Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.
-
Upload
alexina-roberts -
Category
Documents
-
view
364 -
download
6
Transcript of Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.
![Page 1: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/1.jpg)
Sanitary Plate Heat Exchangers
Working Principle of a Plate Heat Exchanger
![Page 2: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/2.jpg)
© Alfa Laval Slide 2 www.alfalaval.com
PHE - Main ComponentsCarrying bar
Pressureplate
Plate packTightening bolts
Frame plate
![Page 3: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/3.jpg)
© Alfa Laval Slide 3 www.alfalaval.com
PHE - Dismantling
Click on animation to play again
![Page 4: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/4.jpg)
© Alfa Laval Slide 4 www.alfalaval.com
Plate Heat Exchanger
360˚ turn
![Page 5: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/5.jpg)
© Alfa Laval Slide 5 www.alfalaval.com
Plate Heat Exchanger
inside
![Page 6: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/6.jpg)
© Alfa Laval Slide 6 www.alfalaval.com
Cold in
Hot out
Hot in
Cold out
Plate Pack - Example Single Pass
End
Pla
te I
I
End
Pla
te I
Cha
nnel
pla
tes
Only 2 plates that do not transfer heat - the end plates
![Page 7: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/7.jpg)
© Alfa Laval Slide 7 www.alfalaval.com
Pass/Channel: Hot Side 2 x 4
Cold Side 2 x 4
Cold in
Hot outHot in
Cold out
www.alfalaval.com
Plate Pack – Example Multipass
![Page 8: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/8.jpg)
© Alfa Laval Slide 8 www.alfalaval.com
In the Dairy
• Milk pasteurization
• Cream pasteurization
• Cultured milk treatment
• UHT
• Cheese milk heat treatment
• Ice cream mix heat treatment
Applications
![Page 9: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/9.jpg)
© Alfa Laval Slide 9 www.alfalaval.com
Pasteurization
ApplicationsIP
![Page 10: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/10.jpg)
© Alfa Laval Slide 10 www.alfalaval.com
Frame - purposeFrame - purpose
• Holds the plates together
• Supports the plates (load / pressure)
• Base for connections (inlet / outlet for media)
![Page 11: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/11.jpg)
© Alfa Laval Slide 11 www.alfalaval.com
Frame - TypesFrame - Types
• Industrial types (mild steel, painted):
FM, FG, FD
Only used for utility (water heaters/coolers)
• Hygienic types (stainless steel):
Base, FMC, FHC, FRM, FRH, FRD, RM
Normally used in the Food industry
![Page 12: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/12.jpg)
© Alfa Laval Slide 12 www.alfalaval.com
• Unique 5-point alignment system
– Provides exact positioning of the plates horizontally and vertically
– Ensures good sealing throughout the plate pack
Carrying bar
Guiding bar
Plate
Frame - > M15 and FrontLine™
![Page 13: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/13.jpg)
© Alfa Laval Slide 13 www.alfalaval.com
FrontLine™FrontLine™
• Solid stainless steel frame and pressure plates
• Cleaner since there is no risk of cracks in cladding allowing dirt and bacteria build-up
• More durable since there is no internal mild steel structure that can corrode
![Page 14: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/14.jpg)
© Alfa Laval Slide 14 www.alfalaval.com
• Stainless steel bolts with ball bearing washers
• Reduces service time
FrontLine™FrontLine™
![Page 15: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/15.jpg)
© Alfa Laval Slide 15 www.alfalaval.com
• Bolt-in corners at connection plates
• Easy to modify for new duties and applications
FrontLine™FrontLine™
![Page 16: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/16.jpg)
© Alfa Laval Slide 16 www.alfalaval.com
Other Options• 3A polished fittings
• Connections in Titanium
• High legs
• Protection sheets
• Stainless steel bolt covers
FrontLine™FrontLine™
![Page 17: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/17.jpg)
© Alfa Laval Slide 17 www.alfalaval.com
Hygienic Frame - CHygienic Frame - Connection Plate
• Connection plates are used in multi–section units when one or more fluid must enter or leave the PHE at a location other than the frame or pressure plate.
• Available as standard for types with hygienic frames – Front 10, Front 8, Front 6, Clip 3, M15, M10, M6, TL10B
![Page 18: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/18.jpg)
© Alfa Laval Slide 18 www.alfalaval.com
Plates - Plates - Purpose
• Create channels for the liquids (corrugation).
• Create turbulence for the flow
• Provides the heat transfer from one media to the other media.
