This standard specifies the types and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and complete set supply scope of small and medium-sized axial flow submersible electric pumps. JB/T 10377-2002 Small and medium-sized axial flow submersible electric pumps JB/T10377-2002 Standard download decompression password: www.bzxz.net

ICS23.080
Machinery Industry Standard of the People's Republic of China
JB/T 10377--2002
Middle and small axial flow submersible electric pumps
Middle and small axial flow submersible electric pumps2002-12-27Promulgated
Implementation on 2003-04-01
Promulgated by the State Economic and Trade Commission of the People's Republic of ChinaForeword
Scope,
Normative reference documents
Types and basic parameters.
Type,
Model indication method,
Basic parameters.
Technical requirements
Environmental conditions for the use of electric pumps,
Electric pump performance
Electric motor
Structural design
Main parts and materials
Test methods
Inspection rules
Type inspection.
Factory inspection
Warranty period.
Marking, packaging, transportation and storage
8.4 Storage
9 Scope of complete set,| |tt||Appendix A (Normative Appendix) Basic Parameters of Small and Medium Axial Flow Submersible Pumps Appendix B (Informative Appendix) Data Sheet of Axial Flow Submersible Pumps Figure A.1 Working Range of Small and Medium Axial Flow Submersible Pumps Figure A.2 Pump Efficiency of Small and Medium Axial Flow Submersible Pumps Table 1 Guaranteed Values ​​of Motor Efficiency and Power Factor Table 2 Tolerance of Guaranteed Values ​​of Motor Electrical Performance Table 3 Temperature Rise Limits of Motor Stator Windings
Table 4 Markings of Motor Winding Outlet Terminals
Table A.1 Basic Parameters of Small and Medium Axial Flow Submersible Pumps Table B.1 Data Sheet of Axial Flow Submersible Pumps
JB/T 10377—2002
JB/T10377--2002
Appendix A of this standard is a normative appendix, and Appendix B is an informative appendix. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Pump Standardization. The drafting units of this standard are: China Agricultural Mechanization Science Research Institute, Hefei Sanyi Motor Pump Co., Ltd., Shanghai Kaiquan Pump Industry (Group) Co., Ltd., Jiangsu Taifeng Submersible Pump Factory (Group), Zhejiang Xiaoshan Puchao Pump Co., Ltd. The main drafters of this standard are: Xu Guangyuan, Xu Jingji, Xia Dingliang, Mao Ji, Jiang Yuexing. 1 Scope
Small and medium-sized axial flow submersible electric pumps
JB/T10377—2002
This standard specifies the types and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and complete set supply scope of small and medium-sized axial flow submersible electric pumps (hereinafter referred to as electric pumps). This standard is applicable to three-phase axial flow submersible electric pumps for conveying clean water or light sewage and other liquids with similar physical and chemical properties. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated application document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated application document, its latest version is applicable to this standard. GB/T191-2000 Packaging, storage and transportation pictorial marking (EVISO780:1997) GB755-2000 Ratings and performance of rotating electrical machines (IDTEC60034-1996) GB/T1184-1996 Shape and position tolerances without tolerance values ​​(ISO2768-2:1989) GB1971 Motor line end marking and rotation direction GB/T3216-1989 Test methods for centrifugal pumps, vortex pumps, axial flow pumps and vortex pumps (EQYISO2548:1973) GB4942.1-2001 Rotating electrical machine housing protection classification (P code) (IDTEC60034-5:1991) GB/T9239-1988 Determination of allowable imbalance of rigid rotor balance quality GB/T 12785—2002
Test methods for submersible electric pumps
GB/T 13008--1991
Technical requirements for hybrid pumps and axial flow pumps
GB/T 13306
GB/T 13384
General technical software for packaging of electromechanical products
JB/T4297 Technical requirements for can coating of pump products
JB/T 5413—1991
Technical conditions for acceptance of mixed flow and axial flow open blades JB/T6880.1 Grey iron castings for pumps
JB/T6880.2 Castings for pumps
JB/8687 Sampling inspection of pump products
JBT9615.1-2000 Test method for interturn insulation of scattered-embedded windings of AC low-voltage motors JB/T9615.2—2000 Test limits for interturn insulation of scattered-embedded windings of AC low-voltage motors JBT10098—2000: Impact voltage withstand level of formed coils of stators of AC motors (idLJEC60034-15:1995) 3 Types and basic parameters
3.1 Type
