Double mechanical seal arrangement options double seals. A mechanical seal that operates with gas as the lubricant. Mechanical seals and more 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. Mechanical seal piping plans flowserve corporation.
With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. Used for applications where products have high pressure and are. 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. When seals and their environmental controls are properly designed, installed and maintained, the results are well worth the effort in terms of safety, emissions, process efficiency, reduced materials and labor, and seal life. In a mechanical seal, the face that cannot move in the axial direction. Buy high quality and affordable burgmann mechanical seals via sales. How to set up a piping plan 62 steam quench flexaseal. Quench and thermosiphon systems, heat exchangers, buffer. Innerlynx are made from synthetic rubber with heavyduty uv and ozone resistant plastic pressure plates or all metal plates.
Seal in contact with the product or processin an arrangement 1, 2 or 3. Piping plans help keep mechanical seals running cool and clean, promote safe handling of dangerous fluids, and extend the operational availability of rotating equipment. Plan 65b plan 66a plan 66b what seal flush from pump discharge through orifice. 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. Simple plans can use the suction or discharge pressure of the pump to move fluid across the seal faces these plans will simply have piping with orifices leading from a port to the seal chamber. These reservoirbased seal support systems are designed for both api plan 52 and 53a applications to support unpressurized and pressurized dual seals. Pdf mechanical seal piping plans world wide sealing. The true cost of external seal flush piping plan 32. Since we are discussing the sealing of the liquid at the faces, lets take a look at the sealing points of a typical mechanical seal.
Mechanical seal ea111for refrigeratrion compressors. Instead, the lubricating liquid will vaporize as it crosses the seal faces and the leakage is a gas or vapor. The seal between the rotating 3 and stationary faces 1. Figure 1 shows a basic overview of what a 53b seal flush plan looks like. The seal between the rotating member and shaft or shaft sleeve 4. Describes all sealing plans in most simplified manner. This arrangement is recommended for relatively clear noncorrosive and corrosive pumping liquids, with satisfactory lubricating properties, where cost of operation does not exceed that of a double seal. Mechanical seal piping plans single seals plans 01, 02, 03, 11, 14, 21, 23, 31, 32, 41 dual seals plans 52, 53a, 53b, 53c, 54, 55 quench seals.
A large quantity of leaks of the inner seal detect it in lsh or psh of. Standard flush plans for mechanical seal plan 01 see figure 1. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. These seals virtually eliminate leakage of the fluid or gas being handled in pumps or mixers. It is used in services containing solids or contaminants such that the process stream is difficult to condition in a way that will provide adequate cooling and lubrication to the mechanical seal. Circulation of barrier fluid is normally achieved with a pumping ring or optional circulating pump, and a range of heat exchangers can be packaged with the system selection dependent on. Consequently, this mechanical seal can be operated without maintenance for a long period of time and are extremely effective, efficient, reliable and economical. Mechanical seals first in a series by ann attenasio. John crane composite mechanical seal prices are pretax. Again, viewing the same pump and seal, note that there are four sealing points to consider. External reservoir at pressure below seal chamber pressure providing buffer liquid forced circulation. Connecting to the discharge port will allow for the high pressure discharge fluid to travel to the seal chamber and reenter the process.
In the packingdriven system used to drive the rotating ring, the seal is clamped to the shaft by the tightening force of the packing. Like packing, the mechanical seal faces must also be lubricated. 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. Mechanical seals for pumps how mechanical seals work. Doing this created a series of lips with horizontal as well as vertical contact points. Water, oil, and chemical mediums with weak corrosion. In part 2, were taking a closer look at the various rotary and stationary double seal arrangement options configurations, and how to maximize their success. Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. Pr 52 and pr 53a wet seal systems john crane seal support. Compare prices on burgmann mechanical seals shop best value. The true cost of external seal flush piping plan 32 a change of mechanical seal flush plan improved the efficiency of the plant.
Plan 41 what seal flush from pump discharge through cyclone separator and cooler. Double seals provide a level of safetyzero emissions compliance not possible with single seals. May also be referred to as the inner seal in arrangements 2 and 3. Enjoy exclusive discounts and free global delivery on burgmann mechanical seals at aliexpress. Every centrifugal pump must accommodate a spinning shaft while mechanically maintaining fluid or gas contained in the wet end of the pump. Of course, the mechanical seal should be correctly and most optimally designed for the particular application at hand. Most common types of pump seal piping plans for single seals are discussed in following paragraphs. The performance of the seal is greatly influenced by the environment around the seal faces, making the provision of suitable, clean fluids as well as. You just need to make sure that a puff of steam is coming out from the bushing.
