technical presentation - mechanical seals
DESCRIPTION
mechanical sealTRANSCRIPT
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1 April 11, 2023
ITT Flygt Mechanical Seals
• Introduction
• Basic seal technology
• ITT Flygt Sealing system
• Plug-In seal
• Seal material
• Qualification testing
• Service
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2 April 11, 2023
Pump anatomy
Motor
Hydraulics
Heart
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Static and Dynamic seals
Static seals: No relative movement between sealed surfaces
Dynamic seals: Relative movement between sealed surfaces
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4 April 11, 2023
Shaft seals
Stuffing box Lip seal
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5 April 11, 2023
Mechanical face seal basics
Spring Seal rings
Sealing interface
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6 April 11, 2023
Seal rating
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Leakage
P1
P0
P1P0
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Lubrication modes
Mixed film lubrication
Boundary lubrication
Seal ring
Lubrication film
No wear
High leakage
Low wear
Low leakage
High wear
No leakage
Full film lubrication
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9 April 11, 2023
Mechanical face seal
Spring Seal rings
Sealing interface
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10 April 11, 2023
Mechanical face Seal
Torque locks
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11 April 11, 2023
Leakage
h
Q~h3
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Leakage
Estimated daily leakage for a 50 mm seal with different lubrication film thickness
• 0.5 μm A couple of drops
• 1 μm Two table spoons
• 2 μm One glass
• 5 μm Half a bucket
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Flatness
0.00
06
max
Deviation from perfect flatness max 0.0006 mm =
2 light band of sodium light
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14 April 11, 2023
Flygt Sealing System
Inner sealBuffer fluid
Outer Seal
Impeller
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15 April 11, 2023
Sealing system in 3085
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16 April 11, 2023
Flygt Sealing System- New products
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17 April 11, 2023
Flygt Sealing System in 3153
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Positive closing force
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Buffer fluid
• Lubricates the seal faces
• Cools seal rings and other components
• Dilutes leakage to minimize risk of crystallization
• Doubles as coolant for new drive units.
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20 April 11, 2023
Spin-out
Wear caused by abrasive particles trapped by boundary current
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21 April 11, 2023
Spin-out
The spin out groove directs the abrasive particles out to the pump housing
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22 April 11, 2023
Plug-In seal
45 mm Plug-in seal
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Plug-in Seal
– Only one part to fit– Fast service– Protected seal faces– Correct mounting guaranteed– Same procedure for all seals– Correct and precise spring load– Pre tested– Cooling pump incorporated
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Plug-In seal series
Plug-in Seal
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Seal ring material
High Hardness
High Stiffness
Good Sliding Properties
High Thermal Conductivity
Low Thermal Expansion
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WCCR Corrosion resistant tungsten carbide. Standard material in Flygt seals
RSiC Silicon carbide. Optional material.
Al2O3
Aluminium Oxide.
CCarbon. Almost phased out. Only for inner seals in small products.
Seal ring material
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Rubber Material
Flourinated rubber (Viton) (FPM)
High temperature limit and good chemical resistance.Standard in most face seals due to high temperature limit.
Nitrile (NBR)
Good for most applications. Cost effective
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28 April 11, 2023
Other materials
Metals
Stainless steel AISI 329
Plastic
Only PPS . High temperature limit, strong and stable. Excellent chemical resistance.
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Qualification testing
Seal face materials and Seal designs are approved separately.
Materials are tested for tribological properties.
Seal designs are tested for mechanical performance and operational performance
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Approval of mechanical design properties
Lab rig tests
•Leakage
•Pressure limit
•Negative pressure opening level
•Duration and wear of seal components
•Power loss
•Dry running capability
•Media temperature limit
•Torque lock and torque transmission capability
Qualification testing
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31 April 11, 2023
Approval of operational performance
Field test in products
•Leakage
•Wear from abrasive pump media
•Clogging and wind-up of fibrous media
•“Snoring operation” capability
•Compatibility with product
Qualification testing
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Performance
Seal life is dependent of
• Leakrate
• Temperature
• Presence of abrasives
• Clogging
• Pressure
• Vibrations
• Dry running
• rpm
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performance
SEAL FAILURE
•High leakage
•Overheating
•Abrasive wear
•Thermo cracking
•Solid film build up
•Corrosion
•Incorrect mounting
•Mechanical failure
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34 April 11, 2023
Service
Do not remount mechanical face seals.
The seal rings will wear matching grooves into each other. If the seal is re mounted after service, the grooves will not match.
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Service
Pay attention to where to apply oil and where to apply grease
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Service
Keep hands and tools clean.
Microscopic particles left on the seal faces can cause leakage.
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37 April 11, 2023
Service
Clean shaft and check for damage that can cause the o-ring to leak
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38 April 11, 2023
Service
Lubricate stationary o-ring. Use oil if the seal ring lacks mechanical torque lock. Otherwise, use oil or grease.
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39 April 11, 2023
Service
Grease the shaft
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40 April 11, 2023
Service
Apply some DROPS of oil on the seal surface to prevent sticking
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Service
Place the rotating ring in place
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Service
Apply just 20 Newton of power on the tool when mounting the grip ring.
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Service
Check the clearance
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44 April 11, 2023
Service
Check the seal housing and shaft for defects.
Grease the shaft.
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Service
Oil the stationary O-rings (works as a torque lock)
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Service
Place the Plug in seal in place, be aware of the torque lock gets in right position
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47 April 11, 2023
Service
Mount the Retaining ring, be sure that it gets in to the groove in the shaft
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48 April 11, 2023
Service
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49 April 11, 2023
Service
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50 April 11, 2023
Service
Apply grease on the retaining ring to protect it from corrosion
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51 April 11, 2023
Run-out tolerances
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Service
Seals can run dry if the pump or mixer is filled with correct amount of buffer fluid.
Seals for 80mm shafts or larger should be limited to a few minutes of dry running to avoid overheating.
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53 April 11, 2023
Tightness check
ΔPmax=0,017*Po*t/V [bar]
ΔPmax=Pressure drop
Po=pressure in test object [bar]
t =test time [min]
V =volume of the test object [l]
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– No worries
Flygt mechanical seals