API 682 3RD EDITION PDF

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API 3rd for Training - Download as PDF File .pdf), Text File .txt) or view API Second Edition ISO and API Third Edition Scope of Standard . API (3RD EDITION) AND ISO STANDARD A The API standard was originally published in as a guide to selecting. according to API , 3rd Edition and ISO , 1st Edition. Classification and Seal Selection. Applications. Mechanical Seals. 58 E. Your partner for sealing.


Api 682 3rd Edition Pdf

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acc. to API , 3rd edition. F. = Flush. FI. = Flush IN (only plan 23). FO. = Flush OUT (only plan 23). D. = Drain. Q. = Quench. V. = Vent. BI. = Buffer/Barrier IN. BO. The API Plans elaborated in this section are as defined by API 3rd edition / API 10th edition. These are standardized flushing piping arrangements that. Edition. To completely align API and ISO. , API Third Edition was issued in Since the publication of the Third Edition, seal technology has.

Design features include a distributed flush and floating throttle bushing for single seals.

Additional documentation must be also provided. Three new seal types were introduced in the 2nd Edition: Containment seals are the outer seal of Arrangement 2. In the 2nd Edition, containment seals can be used with a liquid buffer fluid, a gas buffer fluid or without a buffer fluid.

In the case of a dry running containment seal, the containment seal will be exposed primarily to buffer gas or vaporized process fluid. Such containment seals must therefore be designed for continuous dry running while meeting the reliability goals of the standard. Dry running containment seals may be either contacting or non-contacting.

Non-contacting inner seals are also introduced for Arrangement 2. One of the primary targets for non-contacting inner seals is in flashing hydrocarbon services. In some of these services, it is impossible to obtain adequate vapor margins to prevent flashing of the fluid in the seal chamber.

This seal will be used with a dry running containment seal and the leakage past the inner seal will be piped to a vapor recovery system. The other new seal type introduced in 2nd Edition was the dry running gas seal used in Arrangement 3.

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This seal is designed to run on a gas barrier fluid such as nitrogen. Several new piping plans were introduced in the 2nd Edition.

These included additional options for dual pressurized liquid seals as well as new piping plans to support containment seals and dual pressurized gas seals. One of the strengths of the 1st Edition was to provide qualification tests in which seal vendors would be required to prove the suitability of their seals for a given service. The 2nd Edition expanded on these requirements by adding new tests for containment seals and dual gas seals as well as defining acceptance criteria for all tests.

The ISO Organization made slight editorial changes to 2nd Edition, including correcting typographical errors and unit conversions. Therefore, API had to re-issue a corrected 2nd edition but choose to label it as 3rd edition. API 3rd Edition was published in September The issue of ISO is the only issue and plans to update it are unknown. A twenty-five member task force spent six years updating 3rd Edition to 4th Edition. Seal Configuration refers to the orientation of the seal components in an assembly.

In previous editions, orientations were defined as face-to-back, back-to-back, and face-to-face and these terms are carried over into the 4th Edition. In 4th Edition, any orientation face to back, back to back, face to face can be used in a dual seal provided that the design features are appropriate to the functionality of that particular arrangement.

The minimum clearances specified apply only to equipment within the scope of the standard. Equipment outside that scope, such as non-cartridge seals, older pumps, non-API pumps and certain severe services, might benefit from larger clearances. API attempted to use a more comprehensive seal code; however, that code changed with every edition of API The goal of the qualification test was to simulate a long-term steady state run followed by a process upset.

The simulated process upset consisted of pressure changes, temperature changes and included loss of flush. The results of these tests were made available to the downloadr for evaluation.

There was no acceptance criteria presented in API 1st Edition. To some degree, this was intentional and was done in order to reduce inventory, promote familiarity with a limited number of seal types and to increase reliability. Broadening the scope of pumps covered by API would allow standardized seals to be applied in a greater number of industries.

A seal category describes the type of pump into which the seal will be installed, the operating window, the design features, and the testing and documentation requirements. There are three categories designated as Category 1, 2, or 3. Category 3 seals are essentially the original seals of 1st Edition and are also intended for API pumps. Category 3 seals are intended for the most demanding applications.

Design features include a distributed flush and floating throttle bushing for single seals. Additional documentation must be also provided.

Features: 1. Ensures higher flow rate, better heat dissipation and positive circulation of barrier fluid. Can also be given as a stand alone unit per pump. Increases cooler efficiency due to higher flow rate to the heat exchanger. Uses: 1. For dirty, abrasives or polymerizing products where media is unsuitable as a lubricant for inboard seal faces. Caution: 1. Carefully consider the reliability of barrier fluid source, if a central source is used. Circulating system must be pressurised at least 1.

