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GB 32284-2015: Minimum allowable values of energy efficiency and energy efficiency grades for petrochemical centrifugal pumps
GB 32284-2015
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.010
F 01
Minimum allowable values of energy efficiency and
energy efficiency grades for petrochemical centrifugal
pumps
ISSUED ON: DECEMBER 10, 2015
IMPLEMENTED ON: JANUARY 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Technical requirements ... 5 
Appendix A (Informative) Calculation method of energy efficiency grades for
pumps ... 12 
Appendix B (Informative) Calculation method of target minimum allowable
values of energy efficiency for pumps ... 14 
Minimum allowable values of energy efficiency and
energy efficiency grades for petrochemical centrifugal
pumps
1 Scope
This Standard specifies the basic requirements for petrochemical centrifugal
pumps (hereinafter referred to as “pumps”), efficiency calculation methods for
pumps, energy efficiency grades for pumps, minimum allowable values of
energy efficiency for pumps, target minimum allowable values of energy
efficiency for pumps, and evaluating values of energy conservation for pumps.
This Standard applies to single-stage single-suction pumps and single-stage
double-suction pumps with closed (maximum) impellers installed which deliver
clean liquids.
This Standard does not apply to clean-water centrifugal pumps, non-metallic
centrifugal pumps, and seal-less rotodynamic pumps.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 3215 Centrifugal pumps for petroleum petrochemical and natural gas
industries
GB/T 3216 Rotodynamic pumps - Hydraulic performance acceptance tests -
Grades 1, 2 and 3
GB/T 5656 Technical specification for centrifugal pumps - Class II
GB/T 7021 Glossary of terms for centrifugal pump
GB/T 13006 NPSH for centrifugal, mixed flow and axial flow pump
3 Terms and definitions
The terms and definitions as defined in GB/T 7021 and the following ones apply
to this document.
3.1 Specified point
The point on the pump performance curve determined by the specified flow and
the specified head.
3.2 Minimum allowable values of energy efficiency for pumps
The minimum efficiency of the specified point allowed under the test conditions
specified by the standard.
3.3 Target minimum allowable values of energy efficiency for pumps
The minimum efficiency of the specified point allowed after the implementation
of this Standard for a certain period of time.
3.4 Evaluating values of energy conservation for pumps
The minimum efficiency of the specified point which shall be achieved to meet
the energy conservation certification requirements under the test conditions
specified by the standard.
4 Technical requirements
4.1 Basic requirements
4.1.1 The design and manufacture of the pumps should meet the requirements
of GB/T 3215 or GB/T 5656.
4.1.2 Unless otherwise agreed with the user, the required NPSH (NPSHR) of
the pump’s specified point shall comply with the provisions of GB/T 13006.
4.1.3 The test methods of the pumps shall comply with the provisions of GB/T
3216. The allowable tolerance coefficient of the flow (Q), head (H), efficiency
(η), and NPSHR of the pump shall comply with Grade 2 regulations of GB/T
3216.
4.2 Calculation methods of pump efficiency and specific speed
4.2.1 Calculation of pump efficiency
Pump efficiency is a percentage of the ratio of pump output power (effective
n - Speed, in revolutions per minute (r/min).
4.3 Energy efficiency grades for pumps
The energy efficiency grades for pumps are divided into 3 grades, of which 1 is
the highest and 3 is the lowest. The energy efficiency grades for pumps are
determined according to Table 1. When the flow is greater than 3000 m3/h, the
energy efficiency grade for pump is determined according to the flow Q=3000
m3/h. For an example of calculation method of energy efficiency grades for
pumps, see Appendix A.
4.4 Minimum allowable values of energy efficiency for pumps
The minimum allowable values of energy efficiency for pumps shall not be lower
than the energy efficiency grade 3 η3 of Table 1.
4.5 Target minimum allowable values of energy efficiency for pumps
When the flow is in the range of 5 m3/h~3000 m3/h, the target minimum
allowable value ηT0 of energy efficiency for pumps is determined as follows:
a) When 120≤ns≤210, any target minimum allowable value (ηT0) of energy
efficiency in the specific speed range shall be found in Figure 1 (or Table
2);
b) When 20≤ns< 120 and 210< ns≤300, for any target minimum allowable
value (ηT) of energy efficiency in the specific speed range, ηT0 shall be
found in Figure 1 (or Table 2); then according to Figure 2 (or Table 3) and
Figure 3 (or Table 3) respectively, FIND Δη. Then according to formula (4),
calculate ηT.
Where:
ηT - Target minimum allowable value of energy efficiency for pump when
20≤ns< 120 and 210< ns≤300;
ηT0 - Target minimum allowable value of energy efficiency for pump when
120≤ns≤210;
Δη - Pump efficiency correction value when 20≤ns< 120 and 210< ns≤300.
For an example of calculation method of target minimum allowable values of
energy efficiency for pumps, see Appendix B.
Appendix A
(Informative)
Calculation method of energy efficiency grades for pumps
A.1 Example
The performance of the specified point of a single-stage double-suction
petrochemical centrifugal pump is: Q=800 m3/h, H=12 m, n=1470 r/min.
Calculate the efficiency value η1 of energy efficiency grade 1, the efficiency
value η2 of energy efficiency grade 2, and the efficiency value η3 of energy
efficiency grade 3.
A.2 Calculate the specific speed ns of pump
Substitute the above example data into formula (3) to calculate:
A.3 Calculate the efficiency values of energy efficiency grades for pumps
A.3.1 Calculate the efficiency value η1 of energy efficiency grade 1 for
pump
The efficiency value η1 of energy efficiency grade 1 for pump may be calculated
as follows:
a) FIND the reference value η;
According to Figure 1 (or Table 2), when Q=800 m3/h, η=81.9%.
b) Determine the efficiency correction value Δη;
According to Figure 3 (or Table 3), when ns=277.4, Δη=2.1%.
c) Calculate the efficiency value η0 of specified point of pump;
d) Calculate the efficiency value η1 of grade 1 for pump;
According to Table 1, when Q=800 m3/h, the efficiency value of energy
efficiency grade 1 is: