API 682 4TH EDITION PDF
API PIPING PLANS API 4th Edition “To check out mechanical seal flushing arrangements and piping plans, I have consistently found this to be the most. EagleBurgmann range of balanced pusher and metal bellows mechanical seals acc. to API 4th ed. EagleBurgmann SPB6 seal supply system Plan 53B. Advancements in mechanical Sealing - API 4Th ecogenenergy.info - Download as PDF File .pdf), Text File .txt) or read online.
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API 4th Ed datasheet - Download as PDF File .pdf), Text File .txt) or read online. API 4th Ed datasheet. The new 4th edition of API is in line with the latest achievements and current developments. EagleBurgmann offers the widest portfolio of seals and seal. The Development of API 4th Edition. Peter Bowden. Sponsored by AESSEAL plc. Rotherham, UK. Peter Bowden is semi-retired having worked for 19 years.
If maintained properly the best of all single seal plans subject to acceptance of contamination. Dirty or contaminated fluids. High temperature applications.
Polymerizing and oxidizing fluids. Media with poor lubrication properties.
External source should be continuous and reliable at all times, even during start up and shut down. Flush fluid must be compatible with process fluid due to product contamination.
Product degradation can occur. Ensure use with close clearance throat bushing to maintain pressure in stuffing box and control the rate of contamination of pumped media. Careful selection of flush fluid required to ensure that it does not vapourised on entering the seal chamber. Fluid expenditure of Plan 32 may be as expensive as one or more seals per year.
Improves pressure margin to vapour pressure. In hot services containing suspended solids. Circulation is maintained by using pumping ring in running condition and by thermosyphon effect in stand still condition. No process contamination. No direct process leakage to atmosphere. No need to maintain pressure system as in Plan 53A.
For media where product dilution is not allowed but leakage to atmosphere in diluted form may be allowed. Preferred for clean, non-polymerizing media with vapour pressure higher than buffer fluid pressure Is also used for lower vapour pressure media. Keep the sealant vessel 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 in dirty or polymerizing products. A restriction orifice is necessary in vent line to maintain back pressure in pot and facilitate quick release of vapors to flare. Pressure switch setting should be done above minimum flare back pressure in order to avoid false alarms. Never run the system with level in the sealant vessel being at low level as marked on the level gauge.
Check for temperature difference in inlet and outlet lines to ensure that circulation is on. Vent the system properly before start up. Circulation is maintained by using pumping ring in running condition and with thermosyphon effect in stand still condition.
In no case will media leak to atmosphere Provided the seal support system pressure is not lost. Clean fluid film formation between the inboard seal faces gives better seal life.
Works as a Plan 52 arrangement if barrier fluid pressure is lost. Applications where no leakage to atmosphere can be tolerated e. For dirty, abrasive or polymerizing products where media is unsuitable as a lubricant for inboard seal faces.
There will always be some leakage of barrier fluid into the product. Check compatibility of barrier fluid with product. Always ensure that the pressure source maintains higher pressure at the seal support system so that process does not dilute the barrier fluid.
In certain cases the inert gas can dissolve in the barrier media. Product quality can deteriorate due to barrier fluid contamination. The pressure is maintained in the seal circuit by a bladder accumulator. Keeps barrier fluid and pressurised gas inert gas separate by using a bladder.
Heat is removed from the circulation system by an air-cooled or water-cooled heat exchanger. Being a stand-alone system does not rely upon a central pressure source. Hence much more reliable than a Plan 53A. In no case will media leak to atmosphere.
Low volume of barrier fluid in system, hence heat dissipation is totally dependent on cooler efficiency. Always precharge bladder to 0.
The pressure is maintained and fluctuations are compensated in the seal circuit by a piston type accumulator. Vent system properly before start up. In no case will the media leak to the atmosphere. This allows successful operation of dual seals lacking reverse balance feature at inboard seal, when having highly variable seal chamber pressure.
Where pump pressure varies during operation needing an auto setting of barrier fluid pressure, thus maintaining the same differential throughout. Always connect reference pressure line from seal chamber to accumulator and keep it open.
To external pressure source Barrier out From external pressure source Barrier in API PLAN 54 Description: Pressurised external barrier fluid circulation from a central pressure source or by a stand alone pumping unit e. 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. 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.
Advancements in mechanical Sealing - API 682 4Th Edition.pdf
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.
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.
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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.
Brochures & Tools
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. 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 Increases product temperature margin in the seal chamber thus avoiding vaporization.
Seal runs at a lower stabilized temperature of the media. Removes only the generated seal face heat and the heat soak from the pump area, thus the cooler is smaller and more effective as compared to an equivalent Plan Uses a pumping ring for circulation in running condition. In idle condition, thermosiphon effect ensures circulation. Application Hot hydrocarbons.
Hot water services above 80 C F. Boiler feed water. Applications where increasing seal chamber pressure to improve vapor pressure margin is not possible. Remarks, checkpoints For media with high viscosities and higher freezing points, steam must be used in the cooling lines instead of water. A high-point vent valve to be provided to vent the system before start-up. A close clearance throat bushing must always be in place to reduce the heat soak from the pump.
Avoid sharp bends and 90 elbows in piping. Piping should be smooth and continuously rising. Cooler to be installed approx. Good quality cooling water is recommended to avoid deterioration of cooler efficiency. Flush outlet from seal chamber should be in the top half of the seal gland plate or the seal chamber. Pump media characteristics High temperature, clean non-polymerizing fluids. The solids are delivered to the pump suction line. The cyclone separator removes solids and prevents all but a few minor particles from reaching the seal chamber.
