Download - Vacuum Ejectors
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EDS 2005/VE-1
Vacuum Ejectors
Training Services
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EDS 2005/VE-2
EDS-R00-3885
Steam Jet Ejector
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Lobe Type Positive DisplacementVacuum Pump
EDS-R00-3855
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Liquid Ring Pump Operation
EDS-R00-3856
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Liquid Ring
EDS-R00-3857
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EDS 2005/VE-6
Liquid Ring Pump Pressure Range
EDS-R00-3858
Single Stage
Two Stage
Ejector/Liquid Ring Combination
Two Stage Liquid Ring - Oil Sealant
1000
TORR
TORR100 50 10 5 1
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EDS 2005/VE-7
Liquid Ring Vacuum Pump
EDS-R00-3859
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Advantages of Ejectors Over OtherTypes of Vacuum Pumps
1. Low first cost
2. Economy of operation
3. Simplicity
4. Compactness
5. Durability
6. Dependability
7. Low installation cost
8. Low maintenance cost
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EDS 2005/VE-9
Ejectors CanHandle Corrosive,Toxic Fluids . . .
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EDS 2005/VE-10
EDS-R00-3861
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EDS 2005/VE-11
Two Stage Condensing with DirectContact Intercondenser
EDS-R00-3860
FirstStage
Second
Stage
Direct
Contact
Condenser
Cooling Water
and Condensate
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EDS 2005/VE-12
Steam Jet Ejectors
Operation
Control
Application
Utilities Consumption System
Problems
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Operation
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EDS 2005/VE-14
Ejector Operation
EDS-R00-3862
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Ejector Characteristics
EDS-R00-3863
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EDS 2005/VE-17
Mollier ChartSaturated Steam Motive and Vapor Suction Fluid
EDS-R00-3864
P1 (Motive Pressure)
P3 (Suction Pressure)P5 (Discharge Pressure)
Enth
alpy
Entropy
P1
1P5
5 P3
3
4
2
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EDS 2005/VE-18
Stage Compression Ratio =
Compression Ratio is =
Ejector Discharge Fluid
Absolute Pressure
Ejector Load FluidAbsolute Pressure
~< 2.0 Non Critical Design
~> 2.0 Critical Design
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EDS 2005/VE-19
A Critical Design indicates that the velocity in
the mixing section of the ejector is supersonic
A Critical Design -
Has a standing wave
Has a relatively narrow range of operation
Is sensitive to the location of the nozzle relative
to the diffuser and the diffuser geometry
Is used for most process applications
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Ejector Characteristics
EDS-R00-3863
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Ejector Performance Curve
EDS-R00-3865
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Effect of Nozzle Positionon Performance Curve
EDS-R00-3866
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Control
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Ejectors Operate in Parallelfor Step Type Control and
for Sparing . . .
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Control by Throttling Inlet Vapor Line
EDS-R00-3867
Receiver
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Control by Additional Load Gas Throttling
EDS-R00-3868
Receiver
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Control by Recycling Interstage FlowBack to Suction
EDS-R00-3869
Receiver
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Application
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Ejector Application Information
EDS-R00-3870
1 micron 10 microns 100 microns 1 mm 10 mm 100 mm 1000 mm
Suction Pressure (Microns and mm Hg ABS)
3 Stage
1 mm to 25 mm
4 Stage
150 microns to 4 mm
5 Stage
20 to 300 microns
6 stage
2 to 100 microns
1 atmos.
2 Stage
10 mm to 100 mm
1 stage
75 mm to atmos.
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Single Stage ~ 50-75 mm Hg ABS
EDS-R00-3871
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Ejectors in Series GiveIncreased Compression
Ratio Capability . . .
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Two Stage ~ 10-100 mm Hg ABS
EDS-R00-3872
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EDS-R00-3873
Three Stage ~ 1-25 mm Hg ABS
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Sometimes a Booster isUsed for High
Compression Ratios . . .
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Four Stage ~ 150 Microns - 4 mm Hg ABS(1 Micron = 1/1000 mm)
EDS-R00-3874
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For Suction Pressure Below 4 to 5 mmHg ABS Ice Will Form on Steam -
Jet Ejector Nozzle
EDS-R00-3875
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Steam Jet Ejectors
Operation
Control
Application
Utilities Consumption
System
Problems
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Utilities Consumption
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EDS 2005/VE-40
EDS-R00-3876
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Ejector Performance Curve Showing theEffect of Changes in Mol-wt
EDS-R00-3877
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EDS-R00-3878
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EDS 2005/VE-43
EDS-R00-3879
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Correction to Steam Rate for PercentNoncondensibles
EDS-R00-3880
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Steam Jet Ejector Consumption Chart
EDS-R00-3881
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System
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Condensate Removal Utilizing a Pump
EDS-R00-3882
C d t R l U i H t W ll
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Condensate Removal Using Hot Well
and Elevated Condensers
EDS-R00-3883
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Design Parameters
EDS-R00-3884
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(Duty) BTU/Hr
(8.33 #/Gal) (1 BTU /# F) (60 Min /Hr) (C.W. Rise, F) (.8)
(.8) Assumes utilization of 80% of total available rise
= GPM C.W.
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Problems
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EDS 2005/VE-53
Ejector Application Information
EDS-R00-3870
1 micron 10 microns 100 microns 1 mm 10 mm 100 mm 1000 mm
Suction Pressure (Microns and mm Hg ABS)
3 Stage
1 mm to 25 mm
4 Stage
150 microns to 4 mm
5 Stage
20 to 300 microns
6 stage
2 to 100 microns
1 atmos.
2 Stage
10 mm to 100 mm
1 stage
75 mm to atmos.
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EDS 2005/VE-54EDS-R00-3878
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EDS 2005/VE-55EDS-R00-3879
St J t Ej t C ti Ch t
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Steam Jet Ejector Consumption Chart
EDS-R00-3881