Increase seal chamber pressure and fluid vapor margin. Plan 11 is the default seal flush plan for all single seals. Plan12 is used to protect orifice and seal face in. The api plans elaborated in this section are as defined by api 682 3rd edition api 610 10th edition. In the international mechanical seal standard api 682 iso 21049, third edition, 2004, the american petroleum institute api recognizes three piping plans, plan numbers 53a, 53b and 53c, that utilize. The mechanical seal division of the fsa is one of six with a speci. A throat bushing isolates the cooled seal chamber flush fluid from the hotter pumped liquid. Mechanical seals piping plans api 628 free download as powerpoint presentation. Introduction to failures failure of the mechanical shaft seal is the most common cause of pump downtime. Api plans mechanical seal manufacturers in mumbai india. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal.
Recommended for fluids which thicken at ambient temperature. Mechanical seals are used in millions of process pumps. This task force was comprised of fourteen members from various refineries, seal and pump manufacturers. Api seal flush plan 32 bk19702 mechanical 5 oct 11 09. Different types of pumps mechanical seal piping plans are detailed in api 682 or iso 21049 standards. Whystandard flush plan in hot water seal chamber heat removal. The barrier liquid is circulated to and from the seal chamber via a pump located on an external reservoir. Api plan 11 description product recirculation from pump discharge to seal through a flow control orifice. This is obvious since this is the purpose of providing the piping plan in the first place.
A quench stream is brought from an external source to. Api piping plan since the rotating seal will create heat from friction, this heat will need to be removed from the seal chamber or else the seal will overheat and fail. Product recirculation from pump discharge to seal through a flow control orifice. Common types of pumps mechanical seal piping plans single. Annex g normative standard piping plans and auxiliary hardware. The selection and design of dual pressurized liquid sealing. Although the 1st through 7th editions of api 610 included specifications for mechanical seals, beginning with the 8th edition, api 610 defers to api 682 for seal specifications. Learn more about double seal setup and operation in our upcoming posts. It includes a strong set of defaults and is by far the best and most logical starting point for mechanical seal and systems use. Acts as an internal flushing line for the mechanical seal. Prevents product from vaporizing by maintaining positive pressure above vapour pressure. Removes heat from the seal chamber as well as acting as a vent connection in horizontal pumps.
This is often foe thawing mechanical seal in freezing temperature before pump startup. External reservoir at pressure below seal chamber pressure providing buffer liquid forced circulation. 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. Equipment operators should take the time to familiarize themselves with api 682 to get the most out of this. Sealing systems for pumpssealing systems for pumps part i. Api plan 54 is a custom engineered system that delivers a pressurized barrier fluid to the seal chamber. The seal ring which rotates with the shaft is called the rotary ring. 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. An api plan is widely used in vertical pump applications or when seal chamber pressure is at or near discharge pressure of the pump. Goulds can also provide other special arrangements of user preference. Eagleburgmann mbs682 single metal bellows mechanical seal.
Api seal flush plan 32 mechanical seal engineering engtips. 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. The bottomline is that the double seal option is unmatched in terms of safety, leakemissionfree operation, and lifecycle cost llc. The plan 53a is historically the most common method used to pressurize dual pressurized liquid sealing systems.
Api 682 mechanical seal support plans introduced in 1994, api 682 has become the global standard for procurement and operation of seal and supply systems in the oil and gas section. Selecting a seal flush piping plan for your single. Eagleburgmann range of balanced pusher and metal bellows mechanical seals acc. 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.
Chesterton mechanical seal support systems seal support systems for piping plans. Doubledual mechanical seal arrangement options part 3. Please contact aesseal systems division for further details. 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 fluid is maintained at a pressure greater than.
These standards also describe the many flush plans piping plans used by modern industry. Today, well identify 4 flush piping plans for single mechanical seals and how they work. The selection and design of dual pressurized liquid. Api piping plans help to ensure good conditions for mechanical seal operation as well as improving safety and pump reliability. What is a double seal and when to use one double seals. Unlike automotive, home appliance and similar applications where it is common for. 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. Cpi plan 7353 pressurized circulation lubricates double seal faces.
Api 682 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. Used where the pumped product is harmful hazardous and or buffer fluid may not contaminate the product. Plan single seals flush thru seal chamber thru orifice to suction. Common types of dual seals are addressed in another article. In a plan54, a cool clean product from an external source is supplied to the seal as a barrier fluid.