Product contamination does occur. Barrier fluid selected should be compatible with the process fluid. Loss of pressure in system can lead to entire barrier liquid contamination.

Module 1 Revision 1.2

Ensures higher flow rate, better heat dissipation and positive circulation of buffer fluid. Can also be given as a stand-alone unit per pump. No direct leakage to atmosphere. For media where product dilution is not allowed but leakage to atmosphere in diluted form maybe allowed 2.

Preferred for clean, non-polymerizing media that may solidify in contact with atmosphere. Wherever Plan 52 circulation is insufficient to dissipate heat. Carefully consider the reliability of buffer fluid source, if a central source is used. Circulating system pressure must be less than seal chamber pressure and less than 28bar 3. Not suitable for polymerizing media. Ensure suitable flow is maintained at all times.

GBI port can be piped to use as in Plan For future provisions for API Plans 72, 75 and Always keep the ports plugged. Used for: 2CW-CS. Features 1 Can be used with Plan 72 with buffer gas or with Plan 71 without buffer gas systems. Collection can be redirected to process fluid by using separate pumping device. Can be used in single containment seal also. Duties with condensing leakages. Hazardous, toxic fluids. May also be used for non-condensing leakages.

In such cases, the collector can help in collecting condensate from the vapour recovery system. Ensure that collection system is located below the seal drain with sloping pipelines. Drain port should be at bottom of containment seal to allow the leakage to flow to the collection system.

Collection system should always be vented releasing vapors of process liquid to vapour recovery system. Valves that are installed should be accessible to operator relative to ground clearance and other obstructions. A flow control orifice is required to create back pressure on collection system and to have effective condensation of vapors.

Pressure switch should be set at a gauge pressure of 0.

API 682 3rd for Training

Can be used with Plan 72 with buffer gas or with Plan 71 without buffer gas system. Vapour leakage collection ensures zero to very low process emissions from outboard containment seal.

For high vapour pressure fluids, light hydrocarbons. For hazardous or toxic media. Do not use for condensing media. Ensure continuous vent to low pressure vapour recovery or flare system. A flow control orifice is required to generate back pressure. Ensure proper support to harness piping. Ensure a low point drain in the system. WaterAid is an international charity dedicated to their vision of helping people all over the globe escape the stranglehold of poverty and disease caused by living without water and sanitation.

This means that when you install a Seal Support System you are helping WaterAid to provide clean water and sanitation to those who really need it. Preferred for clean, non-polymerizing media with vapour pressure higher than buffer fluid pressure.

Keep pot vent continuously open, which is necessary to maintain buffer fluid pressure close to atmospheric pressure and vent the vapors to flare. Should not be used with dirty or polymerizing products. Never run the system with level in the sealant vessel at low level as marked on the level gauge. A vessel with a high level alarm is provided for detection of excess leakage.

Normally used with single seals where the leakage is expected to be mostly liquid. Piping is connected to the drain connection of the gland plate. Excessive flowrates are restricted by the orifice downstream of the vessel causing leakage to accumulate in the vessel activating level alarm.

Vessel overflow prevents vessel pressurisation in event of seal failure. In services where seal leakage is condensing. Used for single seals.

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Vent connection should always be plugged. Orifice downstream of the level switch should be located in vertical piping leg to avoid accumulation of fluid in drain piping. Shut down the pump as soon as high-level alarm is activated and attend the seal. Reservoir must be located below seal gland. A vessel with a high level alarm is provided for detection of cumulative leakage. Features 1 Normally used with single seals where the leakage is expected to be mostly liquid.

Leakage is collected in the vessel until the high level alarm is reached. Excessive fill rate indicates seal failure.

Overflow line should bypass system drain valve. The valve between seal and system must remain open during pump operation. The drain connection can be piped in order to collect leakage and use as Plan Both quench and drain can be piped and used as quench in and out connection as Plan For future provision.

Always keep ports plugged. The quench fluid acts as barrier in between atmosphere and process fluid. The quench fluid reduces oxidation and coking of product and also cools seal faces. Flushes away undesirable material build up under seal faces. Can be used with water, steam or an inert gas.

In caustic or crystallising fluids. In oxidizing fluids or hot hydrocarbons. Can be used to purge steam in hot applications especially for stationary bellows to avoid coking.

Ensure availability of continuous supply of low-pressure quench fluid limited to maximum 1 bar.Arrangement 1: Refer to Single seal b. Duties with condensing leakages.

Caution Detailed engineering and customer input required for effective solution. Flow is maintained by an internal pumping ring. Types c.

In order to prove this, seal performance testing on process fluids under representative pressures and temperatures was required. For hazardous or toxic media.

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