Some standard content:
UDC 621. 431. 73 1 534. 5
National Standard of the People's Republic of China
GB11705—89
Testing methods for marine electric thrce-spindle screw pump
Issued on October 74, 1989
State Technical Supervision Bureau
Implemented on May 1, 1990
National Standard of the People's Republic of China
Testlng methods for marine electric three-spindle serew pump
1 Subject content and scope of application
This standard specifies the test items and test methods for marine electric three-spindle screw pump (hereinafter referred to as "marine electric three-spindle screw pump"). 1170589
This standard is applicable to marine electric three-screw pumps, whose conveying media are clean liquids such as fuel oil, oil and hydraulic oil. 2 Reference standards
GB 265 Determination of kinematic viscosity of oil products GJI 150.18 Environmental test methods for military equipment Impact test 3 Terms and symbols
3.1 Terms
3.1.1 Rated working conditions: The working conditions that the pump should reach in the design. They are mainly rated flow rate Q, rated discharge pressure P, rated net suction height h, rated speed, rated medium viscosity and rated medium temperature T, etc. 3.1.2 Actual conditions, focusing on the working conditions during actual operation, mainly flow rate Q, discharge pressure P, net suction height h, speed, medium viscosity and medium temperature T, etc.
3.13 System error: mainly caused by the limitations of the test instrument itself, the upper limit of the instrument calibration and the incompleteness of the measurement method. It is expressed as the difference between the average indication of the test position reading and the true absolute average value of the measured parameter. 31.4 Rated conditions: The specific conditions under which the measured value (or several) of the measured conditions is converted to the value under the rated conditions according to the conversion formula allowed for use.
3.1.5 Vibration intensity: The effective value (root mean square) of the vibration velocity is the parameter that characterizes the vibration intensity. 3.2 Symbols
The relevant quantities in this standard adopt the symbols and general notation shown in Table 1; Table 2 shows the subscripts of the relevant basic symbols expressed in mother or mathematics.
Table 1 Symbols and units
Some general names
Discharge pressure
Approved by the State Administration of Technical Supervision on October 14, 1989
Implementation on May 1, 1990
Basic name
Height of net stage
Pump input power
Transmission efficiency
Reduction efficiency
Volume efficiency
Total efficiency
4 Test method
4.1 Test conditions
4.1.1 Test medium
GB 11705—89
Continued!
Table 2 Letters and numbers used as subscripts
T/unir
Rated operating point
The upper point where the outlet pressure indication is zero
Non-corrosive, non-solid particle lubricating liquid, a.
hThe test medium viscosity is 7.5×10-=1m/s:c.The allowable deviation range of the viscosity of the test medium shall be determined by the supplier through negotiation; when the viscosity of the test medium does not conform to the provisions of the clause, the performance value measured in the test shall be converted into the value under the rated viscosity according to Article 4.6.1.
4.1.2 Bin test equipment
4.1.2.1The test device is shown in the figure below:
GB 1105 --89
Sketch of the test device
1 Test medium rod: 2 Pressure gauge; 3-gate; 4-switch device: 5-flow meter; 6-blade container; 7-separator; 8-oil tank; 9-heating or cooling device: 10-secretor; 1j.-valve: 12-temperature bucket, 13-point pressure gauge The test pump draws the test medium from a large container with a static liquid surface. It must be ensured that the wave entering the pump is not induced by the steel. The suction and discharge lines of the test device should be composed of straight lines parallel to the liquid. , the straight pipe length of the inlet and outlet pipe sections of the test pump shall be no less than 4 times the suction and discharge diameter. 4.1.2.2 Pumps without safety valves shall be equipped with safety valves or other protective devices on the discharge pipe. 4.1.2.3 A filter must be installed in the test chamber, and the filtration accuracy shall be that the largest particle passing through the filter shall not be less than 0.1mm, and the area of the filter through which the water flows shall be 410 times the cross-sectional area of the water outlet. 4.1.2.4 All joints and valves of the suction pipe of the test pump shall be sealed to prevent air from entering. 4.1.2.5 When measuring alarms or noise, the test equipment shall meet the following requirements: the foundation under the unit shall be more than 4 times the unit weight; 5. The unit shall be rigidly fixed on the foundation,
4. 2 Permissible error of test measurement
4.2.1 At the same reading, the short-term change of the reading relative to the average value, its maximum permissible fluctuation degree shall comply with the provisions of Table 3. Table 3 Maximum allowable fluctuation range of readings
Maximum allowable fluctuation range
4.2.2 Same: The allowable error of the value to be measured repeatedly shall comply with the provisions of Table 4. The allowable error is 12a
GB 11705 89
Table 4 Permissible error of repeated measurement of the same quantity (based on 95% confidence limit) Number of repeated measurements
Maximum allowable error: Maximum value, minimum value, maximum value
With quantity, pressure, torque, power
4.2.3 During the test, the working conditions shall be stable and meet the ranges specified in Articles 4.2.1 and 4.2.2, and then the values of all measuring instruments shall be read or recorded at the same time.
