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5. 2. 2. 3 MINIMUM FLOW FOR CON TINUOUS OPERATION
Permitted flow range :
Q
is the constant flow corresponding to Best Efficiency Point.
opt
0,3.Q
<Q<1,1.Q
opt
opt
0,5.Q
<Q<1,1.Q
opt
opt
When the pump is used in an ATEX zone it is necessary to measure
the duty point and check that temperature increase corresponding
to each working condition is acceptable regarding selected surface
temperature.
The formula below gives the correspondence between surface
temperature / fluid temperature and pump efficiency :
T
=T
+
o
f
v
=[(g.H)/(c.)]*(1‐)
v
With :
c=calorific capacity of fluid in J/Kg.K
g=gravity in m/s²
H=pump head in m
T
=liquid temperature in °C
f
T
=surface temperature in °C
o
=hydraulic efficiency at duty point
=differential temperature
v
5. 2. 2. 4 MA XIMUM ALLOWABLE SPEED A ND NUMB ER OF
STARTS PER HOUR
Maximum speed :
The maximum speed for each pump size is indicated in the table below.
Maximum allowable speed depends on working temperature and
impeller diameter.
3600
RPM
32‐160 32‐200
40‐160 40‐200
50‐160 50‐200
65‐160 65‐200
80‐160 80‐200
100‐160 100‐200
Number of starts per hour :
Wait for pump full stop before starting‐up the pump again to
avoid damaging the motor and the pump.
Starting frequency depends on motor type. Ask manufacturer if
necessary.
A maximum of 8 starts per hour is recommended.
5.2.2.5 TYPE OF HANDLED FLUIDS
The pump is used to transfer overheated water from 120°C to 230°C.
5.2.3
DIRECTION OF ROTATION
Serious damage can result if the pump is started or run in the
wrong direction of rotation.
Ensure that the direction of rotation is correct before first start‐up or if
maintenance work has been carried out on the electric power supply.
Direction of rotation must correspond to the arrow attached or
engraved in the pump.
Check direction of rotation when motor is apart (coupling spacer
dismantled or motor not coupled to pump). If not feasible due to pump
design (pump fitted with rigid coupling) it is necessary to check that
pump shaft turns freely after the test and before final pump start.
PUMP SIZE
32‐160 to 80‐250
100‐315
100‐160 to 100‐250
125‐200 to 125‐250
3000
1800
RPM
RPM
32‐250
40‐315
40‐250
50‐315
50‐250
65‐315
65‐250
80‐315
80‐250
100‐315
100‐250
125‐250
125‐200
To check direction of rotation start motor briefly and check direction of
rotation just before rotation stops. If direction of rotation must be
modified then reverse two phases in motor junction box.
It is possible to change two phases in the control cabinet on motor
starter connections. If this solution is preferred then it will be
necessary to modify the identification of the cables in the electrical
drawings too.
5.2.4
NOISE LEVEL
Noise level of a complete pump set depends on motor type and speed,
on quality and wear of flexible coupling (if concerned), on fluid velocity,
piping design, ... Values given hereafter are only indicative and based on
fan cooled electric motors average noise levels.
The test must be perfomed on the supplied pump if the noise level
must be certified.
If noise level is higher than 85dBA, personel working in pump area
should wear hearing protections.
Motor speed
Elec motor power
[KW]
< 0,55
0,75
1,1
1,5
2,2
3
4
5,5
7,5
11
15
18,5
22
30
37
45
55
75
90
110
150
Indicative noise level given in dBA (LpA at 1 m)
5.2.5
CONNECTIONS
Suction flange axis is horizontal and the face is vertical.
Discharge flange axis is vertical and the face is horizontal.
5.2.6
PERMISSIBLE FORCES AND MOMENTS
No other stress than the one due to tightening of pipe and pump
flanges together should apply. No stress must be applied to pump
casing by the pipe work. A pre‐stress may exceptionally be applied to
flanges to compensate a pipe expansion. But in any case the resulting
forces should not exceed values given hereafter.
The values are determined on the basis of ISO/DIN 5199 – Class II
(1997)‐ Appendix B, family N°2 for a max working temperature of
110°C. Pump casing made of FGL cast Iron.
Following coefficients were applied to basic values :
Pump assembled on cast iron base:
Forces : 0,4 x F
base
Moments : 0,4 x F
base
Pump assembled on grouted cast iron base frame :
Forces : F x [1,5 – (12,5/Flange DN)]
Moments : M x (1 + Flange DN/250)
Coefficient due to flange rating :
C = 1,255 applied and forces and moments
Temperature correction for temperature > 110°C :
C = E
/ E
tm
20b
9
ENGLISH
2900 RPM
1450 RPM
Pump set
Bare shaft
Pump set
65
60
65
65
60
65
65
60
65
70
65
70
75
70
70
75
70
70
85
80
70
85
80
70
85
80
70
85
80
75
85
80
75
85
80
75
85
80
75
85
80
80
90
80
80
90
80
80
95
85
80
95
85
85
95
85
85
95
85
85
95
85
85
Bare shaft
60
60
60
65
65
65
65
65
65
70
70
70
70
75
75
75
75
80
80
80
80
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