Comments for MechanicalSeal.org http://mechanicalseal.org The portal of mechanical seals. Mon, 06 Feb 2012 09:11:58 +0000 hourly 1 http://wordpress.org/?v=3.0.4 Comment on How dry gas seal works in a Cenrifugal compressor? by hpfgirl http://mechanicalseal.org/2011/01/25/how-dry-gas-seal-works-in-a-cenrifugal-compressor/comment-page-1/#comment-509 hpfgirl Tue, 25 Jan 2011 15:30:32 +0000 http://mechanicalseal.org/2011/01/25/how-dry-gas-seal-works-in-a-cenrifugal-compressor/#comment-509 Mechanical seals have two faces, usually a hard and a soft material that are within 2 lightbands of flatness on the surface where they meet. One face is fastened to the shaft (rotating) and one face is stationary. The two faces rub against eachother with very thin fluid film between them. One of the faces is spring loaded so that they will stay together even when the pump is not pressurized. Under normal operation, hydraulic forces hold the faces together. Dry gas seals are essentially the same as mechanical seals used in pumps. The main difference is the hard face usually has an etched design that provides "lift-off" capability. When the compressor is running at the minimum speed the faces won't actually touch, so they can run dry. In most cases, you will have two sets of faces, between which you would supply a buffer gas. This prevents process gas from reaching the atmosphere. Mechanical seals have two faces, usually a hard and a soft material that are within 2 lightbands of flatness on the surface where they meet. One face is fastened to the shaft (rotating) and one face is stationary. The two faces rub against eachother with very thin fluid film between them. One of the faces is spring loaded so that they will stay together even when the pump is not pressurized. Under normal operation, hydraulic forces hold the faces together.

Dry gas seals are essentially the same as mechanical seals used in pumps. The main difference is the hard face usually has an etched design that provides “lift-off” capability. When the compressor is running at the minimum speed the faces won’t actually touch, so they can run dry. In most cases, you will have two sets of faces, between which you would supply a buffer gas. This prevents process gas from reaching the atmosphere.

]]> Comment on whatis a mechanical seal? by jdsheth2004 http://mechanicalseal.org/2011/01/23/qwhat-is-a-mechanical-seal/comment-page-1/#comment-473 jdsheth2004 Sun, 23 Jan 2011 20:52:40 +0000 http://mechanicalseal.org/2011/01/23/qa-whatis-a-mechanical-seal/#comment-473 A mechanical seal, is a type of seal utilised in rotating equipment, such as pumps and compressors. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Since the shaft rotates, preventing this leakage can be difficult. Earlier pump models used mechanical packing to seal the shaft. Since WWII, mechanical seals have replaced packing in almost all applications. A mechanical seal is an improvement on gland type sealing pumps.It is highly recommended when chemical/fluid handled is costly,hazardous,toxic and it is used to save marginal amount of power.In gland type pump there is always leakage through a gland housing(1 drop/sec) which goes to ETP which has treat it and hence load on ETP WHICH IS ALSO A LOSS of power.Basically there are two types of mechanical seal:balanced and unbalanced. Balanced seal are recommended in high pressure applications. A mechanical seal is a device which helps join systems or mechanisms together by preventing leakage (e.g., in a plumbing system), containing pressure, or excluding contamination. Please visit for detailed information: http://www.mcnallyinstitute.com/02-html/2-10.html (The function of a mechanical seal is to seal the opening where the shaft enters the pump, preventing fluid leakage.Originally mechanical seals were developed to overcome the negative issues affiliated with packed stuffing boxes. Simple mechanical seals offered an alternative to fluid leakage; none, least not detectable with the naked eye. They eliminated the need for a routine maintenance schedule as once properly selected and installed they would function without attention until the seal faces themselves wore out which could be years later, versus packing months. While initial cost to purchase a pump with a simple seal may have been higher their were no post installation costs and the return for this investment could be realized immediately with virtually zero product loss over the life of the seal. (http://answers.yahoo.com/question/index?qid=20061123085445AAkeCmS) A mechanical seal, is a type of seal utilised in rotating equipment, such as pumps and compressors. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Since the shaft rotates, preventing this leakage can be difficult. Earlier pump models used mechanical packing to seal the shaft. Since WWII, mechanical seals have replaced packing in almost all applications.