3.1.1 The pump is coaxial with the motor and can work submerged in liquid for a long time. The motor is a three-wire motor with different tension. 3.1.2 The motor is dry type, water-filled type or oil-filled type. 3.1.3 The structure of the electric pump is divided into three types: a) Lower pump type: the pump is placed below the motor
b) Upper pump type: the pump is placed above the motor; c) Crossflow type: the pump is placed in the motor rotor or the motor is placed in the pump wheel. : 3.2 Model representation method
JB/T 10377-2002
The model is composed of the following parts in principle,
a) Electric pump characteristic scale (nominal discharge port diameter); b) Electric system characteristic mark ZQ (QZ);
) Motor characteristic mark (S--water-filled motor, Y--oil-filled motor, no mark for type motor): l) Electric pump characteristic parameters (specific speed)
e) Other characteristic parameters of the electric pump (motor matching power). The following example is a recommended model representation method:
Other characteristics
1/10 of the nominal specific speed of the pump
Electric motor characteristics
Axial flow submersible electric pump
Nominal discharge port diameter, in mm
Example: The nominal discharge port diameter is 150mm, the nominal specific speed is 1000, and the electric pump equipped with a 4kW water-filled motor is represented as: 150ZQS-100-4 or 150QZ5-1004.
The nominal discharge port diameter is 700mm, the nominal specific speed is 700, and the electric pump equipped with a 160kW dry motor is represented as: 700ZQ-70-160 or 700QZ-70-160.
3.3 Basic parameters
The basic parameters are recommended to comply with the provisions of Appendix A. If the user has different requirements for the basic parameters of the electric pump from those in Appendix A, the order form or the provisions of Appendix E shall apply. Under the specified flow rate, the efficiency of the electric pump shall meet the value of the curve A under the corresponding flow rate in Figure A.2. 4 Technical requirements
4.1 Environmental conditions for the use of electric pumps
The electric pump shall be able to operate normally under the following environmental conditions: a) The medium to be transported is clean water or light sewage and other liquids with similar physical and chemical properties; b) The medium temperature does not exceed 40°C.
If the user has different requirements for the environmental conditions for the use of the electric system from the above requirements, the order form shall apply. 4.2 Performance of electric pumps
4.2.1 The performance parameters of the electric pump shall meet the requirements of 3.3. The tolerances of the flow plate, head and unit efficiency shall meet the requirements of Class C in GB/T3216-1989.
4.2.2 The manufacturer shall determine the allowable working range of the electric pump and draw a relationship line between the head, unit efficiency, motor input power and flow rate.
For electric pumps with semi-adjustable blades, performance curves (relationship curves between head, unit efficiency, motor input power and flow rate) for each installation angle of the blades should be provided (
4.2.3 The manufacturer should provide the minimum submersion depth of the center line of the electric pump impeller and provide the size of the water inlet flow channel according to user needs. 4.3 Motors
4.3.1 The protection level of the motor housing should be IPX8 as specified in GB4942.1-2001. 4.3.2 Rating of motors It is a continuous rating based on the continuous duty system (S1). 4.3.3 The rated frequency of the motor is 50Hz, and the rated voltage is 380V, 660V, 6kV, and 10kV. 4.3.4 In the range of 0.85 to 1.15 times the specified flow rate, when tested with normal temperature water, the motor input power should not exceed its input power limit.
When the rated output of the motor is less than or equal to 50kW, its input power limit is calculated according to formula (1): Pg,max=P[mo—0.15 ([— mot) ]2
When the rated output of the motor is greater than 50kW, its input power limit is calculated according to formula (2): Pg,max=P/[ mot—0.10 (1— mor) J--Where:
The input power limit of the motor, in kW:PThe rated output of the motor, in kw:
17mxWhen the output, voltage and frequency are rated, the guaranteed value of the motor efficiency, %. JB/T10377—2002
4.3.5During the operation of the electric pump, the deviation of the power supply voltage and frequency from the rated value and its influence on the motor performance and overflow limit shall comply with the provisions of GB755—2000F6.3.
4.3.6Electrical performance of the motor:
4.3.6.1When the output, voltage and frequency are rated, the guaranteed values ​​of efficiency and power factor shall not be lower than those specified in Table 1. 4.3.6.2 The guaranteed value of the ratio of the motor's stall torque to the rated torque at rated voltage is: not less than 1.0 when the rated output is less than or equal to 200kW, and not less than 0.7 when the rated output is greater than 200kW. 4.3.6.3 The guaranteed value of the ratio of the motor's maximum torque to the rated torque at rated voltage is not less than 1.8. 4.3.6.4 The guaranteed value of the ratio of the motor's stall current to the rated current at rated voltage is: not greater than 7.0 when the rated output is less than or equal to 200kW, and not greater than 6.5 when the rated output is greater than 200kW. The rated current is obtained by using the guaranteed values ​​of the rated output, rated voltage, efficiency and power factor.
4.3.6.5 The tolerance of the guaranteed value of the motor's electrical performance shall comply with the provisions of Table 2. 4.3.7 When the output, voltage and frequency of the electric pump are rated under the specified operating environment, the temperature rise limit of the motor stator winding (resistance method) shall not exceed the provisions of Table 3. If the temperature of the conveyed liquid is different from the provisions of 4.1b), the temperature rise limit shall be corrected according to the provisions of GB755-20007.10.
4.3.8 The cold insulation resistance of the motor stator winding to the housing shall not be less than 50M for dry motors; for water-filled motors, the stator winding shall be immersed in clean water at room temperature for 12 hours, and shall not be less than 150M0 for insulating materials such as ethylene and cross-linked polyethylene, and shall not be less than 40M for polyvinyl chloride; for oil-filled motors, it shall not be less than 100M. The insulation resistance in hot state (close to the working temperature) or after the temperature rise test shall not be lower than the value obtained by formula (3): R=U/ (1000+0.01P)
Where:
R-hot insulation resistance of the motor stator winding to the housing, in M: U-rated voltage of the motor, in V; p-rated output ratio of the motor, in kw. The hot insulation resistance of the motor shall not be lower than IM. (3)
4.3.9 When the three-phase power supply is balanced, the deviation of any phase of the blue phase no-load current of the motor from the blue phase average value shall not be greater than 10% of the blue phase average value
4.3.10 The stator winding of the motor shall be able to withstand a withstand voltage test of 2 times the rated voltage plus 1000V. The water-filled motor shall be immersed in clean water at room temperature for 12 hours before the test.
4.3.11 The stator winding of the motor shall be able to withstand the inter-turn impact withstand voltage test without being broken down. For the peak value of the test impulse voltage of 660V and below, it shall comply with the provisions of JB/T9615.2-2000. For 6kV and above, its withstand steep wavefront impulse voltage (peak value) shall comply with the provisions of Table 1 in JBT10098-2000.
4.3.12 The motor shall have a reliable overheat (or overcurrent) protection device. According to the provisions of the order form, the motor may be equipped with leakage protection, condensation protection, bearing temperature rise protection and other devices. 4.3.13 A separate grounding screw shall be provided in the motor junction box. The grounding screw and gasket shall be made of metal with good electrical conductivity that is not easy to corrode, and an obvious grounding mark shall be set near the grounding screw. This mark shall ensure that the motor is not easily erased during the entire service life. 4.3.14 The outlet terminal marking of the motor shall comply with the provisions of GB1971. When the order of the letters U, V, and w on the outlet terminal marking is the same as the direction of the phase sequence A, B, and C of the three-phase power supply voltage, the electric pump rotates counterclockwise when viewed from the water inlet end. If the user needs an electric pump that rotates in the clockwise direction, it should be negotiated separately. 3
JB/T10377—2002
4.3.15 The lead-out cable of the motor should be able to meet the requirements and comply with the provisions of the relevant cable standards. 4.3.16: When the pump is inspected at the factory, the no-load current and no-load consumption of the motor should be controlled within a certain value range, and this value range should ensure that the electrical performance of the motor meets the provisions of 4.3.6. 4.4 Structural design
4.4.1 Motor seal (except water-filled motor) 4.4.1.1 Sealing between the pump cavity and the inner cavity of the motor: A reliable sealing device should be set between the pump cavity and the inner cavity of the motor to prevent the liquid transported by the electric pump from entering the inner cavity of the motor. If the sealing device needs to add lubricating fluid (or barrier fluid), the type and quantity of the lubricating fluid (or barrier fluid) and the replacement cycle of the lubricating fluid (or barrier fluid) should be indicated in the product manual. 4.4.1.2 Each mating surface should have a reliable seal to prevent foreign impurities and media from entering the motor cavity. 4.4.1.3 After the electric pump is assembled, the sealing device between the pump cavity and the motor cavity and the motor cavity can withstand the allowable operating pressure of 1.5, but not less than 0.2MPa. During the pressure holding time, there shall be no leakage or other abnormal phenomena. 4.4.2 Critical speed www.bzxz.net
Under operating conditions, the actual first lateral critical speed of the pump as a whole shall meet the requirements of formula (4): nei1.4n.
