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Flow Characteristics
• Viscosity determined through index matching, (550 SSU, 109 cP, 0.109 Pa-s)– Much higher than water (1 cP)
• Flow tested by Army is from 2-10 L/min– Using Reynolds number matching, 6-32 GPM
• Pressure loss through system ranges from 20 psi to 50 psi– Calculated using Poiseuille flow
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Positive Displacement vs. Centrifugal
Conclusion: PD pumps provided better flow control, regardless of pressure and handle high viscosities.
Graph Credit: pumpschool.com
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PD Pump SelectionPump Flow Rates Pressures Comments Cost (3 highest)
Gear pump Acceptable,Up to 30 gpm
Acceptable,Up to 50 psi
Common, can be self-priming
2
Rotary Vane Acceptable Acceptable Not really used in our application, better for thin fluids and high pressure differentials
2
Diaphragm Acceptable Acceptable Create pulsing flow, need air supply, cheaper
1
Lobe Pump Acceptable Acceptable Used in Sanitary applications where fragile solids are used, bi-rotational, may be overly complex
3
Image Credit: Wikipedia; Info Credit: pumpscout.com
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3 GPM 35 GPM
6 GPM 33 GPM19 GPM
Siewert, 1.6-16 GPM, $2,079
Siewert, 3.2-32 GPM, $2,319
Siewert, 2.3-23 GPM, $2,189
Emerick, 3.3-33 GPM, $2,754
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• Max flow rate: 33 GPM• Min flow rate: 3.3 GPM• Max Pressure: 200 psi• Speed Ratio: N/A• Price: $2,745• Shipping not included• Lead time: 3-4 weeks
• Max flow rate: 32 GPM• Min flow rate: 3.2 GPM• Max Pressure: 100 psi• Speed Ratio: 10:1• Price: $2,319• Shipping included• Installation Assistance• Lead time: 5-6 weeks
Emerick Siewert
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Inhalation Pipe Schematic