Chemical john crane mechanical seals, seal support. The seal flush plan is as equally critical and perhaps more so to help establish a reliable operating mechanical seal. Customer specific variants of these plans are possible. The chesterton bss buffer support system provides nonpressurized. Eagleburgmann api piping plans overview process side between seals atmospheric side engineered. Failure causes at mechanical seal insufficientventingat li id gas ring liquid gas mixture insufficient venting at mechanical seal vaporization of media in seal gap liquid g negative pressure in stuffing box air bubbles in piping tf bff rotierendrotating stationary stationar system of pump or buffer fluid system. A short collection of mechanical seal performance calculations has always been included in the earlier and current editions of the seal standard api 682 and the cobranded version of iso 21049. Used for applications where products have high pressure and are. Prevents highly viscous fluids from freezingpolymerizing at lower temperatures because the flushing line is not exposed to the atmosphere like in plan 11. Improvements in piping plans have made seal installations more reliable. Though the wide range of equipment required by the chemical industry poses a challenge, its one well met by john crane. Api 610 is the api standard about centrifugal pumps and is primarily intended for use in the petroleum, natural gas and chemical industries. This flush plan basically vents the seal chamber at a high point back to the suction of the pump ideally a.
Prevents product from vaporizing by maintaining positive pressure above vapor pressure. Clean, nonpolymerizing fluids at moderate temperatures. Mechanical seal support systems api 682 solutions configured locally from the company you trust. 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. A task force was formed in 1990 and the first meeting was held in january1991. Nov 06, 2012 mechanical seals piping plans api 628 1. 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.
This is an internal recirculation from the pump discharge into the seal. The barrier fluid is pressurized by means of an externally supplied pressurization gas. Swagelok mechanical seal support systems are api 682 compliant and designed to extend the life of your seals. Sometimes operating conditions change to become quite different from the specific conditions for which the seal was intended. Cpi plan 7311 bypass flush lubricates single seal faces. Selecting a seal flush piping plan for your single mechanical. Standard flush plans for mechanical seal plan 01 see figure 1.
As part of their educational mission they develop publications such as the mechanical seal handbook, a primer intended to complement the more detailed manufacturers documents produced by the member companies. Connecting to the discharge port will allow for the high pressure discharge fluid to travel to the seal chamber and reenter the process. Recirculation from pump discharge through a orifice to the seal. Common types of pumps mechanical seal piping plans. Seal chamber pressure an overview sciencedirect topics. Circulation is maintained by using pumping ring in running condition and by thermosyphon effect in stand still condition.
To request a seal quote, please fill out this information sheet as complete as possible and return it to ppc. We have handson experience with virtually every style and standard of rotating equipment, and weve developed a broad range of solutions with proven application success. Most common types of pump seal piping plans for single seals are discussed in following paragraphs. Pumpsshaft sealing systems for centrifugal and rotary. Api standard 682 from the american petroleum institute provides various seal plan configurations, their advantages and disadvantages and. Api plan 62 quench stream from an external source to the atmospheric side of the seal faces. Recommended lubricant selection for seal installation. Mechanical seal piping plans flowserve corporation.
Api standard defines as flashing all hydrocarbons that have a vapour pressure higher that 1 barg and for these fluids a double or tandem balanced seal has to be provided. Swageloks mechanical seal support systems are designed to maximize the life of mechanical seals and the reliability of rotating equipment by maintaining lubrication and system pressure and providing properly conditioned fluid flows. Api plan 23 utilizes a circulation device, typically a pumping ring, to route the flush fluid from the seal chamber through a cooler before returning the cooled fluid to the seal chamber. Api plan 01 eagleburgmann api piping plans overview process side between seals atmospheric side engineered integral internal recirculation from the pump discharge to the seal chamber. Single seals what seal flush from an external clean vice through cooler. Integral internal recirculation is from pump discharge to seal. Api seal flush plan 32 mechanical seal engineering eng. Advancements in mechanical sealing flowserve corporation. A ruleofthumb for 3600 rpm pumps would be to inject 1 gpm for each inch of seal diameter. These are standardized flushing piping arrangements that are widely used in the industry. In case of pumps with api seal flush plan 32, what should be the seal flush pressure.
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. Piping plans are designed and operated with a focus on improving the seal performance. We normally adjust api plan 32 flush for a target flow rate which is defined by the seal manufacturer for the particular service. The new draft of the fourth edition of api 682 and the planned update of iso 21049 include a significantly expanded version of.
Depressurised buffer fluid circulation in outboard seal of a dual seal configuration through a seal support system. This plan provides an external barrier fluid which circulates from the seal to a reservoir and back to the seal. The shaft seal is exposed to widely varying operating conditions. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the. Nspl pump seal design api 682 based on api 682, all mechanical seal shall be cartridge design. Mechanical seals piping plans api 628 linkedin slideshare.
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