“Facing tomorrow’s - Wesmech Techwesmechtech.com/images/graham_gphe.pdf · “Facing...
Transcript of “Facing tomorrow’s - Wesmech Techwesmechtech.com/images/graham_gphe.pdf · “Facing...
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“Facing tomorrow’s challenges through today’s vision and leadership in engineering, quality and performance”
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Experience
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Engineering
Seventy years of historyOver thirty engineers on staff with an average of 15 years experience specializing in these fieldsCross trainingStructured technical development program
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Engineering
Heat Transfer Research Inc.Heat Exchange Institute
Surface CondenserSteam Jet EjectorLiquid Ring Pump
Tubular Exchanger Manufacturers AssociationElectric Power Research Inc.American Petroleum InstituteAir Conditioning & Refrigeration Institute
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Research & Development
Continuously pursue enhancement of existing or the development of new products. Focus is on market driven requirements.
– Heat transfer– Ejector– Liquid Ring Pump– Dry Vacuum Pump
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Manufacturing
Manufacturing in Batavia,N.Y.
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Quality
ANSI/ISO/ASQC Q9001 compliant planASME Section VIII, Div 1 programChinese Pressure Vessel Safety LicenseGQST
“Quality is our strategy for assuring long term growth and profitability. We will strive for continuous improvement and total customer satisfaction.”
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Products
Heat transfer– Plate heat exchangers – Heliflow– Water Heaters– Clean Steam Generators– Desuperheaters– Cryogenic vaporizers– Vent condensers– Seal coolers– High pressure HEX’s
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Products
Vacuum–Surface condensers–Ejector systems–Liquid ring pumps–Hybrid systems–Process condensers–Barometric condensers –Atmospheric relief valves–Dry vacuum pumps
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Factors in Choosing a PHE
Heat transfer rate / efficiencyDesign pressureDesign TemperatureTemperature CrossingCorrosive FluidsParticles in FluidsViscous fluids or slurriesCleanability
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Graham GPHE’s
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Graham Corporation
“ Graham has your solution on a plate”
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How it Works
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How it Works
High turbulenceTrue counter current flow pathLow foulingHighest heat transfer coefficients
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High Efficiency
Surface Area = QU x LMTD
Q = Heat transfer dutyU = Overall heat transfer coefficientLMTD = Log mean temperature difference
= ( Thot in – Tcold out ) – ( Thot out – Tcold in )ln ( Thot in – Tcold out )
( Thot out – Tcold in )
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Heat Transfer - Shell & Tube
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Heat Transfer Coefficients
Application Shell & Tube PlateWater / water 250 1500Steam / water 350 1500SAE 30 Oil / water 60 150#6 Fuel Oil / water 20 5050% E.G. / water 150 1000
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Flow Arrangements - PHE
Port Area Inlet
Void AreaDistributionArea
Main Heat Transfer Area
Leakage Groove
Distribution Area
Outlet
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Flow Arrangements - PHE
Single PassSingle Pass
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Flow Arrangements - PHE
Multi-Pass
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Corrugation Types - PHE
“H”
High
Theta
60 deg
“L”
Low
Theta
30 deg
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Flow Arrangements - PHE
H – H H – L L - L
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Heat Transfer Rate
Heat transfer coeffecientsApplication S & T PlateOil cooler 100-150 250-300Water/Water 400-500 1400-1500Plate heat exchanger smallerLess volume for plate heat exchanger
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PHE Benefits
HIGH HEATTRANSFER
COEFFICIENTS
COMPACTDESIGN
LOWERVOLUME
LESSMATERIAL
LOWESTINSTALLEDCOST!
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Factors in Choosing a PHE
Design PressureDesign TemperatureTemperature CrossingCorrosive FluidsParticles in fluidsViscous fluids or slurriesCleanability
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Counter Current Flow
LMTD
PRICE
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PHE Benefits
COUNTER CURRENT
FLOWCLOSERAPPROACHTEMPERATURE
TEMPERATURECROSSING
GREATERHEAT
RECOVERY
LOWERENERGYCOSTS!
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Corrosive Fluids
Cooling water quality: 304SS=50 ppm Cl, 316SS=150 ppm Cl and Titanium > 150 ppm ClAlmost any plate material availableCompressed fiber, PTFE, semi-welded, all-welded and brazed are viable solutions
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Particles in the Fluids
What is the size and concentration of the particles?– Standard plates can pass particles that
are 75% of the free channel– Provide an appropriate strainer in the
inlet line to the heat exchanger– Fluid with particles should flow
downward– Provide back flushing system to
periodically clean the unit
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Fouling Factors
Application of shell & tube type fouling factors to PHE’s– S & T water cooler has a UC of 300 and by adding
0.001ff results in a UD of 230 or 13% excess surface– For the same application a PHE would have a UC of
1500 and by adding 0.001ff results in a UD of 600 or 60% excess surface
– The PHE is heavily penalized despite having turbulent flow on both sides
– Fouling in a PHE will actually increase as plates are added to meet this ff and velocities between the plates are substantially reduced
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Fouling Factors
If a concern the normal procedure is to add 10% excess surface to the heat exchanger selectionFor constantly fouling services a Clean In Place system may be used or a stand by unit may be offeredHeavily fouled units can be easily taken apart for mechanical and/or chemical cleaning of the plates
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PHE Components
Carrying Bar
Tightening Bolts
Plates / Plate Pack
Rear Support Column
Guiding Bar
Movable Cover
Connection Port
Fixed Cover
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PHE Benefits
ALLBOLTED
CONSTRUCTION
MECHANICALCLEANINGPOSSIBLE
EASYSERVICING
LOWERMAINTENANCECOSTS!!
