Some standard content:
JB/T8857--2000
This standard is a revision of JB/T8857-1999 (ZBJ71.017--1989) "Types and basic parameters of centrifugal sewage submersible electric pumps" and JB
5803--1991 "Technical conditions for sewage and sewage submersible electric pumps". Compared with JB/T8857--1999 and JB5803--1991, the main technical differences of this standard are as follows: - The basic parameters of the product have been greatly adjusted, the performance range and the rated power range of the motor have been expanded to meet market demand, and products that meet actual use requirements are allowed to be developed according to the provisions of the standard; the product model representation method has been changed; - The application field of the product has been broadened, and the restrictions on the pH value of the pumped liquid and the depth of the submersible liquid have been cancelled; - The technical conditions of the product have been appropriately adjusted, and the content of structural design and other aspects has been added, and the technical requirements for single-phase motors have been cancelled. , removed some unnecessary or impossible to assess technical requirements (such as motor vibration, noise, minimum torque and other provisions); centrifugal submersible sewage pump is a coaxial pump and motor composed of the whole, so this standard stipulates the unit efficiency assessment (instead of the pump efficiency assessment in the original standard) and the motor input power measurement (instead of the shaft power measurement in the original standard); this standard lists the pump efficiency provisions in Appendix A (standard appendix) and adopts a new pump efficiency curve; the basic parameters and performance range of the pump are listed in Appendix C (suggestive appendix); added a centrifugal submersible sewage pump data sheet [Appendix B (standard appendix). This standard replaces JB/T8857-1999 and JB5803-1991 from the date of implementation. Appendix A and Appendix B of this standard are both standard appendices. Appendix C of this standard is a suggestive appendix. This standard is proposed and managed by the National Pump Standardization Technical Committee. Drafting units of this standard: Shenyang Pump Research Institute, Shijiazhuang Impurity Pump Research Institute, Jiangsu Asia-Pacific Pump Industry Group Co., Ltd., Nanjing Lanshen Pump Group Co., Ltd., Dalian Acid Resistant Pump Factory. The main drafters of this standard are Wei Guoqun, Chang Qingchang, Zhou Qingming, Shi Xianping and Zhang Xiaofeng. 734
1 Scopewww.bzxz.net
Machinery Industry Standard of the People's Republic of China
Centrifugal submersible sewage pumps
Centrifugal submersible sewage pumpsJB/T 8857—2000
Replaces JB/T 8857—1999
JB 5803—1991
This standard specifies the type and basic parameters, technical requirements, test methods and inspection rules of centrifugal submersible sewage pumps (hereinafter referred to as pumps). This standard is applicable to pumps that convey liquids containing non-abrasive solid particles, fibers, and impurities (such as urban domestic sewage, chemical industrial wastewater, etc.).
2 Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191—1990 Pictorial markings for packaging, storage and transportation
GB/T755—1987 Basic technical requirements for rotating electrical machines GB/T985-1988 Basic forms and dimensions of weld grooves for gas welding, manual arc welding and gas shielded welding GB/T986—1988 Basic forms and dimensions of weld grooves for submerged arc welding GB1971-—1980 Markings and rotation direction of motor line ends GB/T3216—1989 Test methods for centrifugal pumps, mixed flow pumps, axial flow pumps and vortex pumps GB/T 4942.1—1985
Degree of protection of motor housing
3 Determination of allowable imbalance for balancing quality of rigid rotors GB/T 9239---1988
GB/T 12785--1991
GB/T13306—1991
GB/T13384-—1992
JB/T 4297--1992
JB/T6879—1993
Test methods for submersible electric pumps
General technical conditions for packaging of electromechanical products
Technical conditions for painting of pump products
Dimensional tolerances of flow-through parts of centrifugal pump castings
JB/T 6880. 1-1993
Gray iron castings for pumps
JB/T 6880.21993
Steel castings for pumps
JB/T 8687---1998
3 Sampling inspection of pump products
3 Type and basic parameters
3.1 Type