The actual first lateral critical speed of the motor as a whole, in t/min; the rated speed of the motor, in rmin. 4.4.3 Balance
4.4.3.1 The rotating parts of the motor shall be subjected to static balance test, and the accuracy shall not be lower than the requirements of G6.3 in GB9239-1988. When the impeller is semi-adjustable or the blades and hub are welded together (non-integral cast impeller), its balance shall be in accordance with the following provisions: the allowable deviation of the weight of a single blade is 6% of the nominal weight of the blade, and the allowable weight deviation of each blade in each group of blades shall be in accordance with the provisions of Class C in Table 6 of B/T5413--1991. 4.4.3.2 The motor rotor shall be dynamically balanced and shall comply with the provisions of G6.3 in GB9239-1988: 4.4.4 Pressure-bearing parts
The parts of the electric pump that bear liquid pressure shall be able to withstand a water pressure test with a test pressure of 1.5 times the allowable working pressure of the pump, but not less than 0.2MPa. There shall be no leakage or other abnormal phenomena during the pressure holding time. Table 1 Guaranteed values ​​of motor efficiency and power factor Rated
n (%)
Synchronous speed rmin
428.63000
(%)
1 (continued)
JB/T10377-2002
Note: In Table 1, when calculating the motor efficiency, the motor loss includes the mechanical loss of the sealing device and the steel loss of the 5m lead-out cable. For oil-filled motors, the efficiency is reduced by 5% compared with the corresponding values ​​in the table, and the power factor is reduced by 1% compared with the corresponding values ​​in the table. For water-filled motors, the efficiency is reduced by 5% compared with the corresponding values ​​in the table, and the power factor is reduced by 2% compared with the corresponding values ​​in the table. Table 2 Tolerance items of guaranteed values ​​of motor electrical performance 4.4.5 Impeller Electrical performance name Rated output at or below positive W Rated output above 50 kW Power factor cos? Stalled-rotor torque Maximum torque Stalled-rotor current 0.15 (1) 0.10 (.1t) 1 (1-more) 6, minimum absolute value 0.02, maximum absolute value 0.07 Guaranteed value (% Guaranteed value -10% Guaranteed value +20% Temperature rise limit of motor stator winding Thermal classification or insulating material
polyvinyl chloride
polyethylene
cross-linked ethylene
The impeller blades can be designed as fixed or semi-adjustable. 4.4.5.1
Temperature rise limit
4.4.5.2 The impeller shall be securely fixed on the shaft to prevent circumferential or axial movement during rotation. K
4.4.5.3 The semi-adjustable blades and the blades and hub combined welded impeller blades shall comply with the provisions of JB/T5413-19915
JB/T10377-2002
4.4.6 Clearance
4.4.6.1 The clearance between the outer circle of the impeller and the shell shall be even, and the maximum clearance in the diameter direction shall be 1.5/1000 of the impeller diameter.4.4.7 Shaft and sleeve
4.4.7.1 The shaft should have sufficient strength and rigidity. The thread direction on the shaft should keep the nut in a tight state when the shaft rotates in the specified direction. 4.4.7.2 If a sleeve is installed, the sleeve should be reliably fixed on the shaft and prevent the leakage of liquid between the shaft and the sleeve. 4.4.8 Lifting
The electric pump should be equipped with a lifting device.
