GB/T 18149-2017Centrifugal,mixed flow and axial pumps—Code for hydraulic performance tests—Precision class (English PDF)

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 18149-2000 "centrifugal pump, mixed flow pump and axial flow pump hydraulic performance test specification precision level", and GB/T 18149-2000 compared to the editorial changes in the main technical differences are as follows.

--- revised the preamble (see the preface, 2000 edition of the preface);

--- removed the ISO preface (see 2000 ISO preface);

--- modified the introduction (see Introduction, 2000 edition O introduction);

- modified scope (see Chapter 1, Chapter 1 of the 2000 edition);

- Removed areas of application (see Chapter 2 of the 2000 edition);

- modified normative reference documents (see Chapter 2, Chapter 3 of the 2000 edition);

- modified definitions and symbols (see Chapter 3, Chapter 4 of the 2000 edition);

- Added definition of NPSH3, effective NPSH and required NPSH (see Table 1);

- the definition of the critical ablation margin is removed (see Table 1 of the 2000 edition);

- delete the definition (see 6.3.2.1 of the 2000 edition);

- Removed the activity measuring plate in the flow measurement method, the calibrated weir, the velocity area method and the tracer method (see the 2000 edition 8,7.4,7.6,7.8,7.9);

- Adjust the pressure measurement by placing the static pressure gauge and pressure scale contents in Appendix F (see Appendix F, 2000, 8.4.2.2 and 8.4.2.3);

- The measurement of the input power is modified and the indirect method of measuring the input power is placed in Appendix G (see Appendix G, 2000 10.2);

- modified measurement of the power connection diagram (see Figure G.1 and Figure G.2, 2000, 19 and 20);

- Revised the 11.0 Introduction, which will be modified into scope (see Chapter 11 of Chapter B.1, 2000);

--- modified the thermodynamic method to measure the efficiency of the pump, the thermodynamic method to measure the efficiency of the pump and the thermodynamic properties of water and thermodynamics (See Appendix B, Chapter 11 of the 2000 edition and Appendix C);

(2 k/2)% H, revised to 3% H (see Chapter 10, Chapter 12 of the 2000 edition);

--- Remove the open pool with the inlet flow control valve to change the method of cavitation [see Figure 25c of the 2000 edition) and Figure 27];

- to modify the estimation and analysis of the uncertainty, to change the estimate of uncertainty to the uncertainty (see Appendix C, 2000 Version of Appendix A);

- Table A2 in Appendix A was deleted (see Appendix A of the 2000 edition);

- modified according to different cavitation judging criteria, at different NPSH values can be measured under the impact of cavitation (see Figure D.1, 2000 Figure D.1);

Amend the reference (see reference F, 2000 ed.).

Introduction

This standard is a test specification for the highest accuracy of the hydraulic performance test standard for centrifugal pumps, mixed flow pumps and axial pumps.

On the rotary power pump hydraulic performance test specification, in addition to this standard, there are GB/T 3216, which is mainly used for acceptance test, almost Including all the industrial needs.

Both the buyer and the manufacturer need to carefully check whether the accuracy required by the precision test is possible at the site, at the manufacturer's test stand Or in a mutually agreed laboratory, only in the case of appropriate, can be carried out precision-level hydraulic performance test. Before the test Can not give precision precision guarantee.

This standard does not recommend manufacturing tolerances or total tolerances for inspection purposes. The contractual interpretation of the test results is a matter of agreement between the parties (see Appendix A).

To carry out the precision test, in the drafting of the contract need to pay attention to the installation conditions on the pump hydraulic performance.

1 Scope

This standard specifies the centrifugal pump, mixed flow pump and axial flow pump (hereinafter referred to as "pump") hydraulic performance precision test requirements.

This standard is applicable to the research, development and acceptance of high-tech pumps with special requirements and the need for precision testing of hydraulic performance.

This standard is applicable to real pumps and model pumps tested at test benches or on site.

This standard applies to pumps that do not have piping accessories, as well as to pumps that connect all or part of upstream and/or downstream piping accessories Fit. This standard does not apply to energy storage pumps.

2 Normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including all modifications) applies to this document.

GB/T 2624 (all parts) Measure the full flow of fluid with a differential pressure device installed in a circular cross-section pipe

GB/T 3216 rotary power pump hydraulic performance acceptance test 1 and 2

GB/T 3358 (all parts) Statistical vocabulary and symbols

Measurement of liquid flow in closed conduits

Test procedures for on-site acceptance of hydraulic performance of turbines, accumulator pumps and water pump turbines GB/T 20043

GB/T 26801 Measurement of fluid flow in closed pipes Connection method for pressure signal transmission between primary and secondary devices

ISO 3966 Fluid Flow Measurement in Closed Pipes The speed area of the Pieto hydrostatic tube (Measurementoffluidflow inclosedconduits-VelocityareamethodusingPitotstatictubes)

ISO 4373 Hydrometry-Waterlevelmeasuring Devices

ISO 7194 Fluid Flow Measurement in Closed Piping Flow Velocity Meter or Pieto Static Pressure Pipe for Measuring Eddy Current or Asymmetric Flow in Circular Pipes The velocity of the flow rate method (Measurementoffluidflowinclosedconduits-Velocity-areamethodsof flowmeasurementinswirlingorasymmetricflowconditionsincircularductsbymeansofcurrent-me-tersorPitotstatictubes)

ISO 8316 Liquid flow measurement in closed piping Measuring method for measuring liquid by measuring cylinder (Measurementofliquidflowin closedconduits-methodbycolectionoftheliquidinavolumetrictank)

3 Terms, definitions, symbols and codes