REDESIGNCAPABLITY
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Features & Benefits
ADVANTAGE
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Advantage: The Plates
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Plate Geometry
Superior fluid distribution below port areas for even flow distribution & better heat transfer
Neck area below port is designed for low pressure drop and low velocity for errosion protection
Heat transfer is optimized in main area with tighter plate patterns resulting in less dead spots
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Plate Geometry
OLDNEW
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Plate Depth
Plate thicknessMinimum tightening dimensionPressure ratingHeat transfer rate Plate applications
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Plate Depth
0.078” Minimum
0.15” Traditional
0.625” Wide Gap
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Plate Geometry
“H” high and “L” low style plates
Two depths available for four sizes
Options to optimize any heat transfer application
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Plate Geometry
Units with port sizes 4” and smaller use a unique interlocking corner allignment system
Guarantees proper sealing of the heat exchanger
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Plate Geometry
Units with port sizes 6” and larger use a unique five point allignment system
Guarantees proper sealing of the heat exchanger while allowing for easy assembly and disassembly
“Plate cannot
shift in any
direction.”
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Plates
Plate Materials- 304SS, 316SS, SMO 254- Titanium, Titanium-Pd- Hastelloy, Incoloy, Nickel
Plate Patterns- H ( High-theta plate )- L ( Low-theta plate )
Plate Thicknesses- 0.4,0.5, 0.6, 0.7 mm
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Double Wall Plate Geometry
Double wall plates protect one fluid from contaminating the other if a plate fails
Available in four models
Gasket Double Wall Plate
Air GapPotable Water
Boiler Water Plate Failure
Fluid leaks to
the outside.
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Advantage: New Plate Designs
In house design & tool manufacturing
Two new models in last year
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Graham Advantage: Plates
Many different plate styles: 2.5 to 11 mm deep
Parallel flow vs. diagonal
Optimum distribution area – No stagnant areas
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Graham Advantage: Plates
Five point allignment system
Corner allignment systemOne time plate pressing/formingFull support of gasket
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All those gaskets!!
Heat exchanger life expectency of gaskets is 5 years based on published dataGlueless gaskets make replacing them a snapImprovements in gasket design, both in shape and material, result in higher design temperatures and pressures and longer life
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Advantage: Gaskets
Gasket failures always are to the outside of the heat exchanger
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Gaskets
GLUELESS GLUED
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Gasket sealing
Ridged gaskets
Higher sealing pressure
Better sealing of heat exchanger
Longer life and reliability
Graham Others
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Gasket Materials
Nitrile ( Nbr )- oil, water, food & beverage service- 285 degF Max. operating temperature
EPDM- hot water, steam, dilute acid service- 338 degF Max. operating temperature
Viton G- aggressive chemicals, oil, fat service
- 320 degF Max. operating temp
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Advantage: Frame Construction
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Frame Features
Use thicker headers and larger diameter tightening bolts to minimize deflection and optimize sealing and pressure rating capabilities
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Frame Features
ASME VIII using FEAAll bolted constructionZinc plated tightening boltsStainless steel or zinc coated guide & carry bars
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Frame Features
Safety shield on every unit
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Connection Styles
Standard
Optional
NPT Threaded NPT Threaded
W/ Alloy Nozzle
ANSI Studded ANSI Studded
W/ Alloy Liner
ANSI Flanged Sanitary Ferrule
Quick Disconnect
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Frame Features
Easily disassembled for cleaningExpandable for future capabilitiesCompact design
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Frame Features
Many different sizes1” to 14” connection sizeUp tp 450 psi working pressure
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Optional Construction
Rigid insulation with drip tray
Cloth insulation
All removeable
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PHE Certifications
ASME Section VIII- Possible Section III
EPRI – Specification for replacing S & T’s with PHE’s in nuclear power plants
HEI – Heat Exchange Institute
API – American Petroleum Institute
Internationally: Chinese, Korean & others
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ARI
Standard 400
Liquid to Liquid Heat Exchangers
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Installations
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Installations
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Installations
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Installations
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Graham Advantage
Engineering strength
Software programs to produce optimum heat exchanger selections
Proven installations
Proprietary now-how
100% U.S.A. manufacture including gaskets
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Dry Vacuum Pump
Steam Jet Ejectors
Liquid Ring Pump System
Turbine Exhaust Condenser
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Heliflow Heat Exchanger
Plate & Frame Heat Exchanger
Instantaneous Hot Water Heater
Multimedia Presentation “Vacworks”
Steam Generator
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THE END