![Page 19: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/19.jpg)
© Alfa Laval Slide 19 www.alfalaval.com
• Plate pattern (L , M and H )
• Pressing depth
• Clip and M plates
B plates
• Physical length and width of plate
• Increase the number of passes
The Channel Plate Construction
www.alfalaval.com
![Page 20: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/20.jpg)
© Alfa Laval Slide 20 www.alfalaval.com
PlatesPlates
Distribution area
Inlet / outlet Media 1
Heat transfer area
Distribution area
Inlet / outlet Media 1Inlet / outlet Media 2
Inlet / outlet Media 2
Fully supported gasket groove
![Page 21: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/21.jpg)
© Alfa Laval Slide 21 www.alfalaval.com
Plate - Distribution Area
• Chocolate pattern
– Distributes flow evenly over the plate
– Same P for distance A and B
– Uses a minimum of P for distribution
– Gives more P for efficient heat transfer
– Avoids dead spots in the far corner
A
B
![Page 22: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/22.jpg)
© Alfa Laval Slide 22 www.alfalaval.com
Corner Guidance
• First alignment made by the carrying & guiding bar
• Corner guidance locks the plates in position and fine-tunes the alignment
![Page 23: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/23.jpg)
© Alfa Laval Slide 23 www.alfalaval.com
Plate - Corrugation and Channels
L: Low theta H: High theta
• We have two plate corrugations (L and H)
L + L = L channels L + H = M channels H + H = H channels
• These form three different channels (L, M and H)
• We choose between L, M and H channels
• Tailor-made for the specific duty
![Page 24: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/24.jpg)
© Alfa Laval Slide 24 www.alfalaval.com
Plate - corrugation and channels
Advantages
• Efficient heat transfer
• High wall shear stress
• Variable thermal length
• Strong construction
Benefits
• Increased heat recovery
• Low fouling
• Optimal design
• Insensitive to vibration
Low turbulence& pressure drop
L + L = L channels
Medium turbulence& pressure drop
L + H = M channels
High turbulence & pressure drop
H + H = H channels
![Page 25: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/25.jpg)
© Alfa Laval Slide 25 www.alfalaval.com
The Plate Corrugation hastwo Functions:
Mechanical – to make the plate rigid and provide interplate support points.
Flow dynamic – to promote interplate fluid turbulence for high efficiency.
Compact
![Page 26: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/26.jpg)
© Alfa Laval Slide 26 www.alfalaval.com
• Herring bone
• Contact points
– Mechanical Strength
• Flow pattern
– Cork screw
– High turbulence
Plate Pattern
![Page 27: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/27.jpg)
© Alfa Laval Slide 27 www.alfalaval.com
The Front Standard Plate
• High and Low theta plates
• Optimize the design for both thermal and product considerations
![Page 28: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/28.jpg)
© Alfa Laval Slide 28 www.alfalaval.com
The Front Standard Plate
• Deeper pressing depthDeeper pressing depth
• Ability to handle small Ability to handle small particulatesparticulates
![Page 29: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/29.jpg)
© Alfa Laval Slide 29 www.alfalaval.com
The Front Standard Plate • Wide corrugationsWide corrugations
• Longer run times at same rate Longer run times at same rate of foulingof fouling
Other unit
Clip plate
![Page 30: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/30.jpg)
© Alfa Laval Slide 30 www.alfalaval.com
The Front Standard Plate
• Five point alignment systemFive point alignment system
• Ensures plate and gasket are Ensures plate and gasket are aligned during take-upaligned during take-up
• Reinforced for frequent Reinforced for frequent opening and closingopening and closing
![Page 31: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/31.jpg)
© Alfa Laval Slide 31 www.alfalaval.com
The Front Standard Plate
• Long & narrow geometryLong & narrow geometry
• Even flow & heat transfer Even flow & heat transfer across plate surfaceacross plate surface
• Low CIP flow ratesLow CIP flow rates
![Page 32: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/32.jpg)
© Alfa Laval Slide 32 www.alfalaval.com
The Front Standard Plate
• Flow distribution areaFlow distribution area
• No “dead spots” for better No “dead spots” for better hygienehygiene
• Promotes even flow across Promotes even flow across plate surfaceplate surface
![Page 33: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/33.jpg)
© Alfa Laval Slide 33 www.alfalaval.com
The Front Standard Plate
• Smaller port holes, tubing Smaller port holes, tubing dimensionsdimensions
• Lower CIP flow rates, better Lower CIP flow rates, better hygienehygiene
![Page 34: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/34.jpg)
© Alfa Laval Slide 34 www.alfalaval.com
The Front Standard Plate
• Bright annealed finish
• Easier to clean
• Easier to inspect
