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MECHANICAL SEALSMECHANICAL SEALS
BY
UBAID ANWERUBAID ANWER
BY
UBAID ANWERUBAID ANWER
SEALSEAL
Seals are used to form a barrier between
two spaces. Generally one of these
spaces contains process fluid at a pr...
Mechanical SealMechanical Seal
• Mechanical seal is a device used to achieve
sealing of a rotating shaft of pump,
compress...
PUMP SHAFT
BEARINGSIMPELLER
MECHANICAL SEAL
A LIQUID IS SUPPLIED TO THE
PUMP “SUCTION”
AS THE PUMP SHAFT ROTATES CENTRIFUGAL
FORCE EXPELS THE LIQUID OUT FROM THE
IMPE...
ESSENTIAL ELEMENTS OF AESSENTIAL ELEMENTS OF A
MECHANICALMECHANICAL SEALSEAL
TYPES OF SEALSTYPES OF SEALS
 There are two main types of seals
1- STATIC SEALSSTATIC SEALS:-
In static seals, the seal a...
TYPES OF MECHANICAL SEALTYPES OF MECHANICAL SEAL
Mechanical seals are classified by two methods
1.By arrangement
2.By desi...
Cont.Cont.
SINGLESINGLE MECHANICALMECHANICAL SEALSEAL
• OUTSIDE
• INSIDE
MULTI MECHANICAL SEALSMULTI MECHANICAL SEALS
Multi mechanical seal are used where toxic, acidic or
flammable fluid are han...
ARRANGMENTS FORARRANGMENTS FOR
MULTI-MECHANICIAL SEALSMULTI-MECHANICIAL SEALS
Back to back Face to face
buffer mediaproduc...
BALANCE AND UNBALANCE SEALBALANCE AND UNBALANCE SEAL
Unbalance
Balance
• SINGLE SPRING
• MULTI SPRING
Spring
SINGLE & MULTI SPRING SEALSSINGLE & MULTI SPRING SEALS
PusherPusher typetype
Non-pusherNon-pusher sealseal
BELLOW TYPE SEALBELLOW TYPE SEAL
Sealing on the shaft
O.D. of the stationary
The seal gland to the
stuffing box
And finally, the seal faces
LEAKAGE POINTSL...
SEAL LIFESEAL LIFE
 The only way to tell if you are getting
satisfactory seal life is to look at the soft face.
 If ther...
MATERIALS FOR FACESMATERIALS FOR FACES
• Hard facesHard faces
a) Ceramic
b) Silicon Carbide
c) Tungsten Carbide
d) Plasma ...
Cooling of mechanical seal’s faces is essential
to prevent friction, heating & rapid wear of
faces.
There are standard coo...
TYPES OF COOLING FLUIDSTYPES OF COOLING FLUIDS
• BARRIER FLUIDBARRIER FLUID :-
If the fluid pressure between
the seals fac...
Cont.Cont.
Cooled faces Non-cooled faces
SLECTION OF SEALSLECTION OF SEAL
Here are some of the factors that need to be considered:
• Pressure & speed (PV limit = P...
Cont.Cont.
Selection of seal may be defined in one line as
““PAY ME NOW OR PAY ME LATER”PAY ME NOW OR PAY ME LATER”
Mechanical seal
Mechanical seal
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Mechanical seal

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Mechanical Seals their types,use and selection