4.5 Materials of main parts
The materials of the main parts of the electric pump should be compatible with the medium being transported, and the chemical composition and mechanical properties of the materials should comply with the relevant material standards. If required by the user, the chemical composition, mechanical properties and non-destructive testing report of the material can be provided. 4.6 Manufacturing
4.6.1 Plated parts
4.6.1.1 Castings should comply with the provisions of JB6880.1 and JB6880.2. 4.6.1.2 The dimensional deviation of the flow-through part of the casting shall comply with the provisions of Table 5 in GB13008-1991. 4.6.2 Machining
4.6.2.1 The pitch deviation of the installation holes of each blade of the impeller seat: the deviation shall not exceed ±0.3% of the nominal pitch. 4.6.2.2 The deviation of the axis of the blade installation hole on the same plane: the deviation shall not exceed ±0.1% of the nominal radius. 4.6.2.3 The zero-degree line of the blade and the angle line on the impeller seat shall be clearly marked. 4.6.2.4 When the blade is installed on the impeller, the installation angle deviation shall not exceed ±15°, and the circular runout of the impeller outer circle shall be checked. Its accuracy shall comply with the provisions of Grade 9 in GB/T1184-1996.
4.6.3 Assembly
4.6.3.1 All parts shall be inspected and qualified before assembly. 4.6.3.2 The electric pump with a discharge port diameter of less than 500mm should be shipped as a whole unit. If it cannot be shipped as a whole unit due to restrictions on lifting and transportation conditions, it should be pre-assembled in the factory. After pre-assembly, the relevant parts should be marked. 4.6.3.3 After the electric pump is assembled, the rotating rotor should be stable and adjusted without blocking and stagnation. 4.6.4 Anti-rust and painting
4.6.4.1 Molybdenum disulfide lubricant should be applied to the mating parts that are easy to bite. 4.6.4.2 Anti-rust oil should be applied to the exposed processed surface after assembly. 4.6.4.3 The painting of the electric pump should be in accordance with the provisions of JB/T4297. 4.6.4.4 After the test is completed, the accumulated water in the electric pump should be removed and the anti-rust treatment should be re-performed. 5 Test methods
5.1 The chemical composition analysis method and mechanical property test method of the material should comply with the provisions of the relevant material standards. 5.2 The water pressure test uses clean water at room temperature and the pressure holding time is not less than 5 minutes. 5.3 The air pressure test uses dry air or nitrogen and the pressure holding time is not less than 5 minutes. 5.4 The type inspection and factory inspection methods of electric pumps should be in accordance with the relevant provisions of GB/T3216-1989 and GB/T12785-2002. The length of the cable during the test is 5m. The impulse voltage withstand test between the stator windings of the motor shall be carried out in accordance with the provisions of JB/T9615.1-2000 for 660V and below, and in accordance with the provisions of JB/T10098-2000 for 6kV and above: 6 Inspection rules
Electric pumps shall be subject to type inspection or factory inspection
6.1 Type inspection
6.1.1 Type inspection shall be carried out in case of any of the following situations6
Trial and final product identification for new products or old products transferred to the factory for production: a
After formal production, if there are major changes in structure, materials, and processes that may affect product performance: c
Periodic inspection of mass-produced products, once a year: d) When the product is discontinued for a long time and then resumed: e)
When the inspection results are significantly different from those of the last type inspection. The inspection items include:
a) Assembly quality:
JB/T10377-2002
The sealing device between the motor cavity and the pump cavity and the air pressure test of the motor cavity (except for water-filled motors); c) Insulation resistance measurement (including the cold insulation resistance and hot insulation resistance of the stator winding to the casing); d) Determination of the cold DC resistance of the motor winding; e) No-load test of the motor (including the measurement of no-load current, no-load loss and no-load characteristic curve); f) Temperature rise test of the motor:
When necessary Load test of the motor (including the determination of the motor working characteristic curve): h)
Performance test of the electric pump (including the determination of the head and unit efficiency at the specified flow rate, the determination of the motor input power within the range of 0.85-~1.15 times the specified flow rate, the determination of the flow head, flow-unit efficiency, and flow-motor input power curve) 3" Motor stall test [including the determination of stall current, stall loss and stall sustainability curve): j)
Determination of the maximum torque of the motor:
k) Withstand voltage test of the motor (including the withstand voltage test between the winding and the casing and the inter-turn insulation impulse voltage test). 6.1.3 The number of units inspected is usually not less than 2. 6.2 Factory inspection
6.2.1 Products produced in batches should be inspected at the factory. 6.2.2 Each electric pump shall be subject to type inspection b), c), d), e), k) and bundle inspection a), h) during factory inspection. The number of units to be inspected and the inspection rules shall comply with the provisions of B/T8687. The sampling plan may adopt one-time sampling or two-time sampling. The general inspection level is I, and the qualified quality level AQL is 4.D.
