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Fall 2004
1
ME 416
Computer Assisted Design of
Thermal Systems
Example Piping/Pump Calculation
Consider the piping system shown below:
The piping is galvanized steel and starting with the reservoir, the details are provided below
Component ID(inches) length Pipe 3/4 5" Pump -- -- Pipe 1" 1' Gate Valve (fully open) 1" -- Pipe 1" 1'
90 ° Elbow (threaded) 1"^ -- Pipe 1" 3' 90 ° Elbow (threaded) 1"^ -- Pipe 1" 6" Expansion 1"-2" -- Pipe 2" 1' Contraction 2"-1" -- Pipe 1" 1' 90 ° Elbow (threaded) 1"^ -- Pipe 1" 2' Flow Rate: 25 gpm
Reservoir
Dev
Pump
m
Valve
m
3/4 " ID 1 " ID 2 " ID
ME 416 CAD of Thermal Systems Fall 2004
2
Converting to SI units we have a water flow rate of 1.58 x 10-3^ m^3 /s flowing through a galvanized steel system with roughness 0.14 mm.
- Pipe: 0.3048 m of diameter 0.0254 m
- 90 degree threaded elbow
- Pipe: 0.3048 m of diameter 0.0254 m
- 90 degree threaded elbow
- Pipe: 0.914 m of diameter 0.0254 m
- Open threaded gate valve
- Pipe: 0.1524 m of diameter 0.0254 m
- Sudden Expansion from diameter of 0.0254 m to 0.0508 m
- Pipe: 0.3048 m of diameter 0.0508 m
- Sudden Expansion from diameter of 0.0508 m to 0.0254 m
- Pipe: 0.3048 m of diameter 0.0254 m
- 90 degree threaded elbow
- Pipe: 0.6096 m of diameter 0.0254 m
From Pump_Pipe.xls we find for an axial flow pump
Speed (rps) Diameter (m) Efficiency 30 0.1010 0. 45 0.0694 0. 60 0.0567 0. 90 0.0459 0.