The media properties retained as solids are routed back to pump suction. Application Horizontal pumps conveying media like water with sand particles. Horizontal pumps conveying media with heavy suspended solids. Remarks, checkpoints Specific gravity of the solids should be at least twice that of the pumped media.
In other cases Plan 32 is recommended. The installation of the pump throat bushing must be ensured. Do not use for extremely contaminated media. Plan 32 is recommended in such cases. Can lead to reduced reliability due to abrasive wear inside the cyclone.
Routine inspection of the cyclone for abrasive wear is recommended. ZYCA4 Cast version, block-type design with integral flanges. Used in conjunction with a close clearance throat bush to maintain an elevated pressure in the seal chamber and to isolate it from pumped media. Application Fluids with solids and contaminants where pumped fluid can accept an external flush. To reduce flashing or air intrusion as in vacuum services. Can be used on horizontal as well as vertical pumps. Remarks, checkpoints The external flush media should be compatible with the pumped media.
Flush media should not vaporize on entering the seal chamber and should be always on even during start-up and shut-down. Pressure of the external flush should always be at least 2 bar 29 PSI above seal chamber pressure.
Consider economic impact of product dilution, if any. A cyclone separator removes solids and prevents all but a few minor particles from reaching the seal chamber. The media properties retained as solids are routed back to the pump suction.
The cooler cools down the media and improves the pressure margin to the vapor pressure. Application Horizontal pumps conveying hot media with heavy solids.
Horizontal pumps conveying hot water with sand or slag inclusions. Not applicable for extremely contaminated media. Cooler performance is high and may lead to water side fouling.
The buffer liquid shall be maintained at a pressure less than seal chamber pressure and less than 2. The pumped fluid will not become contaminated. The pumped media does not leak directly to atmosphere. No pressurization required for the reservoir as is case of a Plan 53A.
Provision of cooling coil inside the reservoir or an external water or air cooler takes care of the heat removal. Uses an internal circulating device to ensure buffer liquid circulation.
Application For flashing services for example light hydrocarbons, high vapor pressure fluids. Can also be used for non-flashing services. For services where product contamination by a barrier fluid is not acceptable. Remarks, checkpoints Do not use for contaminated and polymerizing media.
Use a restriction orifice plate in the vent line to maintain a back pressure in the reservoir. Vent the system before start-up. Later ensure that the vent line always remains open and is connected to the flare.
The piping from the seal to the reservoir should be self-venting. Sense the seal inlet and outlet line temperatures. Difference in the temperatures is an indication of proper flow. An increase in either the reservoir pressure or reservoir level is an indication of inboard seal leakage. A decrease in the reservoir level is an indication of outboard seal leakage.
Ensure the compatibility of buffer liquid with the pump media. The buffer liquid shall be maintained at a pressure less than the seal chamber pressure and less than 2. Check buffer liquid quality at regular intervals and replace if required. The vessels are equipped with all essential connections for fitting additional components. A nitrogen source is required for pressurization. Uses an internal circulating device to ensure barrier liquid circulation.
Barrier liquid enters the process medium through the inner seal faces.
Application For services where product dilution is acceptable. For services where media is unsuitable for lubricating the inner seal faces. For barrier pressures up to16 bar PSI. Remarks, checkpoints Always ensure that the source pressure is higher than the desired barrier pressure.
Later ensure that the vent line always remains closed. Ensure that the barrier pressure is always higher than the seal chamber pressure by at least 1. Check with the process engineer if product contamination is acceptable.
Ensure the compatibility of barrier liquid with the pump media.
Plan 53B 67 Features The barrier fluid and nitrogen are separated by a bladder which effectively prevents the nitrogen from mixing with the barrier fluid as in the case of a Plan 53A.
The pumped medium generally does not leak to the atmosphere unless the bladder pressure is lost. High reliability as a stand-alone system without need for a permanent nitrogen source and external pressure. Heat removal by water or air cooler. For services where media is unsuitable for flushing the inner seal faces. For services where Plan 53A cannot be used due to nonavailability of a permanent, reliable nitrogen supply at required pressure.
Remarks, checkpoints Check with the process engineer if product contamination is acceptable. Check barrier fluid compatibility with the media. Always pre-charge the bladder at the correct pressure to ensure the required barrier pressure at the operating temperature.
Refer to the nameplate affixed to the accumulator. Difference in the temp- eratures is an indication of proper flow. Since there is less barrier fluid volume in the accumulator, heat dissipation is a function of the cooler efficiency. The SPBA4 Plan 53B range is available with a pressure accumulator, cooler finned tube, water or air cooler with fan and a wide range of instruments.
SPB6 Barrier fluid system with bladder accumulator Learn more about our products: eagleburgmann. The barrier pressure is generated from the seal chamber pressure. The system is self-energizing and reacts to fluctuations in the seal chamber fluid pressure. Uses the seal chamber pressure as a reference pressure and accordingly magnifies the barrier pressure by a pre-defined ratio.
Highly reliable since there is no need for an external pressure source. Heat is removed with the help of a water cooler or an air cooler. For services where Plan 53A cannot be used due to nonavailability of a permanent, reliable nitrogen supply.The collection reservoir should be compliance with API have a reasonable constructed from schedule 40 pipe.
Unpressurised external barrier fluid circulation from a central pressure source or by a stand alone pumping unit Features: The seal will be shipped with a plastic bag containing the Vapor pressure margin is the difference correct metal plugs.
Later ensure that the vent line always remains closed. These serve not only as a means to digit API seal code e.
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