When the manufacturer cannot conduct type inspection and factory inspection due to equipment conditions, model test or on-site test may be adopted. If model test is adopted, the impeller diameter of the model pump shall not be less than 300mm. 7 Warranty period
When the user complies with the provisions of this standard and installs and uses the product in accordance with the requirements of the product manual, within 12 months from the date of installation and use (or within 18 months from the date of delivery), if the electric pump is damaged or cannot work normally due to poor manufacturing quality, the manufacturer shall be responsible for repairing or replacing parts (excluding wearing parts) or the entire electric pump for the user free of charge. 8. Marking, packaging, transportation and storage
8.1 Labeling
8.1.1 Firmly nail a label on the obvious part of the electric pump. The size and technical requirements of the label shall comply with the provisions of GBT13306. The label material and the printing method of the label shall ensure that the writing is not easily erased or rusted during the service life of the electric pump. The following contents shall be indicated on the label: a) Manufacturer name
b) Product name and model:
Main technical parameters of the motor: rated output (kW), rated frequency (Hz), rated voltage (V), rated current (A), rated speed (rmin), number of phases, thermal classification (or temperature rise limit): Only cold insulation resistance is tested during delivery inspection. 2)
During factory inspection, the no-load current and no-load consumption are tested by the instrument. During factory inspection, the head and unit efficiency at the specified flow rate, and the motor input power within the specified flow range of 0.85 to 1.15 times are tested. 3)
JB/T10377—2002
d) Main parameters of the electric pump: flow (mh), head (m): e) Product weight (kg):
f) Product factory number and date of manufacture.
8.1.2 The direction of rotation shall be indicated by a chain arrow or a turn sign at a conspicuous position of the electric pump. The arrow shall be red. 8.1.3 Safety precautions shall be fixed below the sign. The marking period may involve requirements that endanger personal and equipment safety. 8.1.4 The motor winding has six or three outlet terminals. The outlet terminals shall have obvious markings, and the markings shall be ensured to be indelible during the entire service life of the motor. The markings shall be in accordance with the provisions of Table 4. Table 4 Marking of the outlet terminals of motor windings
Name of stator winding group
First phase
Second phase
Third phase
Six outlet terminals
Three outlet terminals
8.1.5 The signal cable of the electric pump shall have corresponding serial number markings, and the meaning of the markings shall be in accordance with the provisions of the approved product drawings and technical documents. 8.2 Packaging
The packaging shall be in accordance with the provisions of GB/T13384 and GB/T191--2000. Each electric pump shall be accompanied by the following documents when leaving the factory and sealed in a waterproof bag a) Product instruction manual:
b) Packing list;
c) Product certificate.
8.3 Transportation
During transportation, it shall be ensured that the equipment, parts and documents shall not be damaged or lost. 8.4 Storage
The electric pump and its accessories should be protected from rust or damage during the storage period. The validity period of the oil seal is 12 months. 9 Complete set scope
The user can order all or part of the following complete set supply scope according to the needs, and indicate it in the order form: a) Electric pump:
b) Control cabinet:
Mite box:
Accessories (parallel cylinder, flap door, embedded parts, etc.): e>
Spare parts:
Special tools.
Appendix A
(Normative Appendix)
Basic parameters of small and medium-sized axial flow submersible electric pumps
The values ​​in Table A, 1 are the performance parameters of the electric pump conveyor belt source clear water resistance specified point. A.1
JB/T10377—2002
A.2 Table AI only gives the rated output of the motor when the blade installation angle is 0". When the blade is semi-adjusted, the rated output of the motor at each blade installation angle shall comply with the provisions of 4.3.4. The curve in Figure A.1 is the working range of the electric pump, A.3
The curve in Figure A.2 is the pump efficiency curve, Table A.1
Basic parameters of small and medium-sized axial flow submersible electric pumps
Synchronous speed
Motor output
Electrical system (unit)
Efficiency%
Nominal specific speed
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