18
General
CLB/EN (1901) 6.6
Criterion A is the pass-or-fail minimum efficiency requirement at the best efficiency point
(BEP) of the pump:
Where
Criterion B is the pass-or-fail minimum efficiency requirement at part load (PL) and at
overload (OL) of the pump:
Therefore a method is devised what is called a “house of efficiency” scheme that also
requires pumps to pass efficiency thresholds at 75% and 110% of rated flow. The
advantage of this is that pumps will be penalised for poor efficiency away from rated
efficiency, hence it will take account of real life pump duties.
It should be stated that while the scheme may appear complicated at first sight, in
practice it has been easy for the manufacturers to apply the scheme to their pumps.
Figure 1:
House of Efficiency
η
Pump
n
s
Q
BEP
,
η
BOTTOM
≥
n
s
n
N
Q
BEP
H
BEP
0.75
-------------------
×
=
η
BOTTOM
PL OL
,
–
x
η
BOTTOM
⋅
≥
Head
η
BEP
H
BEP
Q
BEP
Flow
0
Q
PL
Q
OL
η
PL
= 0.94
η
BEP
η
BEP
η
OL
= 0.98
η
BEP
Pump Eff.
Curve
System
Curve
Summary of Contents for SPX Flow CombiLineBloc
Page 2: ......
Page 6: ...4 INT EN 1512 1 2 ...
Page 10: ...8 CLB EN 1901 6 6 ...
Page 14: ...12 Introduction CLB EN 1901 6 6 ...
Page 26: ...24 General CLB EN 1901 6 6 ...
Page 44: ...42 Disassembly and assembly CLB EN 1901 6 6 ...
Page 50: ...48 Dimensions CLB EN 1901 6 6 ...
Page 56: ...54 Parts CLB EN 1901 6 6 ...
Page 66: ...64 ORDFORM 1512 3 3 EN ...