This is an internal recirculation from the pump discharge into the seal. External reservoir at pressure below seal chamber pressure providing buffer liquid forced circulation. Sep 20, 20 when would certain flush systems be better than others. 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. 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. 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. Traditional oils used in the industry include turbine oils and automatic transmission fluids. Plan 11 is the default seal flush plan for all single seals. To request a seal quote, please fill out this information sheet as complete as possible and return it to ppc. 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. Control of the seal chamber environment is severely limited.
Recirculation from pump discharge through a flow control orifice to the seal chamber. The seal ring which rotates with the shaft is called the rotary ring. Mechanical seal training course with working animation. Instead, the lubricating liquid will vaporize as it crosses the seal faces and the leakage is a gas or vapor. Mar 29, 2020 download mechanical seal piping plans book pdf free download link or read online here in pdf. In a plan54, a cool clean product from an external source. Common types of dual seals are addressed in another article. As mechanical seals can be used to seal a myriad of different.
The seal flush plan is as equally critical and perhaps more so to help establish a reliable operating mechanical seal. The chemical industry depends on john crane mechanical seals, seal support systems, and other engineered products for maximum reliability. The plan 53a is historically the most common method used to pressurize dual pressurized liquid sealing systems. Provides cooling for the seal without use of any external hardware or piping. Mechanical seals are usually endface seals or rotatingface seals, but in some designs they can be circumferential or even a hybrid of liptype seals. Search in john crane catalogs and technical brochures on directindustry and find the information you need in 1 click. Today, well identify 4 flush piping plans for single mechanical seals and how they work. Recommended for fluids which thicken at ambient temperature. Read online mechanical seal piping plans book pdf free download link book now. Single seals circulation between seal chamber and pump created by design. Mechanical seals are relied on to seal critical pumps in. Mechanical seals are often not viewed as a high priority in most plant. Eagleburgmann offers a wide range of high quality mechanical seals and supply systems which fully comply with api 682.
This plan provides an external barrier fluid which circulates from the seal to a reservoir and back to the seal. The seal and equipment on which the seal support system is being operated should be evaluated. These plans describe methods of controlling the environment around the seal, conditioning the sealed fluid, collecting and controlling seal leakage, and monitoring seal performance. Not recommended for dirty products as they will tend to clog the flushing line. 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. This site is like a library, you could find million book here by using search box in the. 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. Recirculation from pump discharge through a orifice to the seal. Vents air or vapors from the seal chamber in horizontal pumps. Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. Criteria for selection of mechanical seal flush plan. 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 single seals flush thru seal chamber thru orifice to suction. The seal chamber is not selfventing in vertical applications. Most common types of pump seal piping plans for single seals are discussed in following paragraphs. Eagleburgmann api piping plans overview process side between seals atmospheric side engineered. 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. Mechanical seal piping plans 4th edition product process dual liquid quench leak detection dual gas containment introduction and piping practices. The selection and design of dual pressurized liquid sealing. The mechanical seal division of the fsa is one of six with a speci. Used for applications where products have high pressure and are. Download mechanical seal piping plans book pdf free download link or read online here in pdf. 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.
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. Nov 06, 2012 mechanical seals piping plans api 628 1. Mechanical seal piping plans webinar session 3 siewert. Pdf mechanical seal piping plans world wide sealing. 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. Criteria for selection of mechanical seal flush plan design. Mechanical seals, seal support systems and more for the. Used in arrangement 2 seals to dilute process leakage andor lubricate seal faces. Several new piping plans were introduced in the second and third editions. Mechanical seal piping plans pdf book manual free download. Mechanical seal piping plans single seals dual seals plan 62 plan 65a plan 72 plan 74 plan 75 plan 76 fta157eng rev 1214.
The following pages illustrate and describe features of these plans as an. Why are there such a small amount of components for the gas seal system. 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. Selecting a seal flush piping plan for your single. With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. The following plans may be used for pressurized dual seal systems. Api standard 682 from the american petroleum institute provides various seal plan configurations, their advantages and disadvantages and. 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. Mechanical seal piping plans flowserve corporation. Integral internal recirculation is from pump discharge.
Plan 53aa pressurized gas blanket in the reservoir pressurizes the fluid. Plan 03 plan 65b plan 66a plan 66b what seal flush from pump discharge through orifice. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. This highquality booklet comprehensively describes both configurational parameters and application criteria. All books are in clear copy here, and all files are secure so dont worry about it. Recirculation from pump discharge through flow control orifice to the seal. Common types of pumps mechanical seal piping plans single. Product recirculation from pump discharge through a y strainer and a flow control orifice to seal chamber. Improvements in piping plans have made seal installations more reliable. Different types of pumps mechanical seal piping plans are detailed in api 682 or iso 21049 standards. Specialized applications engineered seal applications, not within the scope of api 682. Most common plans and sealing systems plan 53b plan 53c plan 52 used where the pumped product is.
The barrier fluid is pressurized by means of an externally supplied pressurization gas. Eagleburgmann range of balanced pusher and metal bellows mechanical seals acc. An api 682 guided seal selection tool is included along with details like seal. This system incorporates a liquid mechanical seal and utilizes pump discharge liquid as a flush for the seal. The selection and design of dual pressurized liquid. Chesterton mechanical seal support systems seal support systems for piping plans.
While some mechanical seal standard existed, they were generally buried in other. Scribd is the worlds largest social reading and publishing site. Oils are available in a wide range of types, compositions and viscosities. Please contact aesseal systems division for further details. This website uses cookies to ensure users have the best online experience.
Standard flush plans for mechanical seal plan 01 see figure 1. Use plant, company and industry lessons learned to properly select a flush system that will result in optimum seal life in your. Common types of pumps mechanical seal piping plans. Minimizes risk of freezing polymerizing of fluid in flush piping plans exposed to atmosphere. For the purposes of this discussion, consider that a mechanical seal will outperform common types of packing. Mechanical seal technology and selection eagleburgmann. To check out mechanical seal flushing arrangements and piping plans, i have consistently found this to be the most useful and permanent pocketsized document. Optional leakage management systems for arrangement 2 are plans 52, 71, 72, 75 and 76. The training course on mechanical seals covers the working, design, maintenance, installation and operation details. 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. Removes heat from the seal chamber as well as acting as a vent connection in horizontal pumps. Plan12 is used to protect orifice and seal face in. Few compatibility issues with mechanical seal materials exist. This is often foe thawing mechanical seal in freezing temperature before pump startup.
Advancements in mechanical sealing flowserve corporation. 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. Describes all sealing plans in most simplified manner. Unlike in plan 11, the flush is seldom directed over the seal faces.
Customer specific variants of these plans are possible. 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. With proper application and design however, the leakage is so minute that actual droplets of liquid are not detected. The flow of the flush fluid must be sufficient to remove the heat from the mechanical seal chamber. In a plan54, a cool clean product from an external source is supplied to the seal as a barrier fluid. Piping plans are a critical component in the successful design of a sealing system. Predicted leakage rates all mechanical seals require face lubrication to achieve reliability.