A mechanical seal is an improvement on gland type sealing pumps.It is highly recommended when chemical/fluid handled is costly,hazardous,toxic and it is used to save marginal amount of power.In gland type pump there is always leakage through a gland housing(1 drop/sec) which goes to ETP which has treat it and hence load on ETP WHICH IS ALSO A LOSS of power.Basically there are two types of mechanical seal:balanced and unbalanced. Balanced seal are recommended in high pressure applications.
A mechanical seal is a device which helps join systems or mechanisms together by preventing leakage (e.g., in a plumbing system), containing pressure, or excluding contamination.
Please visit for detailed information:
http://www.mcnallyinstitute.com/02-html/2-10.html
(The function of a mechanical seal is to seal the opening where the shaft enters the pump, preventing fluid leakage.Originally mechanical seals were developed to overcome the negative issues affiliated with packed stuffing boxes. Simple mechanical seals offered an alternative to fluid leakage; none, least not detectable with the naked eye. They eliminated the need for a routine maintenance schedule as once properly selected and installed they would function without attention until the seal faces themselves wore out which could be years later, versus packing months. While initial cost to purchase a pump with a simple seal may have been higher their were no post installation costs and the return for this investment could be realized immediately with virtually zero product loss over the life of the seal.
(http://answers.yahoo.com/question/index?qid=20061123085445AAkeCmS)

]]> Comment on whatis a mechanical seal? by biomedking http://mechanicalseal.org/2011/01/23/qwhat-is-a-mechanical-seal/comment-page-1/#comment-472 biomedking Sun, 23 Jan 2011 20:30:29 +0000 http://mechanicalseal.org/2011/01/23/qa-whatis-a-mechanical-seal/#comment-472 it's a seal that is made when two mechanical or physical components seal an opening to create vacuum or pressure. As an example carbon vane compressors work when the carbon vane is spun and scrapes the outside of the cylinder under induced gravitational force to create pressure. it’s a seal that is made when two mechanical or physical components seal an opening to create vacuum or pressure. As an example carbon vane compressors work when the carbon vane is spun and scrapes the outside of the cylinder under induced gravitational force to create pressure.

]]> Comment on whatis a mechanical seal? by blitzkrieg_hatf6 http://mechanicalseal.org/2011/01/23/qwhat-is-a-mechanical-seal/comment-page-1/#comment-471 blitzkrieg_hatf6 Sun, 23 Jan 2011 20:03:52 +0000 http://mechanicalseal.org/2011/01/23/qa-whatis-a-mechanical-seal/#comment-471 the seal that is palced mechanically, like some gasket to seal two parts together (eg head of the centrifugal pump) the seal that is palced mechanically, like some gasket to seal two parts together (eg head of the centrifugal pump)

]]> Comment on whatis a mechanical seal? by c2a3j4u5n6 http://mechanicalseal.org/2011/01/23/qwhat-is-a-mechanical-seal/comment-page-1/#comment-470 c2a3j4u5n6 Sun, 23 Jan 2011 19:14:16 +0000 http://mechanicalseal.org/2011/01/23/qa-whatis-a-mechanical-seal/#comment-470 a device, or part if you will, which seperates two areas, such as the inside and outside of the pump, or the propulsion chamber from the intake. perhaps as simple as clever design with an ' o-ring' to allow for vibration and movement of the device ( pump ) a device, or part if you will, which seperates two areas, such as the inside and outside of the pump, or the propulsion chamber from the intake. perhaps as simple as clever design with an ‘ o-ring’ to allow for vibration and movement of the device ( pump )