4.2.4 The number of measurements of each measured parameter shall be not less than times, and the average value shall be taken. 4.3 Measurement accuracy
The allowable system error of various test measuring instruments shall comply with the provisions of Table 5: 4. 3.1
Table 5 Allowable system error of basic measuring instruments
Measurement parameters
Input power
Motor input power
Running system error
4.3.2 The test instrument shall be accompanied by a qualified seal or a factory certificate, and shall be inspected and calibrated within the specified period of the instrument. It shall have an inspection certificate, and its accuracy shall comply with the requirements of Table 5.
4.4 Test procedures
Test items of pumps
Test run test:
Vehicle performance test:
Full performance test:
Net suction height test;
Safety valve test;
Continuous operation test:
Noise test
h. Self-excited vibration test!
Environmental vibration test;
Impact test;
Fixed tilt test.
The above test items should be selected according to the actual situation. 4.4.2 Test sequence
GB 11705-89
The test sequence recorded is generally test run test, rated working condition performance test, full performance test and net suction height test, and the safety valve test and continuous operation test are carried out at the end. The remaining test sequence is not specified: 4.4.3 Test run test
4.4.3.1 Test run test refers to the running-in test conducted by the assembly shop before the formal test. 4.4.3.2 Test run test The technician should check the assembly quality of the pump and the sound, noise, vibration lubrication, temperature and leakage of the pump during operation. 4.4.3.3 The test run test is to run at no load for 1 hour, then gradually increase the rated discharge pressure by one-fourth, and the running time after each pressure is not less than 10 minutes. It is adjusted to the rated working condition and runs until the bearing temperature is stable. The total running time of the test run test shall not be less than 2 hours. 4.4.3.4 After the test run test, if the pump is disassembled or transferred to another test device, the test run test shall be repeated. 4.4.4 Rated T condition performance test
refers to the measured flow rate and pump input power value at the rated speed, rated net suction head height and rated discharge pressure of the pump. 4.4. 5 Full performance test
4.4.5.1 Full performance test refers to the measured flow rate 4, input power P at the rated speed n and rated net suction head height r of the pump. The relationship between efficiency and discharge pressure.
4.4.5.2 The range of test conditions should be from the full opening of the discharge valve to the opening of the safety valve, and the test conditions should be no less than 8 points. 4.4.5.3 Draw Q, PP, and pn characteristic curves, where the total pressure p = P +4.4.6 Net height test
4.4.6.1 Net suction height test refers to the relationship between flow rate Q and suction height determined when the machine is running at rated speed and rated discharge pressure P.
4.4.6.2 The range of test condition points should start from when the suction pipe valve is fully open, and gradually close the valve until the flow rate drops to 3% of the rated condition flow rate.
4.4.6.3 The test condition points should be no less than 8 points. In the condition area where the flow rate is lower than the rated condition flow rate, the number of test condition points should be appropriately reduced.
4.4.6-4 Draw the characteristic curve.
4.4.7 Safety valve test
4.4.7.1 The safety valve should be tested and adjusted under the rated condition, and sealed after passing the test. 4.4.7.2 Gradually close the discharge pipe valve. The safety valve should operate correctly. When the discharge pipe valve is completely closed, check the full flow repulsion of the safety valve. The test should be carried out at least three times.