3.1.1 The pump is single-stage, single-suction, vertical, and can work submerged in liquid for a long time. The pump and the motor are coaxial, and the motor is a three-phase asynchronous motor. 3.1.2 According to the discharge method of the liquid transported by the pump, it is divided into three basic types: a) External type: The liquid is discharged directly from the discharge pipe connected to the pump body, as shown in Figure 1; b) Internal type: The liquid is discharged from the annular flow channel between the unit casing and the motor casing, as shown in Figure 2; c) Semi-internal type: The liquid is discharged from the pipe connected to the motor casing, as shown in Figure 3. Approved by the State Bureau of Machinery Industry on March 30, 2000 and implemented on October 1, 2000
Liquid suction
Motor part
Liquid discharge
External type
Discharge pipe part
JB/T 8857—2000
Annular flow channel
Liquid suction
Internal type
Motor part
Liquid discharge
Note: Figures 1, 2 and 3 are all schematic diagrams, which only express the discharge method of the liquid transported by the pump. 3.2 Model representation method
Rated power of motor, W
Lift at specified point, m
Flow at specified point, m/h
Centrifugal submersible sewage pump
-Discharge outlet diameter, mm
Example:
Liquid in
Motor part
Liquid out
Figure 3 Semi-built-in
A centrifugal submersible sewage pump with a discharge outlet diameter of 200mm, a specified point flow of 400m/h, a specified point lift of 20m, and a motor rated power of 45kW is represented as:
200QW400-20-45
3.3 Direction of rotation
From the motor end of the pump, the impeller rotates clockwise. 3.4 Basic parameters
Basic parameters are recommended according to Appendix C (Prompt Appendix). If the user has requirements for the basic parameters of the pump that are different from those in Appendix C, the order form or data sheet [Appendix B (subject appendix) shall be followed. 4 Technical requirements
4.1 Environmental conditions for the use of the pump
JB/T 8857—2000
The pump should be able to operate normally under the following environmental conditions: a) The altitude is generally not more than 1000m;
b) The temperature of the medium being transported is generally not more than 40℃; c) The volume ratio of the solid particle content in the medium is not more than 4%; d) The maximum particle size of the solid particles in the medium complies with the provisions of the product manual, but is not greater than 50% of the discharge port diameter. If the user has requirements for the environmental conditions for the use of the pump that are different from the above requirements, the order form shall be followed. 4.2 Pump performance
4.2.1 The pump performance parameters shall comply with the provisions of 3.4. In normal temperature clean water, when the pump flow rate is the specified value, the unit efficiency shall comply with the provisions of Appendix C.
4.2.2 The tolerance of flow rate, head and unit efficiency shall comply with the provisions of Class C in GB/T3216-1989. 4.2.3 The manufacturer shall determine the allowable operating range of the pump and draw the relationship curve between head, unit efficiency, motor input power and flow rate.
4.3 Motor
4.3.1 The protection level of the motor housing shall comply with the provisions of IPX8 in GB/T4942.11985. 4.3.2 The motor rating is a continuous rating based on the continuous working system (S1). 4.3.3 When the pump is running under normal working conditions, within the range of 0.7~1.2 times the specified flow rate, the motor input power shall not exceed its input power limit; when tested with normal temperature clean water, the motor input power shall not exceed its input power limit. When the rated power of the motor is less than or equal to 45kW, its input power limit is calculated according to formula (1): Pgr.max = P/Lnmot - 0.15(1 - 7mot)/(2 2)] When the rated power of the motor is greater than 45kW, its input power limit is calculated according to formula (2): Pgr.max = P/Lnmot - 0.10(1 - nmot)/(2 2)) Where: Pgr.max —
—the input power limit of the motor, kW; P—the rated power of the motor, kW;
7mot—the guaranteed value of the motor efficiency when the power, voltage and frequency are at the rated values, %. · (1)
4.3.4 During the operation of the pump, the deviation of the power supply voltage and frequency from the rated values and their influence on the motor performance and temperature rise limit shall comply with the provisions of GB/T755.