• Higher corrosion resistance
![Page 35: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/35.jpg)
© Alfa Laval Slide 35 www.alfalaval.com
Sanitary PHE Plate DesignSanitary PHE Plate DesignSanitary PHE Plate DesignSanitary PHE Plate Design
• Plate geometry (long & narrow)Plate geometry (long & narrow)
• Port holesPort holes
• Distribution areaDistribution area
• Stagnant areasStagnant areas
• Pressing depth and corrugationPressing depth and corrugation
• Plate surfacePlate surface
•……to eliminate any risk for to eliminate any risk for infection in pasteurisersinfection in pasteurisers
• Plate geometry (long & narrow)Plate geometry (long & narrow)
• Port holesPort holes
• Distribution areaDistribution area
• Stagnant areasStagnant areas
• Pressing depth and corrugationPressing depth and corrugation
• Plate surfacePlate surface
•……to eliminate any risk for to eliminate any risk for infection in pasteurisersinfection in pasteurisers
Front standard plate
Other plate
![Page 36: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/36.jpg)
© Alfa Laval Slide 36 www.alfalaval.com
Plate Pack Assembly
• Channel Plate
• End Plate II(gasket against frame)
• End plate I(metal against frame)
• Turn Plate
• Transition Plate
• Partition Plate
• Connection PlateEnd plate II
End plate I
![Page 37: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/37.jpg)
© Alfa Laval Slide 37 www.alfalaval.com
Plate Pack - Channel Plates
• Channel Plates are the heat transfer plates
• They dominate the plate pack
• Most frequently with 4 holes punched
• Alternating A / B (turned 180 degrees)
![Page 38: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/38.jpg)
© Alfa Laval Slide 38 www.alfalaval.com
Plate Pack - End Plate I• In single pass,
– Stops fluid at the end of the plate pack
– Last plate at carbon steel pressure plate
– No port holes are punched
Sin
gle
pass
Exa
mpl
e,
Mul
ti pa
ss• In multi-pass,
– Stops one fluid as it reaches the end
– Allows other to flow into the plate pack
– 2nd last plate in the plate pack (transition plate behind it)
– Hole combination as per pass arrangement
• Normal gasket as on channel plates
• Usually in 0.6 mm with high-theta pattern
![Page 39: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/39.jpg)
© Alfa Laval Slide 39 www.alfalaval.com
Plate Pack - Turning Plate
• Used in multi-pass
• 1, 2 or 3 port can be un-punched
• Change the flow direction of one or both fluids in between the passes
• Normal channel plate gasket
![Page 40: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/40.jpg)
© Alfa Laval Slide 40 www.alfalaval.com
Number of plates depends on:
• Flow rates
• Permitted pressure drops
• Temperature program
• Size & design of plates
• Heat recovery
• Material & thickness of plates
• Physical properties
The Construction
www.alfalaval.com
![Page 41: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/41.jpg)
© Alfa Laval Slide 41 www.alfalaval.com
• Plates are totally uniform
• Uniform metal-to-metal contacts points
• Stronger plates that can handle
– High pressure
– High differential pressure
– Vibrations
Single Step Pressing
Plate Pressing
![Page 42: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/42.jpg)
© Alfa Laval Slide 42 www.alfalaval.com
Plate - Pressing Depth
Performance
Pressing depth
• pressure drop• heat recovery• compact design
• gentle product treatment• special products• clogging problems
Thermal Product
• Alfa Laval has a range of pressing depths from 1.5 mm to 11 mm for optimal solution to any duty
There is no good and no bad pressing depth. Just different ones to fit various duties
![Page 43: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/43.jpg)
© Alfa Laval Slide 43 www.alfalaval.com
Plate - Parallel vs. Diagonal Flow
Parallel flow advantages
• One plate & one gasket
– Identical plates in plate pack
– Rotated 180º to achieve both sides
• Less spares required
• Fully supported diagonal
– Higher design pressure or thinner plate material
• No crossing of nozzles
180º
![Page 44: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/44.jpg)
© Alfa Laval Slide 44 www.alfalaval.com
Plate - Materials• Standard materials and thicknesses
• AISI 304 (stainless steel)
- Usually 0.4 or 0.5 mm thick
- Cheapest possible solution
• AISI 316 (stainless steel) - 0.5 and 0.6 mm thick
- Some with thicker plates (high-pressure applications)
• 254 SMO (high-alloy stainless steel)
- Usually in 0.6 mm to allow stock-keeping
• Titanium - 0.5 and 0.6 mm thick
- Some with thicker plates (high-pressure applications)
- Some with 0.4 mm (low-pressure applications)
• Alloy C-276 (Nickel alloy)
- Usually in 0.6 mm to allow stock-keeping
100%
115%
250%
300%
600%
RelativePrice
![Page 45: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/45.jpg)
© Alfa Laval Slide 45 www.alfalaval.com
Gaskets - PurposeGaskets - Purpose
• The purpose of the gaskets is to seal between the channel plates and between plates and the frame parts (connecting plate).