4.4.7.3 The opening pressure of the safety chamber should be 1.1~1.15 times of the discharge force; the fully open pressure plate is: when the discharge pressure is greater than -0.5M, it is 1.5 times of the discharge stop force; when the discharge pressure is less than or equal to 0.5MPa, it is the discharge pressure plus 0.25MPa. 4.4.8 Continuous operation test
4.4.8.1 The continuous operation test is carried out under rated conditions, and the test time is as follows: a. 200h for general ship pumps; b. 500h for special ship pumps.
4.4.8.2 During the test, it is not allowed to stop the pump, and no parts shall be replaced during the test. 4.4.8.3 During the test, observe the running status of the object, and measure and record the values of flow rate, discharge force, net suction height, speed and medium overflow every 4 hours.
4.4.8.4 The flow rate under rated working conditions measured before and after the test should decrease by less than 2%. 4.4.8.5 After the test, the test should be dismantled and the wear of the main moving parts and components should be measured. 4.4.9 Noise test
4. 4. 9.1 Generally, only the A-weighted sound pressure level is measured. If necessary, the sound pressure level noise can be measured when ordering. 5
GB11705-89
4.4.9.2 When measuring pump noise indoors, the measuring point should be more than 1m away from any radiator. 4.4.9.3 The background noise should be at least 10 dB(A) lower than the diaphragm noise reading. If the difference between the pump noise and the background noise is 6~10 dI(A), the correction value should be subtracted according to Table 6. If the difference is less than 6dB(A), the measurement should be stopped. The noise in Table 6 and the sound level when the accumulated noise is higher should be corrected to dB(A). 4.4.9.4 When the starter noise is higher than the diaphragm noise, take sound insulation measures for the motor to make it comply with the provisions of Article 4.4.9.3. 4.4.9.5 The human voice level readings at each measuring point are compared with the background noise at each measuring point according to Table 7, and the A-level measurement value Lr4i of each measuring point is obtained. The average vocal level Lp is calculated according to formula (1): (1)
The average A-level of the three measuring points dL(A);
The number of measuring points, -1.2..·
The total number of measuring points:
The A-level value of the :th measuring point,
When the difference between the Lpai values measured at each measuring point does not exceed 5 dB(A), the arithmetic mean value is used to replace the above formula. 4.4.10 Vibration test
4.4.10.1 The vibration is evaluated using the vibration intensity m (root mean square vibration velocity). 4.4.10.2 Self-excited perturbation test
Self-excited vibration is the mechanical vibration caused by the residual unbalanced mass inside the recording. The test points should be selected at the pump auxiliary support and the installation foot. Each test point needs to measure the vibration in the horizontal and vertical directions. 4.4.10.3 Environmental vibration test
4.4.10.3.1 The environmental vibration test is to simulate the environmental vibration of the cabin. Find the resonance point of the pump structure and assess the structural strength of the pump. After the test, the pump can stop running and the parts should not be damaged.
4.4.10.3.2 The pump should be fixed on the vibration test bench according to the fixing method on the ship. The pump should be tested when it is not running. 4.4.10.3.3 The test must be carried out in the horizontal, vertical and vertical directions of the pump in turn. 4.4.10.3.4 The pump is subjected to an exploratory vibration test with an amplitude of 0.5±0.1mm and a frequency conversion within the range of 4-33H. The frequency should be changed at 11Hz discontinuous intervals and maintained at each frequency for 15s. If resonance is found, the resonant frequency and direction should be recorded. 4.4.10.3.5 During the variable frequency test, the amplitude range shown in Table 8 should be shown, and the discontinuous frequency interval should be 1Hz. The vibration time at each frequency is 5 minutes. 4. 4. 10. 3. 6 When there is resonance, the vibration resistance test should be carried out at each common point for 2 h; when there is no resonance or after the resonance is eliminated, the vibration resistance test should be carried out for 38 h for 2 h. The full vibration range of the test bench should be determined according to Table 7, and the excitation rate range is
Full range of vibration table
0. 75±3.15
0. 50±0.:0
0. 25±0.05
4.4.11 Impact test
4.4.11.1 The impact test is only carried out on a single unit in the non-operating state to assess the structural strength, rigidity and connection reliability of the pump station. 6
GB 11705—89
4.4.11.2 For pumps used for important purposes, the impact test shall be carried out in accordance with the A-level regulations in Section 2.1.1 of GB B 150.18, and the others in accordance with the B-level regulations. 4.4.12 Fixed tilt test
4.4.12.1 The fixed tilt test is used to test the reliability of the structure, continuity and performance when the pump is operated in a fixed tilt state. It can replace the test of the reliability of the pump when it is operated in a swaying or tilted state. 4.4.12.2 The layout of the test bench shall comply with the following provisions: a. Horizontal: The axis of a ship pump is kept horizontal, the installation bottom is 20° to the horizontal plane, and the pump auxiliary line is 20° to the water half; for special ship pumps, the above layouts are all 25°h. Vertical attenuation; the axis of a general marine pump is 70° to the horizontal plane, and 65° for a special marine pump. 4.4.12.3 The test should be carried out under rated working conditions and last for 3 minutes. The test results should meet the performance requirements; the object should be able to operate normally after the test; the parts should not be damaged.
