Some standard content:
ICS23.080
Machinery Industry Standard of the People's Republic of China
JB/T8697-1998
Diaphragm pump
Diaphragmpump
Published on March 19, 1998
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1998
JB/T8697-1998
1 Scope
2 Reference standards
3 Definition
4 Basic This parameter
5 Technical requirements,
6 Test methods
Inspection rules
8 Marking, packaging and storage
Appendix A (suggestive appendix)
Appendix B (suggestive appendix)
Appendix C (suggestive appendix)
Basic parameters
Simplified diagram of pump test device
Diaphragm pump product test record
JB/T8697-1998
Appendix A, Appendix B and Appendix C of this standard are all suggestive appendices. This standard is published for the first time.
This standard is proposed and managed by the Volume Pump Sub-Technical Committee of the National Pump Standardization Technical Committee. The responsible drafting unit of this standard: Hefei General Machinery Research Institute, Ministry of Machinery Industry. The main drafters of this standard: Ye Xiaoyan, Zhang Shengchang, Zhao Sheng.
Mechanical Industry Standard of the People's Republic of China
Diaphragm pump
Diaphragm pump
JB/T8697-1998
This standard specifies the basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of diaphragm pumps. This standard is applicable to motorized hydraulic diaphragm pumps (hereinafter referred to as pumps) that convey media with a temperature of 5~120℃, a viscosity of 03~850mm2/s, a particle size of ≤8mm, and a concentration of ≤75%. Its rated flow range is ≤630m2h; the rated discharge pressure range is ≤25MPa. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T 1029—93
GB1032—85
GB 1311——89
GB 255595
GB2556—95
GB 3836.1—83
GB 778487
GB778587
GB 906988
GB1147389
GB/T 1330691
GB/T 1338492
ZB J71 01890
Test methods for three-phase synchronous motors
Test methods for three-phase asynchronous motors
Test methods for DC motors
Dimensions of pipe flange connections for general purposes
Shape and dimensions of sealing surfaces for pipe flanges for general purposesGeneral requirements for explosion-proof electrical equipment for explosive atmospheresTest methods for motorized reciprocating pumps
Classification and terminology of reciprocating pumps
Determination of sound power level of noise of reciprocating pumps
Engineering method
Method for compiling reciprocating pump models
General technical conditions for packaging of electromechanical products
Hydraulic pressure and leakage test of reciprocating pump parts and componentsIn addition to the terms and terms specified in GB7785, this standard also adopts the following definitions. 3.1 Particle size
The maximum linear size of particles in a medium containing solid particles. 3.2 Concentration
The weight ratio of solid particles to the medium in the medium. 3.3 Hydraulic type
The periodic flexural deformation of the diaphragm is driven by the hydraulic medium in the hydraulic chamber. 3.4 Hydraulic chamber
A hydraulic medium chamber connected to the working chamber of the plunger (or piston). Approved by the Ministry of Machinery Industry on March 19, 1998
Implemented on July 1, 1998
Basic parameters
JB/T 8697-1998
The basic parameters of the pump are shown in Table A1 in Appendix A (Suggested Appendix). The plunger (piston) diameter of the pump is shown in Table A2 in Appendix A. The model of the pump shall comply with the provisions of GB11473. 5 Technical requirements
The pump shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. If the customer has special requirements for the pump, it can be manufactured according to the contract. The pump shall meet the continuous working system under rated conditions (continuous operation means that the pump runs continuously for 8 to 24 hours a day under rated conditions). 5.4 The pump should be able to operate safely under the opening pressure of the safety valve and the rated speed. Other measures can also be taken to ensure the safe operation of the pump under the specified overpressure value.
5.5 The pump should meet the following conditions when in operation: a) The liquid replenishing device must operate normally;
b) The static sealing surfaces must not leak, and the liquid reservoir must not leak; c) The lubricating oil pressure and oil level are within the specified range, and the oil temperature of the oil pool does not exceed 75°C; d) There is no abnormal sound and vibration;
e) The pump should not exceed the rated working condition of the pump when it is working continuously. 5.6 The performance indicators of the pump under rated working conditions shall comply with the provisions of Table 1. Table 1
Flow
Minimum pump efficiency
Required net positive suction pressure head
Minimum pump volume coefficient
5.7 The noise of the pump when in operation shall comply with the provisions of Table 2. >10-20
（95%-110%)9
Not greater than rated value
>20~25
5.8 Under the condition of complying with the operating rules, the cumulative operating life from the pump being put into operation to the first overhaul (wearing parts can be replaced) shall not be less than 12000h
5.9 The pump's inlet and outlet flanges shall comply with the provisions of GB2555 and GB2556. The pump shall have inlet and outlet interfaces for flushing, and the pump shall have other interface requirements in accordance with the provisions of 5.2. 5.10 The hydraulic medium used in the hydraulic chamber shall contain defoaming, anti-rust and preservatives 5.11 The pump system shall be equipped with a safety valve or other forms of overpressure protection devices. The opening pressure of the safety valve can be adjusted to 1.05~1.25 times the rated discharge pressure, and the maximum opening pressure shall not be greater than the hydraulic test pressure of the pump. 2
Rated input power
>11-37
>37-75
>75~150
>150-280
JB/T8697-1998
>10-20
> 20~-25
For noise indicators not specified in the table,
can be implemented according to 5.2. The noise indicators specified in the table do not include the noise of the prime mover. Note:
The action of the safety valve in the hydraulic chamber of the diaphragm pump should be sensitive and reliable. Its opening pressure is in accordance with the provisions of Table 3. The discharge pressure is 1.05~1.1 times the opening pressure, and the return pressure should be greater than 0.7 times the opening pressure. Table 3
Rated discharge pressure of pump Par
Opening pressure of safety valve P
Par+04
The action of automatic filling valve of pump should be sensitive and reliable to ensure normal filling.
The parts and components of pump under pressure should be subjected to hydraulic test, and the test shall be carried out in accordance with the provisions of ZBJ71018. Under the rated discharge pressure of pump, the leakage of plunger or piston rod seal shall not exceed the provisions of Table 4, Table 4
Rated flow of pump
Leakage
>8.0-25.0
5.16When the transmission end adopts pressure lubrication system, there shall be filter, oil pressure gauge and low oil pressure alarm device in the lubrication system. The accuracy of oil filter shall not be less than 100
μm.
The design life of main bearing of the machine body under rated working condition shall not be less than 25000h. 5.17
5.18 The tightening torque of connecting rod bolts and nuts, diaphragm head bolts and nuts under high pressure and other important threaded connections should be specified. 5.19
Exposed moving parts should have protective covers.
The pump should have special tools for installation and maintenance. When the pump is used in an explosive environment, the explosion-proof type, category, level and temperature group of the motor and electrical equipment should comply with the provisions of Appendix A of GB3836.1-83.
The replacement time of the main wearing parts of the pump should not be less than the provisions of Table 5, or it can be in accordance with the contract provisions. 3
Name of wearing parts
Liquid inlet and outlet valve group
Piston ring, packing
5.23 The pump supplied as a complete set shall include:
a) 1 pump;
b) 1 prime mover;
c) no less than 12 sets of random spare parts;
d) 1 set of special tools;
e) 1 set of random documents.
JB/T8697-1998
>10-20
If the above supply scope and quantity are increased or decreased, they shall be in accordance with the contract. > 20~25
5.24 If the customer complies with the provisions of the instruction manual and uses the pump correctly, the manufacturer shall be responsible for free repair or replacement of parts within 12 months from the date of shipment for damage or malfunction caused by improper design, manufacturing or material selection. 6 Test method
6.1 Test systembzxZ.net
6.1.1 The schematic diagram of the test system is shown in Appendix B (Reminder Appendix). 6.1.2 The medium used in the test is generally clean water or emulsion at 0-50℃. When it is not suitable to use water or emulsion for testing, the corresponding medium or mineral oil can be used according to the design requirements. If the customer has clear requirements for the test medium, it shall be implemented according to the contract. 6.1.3 A safety valve or other overpressure protection device shall be installed on the discharge pipeline of the pump. 6.1.4 The pressure allowed by the discharge pipeline shall be compatible with the maximum discharge pressure of the pump under test. 6.1.5 The joints of the suction pipeline shall not leak to prevent the outside air from entering the pipeline. 6.1.6 A sufficiently large air chamber or other pulsation absorption device shall be installed on the discharge pipeline to ensure that the fluctuation range of the indicated value of the pressure gauge and flow measurement instrument meets the measurement requirements.
6.1.7 During the cavitation performance test, when the suction pressure is lower than the atmospheric pressure, a sufficiently large vacuum container shall be installed on the suction pipeline or the test shall be carried out at the specified suction height. The test shall not be carried out by simply adjusting the suction resistance. 6.2 Test requirements
The test shall be carried out on a test device that meets the requirements of 6.1 or on a field process. 6.2.1
The test shall reach the rated working condition. The allowable deviation of each parameter value under the test working condition shall comply with the provisions of Table 6. Table 6
Working condition item
Pump discharge pressure P
Pump suction pressure P
Pump speed or rotation speed n
Not less than the rated value
Allowable deviation of measured value
Effective net positive suction head (NPSHa) is greater than its rated value (NPSHr) Rated value ± 5%
JB/T8697-1998
3When the test pump speed deviates from the rated pump speed, it shall be converted according to the provisions of 6.5.1.2 and 6.5.4.3. The relationship curve between pump speed and 6.2.3
pressure difference shall be given on the performance curve.
The allowable fluctuation range of the instrument indication value shall comply with the provisions of Table 7. For any test that requires the measurement of parameters,
The instrument of the measured parameter,
The measured parameter
Discharge pressure Pa
Suction pressure Ps
Flow rate Q
Pump speed or rotation speed n
Allowable fluctuation range
Measured parameter
Body temperature t
Pump input power Pin
Prime mover input power Par
1) When the rotation speed or pump speed is calculated by measuring the accumulated rotation speed or pump speed, it is not subject to this limitation. 6.2.5
Allowable fluctuation range
±2℃
The system error of the measuring instrument and individual
The measurement error of the measured quantity shall be guaranteed not to be greater than the provisions of Table 8. All measuring instruments and meters shall be within the effective period of use and have the appraisal certificate issued by the metrology department or relevant departments. Table 8
Allowable range
Measured quantity
Pump input power
Type and spot check test
Factory test
During the test, all instrument readings should be read and recorded at the same time after confirming that the pump operation has reached a stable working condition. The measurement times of each measured parameter should be no less than 3 times, and the arithmetic mean value should be taken as the measured value. The test data and calculation results should be recorded in the test record table, sorted and plotted. 6.2.7
For the error analysis and calculation method of the test system, see Appendix B in GB7784-87. The total error shall comply with the provisions of Table 9
Total error allowable range
Measured quantity
Pump input power
Pump efficiency
Test items
Type and spot check test
Factory test
6.3.1 Trial operation
JB/T8697-1998
6.3.1.1 Before the trial operation, the pump shall be debugged to the normal state. 6.3.1.2 The trial operation is mainly to check the assembly quality and run the pump. 6.3.1.3 The trial operation includes no-load test and load-raising test: a) The no-load test shall be carried out with the inlet and outlet pipeline valves fully opened and liquid transported, and the test shall not be less than 0.5h; b) The load-raising test shall be carried out at the rated pump speed, when the discharge pressure gradually rises from normal pressure to the rated discharge pressure. Pumps with rated discharge pressure greater than 5MPa can be tested for load increase at four levels. The operation time for each pressure level shall not be less than 15min6.3.1.4 The sound, vibration, lubrication, temperature rise, leakage, fluid replenishment, exhaust and all protective devices of the pump shall be normal during the test run. 6.3.2 Load operation test
The load operation test shall be carried out after the test run, and the pump shall be operated for 2h at the rated pressure difference and maximum pump speed, and the contents specified in 6.3.1.4 shall be observed and recorded. 6.3.3 Continuous operation test
6.3.3.1 The continuous operation test shall be carried out after the test run, and the pump shall be operated continuously for a total of 500h under rated working conditions. The machine may be stopped during the test to check the operation status. If the main components are damaged and need to be replaced, the completed test shall be invalid. 6.3.3.2 During the test, the flow rate, pressure, pump speed, power, lubricating oil temperature, medium temperature and stuffing box leakage shall be recorded regularly (usually 4~8h).
6.3.3.3 The life of wearing parts, number of repairs and downtime should be recorded during the test. After the test, the pump should be disassembled and inspected and the wear and damage of pump parts and components should be recorded.
6.3.4 Performance test
6.3.4.1 The performance test should determine the relationship between flow rate, power, pump efficiency and pressure difference, and draw a performance curve. 6.3.4.2 The performance test shall be conducted at the rated suction pressure (if the rated suction pressure cannot guarantee that cavitation does not occur in the pump, or the rated suction pressure is much greater than the vaporization pressure of the test liquid, or the test device cannot meet the requirements of the rated suction pressure, the suction pressure may be increased or decreased for performance test, but the discharge pressure shall be changed accordingly to ensure that the pressure difference is the rated value) and the maximum pump speed. The discharge pressure shall start from the minimum value (the discharge pressure required to overcome the resistance of the test system when the valve of the discharge pipeline is fully open), and then increase the pressure by 25%, 50%, 75%, and 100% of the rated pressure difference. At each discharge pressure, the medium temperature, pump speed, flow rate, power, suction pressure, and discharge pressure shall be measured and recorded at the same time.
6.3.5 Adjustment performance test
6.3.5.1 The adjustment performance test shall determine the relationship between flow rate, power, pump efficiency and pump speed. 6.3.5.2 The adjustment performance test shall be conducted at the rated suction pressure and rated discharge pressure. The pump speed shall start from the rated minimum value to the maximum value. Test five pump speeds (including minimum and maximum). Test points should be evenly distributed, and the values of pump speed, flow rate, power, suction pressure and discharge pressure should be measured and recorded at the same time.
6.3.6 Cavitation performance test
6.3.6.1 The cavitation performance test should determine the relationship between flow rate and net positive suction head (NPSH), and find out the required net positive suction head (NPSHr) of the pump.
6.3.6.2 The cavitation performance test should be carried out at rated discharge pressure and maximum pump speed. NPSH starts from the maximum value (the maximum value that can be established when the suction pipeline valve is fully open) and measures each value according to 6.3.4.2. Then gradually reduce NPSH until the flow rate is 5%~10% lower than the normal flow rate. There should be no less than 8 test points. When the pump is close to cavitation, the interval between test points should be appropriately shortened. 6.3.6.3NPSHr is determined by one of the following two parameters: a) When other conditions remain unchanged, the pump flow rate decreases by 3% b) Due to the decrease in pump flow rate, the pump discharge pressure decreases by 4% (there is a throttling element on the discharge side of the pump, and the pump speed remains unchanged). 6.3.7 Rated operating point performance check
Rated operating point performance check should check whether the flow rate reaches the rated value under NPSHr, rated discharge pressure and rated pump speed. 6.3.8 Safety valve test
JB/T 8697-1998
6.3.8.1 The safety valve should be pressure tested and adjusted, and lead sealed after passing the test. 6.3.8.2 Gradually close the discharge pipeline valve, increase the discharge pressure, and at 5.11 The safety valve should be sensitive under the specified opening pressure, and the test should be carried out for no less than 3 times. For disposable safety valves, they can be debugged separately. 6.3.9 Noise test
The noise measurement of the pump shall be in accordance with the provisions of GB9069. 6.4 Parameter measurement and instrumentation
6.4.1 Flow
6.4.1.1 Flow measurement generally adopts the volumetric method, mass method, flow meter method or other measurement methods. 6.4.1.2 When the volumetric method (i.e. measuring the time required to fill a certain volume) is used to measure the flow, the container should have a scale. The relative limit error of the container calibration is not more than 0.5%, and the measurement liquid level difference is at least 200mm. 6.4.1.3 When the mass method (i.e. measuring the mass of the liquid within a certain time interval) is used to measure the flow, the sensitivity of the scale should be less than 0.5% of the mass being measured; it is generally used to measure liquids that are difficult to discharge gas. 6.4.1.4 When the flow meter method is used to measure the flow, it should be ensured that the liquid flow entering the throttling device is a steady pressure flow. The flow meter accuracy shall not be less than Class 1 for type and spot check tests; and not less than Class 1.5 for factory tests. 6.4.1.5 When measuring viscous or volatile liquids, a suitable volumetric flow meter shall be used. 6.4.1.6 When measuring flow, an electrical or mechanical interlock shall be used between the timing device or counting device and the flow meter, container level measuring device, and liquid flow reversing device to ensure synchronization between the two. 6.4.1.7 When measuring flow using the volumetric method, mass method, and digital flow meter, the time interval shall be at least 20 seconds. 6.4.2 Pressure and vacuum
6.4.2.1 Pressure and vacuum shall be measured using a spring-loaded pressure gauge, vacuum gauge, pressure sensor, or other type of pressure gauge. 6.4.2.2 The accuracy level of the pressure measuring instrument is: not less than 0.5 level for type and spot check tests; not less than 15 level for factory tests. 6.4.2.3 The location of the pressure measuring hole is usually set on the discharge side and suction side of the pump. On the circumference of the straight pipe connected to a diameter greater than 4 times the diameter of each and 2 times the diameter of the flange surface on the discharge (or suction) side of the pump, the distance from the valve of the discharge and suction pipelines should be greater than 6 times the discharge (or suction) diameter and should not be less than 300mm. In the case of an air chamber, it is allowed to measure the pressure on the air chamber. 6.4.2.4 The pressure measuring hole should be manufactured according to the requirements shown in Figure 1. The axis of the hole should be perpendicular to the inner wall of the pipe, the edge should not have burrs or flash, the surrounding should be smooth and flush, and the intersection with the inner wall of the pipe should maintain the edges. The diameter of the pressure measuring hole is 2~6mm or equal to 1/10 of the diameter, whichever is smaller. The hole depth should not be less than 2.5 times the hole diameter. os
d=2~6 or
+1/10 diameter
(take the smaller of the two)
d=2~6 or 1/10 diameter
(take the smaller of the two)
6.4.2.5 If a straight pipe with 4 times the diameter cannot be installed due to the size of the pump or the test device, or the same measurement method as on-site is used, the pressure can also be measured at the pump outlet flange or its vicinity according to the contract. 6.4.2.6 When the pressure is higher than the atmospheric pressure, the air in the connecting pipe between the instrument and the pressure measuring hole should be exhausted, filled with the test medium, and the instrument indication value should be read. When the pressure is lower than the atmospheric pressure, air should be injected into the connecting pipe between the instrument and the pressure measuring hole, the test medium should be exhausted, and the instrument indication value should be read. 7
JB/T8697-1998
6.4.2.7 In order to reduce the pulsation of pressure (or vacuum) during measurement, a pulsation damping device is allowed to be installed in front of the instrument. The swing range of the instrument pointer should comply with the provisions of Table 7, and the indicated value at 2/3 of the pointer swing is taken as the measured value. 6.4.2.8 The range of the pressure gauge should be selected so that the indicated average value is 1/3~2/3 of the full scale. 6.4.3 Temperature
6.4.3.1 The temperature of the liquid and the temperature of the pump parts shall be measured by glass mercury thermometer, thermocouple, resistance thermometer, semiconductor thermometer or other types of temperature measuring instruments, and the limit error shall not exceed 1°C. 6.4.3.2 The temperature measurement point shall be set at the place with the smallest temperature field disturbance, the best heat transfer and the least heat dissipation. 6.4.3.3 The medium temperature is measured in the pump discharge (or suction) pipeline, and the temperature sensing part of the thermometer should be placed completely in the medium. 6.4.3.4 When measuring the medium temperature of the pipeline and the duct, the thermometer should be installed in the countercurrent or at a 45° angle to the countercurrent direction. 6.4.4 Pump speed
6.4.4.1 The pump speed should be measured by a tachometer with a stopwatch, a photoelectric tachometer, a digital tachometer or other instruments. The accuracy level of the measuring instrument is: the type and spot check test should not be less than 0.2%, and the factory test should not be less than 0.5%. 6.4.4.2 The pump speed can also be measured by measuring the cumulative number of reciprocating times within a certain time interval, and then calculating the average value or measuring the speed of the motor or other rotary prime mover, and then converting it into the pump speed. 6.4.4.3 When calculating the pump speed by measuring the cumulative number of reciprocating times or speed, the measurement time interval should be the same as the time interval of the flow measurement, and it should be carried out simultaneously.
6.4.4.4 When the time intervals required for flow and pump speed measurement are different, the parameter with the shorter time interval should be measured multiple times (within the measurement time interval of the other parameter), and the arithmetic mean should be taken as the measured value. 6.4.5 Power
6.4.5.1 The input power of the pump can be obtained by directly measuring the input torque and speed of the pump shaft using a torque-speed meter. The accuracy level of the instrument should not be less than 1%, and the range should be above 12 of its rated torque. 6.4.5.2 The input power of the pump can also be calculated by measuring the input power of the motor with a known efficiency curve. 6.4.5.3 The motor input power should be measured at the motor input terminal. The three-phase AC motor is measured using the two-wattmeter method or the three-wattmeter method, and the DC motor is measured using the voltage-current meter method. The instrument accuracy is as specified in Table 10. During the test, the meter indication value should be above 1/3 of the full scale. An exception may be made when using a two-wattmeter to measure three-phase power, but the indicated current and voltage values should not be less than 60% of the rated current and voltage values of the wattmeter. Table 10
Ammeter
Voltmeter
Wattmeter
Transformer
The accuracy level should not be less than
6.4.5.4 When calculating the output power of the motor, follow the relevant provisions of GB1311, GB/T1029 and GB1032. 6.5 Data processing
6.5.1 Flow rate
6.5.1.1 The flow rate at the test pump speed should be calculated according to formula (1) and formula (2): Volume method:
Mass method:5 times the aperture. os
d=2~6 or
+1/10 diameter
(take the smaller of the two)
d=2~6 or 1/10 diameter
(take the smaller of the two)
6.4.2.5 If a straight pipe of 4 times the aperture cannot be installed due to the size of the pump or the test device, or the same measurement method as on-site is used, the pressure can also be measured at the pump outlet flange or its vicinity according to the contract. 6.4.2.6 When the pressure is higher than the atmospheric pressure, the air in the connecting pipe between the instrument and the pressure measuring hole should be exhausted, filled with the test medium, and the instrument indication value should be read. When the pressure is lower than the atmospheric pressure, air should be injected into the connecting pipe between the instrument and the pressure measuring hole, the test medium should be exhausted, and the instrument indication value should be read. 7
JB/T8697-1998
6.4.2.7 In order to reduce the pulsation of pressure (or vacuum) during measurement, a pulsation damping device is allowed to be installed in front of the instrument. The swing range of the instrument pointer should comply with the provisions of Table 7, and the indicated value at 2/3 of the pointer swing is taken as the measured value. 6.4.2.8 The range of the pressure gauge should be selected so that the indicated average value is 1/3~2/3 of the full scale. 6.4.3 Temperature
6.4.3.1 The temperature of the liquid and the temperature of the pump parts shall be measured by glass mercury thermometer, thermocouple, resistance thermometer, semiconductor thermometer or other types of temperature measuring instruments, and the limit error shall not exceed 1°C. 6.4.3.2 The temperature measurement point shall be set at the place with the smallest temperature field disturbance, the best heat transfer and the least heat dissipation. 6.4.3.3 The medium temperature is measured in the pump discharge (or suction) pipeline, and the temperature sensing part of the thermometer should be placed completely in the medium. 6.4.3.4 When measuring the medium temperature of the pipeline and the duct, the thermometer should be installed in the countercurrent or at a 45° angle to the countercurrent direction. 6.4.4 Pump speed
6.4.4.1 The pump speed should be measured by a tachometer with a stopwatch, a photoelectric tachometer, a digital tachometer or other instruments. The accuracy level of the measuring instrument is: the type and spot check test should not be less than 0.2%, and the factory test should not be less than 0.5%. 6.4.4.2 The pump speed can also be measured by measuring the cumulative number of reciprocating times within a certain time interval, and then calculating the average value or measuring the speed of the motor or other rotary prime mover, and then converting it into the pump speed. 6.4.4.3 When calculating the pump speed by measuring the cumulative number of reciprocating times or speed, the measurement time interval should be the same as the time interval of the flow measurement, and it should be carried out simultaneously.
6.4.4.4 When the time intervals required for measuring flow and pump speed are different, the parameter with the shorter time interval should be measured multiple times (within the measurement time interval of the other parameter), and the arithmetic mean should be taken as the measured value. 6.4.5 Power
6.4.5.1 The input power of the pump can be obtained by directly measuring the input torque and speed of the pump shaft using a torque-speed meter. The accuracy level of the instrument should not be less than 1%, and the range should be above 12 of its rated torque. 6.4.5.2 The input power of the pump can also be calculated by measuring the input power of the motor with a known efficiency curve. 6.4.5.3 The motor input power should be measured at the motor input terminal. The three-phase AC motor is measured using the two-wattmeter method or the three-wattmeter method, and the DC motor is measured using the voltage-current meter method. The instrument accuracy is as specified in Table 10. During the test, the meter indication value should be above 1/3 of the full scale. An exception may be made when using a two-wattmeter to measure three-phase power, but the indicated current and voltage values should not be less than 60% of the rated current and voltage values of the wattmeter. Table 10
Ammeter
Voltmeter
Wattmeter
Transformer
The accuracy level should not be less than
6.4.5.4 When calculating the output power of the motor, follow the relevant provisions of GB1311, GB/T1029 and GB1032. 6.5 Data processing
6.5.1 Flow rate
6.5.1.1 The flow rate at the test pump speed should be calculated according to formula (1) and formula (2): Volume method:
Mass method:5 times the aperture. os
d=2~6 or
+1/10 diameter
(take the smaller of the two)
d=2~6 or 1/10 diameter
(take the smaller of the two)
6.4.2.5 If a straight pipe of 4 times the aperture cannot be installed due to the size of the pump or the test device, or the same measurement method as on-site is used, the pressure can also be measured at the pump outlet flange or its vicinity according to the contract. 6.4.2.6 When the pressure is higher than the atmospheric pressure, the air in the connecting pipe between the instrument and the pressure measuring hole should be exhausted, filled with the test medium, and the instrument indication value should be read. When the pressure is lower than the atmospheric pressure, air should be injected into the connecting pipe between the instrument and the pressure measuring hole, the test medium should be exhausted, and the instrument indication value should be read. 7
JB/T8697-1998
6.4.2.7 In order to reduce the pulsation of pressure (or vacuum) during measurement, a pulsation damping device is allowed to be installed in front of the instrument. The swing range of the instrument pointer should comply with the provisions of Table 7, and the indicated value at 2/3 of the pointer swing is taken as the measured value. 6.4.2.8 The range of the pressure gauge should be selected so that the indicated average value is 1/3~2/3 of the full scale. 6.4.3 Temperature
6.4.3.1 The temperature of the liquid and the temperature of the pump parts shall be measured by glass mercury thermometer, thermocouple, resistance thermometer, semiconductor thermometer or other types of temperature measuring instruments, and the limit error shall not exceed 1°C. 6.4.3.2 The temperature measurement point shall be set at the place with the smallest temperature field disturbance, the best heat transfer and the least heat dissipation. 6.4.3.3 The medium temperature is measured in the pump discharge (or suction) pipeline, and the temperature sensing part of the thermometer should be placed completely in the medium. 6.4.3.4 When measuring the medium temperature of the pipeline and the duct, the thermometer should be installed in the countercurrent or at a 45° angle to the countercurrent direction. 6.4.4 Pump speed
6.4.4.1 The pump speed should be measured by a tachometer with a stopwatch, a photoelectric tachometer, a digital tachometer or other instruments. The accuracy level of the measuring instrument is: the type and spot check test should not be less than 0.2%, and the factory test should not be less than 0.5%. 6.4.4.2 The pump speed can also be measured by measuring the cumulative number of reciprocating times within a certain time interval, and then calculating the average value or measuring the speed of the motor or other rotary prime mover, and then converting it into the pump speed. 6.4.4.3 When calculating the pump speed by measuring the cumulative number of reciprocating times or speed, the measurement time interval should be the same as the time interval of the flow measurement, and it should be carried out simultaneously.
6.4.4.4 When the time intervals required for measuring flow and pump speed are different, the parameter with the shorter time interval should be measured multiple times (within the measurement time interval of the other parameter), and the arithmetic mean should be taken as the measured value. 6.4.5 Power
6.4.5.1 The input power of the pump can be obtained by directly measuring the input torque and speed of the pump shaft using a torque-speed meter. The accuracy level of the instrument should not be less than 1%, and the range should be above 12 of its rated torque. 6.4.5.2 The input power of the pump can also be calculated by measuring the input power of the motor with a known efficiency curve. 6.4.5.3 The motor input power should be measured at the motor input terminal. The three-phase AC motor is measured using the two-wattmeter method or the three-wattmeter method, and the DC motor is measured using the voltage-current meter method. The instrument accuracy is as specified in Table 10. During the test, the meter indication value should be above 1/3 of the full scale. An exception may be made when using a two-wattmeter to measure three-phase power, but the indicated current and voltage values should not be less than 60% of the rated current and voltage values of the wattmeter. Table 10
Ammeter
Voltmeter
Wattmeter
Transformer
The accuracy level should not be less than
6.4.5.4 When calculating the output power of the motor, follow the relevant provisions of GB1311, GB/T1029 and GB1032. 6.5 Data processing
6.5.1 Flow rate
6.5.1.1 The flow rate at the test pump speed should be calculated according to formula (1) and formula (2): Volume method:
Mass method:
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