DESIGN AND CONSTRUCTION OF AN INDUCTION FURNACE (COOLING SYSTEM)

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DESIGN AND CONSTRUCTION OF AN INDUCTION
FURNACE(COOLING SYSTEM)
Presented by MG THANT ZIN WIN Roll No Ph.D-M-7
Supervisors Dr Mi Sanda Mon
Daw Khin War Oo
20th Seminar
10.11.2004
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Net Positive Suction Head Available (NPSHA)

• It depends upon the elevation or pressure of the
  suction supply friction in the suction line,
  attitude of the installation, and the vapor
  pressure of the liquid being pumped.

hsp static pressure head (absolute) applied to
the fluid, m or ft hs elevation difference
from the level of fluid in the water tank to
the pump inlet, m or ft If pump
is below water tank, hs is positive.
If pump is above water tank, hs is negative. hf
fraction loss in suction piping, m or ft hvp
vapor pressure of the liquid at the pumping
temperature in meters or feet of the
liquid
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Net Positive Suction Head Required (NPSHR)

• It varies with flow, temperature and attitude
  have no effect.

N required motor speed, rpm Q the water flow
rate of pump, m3/min
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Checking for Suction Performance of Cooling
System of UNIDO Induction Furnace
Pump
GI Pipe
15.6972m
Water tank
PVC Pipe
3.6576m
Fig Suction line arrangement
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Pump
Ball valve
0.2032 m
Foot valve
Water cooling tank
Fig Side view of water cooling tank with
pumping station
Known data Capacity to be pumped 0.69 m3/min
Required motor speed 2900
rpm Size of all pipes, valves and
fittings
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Determine the Fraction Losses for GI Pipe
where,
From Moody diagram, f 0.0195
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where,
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Determine the Fraction Losses for PVC Pipe
where,
From Moody diagram, for smooth pipe f 0.0139
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(No Transcript)
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where,
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Absolute pressure Atmospheric pressure - gage
pressure Atmospheric pressure
water tank Pabs 101.25 kPa
0
where,
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Fig Vapor pressure of water
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It may be suitable to use or select a centrifugal
pump for cooling system of UNIDO Induction
Furnace.
Finally,
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