4.5 Maximum measurement method
4.5.1 Flow measurement
4.5.1.1 The accuracy of the test instrument for type inspection and sample inspection should not be lower than Class 1. During factory inspection, it is allowed to use a fake meter with an accuracy of not less than Class 1.5.
4.5.1.2 When using volumetric flow measurement, the measuring container should be marked with a scale, and its limit relative error should not exceed 0.5%; the measuring time during measurement should not be less than 208
4.5.1.3 When using the weight method to measure the flow, the measured induction quantity should be less than 0.5% of the measured weight. 4.5-1.4 When using the standard throttling device, it should be ensured that the liquid flow entering the device is a stable flow. 4.5.2 Pressure measurement
4.5.2.1 The accuracy of the test instrument during the test and inspection should not be lower than Grade 1.5: During the factory inspection, it is allowed to use an instrument with an accuracy of not less than Grade 1.5.
4.5.2.2 The reference standard of the recording is as follows:
8: For horizontal pumps, the horizontal plane of the screw auxiliary line is used as the reference plane; for vertical pumps, the horizontal plane at the length of 172 screw rod is used as the reference plane. 4.5.2.3 The full pressure of the recording is calculated according to formula (2), and the static pressure of the discharge outlet and the static pressure of the suction relative to the pump reference plane are shown in Table P - - A, - - G2 -- ( + 9,8 × 10 p(Z ~ ) -Wu Zhong, G. --- Pressure value measured by the instrument at the discharge, MPa; G, --- Pressure value measured by the instrument at the inlet (vacuum gauge value is negative), MPa; Z. --- Vertical distance from the discharge pressure point or the instrument palm to the pump base surface m: % ... The vertical distance from the discharge pressure point or the instrument center to the pump reference surface. (2)
When 9.8×10-22-7.3 is less than the full pressure, it can be ignored. 4.5.2.4 The pressure point is located on the straight section of the suction and discharge pipelines, and the distance from the suction flange and the discharge flange is 2 meters. 4.5.2.5 The diameter of the pressure hole is 2 to 6 mm or the diameter of the pipe at the pressure hole is the smaller of the two. The length should be less than 2 times the hole diameter. The air hole should be perpendicular to the inner wall, and there should be no rear edge. ~. A three-way swivel or pulsator should be installed before the instrument. 4. 5.2. 6 If a pressure gauge is used, a damping device with a certain pressure value equal to the instrument range should be selected. When the measured pressure is greater than the atmospheric pressure, the air in the pipe between the instrument and the measuring hole is filled with liquid. When the measured pressure is less than the atmospheric pressure,Inflating is allowed under certain conditions, but liquid is not allowed to be stored. 4.5.3 Power measurement
4.5.3.3 The input power of the gear refers to the input power of the electric drive; when there is a reducer, it should be the power transmitted by the output shaft of the reducer: its value should be determined by measuring the rotation and torque of the pump or the input power of the motor with known efficiency or by using sensors and other methods. 4.5.3.2 Balance dynamometer
GB 11705-89
a. The center of the balance dynamometer should be on the axis of the rotating shaft: bh. When measuring, the shaft dynamic rate of rated condition should be above its measuring range; insensitivity is expressed by the force length when the dynamometer is separated from the armature and the load is added to make the balance position of the balance pan move when the armature rotates. When the balance pan length is 0.974mm, the insensitivity limit is shown in Table 8; when the pan length is not equal to 0.974mm, the load value decreases or increases proportionally as shown in Table 8. The allowable insensitivity limit at different speeds is N·m
(r/min)
(t/min)
(r/min)
tt/mtn)
0. 2.49 9
d. When measuring the torsional moment, a lever type balance or hunting type balance with an accuracy level of not less than 0.1% should be used. The arm length and lever length on the action arm should be calculated with an error of not more than 0.1%. Table 5.3.3 Torsion dynamometer
When measuring, the input power of the rated working condition should be above the range of its measuring range; a.
