Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 7784-2006 Test methods for power reciprocating pump.
In addition to editorial changes, the following main technical changes have been made with respect to GB/T 7784-2006 Test methods for power reciprocating pump:
——the test precision grading is added (see Clause 1);
——the "test type" and "test site" are further defined, and test elements such as "test personnel", "test schedule" and "test equipment" are added (see 4.1; Clause 4 of Edition 2006);
——the requirements for test device are added (see 4.3);
——the application scope of "test medium" is expanded (see 4.4.3);
——the application scope of rotating speed in performance test is expanded (see 4.4.4);
——the system errors of flow measurement using volumetric method and mass method are corrected (see 5.1; 6.1 of Edition 2006);
——the calculation equation of discharge pressure is corrected (see 6.2.1; 7.2.1 of Edition 2006);
——the calculation equation of suction pressure is corrected (see 6.2.2; 7.2.2 of Edition 2006);
——the calculation equation of net positive suction head is corrected (see 6.8; 7.8 of Edition 2006).
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee on Pumps of Standardization Administration of China (SAC/TC 211).
The previous editions of this standard are as follows:
——GB/T 7784-1981, GB/T 7784-1987 and GB/T 7784-2006.
Test methods for power reciprocating pump
1 Scope
This standard specifies the test implementation, parameter measurement, data processing, performance curve plotting and test report of power reciprocating pump (hereinafter referred to as "pump").
This standard includes two measurement precision grades: Grade 1 is applicable to high-precision test while Grade 2 is applicable to general-precision test. The two measurement precision grades include different tolerance coefficients, allowable fluctuations and measurement error limits.
This standard is applicable not only to pumps without any pipeline accessories, but also to pump assemblies with pipeline accessories.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1029 Test procedures for three-phase synchronous machines
GB/T 1032 Test procedures for three-phase induction motors
GB/T 1311 Test procedure for direct current machines
GB/T 3102.7 Quantities and units of acoustics
GB/T 3241 Octave-band and fractional-octave-band filters
GB/T 7785 Classification and vocabulary for reciprocating pump
GB/T 9069 Determination of sound power level for noise emitted by reciprocating pump - Engineering method
GB/T 9234 Power reciprocating pump
GB/T 13364 Measurement of mechanical vibration for reciprocating pump
JJG 176 Sound calibrator
JJG 188 Sound level meter
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 7785 as well as the followings apply.
3.1
rated differential pressure
difference between the rated discharge pressure and the rated suction pressure of the pump
4 Test implementation
4.1 Test types
4.1.1 Type tests shall be carried out for the identification of the first pump and the random inspection and approval of mass-produced pumps. The type test items are listed in Table 1, and the test precision shall not be lower than Grade 1.
4.1.2 For mass-produced pumps or finalized pumps, end-of-manufacturing test shall be carried out according to the items listed in Table 1.
Table 1 Test items
Test item Test type
Type test End-of-manufacturing test
Trial operation √ √
Load operation test √ —
Continuous operation test √ —
Performance test √ √
Adjusting performance test △ —
Cavitation performance test √ △
Safety pressure relief device test √ △
Noise test √ △
Vibration test √ △
Performance inspection at rated operating point — △
Note: "√" indicates that this test item shall be carried out; "△" indicates that this test item is to be negotiated by the manufacturer and the ordering party; "—” indicates that this test item may not be carried out.
4.2 Test organization
4.2.1 Test site
4.2.1.1 Factory test
The test shall be carried out in the manufacturing factory or at a place mutually agreed by the manufacturer/supplier and the buyer.
4.2.1.2 On-site test
4.2.1.2.1 If all requirements of this standard can be met, on-site test may also carried out, provided that a special agreement is available.
4.2.1.2.2 In case that the on-site conditions cannot fully comply with this standard, as long as the parties concerned have agreed on how to consider the uncertainty inevitably caused by the violation of the specified requirements, on-site test may also be carried out, and the data processing may be carried out by reference to Annex A.
4.2.2 Test personnel
4.2.2.1 The test shall be supervised by a person with sufficient experience and qualifications in measurement operation.
4.2.2.2 The operation and reading of complex measuring devices shall be undertaken by professionals with rich experience and qualifications in measurement operation.
4.2.3 Test schedule
4.2.3.1 The test schedule shall be the test basis prepared according to this standard for specific products. The test schedule shall at least include the test objectives, methods and basis.
4.2.3.2 Only the working data of rated points are the basic data for the test, and other data measured during the test are informative.
4.2.4 Test equipment
4.2.4.1 When determining the measuring method, the required measuring and recording instruments and equipment shall be specified simultaneously.
4.2.4.2 The test supervisor shall be responsible for inspecting the correctness and functional suitability of the instruments and equipment.
4.2.4.3 All measuring instruments and equipment shall be accompanied by reports proving that they meet the uncertainty requirements. Such reports shall be obtained through calibration or comparison with other national standards. If necessary, these reports shall be presented.
4.3 Test devices
4.3.1 A safety valve or other overpressure protection device shall be arranged on the discharge pipeline of the pump.
4.3.2 During the high-pressure pump test, necessary safety facilities shall be provided to ensure the personal safety of the test personnel.
4.3.3 The allowable pressure of the discharge pipeline shall be adapted to the maximum discharge pressure of the tested pump.
4.3.4 All joints of suction pipeline shall be free of leakage so as to prevent outside air from entering the pipeline.
4.3.5 In order to ensure that the variation range of the indicated values of pressure and flow measurement instruments meet the measurement requirements, a large enough air chamber or other pulsation suppressing device may be arranged on the pipeline.
4.3.6 During the cavitation performance test, when the suction pressure is lower than atmospheric pressure, a large enough vacuum vessel shall be arranged on the suction pipeline or the test shall be carried out at the specified suction height. If the test is carried out by simply adjusting the suction resistance, the length of the equal-diameter straight pipe section behind the inlet throttling device shall not be less than 12 times the diameter of the suction pipeline.
4.3.7 The pipeline system in the device shall not generate resonance or abnormal sound, and isolation or other methods shall be adopted to eliminate the effect of pipeline vibration or pulsation on data measurement.
4.3.8 The test pipeline system of the pump shall be adapted to the type and parameters of the pump. When the outlet pipeline adjusting device is fully opened, the discharge pressure of the pump shall not be higher than 25% of the rated value or 2MPa, whichever is smaller.
4.3.9 The device or test site shall be free of interference source affecting the data acquisition, or it has been certified that the interference of the interference source on data acquisition has been eliminated.
4.3.10 The device shall ensure the real-time performance and synchronization of data acquisition.
4.3.11 When an integrated data acquisition and processing system is adopted, it shall be able to certify that the consistency between the sensor and the data terminal meets the system uncertainty requirements.
4.3.12 The schematic diagram for test device is detailed in Annex B.
4.4 Test conditions
4.4.1 Basic requirements
4.4.1.1 The test shall be carried out on the test device meeting the requirements of 4.3 or on the site or in the procedure.
4.4.1.2 Except for the cavitation test, the net positive suction head available (NPSHa) of the device shall be ensured to be greater than the net positive suction head required (NPSHr) of the pump during the test.
4.4.1.3 Under the rated test condition, the discharge pressure of the pump shall not be lower than its rated pressure; the difference between the discharge pressure and suction pressure of the pump shall not be lower than its rated differential pressure.
4.4.1.4 During the test, the readings of all instruments shall be recorded simultaneously after confirming that the pump has reached stable conditions.
4.4.1.5 The test data and calculation results shall be recorded in the test record table and sorted out, and corresponding curve shall be plotted.
4.4.2 Operation stability
All measurements shall be carried out under stable conditions, and the allowable fluctuation ranges of the indicated values of measuring instruments for the measured parameters shall conform to the requirements of Table 2.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Test implementation 4.1 Test types 4.2 Test organization 4.3 Test devices 4.4 Test conditions 4.5 Measurement uncertainty 4.6 Test items 5 Measurement of parameters 5.1 Flow 5.2 Pressure and vacuum degree 5.3 Temperature 5.4 Pump speed 5.5 Power 6 Data processing 6.1 Flow 6.2 Pressure and vacuum degree 6.3 Pump speed 6.4 Power 6.5 Pump efficiency 6.6 Volume coefficient 6.7 Efficiency of pump unit 6.8 Net positive suction head 7 Plotting of performance curve 8 Test report Annex A (Informative) Test report form of power reciprocating pump Annex B (Informative) Schematic diagram of test devices for power reciprocating pump Annex C (Informative) Estimation and analysis on uncertainty Annex D (Informative) Noise determination
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 7784-2006 Test methods for power reciprocating pump.
In addition to editorial changes, the following main technical changes have been made with respect to GB/T 7784-2006 Test methods for power reciprocating pump:
——the test precision grading is added (see Clause 1);
——the "test type" and "test site" are further defined, and test elements such as "test personnel", "test schedule" and "test equipment" are added (see 4.1; Clause 4 of Edition 2006);
——the requirements for test device are added (see 4.3);
——the application scope of "test medium" is expanded (see 4.4.3);
——the application scope of rotating speed in performance test is expanded (see 4.4.4);
——the system errors of flow measurement using volumetric method and mass method are corrected (see 5.1; 6.1 of Edition 2006);
——the calculation equation of discharge pressure is corrected (see 6.2.1; 7.2.1 of Edition 2006);
——the calculation equation of suction pressure is corrected (see 6.2.2; 7.2.2 of Edition 2006);
——the calculation equation of net positive suction head is corrected (see 6.8; 7.8 of Edition 2006).
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee on Pumps of Standardization Administration of China (SAC/TC 211).
The previous editions of this standard are as follows:
——GB/T 7784-1981, GB/T 7784-1987 and GB/T 7784-2006.
Test methods for power reciprocating pump
1 Scope
This standard specifies the test implementation, parameter measurement, data processing, performance curve plotting and test report of power reciprocating pump (hereinafter referred to as "pump").
This standard includes two measurement precision grades: Grade 1 is applicable to high-precision test while Grade 2 is applicable to general-precision test. The two measurement precision grades include different tolerance coefficients, allowable fluctuations and measurement error limits.
This standard is applicable not only to pumps without any pipeline accessories, but also to pump assemblies with pipeline accessories.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1029 Test procedures for three-phase synchronous machines
GB/T 1032 Test procedures for three-phase induction motors
GB/T 1311 Test procedure for direct current machines
GB/T 3102.7 Quantities and units of acoustics
GB/T 3241 Octave-band and fractional-octave-band filters
GB/T 3785.1 Electroacoustics - Sound level meters - Part 1: Specifications
GB/T 3785.2 Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests
GB/T 3947 Acoustical terminology
GB/T 7785 Classification and vocabulary for reciprocating pump
GB/T 9069 Determination of sound power level for noise emitted by reciprocating pump - Engineering method
GB/T 9234 Power reciprocating pump
GB/T 13364 Measurement of mechanical vibration for reciprocating pump
JJG 176 Sound calibrator
JJG 188 Sound level meter
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 7785 as well as the followings apply.
3.1
rated differential pressure
difference between the rated discharge pressure and the rated suction pressure of the pump
4 Test implementation
4.1 Test types
4.1.1 Type tests shall be carried out for the identification of the first pump and the random inspection and approval of mass-produced pumps. The type test items are listed in Table 1, and the test precision shall not be lower than Grade 1.
4.1.2 For mass-produced pumps or finalized pumps, end-of-manufacturing test shall be carried out according to the items listed in Table 1.
Table 1 Test items
Test item Test type
Type test End-of-manufacturing test
Trial operation √ √
Load operation test √ —
Continuous operation test √ —
Performance test √ √
Adjusting performance test △ —
Cavitation performance test √ △
Safety pressure relief device test √ △
Noise test √ △
Vibration test √ △
Performance inspection at rated operating point — △
Note: "√" indicates that this test item shall be carried out; "△" indicates that this test item is to be negotiated by the manufacturer and the ordering party; "—” indicates that this test item may not be carried out.
4.2 Test organization
4.2.1 Test site
4.2.1.1 Factory test
The test shall be carried out in the manufacturing factory or at a place mutually agreed by the manufacturer/supplier and the buyer.
4.2.1.2 On-site test
4.2.1.2.1 If all requirements of this standard can be met, on-site test may also carried out, provided that a special agreement is available.
4.2.1.2.2 In case that the on-site conditions cannot fully comply with this standard, as long as the parties concerned have agreed on how to consider the uncertainty inevitably caused by the violation of the specified requirements, on-site test may also be carried out, and the data processing may be carried out by reference to Annex A.
4.2.2 Test personnel
4.2.2.1 The test shall be supervised by a person with sufficient experience and qualifications in measurement operation.
4.2.2.2 The operation and reading of complex measuring devices shall be undertaken by professionals with rich experience and qualifications in measurement operation.
4.2.3 Test schedule
4.2.3.1 The test schedule shall be the test basis prepared according to this standard for specific products. The test schedule shall at least include the test objectives, methods and basis.
4.2.3.2 Only the working data of rated points are the basic data for the test, and other data measured during the test are informative.
4.2.4 Test equipment
4.2.4.1 When determining the measuring method, the required measuring and recording instruments and equipment shall be specified simultaneously.
4.2.4.2 The test supervisor shall be responsible for inspecting the correctness and functional suitability of the instruments and equipment.
4.2.4.3 All measuring instruments and equipment shall be accompanied by reports proving that they meet the uncertainty requirements. Such reports shall be obtained through calibration or comparison with other national standards. If necessary, these reports shall be presented.
4.3 Test devices
4.3.1 A safety valve or other overpressure protection device shall be arranged on the discharge pipeline of the pump.
4.3.2 During the high-pressure pump test, necessary safety facilities shall be provided to ensure the personal safety of the test personnel.
4.3.3 The allowable pressure of the discharge pipeline shall be adapted to the maximum discharge pressure of the tested pump.
4.3.4 All joints of suction pipeline shall be free of leakage so as to prevent outside air from entering the pipeline.
4.3.5 In order to ensure that the variation range of the indicated values of pressure and flow measurement instruments meet the measurement requirements, a large enough air chamber or other pulsation suppressing device may be arranged on the pipeline.
4.3.6 During the cavitation performance test, when the suction pressure is lower than atmospheric pressure, a large enough vacuum vessel shall be arranged on the suction pipeline or the test shall be carried out at the specified suction height. If the test is carried out by simply adjusting the suction resistance, the length of the equal-diameter straight pipe section behind the inlet throttling device shall not be less than 12 times the diameter of the suction pipeline.
4.3.7 The pipeline system in the device shall not generate resonance or abnormal sound, and isolation or other methods shall be adopted to eliminate the effect of pipeline vibration or pulsation on data measurement.
4.3.8 The test pipeline system of the pump shall be adapted to the type and parameters of the pump. When the outlet pipeline adjusting device is fully opened, the discharge pressure of the pump shall not be higher than 25% of the rated value or 2MPa, whichever is smaller.
4.3.9 The device or test site shall be free of interference source affecting the data acquisition, or it has been certified that the interference of the interference source on data acquisition has been eliminated.
4.3.10 The device shall ensure the real-time performance and synchronization of data acquisition.
4.3.11 When an integrated data acquisition and processing system is adopted, it shall be able to certify that the consistency between the sensor and the data terminal meets the system uncertainty requirements.
4.3.12 The schematic diagram for test device is detailed in Annex B.
4.4 Test conditions
4.4.1 Basic requirements
4.4.1.1 The test shall be carried out on the test device meeting the requirements of 4.3 or on the site or in the procedure.
4.4.1.2 Except for the cavitation test, the net positive suction head available (NPSHa) of the device shall be ensured to be greater than the net positive suction head required (NPSHr) of the pump during the test.
4.4.1.3 Under the rated test condition, the discharge pressure of the pump shall not be lower than its rated pressure; the difference between the discharge pressure and suction pressure of the pump shall not be lower than its rated differential pressure.
4.4.1.4 During the test, the readings of all instruments shall be recorded simultaneously after confirming that the pump has reached stable conditions.
4.4.1.5 The test data and calculation results shall be recorded in the test record table and sorted out, and corresponding curve shall be plotted.
4.4.2 Operation stability
All measurements shall be carried out under stable conditions, and the allowable fluctuation ranges of the indicated values of measuring instruments for the measured parameters shall conform to the requirements of Table 2.
Contents of GB/T 7784-2018
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test implementation
4.1 Test types
4.2 Test organization
4.3 Test devices
4.4 Test conditions
4.5 Measurement uncertainty
4.6 Test items
5 Measurement of parameters
5.1 Flow
5.2 Pressure and vacuum degree
5.3 Temperature
5.4 Pump speed
5.5 Power
6 Data processing
6.1 Flow
6.2 Pressure and vacuum degree
6.3 Pump speed
6.4 Power
6.5 Pump efficiency
6.6 Volume coefficient
6.7 Efficiency of pump unit
6.8 Net positive suction head
7 Plotting of performance curve
8 Test report
Annex A (Informative) Test report form of power reciprocating pump
Annex B (Informative) Schematic diagram of test devices for power reciprocating pump
Annex C (Informative) Estimation and analysis on uncertainty
Annex D (Informative) Noise determination