4.3.5 Electrical performance of the motor
4.3.5.1 When the power, voltage and frequency are at the rated values, the guaranteed values of efficiency and power factor shall not be lower than those specified in Table 1. 4.3.5.2 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 power is less than or equal to 200kW; not less than 0.7 when the rated power is greater than 200kW. 4.3.5.3 The guaranteed value of the ratio of the motor's maximum torque to the rated torque at rated voltage is not less than 1.5. 4.3.5.4 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 power is less than or equal to 200kW; not greater than 6.5 when the rated power is greater than 200kW. The rated current is obtained by using the guaranteed values of the rated power, rated voltage, efficiency and power factor.
4.3.5.5 The tolerance of the guaranteed value of the motor's electrical performance shall comply with the provisions of Table 2. 737
JB/T 8857—2000
Table 1 Guaranteed values of motor efficiency and power factorSynchronous speed, r/min
Efficiency nmor, %
Power factor cosp
Note: When calculating the motor efficiency in the table, the motor loss includes the steel loss of the 5m lead-out cable, but does not include the mechanical seal loss; the stray loss is calculated as 0.5% of the input power.
JB/T8857—2000
Table 2 Tolerance of guaranteed values of electrical performance of motors Electrical performance name
Efficiency mmot
Rated power 45kW and below
Rated power above 45kW
Power factor cosp
Locked-rotor torque
Maximum torque
Locked-rotor current
—0. 15(1-mot)
- 0. 10(1— mot)
(1cosp)/6, minimum—0. 02
15% of guaranteed value
10% of guaranteed value
+20% of guaranteed value
4.3.6 When the pump is in the specified operating environment, and the power, voltage and frequency are at the rated values, the temperature rise limit of the motor stator winding (resistance method) shall comply with the provisions of Table 3.
Table 3 Temperature rise limit of motor stator winding
Insulation grade
Temperature rise limit
If the altitude of the test site or the temperature of the conveying medium is different from the provisions of 4.1a) and 4.1b), the temperature rise limit shall be corrected according to the provisions of GB/T755.
4.3.7 The cold insulation resistance of the motor stator winding to the housing shall not be less than 50M2, and the hot insulation resistance (close to the operating temperature) or after the temperature rise test shall not be less than the value obtained by formula (3): R = U/(1 000 + 0. 01 P)
Where: R---—hot insulation resistance of the motor stator winding to the housing, MQ; U-rated voltage of the motor, V;
-rated power of the motor, kW.
However, the hot insulation resistance of the motor shall not be less than 1MQ. (3)
4.3.8 When the three-phase power supply is balanced, the deviation of any phase of the three-phase no-load current of the motor from the three-phase average value shall not be greater than 10% of the three-phase average value.
4.3.9 The motor stator winding shall be able to withstand a withstand voltage test of 2 times the rated voltage plus 1000V. 4.3.10 The motor should have a reliable overheat (or overcurrent) protection device. According to the provisions of the order form, the motor can be equipped with leakage protection, degree protection, bearing temperature rise protection and other devices. 4.3.11 The motor should have a reliable grounding device. There should be an obvious grounding mark on the grounding wire of the lead-out cable. The motor line end mark and rotation direction should comply with the provisions of GB1971, and it should be ensured that the mark is not easily erased during the service life of the pump. 4.3.12 The lead-out cable of the motor should be able to ensure the use requirements and comply with the provisions of relevant cable standards. 4.3.13 When the pump is inspected at the factory, the no-load current and no-load loss 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 4.3.5. 4.4 Structural design
4.4.1 Motor cooling
4.4.1.1 The cooling medium of the motor can be the liquid transported by the pump or other cooling medium. 4.4.1.2 If the cooling medium is the liquid delivered by the pump and an external pipeline is required, the pipeline system (including all accessories) shall be supplied by the pump manufacturer and shall be fully installed on the pump. The pipeline system shall be designed and configured so that it can be removed for cleaning and maintenance. The pipeline material shall be resistant to corrosion caused by the delivered liquid and environmental conditions.
