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Pump NPSH(a), Suction and Delivery Lines Head Loss Calculation for Sugar Process Industry Pumps
S.NO
Description
Values
UOM
1
Pump Capacity
M
3
/hr
2
Pump Suction line dia
mm
3
Number of
valves in Suction line (b/f)
no.s
4
Suction length including bends
mtrs
5
Number of 90
o
bends in Suction
no.s
6
No. of "T" bends in Suction
no.s
7
Delivery line size
mm
8
Author:
including horizontal and vertical length
Total delivery line length (including horizontal and vertical length)
mtrs
9
Elevation from pump shaft to delivery end point
(Vertical height only)
mtrs
10
Nunber of Right angle valves in delivery line
no.s
11
Number of
B/F valves in delivery line
no.s
12
Number of double beet valves in delivery line
no.s
13
Number of 90
o
bends in delivery line
no.s
14
Number of 45
o
bends in delivery line
no.s
15
Number of "T" bends in delivery line
no.s
16
Liquid Temperature in
o
C
o
C
17
Liquid Brix in % (Solids percent)
%
18
Author:
if negative head than enter negative value
Average maintained Liquid level in suction tank from the pump shaft (if negative head than enter negative value)
Author:
if negative head than enter negative value
mtrs
19
Author:
atmospheric pressure;
taking that as 770 mm of mercury:
Suction Tank condition
Author:
Receiving mound having vent or open or having equalizing line than atmospheric pressure taking as 770 mm of mercury:
mm of Hg
Results
20
Flow Quantity
M
3
/sec
21
Liquid Density
kg/m
3
22
Author:
peter rein 745
The Dynamic viscosity of liquid
Centi poise
23
The Dynamic viscosity of liquid
Kg/(m.hr)
24
The kinematic viscosity of liquid (η) in
m
2
/sec
25
Water Vapour pressure at given liquid temperature
MWC
26
Resistance coefficient for 90
o
bend in suction line
27
Resistance coefficient for "T" in suction line
28
Resistance coefficient for b/f valve in suction line
29
Resistance coefficient for 90
o
bend in delivery line
30
Resistance coefficient for 45
o
bend in delivery line
31
Resistance coefficient for "T" in delivery line
32
Resistance coefficient for b/f valve in delivery line
33
Resistance coefficient for right angle valve in delivery line
34
Resistance coefficient for Double beet valve in delivery
NPSH(a) CALCULATION
A
Pressure at the tank
mwc
B
Vapour tension
mwc
C
Suction Head
mwc
D
Loss of Head in Suction line
Velocity of meterial in suction line
(U ) in m/sec
m/sec
Reynolds number R= UD/η
Author:
Hugot- 1120
Resistance coefficient for suction pipe (λ )
λ = 0.0032+(0.221/R
0.237
)
λ = 0.01(A/D)
0.314
if take A= 2.5
λ = 0.01(A/D)
0.314
if take A= 5
Author:
Here λ = 0.0032+(0.221/R0.237) consider R value having below 100000 and λ = 0.01(2.5 /D)0.314 consider R value having 100000 to 1000000 and λ = 0.01(2.5 /D)0.314 consider R value having above 1000000
λ value according to Reynolds number
a
Author:
λ x U2 / (Dia x 2g)
Head loss due to Pipe length
mwc
b
Head loss due to 90
o
bend in suction
mwc
c
Head loss due to "T" in suction
mwc
d
Head loss due to b/f valve in suction
mwc
Loss of Head in Suction line (a+b+c+d)
mwc
NPSH available (A -B+C-D)
mwc
Loss of Head in Delivery line
Velocity of meterial in delivery line
(U )
m/sec
Reynolds number R= UD/η
Resistance coefficient for delivery pipe
(λ )
λ = 0.0032+(0.221/R
0.237
)
λ = 0.01(A/D)
0.314
if take A= 2.5 for new cost iron or steel,
λ = 0.01(A/D)
0.314
if take A= 5 for old rusted lines
Author:
Here λ = 0.0032+(0.221/R0.237) consider R value having below 100000 and λ = 0.01(2.5 /D)0.314 consider R value having 100000 to 1000000 and λ = 0.01(2.5 /D)0.314 consider R value having above 1000000
λ value accoding to Reynolds number
e
Head loss due to delivery Pipe line length
mwc
f
Author:
K x U2 / 2g
Head loss due to 90
o
bend in delivery line
mwc
g
Head loss due to 45
o
bend in delivery line
mwc
h
Head loss due to right angle valve in delivery line
mwc
i
Head loss Double beet valve in delivery line
mwc
j
Head loss due to "T" in delivery line
mwc
k
Head loss due to b/f valve in delivery line
mwc
E
Loss of head due pipe length and fittings in delivery line (e+f+g+h+i+j+k)
mwc
Total head loss in delivery line (10 + E)
mwc
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