• Are the only wear part (the ageing of rubber).
![Page 46: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/46.jpg)
© Alfa Laval Slide 46 www.alfalaval.com
The Front Standard Plate
• Glueless gasket
• Gasket & plate work together as a system to replace adhesives
• Less downtime, plates can be re-gasketed in frame
![Page 47: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/47.jpg)
© Alfa Laval Slide 47 www.alfalaval.com
The Front Standard Plate
• Deep gasket groove
• Protection of gasket from elements
• Higher pressure ratings
• Ensures gasket remains on plate during opening
![Page 48: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/48.jpg)
© Alfa Laval Slide 48 www.alfalaval.com
The Front Standard Plate
• Thicker Gasket
• Better resistance to thermal, pressure and CIP cycles
• Longer gasket life
![Page 49: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/49.jpg)
© Alfa Laval Slide 49 www.alfalaval.com
The Front Standard Plate
• Twin gasket w/ leak detect ports
• No chance for cross contamination across gaskets at port holes
![Page 50: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/50.jpg)
© Alfa Laval Slide 50 www.alfalaval.com
Gasket - double sealing system
Special venting ports are an integral part of the gasket design to prevent cross contamination
If the gasket fails Leakage is detected on the outside
![Page 51: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/51.jpg)
© Alfa Laval Slide 51 www.alfalaval.com
Gaskets - StandardGaskets - Standard
Nitrile:
• NBRP = (performance) up to 110°C, Food grade
• NBRB = (base) inexpensive, lower temperature, Food grade
• NBRHTF = (high temperature) Food grade
• NBRFF = upgrade of NBRHTF Food grade
Ethylene Propylene rubber:
• EPDMC = clip-on/non-glued. High temperature (non food)
• EPDMF = Food grade (FDA)
• EPDFF = upgrade of EPDMF Food grade (FDA)
(Not resistant to oil and fat)
![Page 52: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/52.jpg)
© Alfa Laval Slide 52 www.alfalaval.com
Gasket - Profile and Groove
Profile
OtherAlfa Laval
Groove
Higher sealing pressure
Risk of leakage.
Full support to gasket
Openings. Risk of gasket blow-out.
The difference is lifetime and reliability
![Page 53: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/53.jpg)
© Alfa Laval Slide 53 www.alfalaval.com
Gasket - Sealing Lifetime
Product
• Gasket material
• Fastening
– Glue or glue-free
– Type of glue
• Gasket geometry
• Gasket groove
• Alignment of plate pack
Duty
• Operating temperature
• Operating pressure
• Media
• Type of operation continuous / cyclic
• Cleaning methods & chemicals
• Opening frequency
Life time!
![Page 54: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/54.jpg)
© Alfa Laval Slide 54 www.alfalaval.com
Gasket - Sealing Lifetime
• Maximum temperature in CAS and product manual (PMP), for example,
– NBR up to 130ºC
– EPDM up to 160ºC
Gives about 1 year lifetime When no chemical attack takes place
• Rule of thumb:
– 10ºC lower than max temperature 2 years lifetime
– 10ºC above the max temperature 6 months lifetime
![Page 55: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/55.jpg)
© Alfa Laval Slide 55 www.alfalaval.com
PMP - Pressure/Temperature
• A P/T graph can be made from data sheet information showing the expected performance of the plate & gasket– The design P/T should be inside the performance area– If P/T is on the line 1 year gasket lifetime– If P/T is outside Cannot guarantee the performance– If the gasket is chemically attacked more aspects to be added
0
5
10
15
20
25
0 50 100 150
Temperature (°C)
Pre
ssu
re (
bar
g)
Performance area
Limited by the max design pressure for the plate
Gasket lifetime limited by the max temperature
Gasket lifetime limited by a combination of pressure and temperature
![Page 56: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/56.jpg)
© Alfa Laval Slide 56 www.alfalaval.com
PMP - Pressure/Temperature
• The data is found in the data sheet
– In the gasket performance table
• T(T) = The maximum allowed operating temperature. Above this temperature the gasket will last less than one year.
• T(P) = Recommended temperature at max pressure. Higher pressure More strain on the gasket We cannot allow the max temperature
– In the plate performance table
• P(P) = Maximum design pressure for the plate.Above this pressure the plate will deform.
• P(T) = Recommended max operating pressure at max operating temperature.
Higher pressure Softer gasket We cannot allow the max pressure
![Page 57: Sanitary Plate Heat Exchangers Working Principle of a Plate Heat Exchanger.](https://reader035.fdocuments.net/reader035/viewer/2022081415/56649d6e5503460f94a4f923/html5/thumbnails/57.jpg)
© Alfa Laval Slide 57 www.alfalaval.com