4.4.2 Motor seal
4.4.2.1 Seal between the pump cavity and the inner cavity of the motor A reliable sealing device shall be provided between the pump cavity and the inner cavity of the motor to prevent the liquid delivered by the pump from entering the inner cavity of the motor. 739
JB/T 8857--2000
If the sealing device needs to be added with 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) shall be indicated in the product manual. 4.4.2.2 Each mating surface shall have a reliable seal to prevent foreign impurities and media from entering the inner cavity of the motor. 4.4.2.3 After the pump is assembled, the sealing device on the motor side and the inner cavity of the motor shall be able to withstand a test pressure of 1.5 times the liquid pressure at the submersible depth of the pump, but not less than 0.2MPa. During the pressure holding time, there shall be no leakage or other abnormal phenomena. 4.4.2.4 After the pump is assembled, the sealing device on the pump side shall be able to withstand a test pressure of 1.5 times the allowable working pressure of the pump, but not less than 0.2MPa. During the pressure holding time, there shall be no leakage or other abnormal phenomena. 4.4.3 Critical speed
Under operating conditions, the actual first lateral critical speed of the pump's integral rotor shall be at least 10% higher than the rated speed of the motor. 4.4.4 Balance
4.4.4.1 The impeller shall be subjected to static balance test. The unbalanced moment allowed by static balance shall be calculated according to formula (4): M eG
Wherein: M is the unbalanced moment allowed, N·m; e is the permissible eccentric moment, which shall be obtained according to G6.3 grade in GB/T9239-1988, m; G is the weight of the impeller, N.
When the calculated unbalanced moment allowed by the impeller is less than 0.03RN·m, it shall be 0.03RN·m. Wherein R is the radius of the impeller without weight (m).
4.4.4.2 The impellers in the following cases shall be subjected to dynamic balance: a) non-axisymmetric impellers;
b) impellers with pump speed greater than 1800r/min and flow greater than 55m/h and impeller diameter greater than 150mm. At both ends of the impeller, the unbalanced moment allowed for dynamic balancing is calculated according to formula (5): M = 0.5eG
The meaning of the symbols in the formula is the same as in 4.4.4.1. When the calculated dynamic balancing moment is less than 0.015RN·m, it is calculated as 0.015RN·m. Where R is the radius of the impeller deweighted part (m).
4.4.4.3 The motor rotor shall be dynamically balanced and shall comply with the provisions of G6.3 in GB/T9239-1988. 4.4.5 Pressure-bearing parts
The parts and components in the pump that bear the working 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. During the pressure holding time, there shall be no leakage or other abnormal phenomena. 4.4.6 Impeller
4.4.6.1 The impeller adopts closed, semi-open or open structure, and can be designed as single-channel or multi-channel according to the purpose. 4.4.6.2 When the medium transported by the pump meets the requirements of 4.1c) and 4.1d), the structure of the impeller should ensure that solid particles will not be blocked. 4.4.6.3 The impeller should be reliably fixed on the shaft to prevent circumferential or axial movement during rotation. 4.4.7 Sealing ring
If a sealing ring is installed, it should be firmly locked after assembly and will not rotate. The installed sealing ring should be replaceable. 4.4.8 Shaft and sleeve
4.4.8.1 The shaft should have sufficient strength and rigidity. The thread direction on the shaft should keep the nut in a tightened state when the shaft rotates in the specified direction.
4.4.8.2 If a shaft sleeve is installed, it should be securely fixed on the shaft and prevent leakage of liquid between the shaft and the shaft sleeve. 4.4.9 Lifting
The pump and its heavier parts and components should be equipped with a lifting device. 4.5 Materials
4.5.1 The materials of the main parts and components of the 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 740
standards.