]]> Comment on what is quench in mechanical seal? by alpha b http://mechanicalseal.org/2011/01/22/what-is-quench-in-mechanical-seal/comment-page-1/#comment-457 alpha b Sat, 22 Jan 2011 21:55:16 +0000 http://mechanicalseal.org/2011/01/22/what-is-quench-in-mechanical-seal/#comment-457 *QUENCH: Water flushing will generally remove crystal deposits and low pressure steam will remove ‘coke’ from hydrocarbons.To remove or prevent the build up of crystals or decomposition products on the atmospheric side of the seal *Plan #62 The quench gland. Often called the API gland. In general usage the term quench is frequently used to describe the cooling of a heated metal, or to extinguish a flame. In the seal business, quench (Q) is a term used to describe the introduction of a fluid outside the mechanical seal. We use this fluid to: * To cool the product we are sealing * To dilute any leakage that might migrate across the seal faces. * To introduce low-pressure steam behind the seal to put out a fire. * A close fitting bushing (DB) in the end of the gland directs the quench fluid down a drain hole on the opposite side of the seal gland * Steam is the most popular quench medium, but care should be taken that the steam pressure is very low, or the hot steam will penetrate through the nearby bearing seals and contaminate the bearing oil. *Often called the vent and drain (Q connection on an A.P.I. gland) * Some seal glands have a vent or quench connection provided behind the seal so that steam or some other fluid can be used to control temperature in the seal area. A close fitting carbon ( or any other non sparking material) bushing is installed outboard of this connection to provide a close clearance between the gland and the shaft. * Refinery applications use a version of the quench gland and call it an A.P.I. ( American Petroleum Institute) gland. *QUENCHING OR VENT & DRAIN - plus the disaster bushing. * The disaster bushing will protect the seal from hitting the inside of the stuffing box if you have a bearing failure. This is a very important feature in those applications where the product will burn or explode if overheated. * The disaster bushing will protect personnel if there is a massive seal failure. The majority of the leakage can be directed, down the drain connection, to a collecting tank or vent. * To wash away solids from the outboard side of the seal that will prevent "hang up" as the seal face wears and the seal moves forward. * To wash away toxic or corrosive vapors that might leak across the seal faces. * To control the temperature in the seal area. * As a back up to a heating/ cooling jacketing failure. *QUENCH:
Water flushing will generally remove crystal deposits and low pressure steam will remove ‘coke’ from hydrocarbons.To remove or prevent the build up of crystals or decomposition products on the atmospheric side of the seal

*Plan #62 The quench gland. Often called the API gland.

In general usage the term quench is frequently used to describe the cooling of a heated metal, or to extinguish a flame. In the seal business, quench (Q) is a term used to describe the introduction of a fluid outside the mechanical seal. We use this fluid to:

* To cool the product we are sealing
* To dilute any leakage that might migrate across the seal faces.
* To introduce low-pressure steam behind the seal to put out a fire.
* A close fitting bushing (DB) in the end of the gland directs the quench fluid down a drain hole on the opposite side of the seal gland
* Steam is the most popular quench medium, but care should be taken that the steam pressure is very low, or the hot steam will penetrate through the nearby bearing seals and contaminate the bearing oil.

*Often called the vent and drain (Q connection on an A.P.I. gland)

* Some seal glands have a vent or quench connection provided behind the seal so that steam or some other fluid can be used to control temperature in the seal area. A close fitting carbon ( or any other non sparking material) bushing is installed outboard of this connection to provide a close clearance between the gland and the shaft.
* Refinery applications use a version of the quench gland and call it an A.P.I. ( American Petroleum Institute) gland.

*QUENCHING OR VENT & DRAIN – plus the disaster bushing.

* The disaster bushing will protect the seal from hitting the inside of the stuffing box if you have a bearing failure. This is a very important feature in those applications where the product will burn or explode if overheated.
* The disaster bushing will protect personnel if there is a massive seal failure. The majority of the leakage can be directed, down the drain connection, to a collecting tank or vent.
* To wash away solids from the outboard side of the seal that will prevent “hang up” as the seal face wears and the seal moves forward.
* To wash away toxic or corrosive vapors that might leak across the seal faces.
* To control the temperature in the seal area.
* As a back up to a heating/ cooling jacketing failure.

]]> Comment on mechanical seal for pump? by crodriguez717 http://mechanicalseal.org/2011/01/21/mechanical-seal-for-pump/comment-page-1/#comment-433 crodriguez717 Fri, 21 Jan 2011 02:10:24 +0000 http://mechanicalseal.org/2011/01/21/mechanical-seal-for-pump/#comment-433 It all really depends on the service of the process fluids and plant standards. Usually when the pump is needing a seal pot containment is an issue. Pressurizing the seal pot with the nitrogen forces the barrier fluid to be pushed into the primary seal and into the process fluid. If in the event the primary seal sees a catastrophic failure the pressurization of the secondary seal limits the emmisions to the atmosphere. API plans 53's and 54's are also used when the process fluid is very dirty or at elevated temperatures. Hope this helps. --C. It all really depends on the service of the process fluids and plant standards. Usually when the pump is needing a seal pot containment is an issue. Pressurizing the seal pot with the nitrogen forces the barrier fluid to be pushed into the primary seal and into the process fluid. If in the event the primary seal sees a catastrophic failure the pressurization of the secondary seal limits the emmisions to the atmosphere.
API plans 53′s and 54′s are also used when the process fluid is very dirty or at elevated temperatures.
Hope this helps.
–C.

