Quality Is An Art For Others But it Habit For Us Quality Is An Art - - PowerPoint PPT Presentation

Quality Is An Art For Others But it Habit For Us Quality Is An Art For Others But it Habit For Us Quality Is An Art For Others But it Habit For Us Quality Is An Art For Others But it Habit For Us

The perfect Sealing Solution

Introduction Introduction Introduction Introduction

• Since their inception, mechanical seals have carried with them a

Since their inception, mechanical seals have carried with them a mystique of mystique of “ “Gee Whiz Gee Whiz” ”, bizarre, physics defying properties that have baffled the , bizarre, physics defying properties that have baffled the untrained observer. But that impression is really misplaced. Mec untrained observer. But that impression is really misplaced. Mechanical seals hanical seals are not magic by any means and actually perform well within the are not magic by any means and actually perform well within the realm of easy realm of easy to understand principles of physics and hydraulics. to understand principles of physics and hydraulics.

• Mechanical seals are simply another means of controlling leakage

Mechanical seals are simply another means of controlling leakage

• f a
• f a

process where other means are deemed to be less capable of perfo process where other means are deemed to be less capable of performing the rming the task adequately. For the purposes of this discussion, consider t task adequately. For the purposes of this discussion, consider that a hat a mechanical seal will out mechanical seal will out-

• perform common types of packing.

perform common types of packing.

• As mechanical seals can be used to seal a myriad of different pr

As mechanical seals can be used to seal a myriad of different products on an

• ducts on an

equally vast array of equipment, we will be primarily focusing o equally vast array of equipment, we will be primarily focusing on the use of n the use of mechanical seals on rotating shaft pumps. Since our subject is d mechanical seals on rotating shaft pumps. Since our subject is dealing with ealing with pumps, let pumps, let’ ’s first explore a basic understanding of the need to seal a proc s first explore a basic understanding of the need to seal a process ess liquid in a centrifugal pump. liquid in a centrifugal pump.

Centrifugal Pump Centrifugal Pump Centrifugal Pump Centrifugal Pump

• A centrifugal pump is simply a shaft, suspended on

A centrifugal pump is simply a shaft, suspended on bearings with an impeller attached to one end. The bearings with an impeller attached to one end. The impeller is encased in a housing that is filled with a impeller is encased in a housing that is filled with a

• liquid. As the shaft is rotated, centrifugal force expels
• liquid. As the shaft is rotated, centrifugal force expels

the liquid out through an orifice, where it is typically the liquid out through an orifice, where it is typically piped into a process or another collection point. As the piped into a process or another collection point. As the expelled liquid exits the case, additional liquid is added expelled liquid exits the case, additional liquid is added to the case so that a flow develops. That is basically to the case so that a flow develops. That is basically how a centrifugal pump works. how a centrifugal pump works.

• The next slide shows a photograph of a typical

The next slide shows a photograph of a typical “ “End End Suction Centrifugal Pump Suction Centrifugal Pump” ”. .

Centrifugal Pumps Centrifugal Pumps Centrifugal Pumps Centrifugal Pumps

• The force of the expelled liquid creates pressure. This

The force of the expelled liquid creates pressure. This liquid under pressure will seek areas of lower pressure. liquid under pressure will seek areas of lower pressure. This is a known physical principle of hydraulics. Some This is a known physical principle of hydraulics. Some form of seal must be applied to keep liquid from form of seal must be applied to keep liquid from leaking around the shaft at the point where it enters the leaking around the shaft at the point where it enters the case to drive the impeller. This is where our mechanical case to drive the impeller. This is where our mechanical seal comes into play. seal comes into play.

• Take a look at the same pump again. Can you see the

Take a look at the same pump again. Can you see the mechanical seal behind the impeller? mechanical seal behind the impeller?

• The mechanical seal shown

The mechanical seal shown in the pump photograph is a in the pump photograph is a Type Type “ “1 1” ”mechanical seal. mechanical seal. Probably the most widely Probably the most widely recognized and also most recognized and also most common mechanical seal common mechanical seal used in general service, low used in general service, low pressure applications. pressure applications.

