraphs. Api standard 682 from the american petroleum institute provides various seal plan configurations, their advantages and disadvantages and a good description of each of the plans. Vents air or vapors from the seal chamber in horizontal pumps. Optional leakage management systems for arrangement 2 are plans 52, 71, 72, 75 and 76. Mechanical seal technology and selection eagleburgmann.
The flow of the flush fluid must be sufficient to remove the heat from the mechanical seal chamber. Api standard 682 from the american petroleum institute provides various seal plan configurations, their advantages and disadvantages and. Most common plans and sealing systems plan 53b plan 53c plan 52 used where the pumped product is harmful hazardous and or buffer fluid may not contaminate the product. The plan 53a is historically the most common method used to pressurize dual pressurized liquid sealing systems. In a plan54, a cool clean product from an external source is supplied to the seal as a barrier fluid. This is often foe thawing mechanical seal in freezing temperature before pump startup. Plan12 is used to protect orifice and seal face in.
Api piping plans help to ensure good conditions for mechanical seal operation as well as improving safety and pump reliability. Please contact aesseal systems division for further details. Minimizes risk of freezing polymerizing of fluid in flush piping plans exposed to atmosphere. An api 682 guided seal selection tool is included along with details like seal. For the purposes of this discussion, consider that a mechanical seal will outperform common types of packing. Eagleburgmann offers a wide range of high quality mechanical seals and supply systems which fully comply with api 682. When you have specialized fluids that should not leak to the atmosphere or will not permit dilution with seal water, a double mechanical seal will be required and the flush plan will act as a miniature loop of barrier or buffer. Search in john crane catalogs and technical brochures on directindustry and find the information you need in 1 click. Mechanical seal piping plans webinar session 3 siewert. In a plan54, a cool clean product from an external source. This is an internal recirculation from the pump discharge into the seal. As mechanical seals can be used to seal a myriad of different. Provides cooling for the seal without use of any external hardware or piping. Standard flush plans for mechanical seal plan 01 see figure 1.
Download mechanical seal piping plans book pdf free download link or read online here in pdf. John crane is an american company, now a subsidiary of smiths group and provider of engineered products and services including mechanical seals, couplings, seal support systems, filtration systems and artificial lift. Mechanical seal piping plans pdf book manual free download. Sep 20, 20 when would certain flush systems be better than others. Instrumentation on the piping plans historically, most seal piping plans were provided with local indicators and switches. The mechanical seal division of the fsa is one of six with a speci.
Specialized applications engineered seal applications, not within the scope of api 682. Few compatibility issues with mechanical seal materials exist. Used for applications where products have high pressure and are. These plans describe methods of controlling the environment around the seal, conditioning the sealed fluid, collecting and controlling seal leakage, and monitoring seal performance. The selection and design of dual pressurized liquid. Instead, the lubricating liquid will vaporize as it crosses the seal faces and the leakage is a gas or vapor. Advancements in mechanical sealing flowserve corporation. Chesterton mechanical seal support systems seal support systems for piping plans. The selection and design of dual pressurized liquid sealing. The following plans may be used for pressurized dual seal systems. Recirculation from pump discharge through a flow control orifice to the seal chamber. Recommended for fluids which thicken at ambient temperature. Mechanical seal piping plans flowserve corporation.
Criteria for selection of mechanical seal flush plan. Removes heat from the seal chamber as well as acting as a vent connection in horizontal pumps. Today, well identify 4 flush piping plans for single mechanical seals and how they work. Describes all sealing plans in most simplified manner. This website uses cookies to ensure users have the best online experience. Not recommended for dirty products as they will tend to clog the flushing line. The barrier fluid is pressurized by means of an externally supplied pressurization gas. Several new piping plans were introduced in the second and third editions. Plan 11 is the default seal flush plan for all single seals. Eagleburgmann api piping plans overview process side between seals atmospheric side engineered. The seal flush plan is as equally critical and perhaps more so to help establish a reliable operating mechanical seal. Apiplans all plans 4mb plan 01 plan 0203 plan 11 plan plan 14 plan 21 plan 23 plan 31 plan 32 plan 41 plan 52 plan 53a plan 53b plan 53c plan 5455 plan 62 plan 65a plan 65b plan 66ab plan 72 plan 74 plan.
The seal ring which rotates with the shaft is called the rotary ring. Scribd is the worlds largest social reading and publishing site. Control of the seal chamber environment is severely limited. Oils are available in a wide range of types, compositions and viscosities. Mar 29, 2020 download mechanical seal piping plans book pdf free download link or read online here in pdf. Pdf mechanical seal piping plans world wide sealing.
The chemical industry depends on john crane mechanical seals, seal support systems, and other engineered products for maximum reliability. Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. Single seals circulation between seal chamber and pump created by design. Plan single seals flush thru seal chamber thru orifice to suction. Importance of piping plans introduction the key to maximizing mechanical seal reliability and minimizing total cost of ownership is in controlling the environment in and around the seal. This plan provides an external barrier fluid which circulates from the seal to a reservoir and back to the seal.
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