Assignment 1
[ Step 1 ] Obtaining optimum Diameter of the steel pipe
Water flowing at 61°F
Flow rate,
Assume, turbulent flow.
∴ turbulent flow.
[ Step 2 ] Determine the maximum flow rate
[ Step 3 ] Determine the total friction loss, in the pipe & fittings
Pump outlet : point 1, overhead tank inlet : point 2 로 놓고 Bernoulli Eq.
linear velocity,
( assuming )
Average velocity =
Equivalent roughness, = 0.00015 ft ( from textbook p 482 )
∴ Friction factor = f = 0.0045 ( from Fig. 14-1 )
Total Le for fittings & valves
Le =
Friction due to flow through pipe & all fittings
∴
[ Step 4 ] EQ % valve sizing
From Valve Performance Eq.
∴
[ Step 5 ] Pump selection
Total Head at normal flow rate, from the pump performance chart,
Check :
So the recommended pump : 68.5% efficiency, 28HP , 8 pump
[ Step 6 ] Resizing of Pipe
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2011.03.10
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