• At Aum, we refer to this type

At Aum, we refer to this type as as AI108(=John Crane Type 1) AI108(=John Crane Type 1)

• The assembly shown in the

The assembly shown in the pump is configured with a pump is configured with a ceramic ceramic “ “O O-

• ring

ring” ” type type stationary seat and is also stationary seat and is also equipped with a equipped with a “ “set screw set screw collar collar” ”. .

Seal Type

Sealing The Liquid Sealing The Liquid Sealing The Liquid Sealing The Liquid

• Mechanical seals were originally designed to lend a

Mechanical seals were originally designed to lend a greater sealing capability than could be achieved using greater sealing capability than could be achieved using common packing. common packing.

• Before the advent of mechanical seals, pump users

Before the advent of mechanical seals, pump users relied primarily on relied primarily on “ “rope" or braided style packing to rope" or braided style packing to achieve a achieve a “ “seal" around the shaft. A series of pieces or seal" around the shaft. A series of pieces or “ “rings" were installed into the pump rings" were installed into the pump “ “stuffing box" and stuffing box" and they were compressed tightly so that they created a they were compressed tightly so that they created a difficult leak path for the liquid to negotiate in order to difficult leak path for the liquid to negotiate in order to leak to atmosphere. leak to atmosphere.

Sealing The Liquid Sealing The Liquid Sealing The Liquid Sealing The Liquid

• Early packing styles did not seal very well. In fact, until

Early packing styles did not seal very well. In fact, until recently, braided packing styles required varying recently, braided packing styles required varying amounts of leakage for lubrication. If leakage was not amounts of leakage for lubrication. If leakage was not permitted to occur, the packing would literally permitted to occur, the packing would literally “ “burn burn up" and often cause severe damage to the pump shaft. up" and often cause severe damage to the pump shaft. Even with adequate leakage for lubrication, pump shaft Even with adequate leakage for lubrication, pump shaft wear was a commonly expected occurrence and as the wear was a commonly expected occurrence and as the shaft wore it would in turn, cause poor shaft packing shaft wore it would in turn, cause poor shaft packing life. life.

• As leakage becomes more excessive, the gland is

As leakage becomes more excessive, the gland is tightened to reduce leakage. tightened to reduce leakage.

Sealing the liquid Sealing the liquid Sealing the liquid Sealing the liquid

• With the introduction of mechanical seals, this

With the introduction of mechanical seals, this leakage could be controlled to a much greater leakage could be controlled to a much greater degree. degree.

• Let

Let’ ’s look at the same pump with a mechanical s look at the same pump with a mechanical seal installed. Note that the seal shown is an seal installed. Note that the seal shown is an AI109 with O AI109 with O-

• Ring type stationary and a set

Ring type stationary and a set screw collar. screw collar.

SEALING THE LIQUID SEALING THE LIQUID SEALING THE LIQUID SEALING THE LIQUID

• You have probably taken notice of the

You have probably taken notice of the illustration showing minor leakage to illustration showing minor leakage to

• atmosphere. It is appropriate to point out at this
• atmosphere. It is appropriate to point out at this

time time… …

LESSON NUMBER ONE LESSON NUMBER ONE LESSON NUMBER ONE LESSON NUMBER ONE All Mechanical Seal All Mechanical Seal Leak Leak

Sealing the liquid Sealing the liquid Sealing the liquid Sealing the liquid

• It is a fact, all mechanical seals leak. Like packing, the

It is a fact, all mechanical seals leak. Like packing, the mechanical seal mechanical seal “ “faces" must also be lubricated. With faces" must also be lubricated. With proper application and design however, the leakage is proper application and design however, the leakage is so minute that actual droplets of liquid are not detected. so minute that actual droplets of liquid are not detected. Instead, the lubricating liquid will vaporize as it crosses Instead, the lubricating liquid will vaporize as it crosses the seal faces and the leakage is a gas or vapor. the seal faces and the leakage is a gas or vapor.

• Since we are discussing the sealing of the liquid at the

Since we are discussing the sealing of the liquid at the faces, let faces, let’ ’s take a look at the sealing points of a typical s take a look at the sealing points of a typical mechanical seal. Again, viewing the same pump and mechanical seal. Again, viewing the same pump and seal, note that there are four sealing points to consider. seal, note that there are four sealing points to consider.