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Mechanical seal

  1. 1. MECHANICAL SEALSMECHANICAL SEALS BY UBAID ANWERUBAID ANWER BY UBAID ANWERUBAID ANWER
  2. 2. SEALSEAL Seals are used to form a barrier between two spaces. Generally one of these spaces contains process fluid at a pressure higher/lower than atmospheric pressure.
  3. 3. Mechanical SealMechanical Seal • Mechanical seal is a device used to achieve sealing of a rotating shaft of pump, compressor, mixing vessels at its entry or exit to the casing. • It has two flat radial surfaces, one rotates with the shaft and the other is connected to the casing & became a stationary part.
  4. 4. PUMP SHAFT BEARINGSIMPELLER MECHANICAL SEAL
  5. 5. A LIQUID IS SUPPLIED TO THE PUMP “SUCTION” AS THE PUMP SHAFT ROTATES CENTRIFUGAL FORCE EXPELS THE LIQUID OUT FROM THE IMPELLER
  6. 6. ESSENTIAL ELEMENTS OF AESSENTIAL ELEMENTS OF A MECHANICALMECHANICAL SEALSEAL
  7. 7. TYPES OF SEALSTYPES OF SEALS  There are two main types of seals 1- STATIC SEALSSTATIC SEALS:- In static seals, the seal and the surface to be sealed off do not move against each other as O-ring seals, Gaskets. 2- DYNAMIC SEALSDYNAMIC SEALS:- In dynamic seals, the seal itself and the surface to be sealed off can reciprocate or rotate in relation to one other as mechanical seal, Packing, labyrinth & Lip Oil Seal.
  8. 8. TYPES OF MECHANICAL SEALTYPES OF MECHANICAL SEAL Mechanical seals are classified by two methods 1.By arrangement 2.By design
  9. 9. Cont.Cont.
  10. 10. SINGLESINGLE MECHANICALMECHANICAL SEALSEAL • OUTSIDE • INSIDE
  11. 11. MULTI MECHANICAL SEALSMULTI MECHANICAL SEALS Multi mechanical seal are used where toxic, acidic or flammable fluid are handled or in submersible machinery to ensure no leakage for extra safety
  12. 12. ARRANGMENTS FORARRANGMENTS FOR MULTI-MECHANICIAL SEALSMULTI-MECHANICIAL SEALS Back to back Face to face buffer mediaproduct Tandem
  13. 13. BALANCE AND UNBALANCE SEALBALANCE AND UNBALANCE SEAL Unbalance Balance
  14. 14. • SINGLE SPRING • MULTI SPRING Spring SINGLE & MULTI SPRING SEALSSINGLE & MULTI SPRING SEALS
  15. 15. PusherPusher typetype Non-pusherNon-pusher sealseal
  16. 16. BELLOW TYPE SEALBELLOW TYPE SEAL
  17. 17. Sealing on the shaft O.D. of the stationary The seal gland to the stuffing box And finally, the seal faces LEAKAGE POINTSLEAKAGE POINTS
  18. 18. SEAL LIFESEAL LIFE  The only way to tell if you are getting satisfactory seal life is to look at the soft face.  If there is still plenty of Carbon you did not get Good Life.  If most of the Carbon has worn away you got Good Life.
  19. 19. MATERIALS FOR FACESMATERIALS FOR FACES • Hard facesHard faces a) Ceramic b) Silicon Carbide c) Tungsten Carbide d) Plasma coatings e) GFPTFE (Glass Filled PTFE ) • Soft facesSoft faces a) Carbon b) Graphite c) Teflon
  20. 20. Cooling of mechanical seal’s faces is essential to prevent friction, heating & rapid wear of faces. There are standard cooling and flushing plans for mechanical seals as simple flush plan # 11 circulate pump’s discharge to mechanical seal , Plan # 23 is usually used on boiler feed water pump as per API standards COOLING OF SEALCOOLING OF SEAL
  21. 21. TYPES OF COOLING FLUIDSTYPES OF COOLING FLUIDS • BARRIER FLUIDBARRIER FLUID :- If the fluid pressure between the seals faces is higher than stuffing box pressure we call it barrier fluid. • BUFFER FLUIDBUFFER FLUID :- If the fluid pressure between the seals is lower than stuffing box pressure we call it buffer fluid
  22. 22. Cont.Cont. Cooled faces Non-cooled faces
  23. 23. SLECTION OF SEALSLECTION OF SEAL Here are some of the factors that need to be considered: • Pressure & speed (PV limit = Pressure x Velocity). • Temperature. • Fluid properties or characteristics. • Run out of the shaft. • Available space radial and axial. • Flushing/cooling arrangements, utilities in the plant. • Cost & maintenance • Seal life
  24. 24. Cont.Cont. Selection of seal may be defined in one line as ““PAY ME NOW OR PAY ME LATER”PAY ME NOW OR PAY ME LATER”

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