2. A fire truck is sucking water from a river and delivering it through a long hose to a nozzle. The total length of the galvanized iron hose corrected for valves, fittings, entrance, etc. - is 90 [m]. The energy provided by the fire truck for pumping the water is 53 [kJ/kg]. What diameter is needed for the hose to provide an average velocity of 30 [m/s]? -

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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2.
A fire truck is sucking water from a river and delivering it through a long
hose to a nozzle. The total length of the galvanized iron hose corrected for valves,
fittings, entrance, etc. - is 90 [m]. The energy provided by the fire truck for pumping
the water is 53 [kJ/kg].
What diameter is needed for the hose to provide an average velocity of 30 [m/s]?
river
I
I
30 [m]
pump
16
Transcribed Image Text:2. A fire truck is sucking water from a river and delivering it through a long hose to a nozzle. The total length of the galvanized iron hose corrected for valves, fittings, entrance, etc. - is 90 [m]. The energy provided by the fire truck for pumping the water is 53 [kJ/kg]. What diameter is needed for the hose to provide an average velocity of 30 [m/s]? river I I 30 [m] pump 16
Table 2.1. Roughness of Clean Pipe²
€, mm
Pipe material
Riveted steel
Concrete
Wood stave
Cast iron
Galvanized iron
Asphalted cast iron
Commercial steel or wrought iron
Drawn tubing
Glass
Plastic (PVC, ABS, polyethylene)
1-10
0.3-3
0.2-1
0.26 (0.25) ¹
0.15 (0.15)
0.12 (0.13) b
0.046 (0.043)
0.0015
0
0
"Adapted from Fischer and Porter Co., Hatboro, PA,
Catalogs section 98-A (1947).
Values in parentheses from Colebrook (1939).
Transcribed Image Text:Table 2.1. Roughness of Clean Pipe² €, mm Pipe material Riveted steel Concrete Wood stave Cast iron Galvanized iron Asphalted cast iron Commercial steel or wrought iron Drawn tubing Glass Plastic (PVC, ABS, polyethylene) 1-10 0.3-3 0.2-1 0.26 (0.25) ¹ 0.15 (0.15) 0.12 (0.13) b 0.046 (0.043) 0.0015 0 0 "Adapted from Fischer and Porter Co., Hatboro, PA, Catalogs section 98-A (1947). Values in parentheses from Colebrook (1939).
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