BRIEF DISCUSSION ABOUT MECHANICAL SEAL FACE DYNAMICS

Face Flatness Face Flatness Face Flatness Face Flatness

• The mechanical seal faces are obviously the most critical sealin

The mechanical seal faces are obviously the most critical sealing point of a g point of a mechanical seal assembly. mechanical seal assembly.

• Although the faces can be manufactured from a myriad of differen

Although the faces can be manufactured from a myriad of different materials, t materials,

• ne is typically carbon, while the other is usually a hard mater
• ne is typically carbon, while the other is usually a hard material. (i.e.
• ial. (i.e. Alox

Alox (Aluminum Oxide Ceramic), Tungsten Carbide, Silicon Carbide, etc (Aluminum Oxide Ceramic), Tungsten Carbide, Silicon Carbide, etc.) .)

• In order for a

In order for a “ “seal" to be achieved, the faces must be very flat. This is seal" to be achieved, the faces must be very flat. This is achieved by machining the faces, then achieved by machining the faces, then “ “lapping" them to a fine finish. lapping" them to a fine finish.

• Flatness is measured in

Flatness is measured in “ “Light Bands Light Bands” ”. After lapping, the faces are placed on . After lapping, the faces are placed on an an “ “Optical Flat Optical Flat” ”, a clear glass surface where a monochromatic light is shined , a clear glass surface where a monochromatic light is shined

• n the face. This single wavelength light will produce an image
• n the face. This single wavelength light will produce an image of rings or
• f rings or

lines on the face. Each ring/line is lines on the face. Each ring/line is “ “One Light Band One Light Band” ”. Each light band is . Each light band is equivalent to .000011 equivalent to .000011” ”or eleven millionths of an inch. This refers to the

• r eleven millionths of an inch. This refers to the

variations in the surface of the face. On most face materials, o variations in the surface of the face. On most face materials, one ne-

• three light

three light bands is Aum bands is Aum’ ’s standard s standard

• This illustration shows a

This illustration shows a face being inspected on an face being inspected on an Optical Flat. Optical Flat.

• Take notice of the light

Take notice of the light bands that are visible on bands that are visible on the reflection of the face. the reflection of the face.

• Laying a straight edge on

Laying a straight edge on a tangent to the inside a tangent to the inside circumference of the face, circumference of the face, how many light bands are how many light bands are crossed crossed

Face Flatness

Face Flatness Face Flatness Face Flatness Face Flatness

• As was stated earlier, it is hoped that the

As was stated earlier, it is hoped that the application and design of the mechanical seal is application and design of the mechanical seal is suited for the service. If so, there is leakage of suited for the service. If so, there is leakage of

• nly vapor through the seal faces.
• nly vapor through the seal faces.

Types of Mechanical Seals Types of Mechanical Seals Types of Mechanical Seals Types of Mechanical Seals

Seal Types Seal Types Seal Types Seal Types

• There are obviously many different types and

There are obviously many different types and configurations of mechanical seals. Shaft configurations of mechanical seals. Shaft mounted and cartridge, balanced and mounted and cartridge, balanced and unbalanced, pusher and non unbalanced, pusher and non-

• pusher, single and

pusher, single and multiple, etc., etc. multiple, etc., etc.

• Here we will examine the basic differences

Here we will examine the basic differences without going into a great detail. without going into a great detail.

Seal Types Seal Types Seal Types Seal Types

• First, let us examine shaft mounted vs.

First, let us examine shaft mounted vs. cartridge. cartridge.

• A shaft mounted seal requires the pump user or

A shaft mounted seal requires the pump user or assembler to actually install individual seal assembler to actually install individual seal components into the equipment. components into the equipment.

• Let

Let’ ’s look at the installation of the TS580B that s look at the installation of the TS580B that we were looking at previously. we were looking at previously.

The stationary seat must be The stationary seat must be inserted into the seal gland. inserted into the seal gland.