The seal between the stationary member 1 and stuffing box face, i. Common types of pumps mechanical seal piping plans. Innerlynx electrically isolate the inner carrier pipe from the penetrated structure. Today, well identify 4 flush piping plans for single mechanical seals and how they work. With proper application and design however, the leakage is so minute that actual droplets of liquid are not detected. Increase seal chamber pressure and fluid vapor margin. Pressure is needed only to fill this cavity and maintain that it is full of steam, a normal recommendation of 24 psi. These mechanical seal are a result of two decades of experience in design, manufacture and operation of seals. Sep 17, 2014 a mechanical seal has 4 main sealing points. These are standardized flushing piping arrangements that are widely used in. Plan single seals flush through seal chamber through orifice to suction. These seals often use two rotating seal faces and two stationary seal. The bellows can be constructed of metal, rubber or ptfe.
The initial closing force ensures that the seal will function properly from startup. Integral internal recirculation is from pump discharge to seal. In part 1 of our series on double dual seals, we discussed the benefits of dual seal design and when to use it. It is a pressurized flush plan that gets used with a dual seal i. Today, well identify 4 flush piping plans for single mechanical seals. What deadended seal chamber with recirculation from seal chamber. A seal in which the clearance between the shaft or rotating seal component and the nonrotating seal component is geometrically. Nov 06, 2012 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, 54 quench seals p. Vulcan type 24, burgmann mg912, john crane type 521, roten type 52 12 14 16 18. Mechanical seal design operating principles essential elements requirements fluid leakage effective forces power consumption lubrication seal balance classification application limits drive mechanisms loading devices mating ring types gland design oring, seal design oring, seal design oring, seal failure psp oring sizes. Secondary seal nbrepdmviton spring and punched parts steel working conditions mediums. I hereby certify that i am the \agent of\ owner of record and am authorized to make this\rapplication. Mechanical seals ekk technologies eagle industry co.
These are standardized flushing piping arrangements that are widely used in the industry. Dirty or contaminated fluids, water with sand or pipe slag. Internal structure of pump a pump is a machine that works to move fluids, as in lifting a liquid to its inside. Ppt understanding mechanical seals powerpoint presentation. 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. Where high temperature service, typically less than 177c 350f. Double or dual mechanical seals are designed to ensure maximum sealing safety.
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 consists primarily of a rotary seal face with a driving mechanism which rotates at the same speed as the pump shaft, a stationary seal. Mechanical seal installation location in pump a mechanical seal is installed on the impeller rotating shaft. Buffer gas can be used to dilute seal leakage or in conjunction with plan75 or 76 to help sweep leakage into a closed collection system.
Mechanical seal technology and selection eagleburgmann. What is a double seal and when to use one double seals. Selecting a seal flush piping plan for your single mechanical. The seal flush plan is as equally critical and perhaps more so to help establish a reliable operating mechanical seal. All orings are static and the seal components compensate for face wear without pushing any sealing points. To request a seal quote, please fill out this information sheet as complete as possible and return it to ppc. In end or rotatingface mechanical seal designs, the initial closing force is provided by a spring component, which can be a single coil spring, multiple coil back to basics. The dilution effects of a plan 32 flush had an impact on the efficiency of downstream evaporator plant. 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. 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.
Plan 53b dual seals, pressurized liquid barrier through heat exchanger. Mechanical seals piping plans api 628 linkedin slideshare. The dynamic sealing surface was incorporated into the seal assembly. By using an alternate seal arrangement the flush was no longer necessary. Customer specific variants of these plans are possible. Common types of dual seals are addressed in another article. What deadended seal chamber with recirculation from seal chamber no flush. 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. These seal are best suitable for application involving abrasive, corrosive and viscous fluids. This integral system was a technological advance that allowed manufacturers to take responsibility for the entire sealing system and not just the seal. Certification in lieu of oath licensed contractor exempt applicant. Basics of fluid pump sealing a mechanical seal is simply a method of containing fluid within a vessel typically pumps, mixers, etc. Plan75 is used on arrangement2 which utilize a drycontainment seal and where the leakage from the inner seal may condense. The api seal plans elaborated in this section are as defined by api 682 4th edition api 610 10th edition.
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