h The torsional moment should be measured when the torsional shaft is not subjected to any bending. The accuracy should be ±0.5%,
4.5.3.4 Electric power measurement
. When calculating the output power, the input power of the test motor and the efficiency of the motor should be measured: h, and the value of the rated power should be within 20%--95% of the instrument range; the accuracy of the instrument measuring electrical parameters should not be lower than 0.5 level, and the accuracy of the mutual inductor and shunt should not be lower than 0.2 level. E.
4.5.4 Speed measurement
. When the test equipment fails to reach the rated speed, it is allowed to conduct the test within the deviation of no more than ±6: b. If the test speed does not meet the specified speed due to test conditions, the performance value measured during the test shall be converted into the value at the rated speed according to the calculation formula in Article 4.6.1:
The speed can be measured by tachometer, flash meter, automatic shaft speed counter, and by measuring the average rated speed observation value and slip rate. The measurement accuracy shall comply with the provisions of Article 4.4.
4.5.5 Temperature measurement
should be measured at a position not less than 4 times the pipe diameter before the recording inlet; a.
The measuring part of the thermometer or temperature sensor should be directly exposed to the medium or placed in a thin-walled metal cylinder. The medium flows through the cylinder and the cylinder is filled with minerals:
The scale of the thermometer should not be larger than 1 meter.
4.5.6. Viscosity measurementbZxz.net
GE 17705-89
should be in accordance with GB265 or provide the viscosity-temperature variation curve of the test medium. 4.6 Calculation and evaluation of test results
4.6.1 Performance conversion
rent. Flow rate: When the actual speed and the measured medium viscosity do not match the rated viscosity, the flow rate at the rated speed is converted according to formula (3): 4 = Q
(--0)
Input power: When the actual speed and the measured medium viscosity do not match the rated viscosity. The input power at the rated speed is converted according to formula (4): [Final type
P. - P.-H
Year 6.2 Efficiency calculation
a. Volumetric efficiency:
Mechanical efficiency:
Total efficiency:
Medium: P-1020
4.6.3 Characteristic curve
4.6.3.1 The characteristic curve should adopt the following formula! R
x 100%
\（4）
（6）
The performance curve is shown as follows: the horizontal axis represents the suction force; the vertical axis represents the flow rate, input power P, volumetric efficiency and efficiency 8
The suction performance curve is shown as follows: the horizontal axis represents the net suction height, the vertical axis represents the suction height, and the horizontal axis represents the suction height. 4.6.3.2 The performance curve should be drawn after the test under the rated working condition or the test calculation is made according to the relevant formula in Article 4.6.1. Additional instructions,
The tender is proposed by China Shaoguan Industry Corporation. This standard is prepared by the China Marine Machinery Standardization Technical Committee, and the Shanghai Ship Equipment Research Institute of China Shipbuilding Industry Corporation is responsible for drafting. The main contributors to this standard are Li Futian,1. The relevant formulas are drawn after performance conversion, with additional explanations.
The tender is proposed by China Shaoguan Industry Corporation. This standard is prepared by the China Marine Machinery Standardization Technical Committee, and the Shanghai Ship Equipment Research Institute of the China Shipbuilding Industry Corporation is responsible for drafting. The main contributor of this standard is Li Futian,1. The relevant formulas are drawn after performance conversion, with additional explanations.
The tender is proposed by China Shaoguan Industry Corporation. This standard is prepared by the China Marine Machinery Standardization Technical Committee, and the Shanghai Ship Equipment Research Institute of the China Shipbuilding Industry Corporation is responsible for drafting. The main contributor of this standard is Li Futian,
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