Curve charts/
Technical
S pumps, range 58
30
Curve conditions
The guidelines below apply to the curves shown in the
performance charts on page 32 to page 40.
• ANSI-HI centrifugal pump test 1.6-2000, Accep-
tance level B.
• The curves show pump performance with different
impeller diameters at rated speed.
• The
bold
part of the curves show the
recom-
mended
operating range.
• The curves apply to the pumping of airless water at
a temperature of 68 °F (+20 °C) and a kinematic vis-
cosity of 1 cSt (1 mm
2
/s).
•
NPSH:
The curves show average values measured
under the same conditions as the performance
curves.
When dimensioning the pump, add a safety margin
of at least 1.6 ft (0.5 m).
• In case of other densities than 133.5 ounces/gallon
(1000 kg/m
3
), the discharge pressure is proportional
to the density.
• When pumping liquids with a density higher than
133.5 ounces/gallon (1000 kg/m
3
), motors with cor-
respondingly higher outputs must be used.
Calculation of total head
The total pump head consists of the height difference
between the measuring the differential head +
the dynamic head.
Performance tests
The requested duty point for every pump is tested
according to ISO 9906, Annex A, and without certifica-
tion.
In case of pumps ordered on the basis of impeller diam-
eter only (no requested duty point), the pump will be
tested close to the best efficiency point (BEP) of the
published performance curve which is related to the
ordered impeller diameter (according to ISO 9906,
Annex A).
If the customer requires either more points on the curve
to be checked or certain minimum performances or cer-
tificates, individual measurements must be made, and
a certificate can be ordered.
Certificates
Certificates have to be confirmed for every order and
are available on request as follows:
• Certificate of compliance with the order
(EN 10204 - 2.1)
• Pump test sheet.
Witness test
When the pumps are being tested or are tested with a
certification it is possible for the customer to witness the
testing procedure according to ISO 9906.
The witness test is not a certificate and will not result in
a written statement from Grundfos. The witness itself is
the only guarantee that everything is carried out as pre-
scribed in the testing procedure.
If the customer wants to witness test the pump perfor-
mance, place this request on the order.
H
geo
: Height difference between measuring points.
H
stat
: Differential head between suction and the dis-
charge side of the pump.
H
dyn
: Calculated values based on the velocity of the
pumped liquid on the suction and the discharge
side of the pump.
Htotal
Hgeo Hstat Hdyn
+
+
=
S_Range_58-60Hz.book Page 30 Thursday, July 8, 2010 2:30 PM