The Seal assembly is slipped onto the pump shaft and the set of The Seal assembly is slipped onto the pump shaft and the set of the screws the screws tightened in the correct position to ensure proper tightened in the correct position to ensure proper “ “ installed length installed length” ”

• f the
• f the

assembly. assembly.

The gland is tightened evenly so that the seal is compressed to The gland is tightened evenly so that the seal is compressed to it it’ ’s s recommended length. recommended length.

Seal Types Seal Types Seal Types Seal Types

• A cartridge type mechanical seal is a pre

A cartridge type mechanical seal is a pre-

• assembled

assembled package of seal components making installation much package of seal components making installation much easier with fewer points for potential installation errors easier with fewer points for potential installation errors to occur. to occur.

• The assembly is

The assembly is “ “pre pre-

• set" so that no installed length

set" so that no installed length calculations must be performed for determining where calculations must be performed for determining where to set the seal. This pre to set the seal. This pre-

• set is achieved by the use of

set is achieved by the use of “ “set tabs" that are removed once the seal is installed set tabs" that are removed once the seal is installed and the pump assembled. and the pump assembled.

Although the assembly may look Although the assembly may look a little menacing, it is basically a little menacing, it is basically no different than a shaft mounted no different than a shaft mounted arrangement as far as sealing arrangement as far as sealing components and sealing points components and sealing points are concerned. are concerned. One additional sealing One additional sealing point exists in this point exists in this particular cartridge particular cartridge

• assembly. Have you
• assembly. Have you

found it? found it?

Seal Types Seal Types Seal Types Seal Types

• Remember the number of steps involved in

Remember the number of steps involved in installing the shaft mounted seal. installing the shaft mounted seal.

• Now let

Now let’ ’s look at installing the cartridge seal that s look at installing the cartridge seal that we just examined. we just examined.

Pusher VS. Non Pusher VS. Non Pusher VS. Non Pusher VS. Non-

• Pusher

Pusher Pusher Pusher

• Both pusher and non

Both pusher and non-

• pusher types can be either shaft mounted

pusher types can be either shaft mounted

• r cartridge assemblies.
• r cartridge assemblies.
• The basic difference between pusher and non

The basic difference between pusher and non-

• pusher types have

pusher types have to do with the dynamics of the shaft packing or O to do with the dynamics of the shaft packing or O-

• ring and

ring and whether or not it moves as the seal wears. whether or not it moves as the seal wears.

• As the seal faces wear down over time, they must be closed to

As the seal faces wear down over time, they must be closed to compensate for lost face material. If the shaft O compensate for lost face material. If the shaft O-

• ring must move

ring must move when this compensation takes place, it is pushed forward by the when this compensation takes place, it is pushed forward by the components of the seal and by stuffing box pressure. If the seal components of the seal and by stuffing box pressure. If the seal is configured with a is configured with a “ “dynamic's dynamic's-

• ring of this type the seal is called

ring of this type the seal is called a pusher type. a pusher type.

Illustrated here is a Type TS8 Illustrated here is a Type TS8-

• 1, a common pusher seal. As the seal

1, a common pusher seal. As the seal springs and other pressures in the stuffing box are exerted on t springs and other pressures in the stuffing box are exerted on the seal, he seal, closure of the faces is achieved. closure of the faces is achieved.

As the softer carbon face wears down, the rotating face must mov As the softer carbon face wears down, the rotating face must move to e to maintain face closure. maintain face closure.

Minute particles of carbon and solids from the process liquid Minute particles of carbon and solids from the process liquid that migrate across the seal faces build up on the shaft that migrate across the seal faces build up on the shaft

This build up will ultimately cause the seal to This build up will ultimately cause the seal to “ “hang up" and in most hang up" and in most cases, failure will occur well before the seal is actually cases, failure will occur well before the seal is actually “ “worn out worn out” ”. .

Pusher VS. Non Pusher VS. Non Pusher VS. Non Pusher VS. Non-

• Pusher

Pusher Pusher Pusher

• There are seal types that have no dynamic O

There are seal types that have no dynamic O-

• rings. All
• rings. All

O O-

• rings are

rings are “ “static" and the seal components static" and the seal components compensate for face wear without compensate for face wear without “ “pushing" any pushing" any sealing points. sealing points.

