GB 32284-2015Minimum allowable values of energy efficiency and energy efficiency grades for petrochemical centrifugal pumps (English PDF)

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.

4.1 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 (eta), 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 eta3 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 etaT0 of energy efficiency for pumps is determined as follows:

a) When 120<=ns<=210, any target minimum allowable value (etaT0) 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 (etaT) of energy efficiency in the specific speed range, etaT0 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 deltaeta. Then according to formula (4), calculate etaT.

Where:

etaT - Target minimum allowable value of energy efficiency for pump when

20<=ns< 120 and 210< ns<=300;

etaT0 - Target minimum allowable value of energy efficiency for pump when

120<=ns<=210;

deltaeta - 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 eta1 of energy efficiency grade 1, the efficiency value eta2 of energy efficiency grade 2, and the efficiency value eta3 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 eta1 of energy efficiency grade 1 for

pump

The efficiency value eta1 of energy efficiency grade 1 for pump may be calculated as follows:

a) FIND the reference value eta;

According to Figure 1 (or Table 2), when Q=800 m3/h, eta=81.9%.

b) Determine the efficiency correction value deltaeta;

According to Figure 3 (or Table 3), when ns=277.4, deltaeta=2.1%.

c) Calculate the efficiency value eta0 of specified point of pump;

d) Calculate the efficiency value eta1 of grade 1 for pump;

According to Table 1, when Q=800 m3/h, the efficiency value of energy efficiency grade 1 is:

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