JB/T 8857-2000
4.5.2 Castings
Castings should comply with the provisions of JB/T6880.1 and JB/T6880.2, and the dimensional deviation of the flow-through parts should comply with the provisions of JB/T6879. 4.5.3 Weldings
The form and size of the weld groove of carbon steel and low alloy steel parts and components should comply with the provisions of GB/T985 and GB/T986, and the welds should not have defects such as incomplete penetration, pores, cracks, burn-through and slag inclusions that reduce the performance. 4.6 Assembly
4.6.1 All parts and components shall be inspected and qualified before assembly. 4.6.2 After the pump is assembled, the rotating rotor shall be stable and adjusted, without jamming or stagnation. 4.7 Anti-rust and painting
4.7.1 Molybdenum disulfide lubricant shall be applied to the mating parts that are easy to bite. 4.7.2 Anti-rust oil shall be applied to the exposed processed surfaces after assembly. 4.7.3 The painting of the pump shall comply with the provisions of JB/T4297. 4.7.4 After the test is completed, the accumulated water in the pump shall be removed and the anti-rust treatment shall be performed again. 5 Test methods
5.1 The chemical composition analysis method and mechanical property test method of the material shall comply with the provisions of the relevant material standards. 5.2 The water pressure test shall use clean water at room temperature, and the pressure holding time shall not be less than 5 minutes. 5.3 The air pressure test shall use dry air or nitrogen, and the pressure holding time shall not be less than 5 minutes. 5.4 Determination of the maximum solid particle size allowed to pass through the test using one of the following two methods a) Check the minimum size of the pump flow zero and component flow section, which should be larger than the maximum solid particle size that can be passed through, and dismantle the whole machine for inspection;
b) The pump is operated in a certain volume of clean water at room temperature, and simulated balls of corresponding particle diameter are added for testing. 5.5 In addition to complying with the provisions of 5.3 and 5.4, the other test items in 6.1.2 shall comply with the provisions of GB/T3216 and GB/T12785. The length of the cable during the test is 5m. 6 Inspection rules
The pump should be subjected to type inspection or factory inspection.
6.1 Type inspection
6.1.1 Type inspection is conducted in any of the following cases: a) Trial design and identification of new products or old products transferred to the factory for production; b) 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 stopped for a long time and then resumed; e) When the factory inspection results are significantly different from the last type inspection. 6.1.2 Inspection items include:
a) Assembly quality:
b) Air pressure test of the inner cavity of the motor and the sealing device on the motor side, and the sealing device on the pump side; c) Test for the maximum solid particle size allowed to pass; d) Determination of insulation resistance (including the cold insulation resistance and hot insulation resistance of the stator winding to the housing). Note: Only the cold insulation resistance is tested during factory inspection. e) Determination of cold DC resistance of motor windings; f) No-load test of motor (including determination of no-load current, no-load loss and no-load characteristic curve); 741
Note: Only no-load current and no-load loss are tested during factory inspection. g) Temperature rise test of motor;
JB/T 8857--2000
h) Load test of motor when necessary (including determination of motor working characteristic curve); i) Performance test of pump (including determination of head and unit efficiency at specified flow rate, determination of motor input power within the range of 0.7~～1.2 times specified flow rate, determination of flow-head, flow-unit efficiency and flow-motor input power curve); Note: Only head and unit efficiency at specified flow rate and motor input power within the range of 0.7～1.2 times specified flow rate are tested during factory inspection. j) Motor stall test (including stall current, stall loss and stall characteristic curve determination); k) Determination of motor maximum torque;
1) Motor withstand voltage test (including winding to machine withstand voltage test and inter-turn insulation withstand impulse voltage test). 6.1.3 The number of units to be inspected shall not be less than 2.
6.2 Factory inspection
6.2.1 Products produced in batches shall be subject to factory inspection. 6.2.2 During factory inspection, each pump shall be subject to type inspection b), d), e), f), 1); a), i) random inspection. The number of units to be inspected and the inspection rules shall comply with the provisions of JB/T8687. The sampling plan may adopt single sampling or double sampling. The general inspection level is 1, and the qualified quality level AQL is 4.0.