• One of these types is called a

One of these types is called a “ “Bellows Seal Bellows Seal” ”. The . The bellows can be constructed of metal, rubber or PTFE. bellows can be constructed of metal, rubber or PTFE. The TS580B seen earlier in this presentation is an The TS580B seen earlier in this presentation is an “ “Elastomer (or Rubber) Bellows Seal Elastomer (or Rubber) Bellows Seal” ”. .

• Let

Let’ ’s consider the metal variety. s consider the metal variety.

Multi Spring Seals Multi Spring Seals Multi Spring Seals Multi Spring Seals

• Metal bellows are constructed by welding

Metal bellows are constructed by welding “ “leaflets" into a series of leaflets" into a series of “ “convolutions convolutions” ”. . This series of convolutions is referred to as the This series of convolutions is referred to as the “ “Bellows Core Bellows Core” ”. .

• The photo shown here is a shaft mounted

The photo shown here is a shaft mounted “ “TSMB TSMB-

• J01

J01” ”(Equivalent to John (Equivalent to John CraneType680). CraneType680).

• Now take a look at how a bellows seal compensates for face wear.

Now take a look at how a bellows seal compensates for face wear.

The bellows core expands to The bellows core expands to The bellows core expands to The bellows core expands to compensate for face wear. compensate for face wear. compensate for face wear. compensate for face wear.

Debris can build up without causing hang up. Debris can build up without causing hang up. This feature is probably the most notable This feature is probably the most notable selling point when comparing a bellows seal selling point when comparing a bellows seal to a pusher type seal. to a pusher type seal.

BALANCED VS. NON BALANCED VS. NON BALANCED VS. NON BALANCED VS. NON-

• BALANCED

BALANCED BALANCED BALANCED

• When speaking of

When speaking of “ “Balance" in reference to mechanical seals, we Balance" in reference to mechanical seals, we are not talking about Mechanical or Rotational Balance. Instead, are not talking about Mechanical or Rotational Balance. Instead, we are referring to Hydraulic Balance. we are referring to Hydraulic Balance.

• Since mechanical seals are subject to stuffing box pressure, thi

Since mechanical seals are subject to stuffing box pressure, this s pressure is utilized to achieve and maintain seal face closure i pressure is utilized to achieve and maintain seal face closure in a n a non non-

• balanced seal.

balanced seal.

• If stuffing box pressure is very high, typically over 100psi., t

If stuffing box pressure is very high, typically over 100psi., then hen the closing force may be too great to allow the the closing force may be too great to allow the “ “Boundary Layer Boundary Layer Liquid" that lubricates the faces to be sufficient and the faces Liquid" that lubricates the faces to be sufficient and the faces will will wear prematurely. wear prematurely.

• A balanced seal compensates for higher pressures by locating the

A balanced seal compensates for higher pressures by locating the seal faces such that stuffing box pressure has less effect on fa seal faces such that stuffing box pressure has less effect on face ce closure. closure.

Most metal bellows seals are balanced. Most metal bellows seals are balanced. Most metal bellows seals are balanced. Most metal bellows seals are balanced.

SINGLE VS. MULTIPLE SINGLE VS. MULTIPLE SINGLE VS. MULTIPLE SINGLE VS. MULTIPLE

• Most rotating equipment is equipped with a single seal.

Most rotating equipment is equipped with a single seal. This is what we have been examining thus far. Single This is what we have been examining thus far. Single shaft mounted seals, cartridges seals, balanced seals etc. shaft mounted seals, cartridges seals, balanced seals etc.

• Some applications call for a multiple seal configuration.

Some applications call for a multiple seal configuration. These are typically dual seal arrangements but can also These are typically dual seal arrangements but can also be a series of three or more. For our purposes we will be a series of three or more. For our purposes we will examine dual seal arrangements since that really covers examine dual seal arrangements since that really covers 99% of multiple seal applications. 99% of multiple seal applications.

DUAL SEALS DUAL SEALS DUAL SEALS DUAL SEALS

• Dual seals can be either pressurized or non

Dual seals can be either pressurized or non-

• pressurized. This is in reference to
• pressurized. This is in reference to

the artificial environment that is provided to exist the artificial environment that is provided to exist “ “between" the seals. between" the seals.