]]> Comment on mechanical seal for pump? by starsysmzg http://mechanicalseal.org/2011/01/21/mechanical-seal-for-pump/comment-page-1/#comment-432 starsysmzg Fri, 21 Jan 2011 02:06:19 +0000 http://mechanicalseal.org/2011/01/21/mechanical-seal-for-pump/#comment-432 all the pumps have to be fitted with seal at both ends of the shaft, to stop leakage of the fluid or gases. Depending upon the type of fluid, RPM of the Pump, Pressure and temprature, the seals are designed, Nitogen capping is often used for retaining evaporative fluids. all the pumps have to be fitted with seal at both ends of the shaft, to stop leakage of the fluid or gases. Depending upon the type of fluid, RPM of the Pump, Pressure and temprature, the seals are designed, Nitogen capping is often used for retaining evaporative fluids.

]]> Comment on mechanical seal for pump? by cpl_cpl_halol c http://mechanicalseal.org/2011/01/21/mechanical-seal-for-pump/comment-page-1/#comment-431 cpl_cpl_halol c Fri, 21 Jan 2011 01:37:11 +0000 http://mechanicalseal.org/2011/01/21/mechanical-seal-for-pump/#comment-431 *Nitrogen is an inert gas,which do not react with puming fluid. Reciprocating pumps are having pulsating flow and to minimise the pulsations there is a pulsation dampener in a suction and discharge line which uses nitrogen. *Dampeners reduces wear and tear of the moving parts of a pump and 84 % power saning in head loss due to friction. *Seal pots are chambers that capture water, thus preventing inaccurate measurement by a gas flowmeter. *[Occupational health risks may derive from worker exposure to hazardous chemical substances, including active ingredients and pesticide dusts, during all production phases. Worker exposure to solvent vapors may occur during manufacturing and formulation processes, including operations for recovering or isolating products; handling wet cakes in drying operations; wet granulation; uncontained filtration equipment; equipment cleaning; and fugitive emissions from leaking pumps, valves and manifold stations (e.g. during extraction and purification steps). In pesticides formulation and packaging processes, workers may be exposed to airborne dusts during drying, milling and mixing operations. Occupational hazards are associated with exposure to mixtures containing high proportions of active ingredients, and with exposure to carriers / fillers and additives. These agents, although inert in terms of pesticide activity to the target pest, may be toxic and should be assessed for occupational health impacts. Recommended hazard prevention and control measures include: · Unloading of toxic raw materials and products with a gas balancing system to minimize fugitive emissions and prevent worker exposure; · Gravity charging from enclosed containers, and enclosed vacuum, pressure, and pumping systems during charging and discharging operations to minimize fugitive emissions; ·Partitioning of workplace areas with dilution ventilation and / or differential air pressures. Where toxic materials are processed, consider maintaining the plant under slight overpressure (e.g. nitrogen blanketing); · Installation of laminar ventilation hoods or isolation devices where toxic materials are handled. *[A mechanical seal, is a type of seal utilised in rotating equipment, such as pumps and compressors. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Since the shaft rotates, preventing this leakage can be difficult. Earlier pump models used mechanical packing to seal the shaft. Since WWII, mechanical seals have replaced packing in almost all applications. A mechanical seal is an improvement on gland type sealing pumps.It is highly recommended when chemical/fluid handled is costly,hazardous,toxic and it is used to save marginal amount of power.In gland type pump there is always leakage through a gland housing(1 drop/sec) which goes to ETP which has treat it and hence load on ETP WHICH IS ALSO A LOSS of power.Basically there are two types of mechanical seal:balanced and unbalanced. Balanced seal are recommended in high pressure applications. A mechanical seal is a device which helps join systems or mechanisms together by preventing leakage (e.g., in a plumbing system), containing pressure, or excluding contamination. Please visit for detailed information: http://www.mcnallyinstitute.com/02-html/... (The function of a mechanical seal is to seal the opening where the shaft enters the pump, preventing fluid leakage.Originally mechanical seals were developed to overcome the negative issues affiliated with packed stuffing boxes. Simple mechanical seals offered an alternative to fluid leakage; none, least not detectable with the naked eye. They eliminated the need for a routine maintenance schedule as once properly selected and installed they would function without attention until the seal faces themselves wore out which could be years later, versus packing months. While initial cost to purchase a pump with a simple seal may have been higher their were no post installation costs and the return for this investment could be realized immediately with virtually zero product loss over the life of the seal. (http://answers.yahoo.com/question/index?... http://en.wikipedia.org/wiki/rotating_fa...] *Nitrogen is an inert gas,which do not react with puming fluid.
Reciprocating pumps are having pulsating flow and to minimise the pulsations there is a pulsation dampener in a suction and discharge line which uses nitrogen.
*Dampeners reduces wear and tear of the moving parts of a pump and 84 % power saning in head loss due to friction.
*Seal pots are chambers that capture water, thus preventing inaccurate measurement by a gas flowmeter.
*[Occupational health risks may derive from worker exposure to
hazardous chemical substances, including active ingredients
and pesticide dusts, during all production phases. Worker
exposure to solvent vapors may occur during manufacturing and
formulation processes, including operations for recovering or
isolating products; handling wet cakes in drying operations; wet
granulation; uncontained filtration equipment; equipment
cleaning; and fugitive emissions from leaking pumps, valves and
manifold stations (e.g. during extraction and purification steps).
In pesticides formulation and packaging processes, workers
may be exposed to airborne dusts during drying, milling and
mixing operations. Occupational hazards are associated with
exposure to mixtures containing high proportions of active
ingredients, and with exposure to carriers / fillers and additives.
These agents, although inert in terms of pesticide activity to the target pest, may be toxic and should be assessed for
occupational health impacts.
Recommended hazard prevention and control measures
include:
· Unloading of toxic raw materials and products with a gas
balancing system to minimize fugitive emissions and
prevent worker exposure;
· Gravity charging from enclosed containers, and enclosed
vacuum, pressure, and pumping systems during charging
and discharging operations to minimize fugitive emissions;
·Partitioning of workplace areas with dilution ventilation and
/ or differential air pressures. Where toxic materials are
processed, consider maintaining the plant under slight
overpressure (e.g. nitrogen blanketing);
· Installation of laminar ventilation hoods or isolation devices
where toxic materials are handled.
*[A mechanical seal, is a type of seal utilised in rotating equipment, such as pumps and compressors. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Since the shaft rotates, preventing this leakage can be difficult. Earlier pump models used mechanical packing to seal the shaft. Since WWII, mechanical seals have replaced packing in almost all applications.