6.3 Final Inspection
The quality inspection department of the manufacturer shall check the integrity and correctness of the scope of supply according to the provisions of the order form and packing list, including the inspection of product painting, appearance quality and packaging. After passing the inspection, a product certificate will be issued, and then the product will be packed and shipped. 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 instruction manual, within 12 months from the date of installation and use (or within 18 months from the date of delivery), if the 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 pump for the user free of charge. 8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 Firmly nail the pump label on the obvious part of the pump. The size and technical requirements of the label shall comply with the provisions of GB/T13306. The label material and printing method of the label shall ensure that the handwriting is not easy to be erased or rusted during the entire service life of the pump. The following information should be indicated on the label: a) Manufacturer name;
b) Product name and model;
c) Main technical parameters of the motor: rated power (kW), rated frequency (Hz), rated voltage (V), rated current (A), rated speed (r/min), number of phases, insulation grade (or temperature rise limit); d) Main parameters of the pump: flow rate (m/h), head (m), e) Product weight (kg);
f) Product factory number and date of manufacture.
8.1.2 The direction of rotation should be indicated by a cast arrow or a turn plate at a conspicuous part of the pump, and the arrow should be red. 8.2 Packaging
The packaging should comply with the provisions of GB/T13384 and GB191. Each pump should be accompanied by the following documents when it leaves the factory and sealed in a waterproof bag: a) Assembly drawing:
b) Installation drawing,
c) Product instruction manual;
d) Packing list;
e) Product certificate.
8.3 Transportation
JB/T8857—2000
During transportation, it should be ensured that the equipment, parts, components and documents shall not be damaged or lost. 8.4 Storage
During storage, the pump and its accessories should be protected from rust or damage. The validity period of the oil seal is 12 months. 9 Complete set scope
Users can order all or part of the following complete set supply scope according to their needs and indicate it in the order form: a) Pump;
b) Control cabinet;
c) Terminal box;
d) Accessories (guide rails, brackets, hanging chains, discharge elbows, pipeline components, etc.); e) Spare parts;
f) Special tools.
A1 Pump efficiency of centrifugal submersible sewage pump
JB/T 8857—2000
Appendix A
(Standard Appendix)
Pump efficiency and unit efficiency of centrifugal submersible sewage pump In normal temperature clean water, when the pump flow rate is the specified value, the pump efficiency should not be lower than the value of the curve in Figure A1. Curve A is a closed impeller, curve B is a semi-open or open impeller, and curve C is a single-channel impeller. When the pump has a specific speed of n. <100 or ns>210, the pump efficiency shall be corrected according to Figure A2.
When the pump is equipped with auxiliary mechanisms (such as pump inlet cutter, stirring wheel), the pump efficiency is allowed to be 4% lower than the value of the curve in Figure A1 (or the corrected value).
A2 Unit efficiency of centrifugal submersible sewage pump
In normal temperature clean water, when the pump flow rate is the specified value, the unit efficiency shall not be lower than the value obtained by formula (A1): Ig =- n(nmot - 2%)
Where: g—
Unit efficiency, %;
n—Pump efficiency, determined according to A1, %;
7mot————Efficiency of the motor, obtained according to Table 1, %. A3 Example
.(Al )
Specified point flow Q==400m/h, head H=50m, speed n=1450r/min, closed impeller centrifugal submersible sewage pump, the value obtained by curve A in Figure A1 is 66.5%; the pump specific speed n is 93, less than 100,The value found in Figure A2 is 1%. 66.5%-1%=65.5%
The pump efficiency n of the pump should not be less than 65.5%. The rated power of the motor is 110kW. According to Table 1, the motor efficiency nmg=90.5%. According to formula (A1): ng=65.5%(90.5%-2%)=58.9%
The unit efficiency of the pump should not be less than 58.9%. 744
JB/T 8857-2000
00209000
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