• A non

A non-

• pressurized dual seal, also known as a

pressurized dual seal, also known as a “ “Tandem" arrangement, means Tandem" arrangement, means that the inner, or primary seal is functioning as would a single that the inner, or primary seal is functioning as would a single

• seal. It is
• seal. It is

subject to stuffing box conditions, i.e. stuffing box pressure, subject to stuffing box conditions, i.e. stuffing box pressure, process liquid to process liquid to lubricate the faces and usually immersion of seal components in lubricate the faces and usually immersion of seal components in the process the process

• liquid. The secondary, or outside seal runs in a non
• liquid. The secondary, or outside seal runs in a non-
• pressurized

pressurized “ “Buffer" Buffer" liquid that is supplied from an outside source, typically a near liquid that is supplied from an outside source, typically a nearby supply tank. by supply tank.

• In a non

In a non-

• pressurized dual arrangement, the outside seal is primarily ther

pressurized dual arrangement, the outside seal is primarily there as a e as a containment device in the event that the inside or primary seal containment device in the event that the inside or primary seal is lost. A is lost. A “ “Back up" or safety mechanism if you will. Back up" or safety mechanism if you will.

• Let

Let’ ’s look at a Dual Cartridge Seal. s look at a Dual Cartridge Seal.

DUAL SEALS DUAL SEALS DUAL SEALS DUAL SEALS

• Since the outside or secondary seal runs in a non

Since the outside or secondary seal runs in a non-

• pressurized clean lubricating liquid, it will generally last

pressurized clean lubricating liquid, it will generally last for an extended period of time. When the inside or for an extended period of time. When the inside or primary seal fails, the leakage through the faces will be primary seal fails, the leakage through the faces will be contained by the secondary seal until the pump can be contained by the secondary seal until the pump can be shut down for seal replacement. shut down for seal replacement.

• Failure indication and shutdown devices can be

Failure indication and shutdown devices can be attached to the buffer supply so that the pump attached to the buffer supply so that the pump

• perators know when the primary seal has failed.
• perators know when the primary seal has failed.

DUAL SEALS DUAL SEALS DUAL SEALS DUAL SEALS

• When pumping volatile liquids, hazardous, corrosive, abrasive, e

When pumping volatile liquids, hazardous, corrosive, abrasive, etc. it is

• tc. it is

sometimes necessary to insure that the process liquid does not e sometimes necessary to insure that the process liquid does not enter the nter the atmosphere or the artificial environment created for the seal or atmosphere or the artificial environment created for the seal or even the seal even the seal faces. faces.

• Pressurizing the artificial environment, 20 to 30

Pressurizing the artificial environment, 20 to 30 psi

• psi. above the pump stuffing

. above the pump stuffing box pressure will prevent process liquid from crossing the prima box pressure will prevent process liquid from crossing the primary seal faces. ry seal faces. Instead, boundary layer film liquid is supplied to the primary s Instead, boundary layer film liquid is supplied to the primary seal by the eal by the artificial environment or artificial environment or “ “Barrier Barrier” ”. .

• The arrangement of seals can be the same as a non

The arrangement of seals can be the same as a non-

• pressurized in most cases.

pressurized in most cases. The difference is in how the seals perform. The difference is in how the seals perform.

• In a pressurized dual seal, the outboard or secondary has the to

In a pressurized dual seal, the outboard or secondary has the tougher job of ugher job of the two. It operates sealing high barrier pressure while the inb the two. It operates sealing high barrier pressure while the inboard or primary

• ard or primary

seal has clean lubricating liquid applied at differential pressu seal has clean lubricating liquid applied at differential pressure of only 20 to re of only 20 to 30 30 Psi Psi. .

• Now let

Now let’ ’s look at the environmental controls for operating dual seals. s look at the environmental controls for operating dual seals.