A mechanical seal is an improvement on gland type sealing pumps.It is highly recommended when chemical/fluid handled is costly,hazardous,toxic and it is used to save marginal amount of power.In gland type pump there is always leakage through a gland housing(1 drop/sec) which goes to ETP which has treat it and hence load on ETP WHICH IS ALSO A LOSS of power.Basically there are two types of mechanical seal:balanced and unbalanced. Balanced seal are recommended in high pressure applications.
A mechanical seal is a device which helps join systems or mechanisms together by preventing leakage (e.g., in a plumbing system), containing pressure, or excluding contamination.
Please visit for detailed information:
http://www.mcnallyinstitute.com/02-html/...
(The function of a mechanical seal is to seal the opening where the shaft enters the pump, preventing fluid leakage.Originally mechanical seals were developed to overcome the negative issues affiliated with packed stuffing boxes. Simple mechanical seals offered an alternative to fluid leakage; none, least not detectable with the naked eye. They eliminated the need for a routine maintenance schedule as once properly selected and installed they would function without attention until the seal faces themselves wore out which could be years later, versus packing months. While initial cost to purchase a pump with a simple seal may have been higher their were no post installation costs and the return for this investment could be realized immediately with virtually zero product loss over the life of the seal.
(http://answers.yahoo.com/question/index?...

http://en.wikipedia.org/wiki/rotating_fa…

]]> Comment on what is the function of mechanical seal? by de lascas http://mechanicalseal.org/2011/01/18/what-is-the-function-of-mechanical-seal/comment-page-1/#comment-394 de lascas Tue, 18 Jan 2011 07:17:16 +0000 http://mechanicalseal.org/2011/01/18/what-is-the-function-of-mechanical-seal/#comment-394 most machines need to be lubricated regularly, either with grease oil or water. some machine are self lubricating. the seal is used to prevent the leakage of lubricants in machines. In other cases it is used to prevent the free flow of liquid . eg in a sink. most machines need to be lubricated regularly, either with grease oil or water. some machine are self lubricating.
the seal is used to prevent the leakage of lubricants in machines.
In other cases it is used to prevent the free flow of liquid . eg in a sink.

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