Pressurized gas in Pressurized Barrier fluid Plan 53 /7353 DISCHARGE SUCTION

DUAL SEALS DUAL SEALS DUAL SEALS DUAL SEALS

• There are many more types of environmental

There are many more types of environmental control arrangements that are discussed in other control arrangements that are discussed in other

• programs. This presentation simply covers the
• programs. This presentation simply covers the
• basics. For more detailed information on this
• basics. For more detailed information on this

topic, contact your supervisor or a Sealing topic, contact your supervisor or a Sealing Technologies Representative. Technologies Representative.

SPLIT SEALS SPLIT SEALS SPLIT SEALS SPLIT SEALS

• Some types of machinery are cumbersome to maintain. Large shafts

Some types of machinery are cumbersome to maintain. Large shafts, heavy , heavy components, and immovable drivers are some of these concerns. components, and immovable drivers are some of these concerns.

• Often, a typical mechanical seal is impractical to use by the na

Often, a typical mechanical seal is impractical to use by the nature of it ture of it’ ’s s installation requirements. installation requirements.

• In these cases it is frequently beneficial to use a Split Seal.

In these cases it is frequently beneficial to use a Split Seal.

• In a Split Seal, all components are literally cut or split in ha

In a Split Seal, all components are literally cut or split in half and they are lf and they are assembled onto the equipment without removal or disassembly of t assembled onto the equipment without removal or disassembly of the major he major equipment components. equipment components.

• Obviously, these seals are prone to leak more readily than non

Obviously, these seals are prone to leak more readily than non-

• split seals so

split seals so they are generally applied to processes where some leakage is ac they are generally applied to processes where some leakage is acceptable. ceptable. Even with some leakage, they will out perform common packing. Even with some leakage, they will out perform common packing.

• Split Seals are often used on mixers, agitators and large volume

Split Seals are often used on mixers, agitators and large volume, large shafted , large shafted pumps. pumps.

AUM AI 1800 SPLIT SEALS AUM AI 1800 SPLIT SEALS AUM AI 1800 SPLIT SEALS AUM AI 1800 SPLIT SEALS

• The Aum AI 1800 Seal is

The Aum AI 1800 Seal is split split radially radially as shown in as shown in this photo. this photo.

• All internal components

All internal components are also split and they are are also split and they are assembled onto the assembled onto the equipment shaft without equipment shaft without removing the equipment removing the equipment from it from it’ ’s operating position s operating position

• r tearing down it
• r tearing down it’

’s major s major components. components.

AUM AI 1800 SPLIT SEALS AUM AI 1800 SPLIT SEALS AUM AI 1800 SPLIT SEALS AUM AI 1800 SPLIT SEALS

SPLIT SEALS SPLIT SEALS SPLIT SEALS SPLIT SEALS

• Aside from the fact that the components are

Aside from the fact that the components are split, split seals operate virtually the same way split, split seals operate virtually the same way that most single cartridge or shaft mounted seals that most single cartridge or shaft mounted seals

• perate.
• perate.
• By nature of their split design, their application

By nature of their split design, their application is limited to lower pressures and non is limited to lower pressures and non-

• volatile

volatile liquids. liquids.

• Now let

Now let’ ’s move onto our final discussion topic, s move onto our final discussion topic, Gas Buffer Seals. Gas Buffer Seals.

GAS BUFFER SEALS GAS BUFFER SEALS GAS BUFFER SEALS GAS BUFFER SEALS

• The final seal type that we will look at during this

The final seal type that we will look at during this course is the Gas Buffer Seal. course is the Gas Buffer Seal.

• Gas Buffer Seals are the latest advancement in sealing

Gas Buffer Seals are the latest advancement in sealing

• technology. There are as many different types as there
• technology. There are as many different types as there

are Sealing Product Manufacturers. are Sealing Product Manufacturers.

• They were designed to facilitate capabilities similar to a

They were designed to facilitate capabilities similar to a dual seal without requiring elaborate environmental dual seal without requiring elaborate environmental controls or in the case of pressurized dual seals, without controls or in the case of pressurized dual seals, without liquid contamination of the process liquid. liquid contamination of the process liquid.

• We will briefly discuss the features of the Aum DGS

We will briefly discuss the features of the Aum DGS Seal. Seal.

The DGS Seal is a cartridge arrangement that contains a “Gas Lift-Off Seal". In a Gas Lift-Off seal, the faces theoretically never contact. There is no fluid film between the faces and since they never contact, there is no need for it.

DUAL GAS SEALS DUAL GAS SEALS

DGS DRY GAS SEALS DGS DRY GAS SEALS DGS DRY GAS SEALS DGS DRY GAS SEALS

Principals of Operation Principals of Operation Principals of Operation Principals of Operation

GAS BUFFER SEALS GAS BUFFER SEALS GAS BUFFER SEALS GAS BUFFER SEALS

• More detailed discussion of Gas Seals and their

application is available.

PROGRAM SUMMARY PROGRAM SUMMARY PROGRAM SUMMARY PROGRAM SUMMARY

Through this program we have looked at the basic principles and designs of mechanical seals.

• It is important to understand that detailed explanation of each

topic discussed here is available.

• Hopefully this presentation has helped to improve your

understanding of mechanical seals.

• Review this program again and as you have questions, comments
• r suggestions, ask your supervisor or a Sealing Technologies
• Representative. We want this training program to be as effective

as possible and your input is valuable.

• Thanks, and enjoy working with mechanical seals.

AI 108 AI 108

AI 107 AI 107

AI 109 AI 109

AI 110 , AI 110/C AI 110 , AI 110/C

AI 111 AI 111

AI20, AI25. AI 20/C, AI 25/C AI20, AI25. AI 20/C, AI 25/C

AI20B, AI25B, AI 20B/C. AI 25B/C AI20B, AI25B, AI 20B/C. AI 25B/C

AI 40, AI 45, AI 40/C, AI 45/C AI 40, AI 45, AI 40/C, AI 45/C

AI 50B, AI 55B, AI 50B/C, AI 55B/C AI 50B, AI 55B, AI 50B/C, AI 55B/C

AI 98, AI 98 /C AI 98, AI 98 /C

AI 80, AI 80/C AI 80, AI 80/C

AI 100 C AI 100 C

ATB, ATB ATB, ATB-

• R

R

MB00, MB05, MB 00/C, MB 05/C MB00, MB05, MB 00/C, MB 05/C

MBT and MBT/C MBT and MBT/C

AI 60B/C , AI 65 B/C AI 60B/C , AI 65 B/C

AI 600B/C , AI 605 B/C AI 600B/C , AI 605 B/C

AI 85 B/C AI 85 B/C

AI 70 , AI 75, AI 70/C, AI 75/C AI 70 , AI 75, AI 70/C, AI 75/C

AI 2000B , AI 2005B, AI 2000B/C. AI AI 2000B , AI 2005B, AI 2000B/C. AI 2005B/C 2005B/C Sun dyne seal Sun dyne seal

AI750BF/C Boiler Feed water seal AI750BF/C Boiler Feed water seal

AI 900BB/C , AI 950BB/C Balance AI 900BB/C , AI 950BB/C Balance Seal Seal

AI 98C/Dry Balance Seal AI 98C/Dry Balance Seal

AI 98C/Wet, AI 98C/Wet/B AI 98C/Wet, AI 98C/Wet/B

AI 98C/S/Wet AI 98C/S/Wet

AI 50/50/C, AI 55/55/C. AI AI 50/50/C, AI 55/55/C. AI 50/50/CB, AI 55/55/CB 50/50/CB, AI 55/55/CB

AI 50B/50B/C , AI 55B/55B/C , AI AI 50B/50B/C , AI 55B/55B/C , AI 50B/50B/CB, AI 55B/55B/CB 50B/50B/CB, AI 55B/55B/CB

UNDERSTANDING MECHANICAL SEALS PROGRAM END

Aum Industrial Seals Pvt. Ltd. Add: “Aum” House, E/18, Trimurti Society, New Sama Road, City : Vadodara. Zip/Postal Code: 390002 State: Gujarat. INDIA. Tel.: +91-265-6532064, +91-265-6451295 Fax.: +91-265-2761368 Mobile : +91-9825047896 Email: kalpit@aumindustrials.com aum_industrials@yahoo.com Skype: aumindustrials MSN : aumfluidsealing@hotmail.com www.aumindustrials.net www.aumindustrials.com www.aumindustrials.co.in