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GB/T 24674-2021 English PDF (GBT24674-2021)

GB/T 24674-2021 English PDF (GBT24674-2021)

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GB/T 24674-2021: Waste submersible motor-pumps

This Standard specifies the types, models, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, storage and transportation of waste submersible motor-pumps. This Standard is applicable to single-phase or three-phase waste submersible motor pumps conveying various types of sewage (waste water) or mixed liquids containing insoluble solid phases, such as: silt, fiber, excrement and sludge manure, etc.
GB/T 24674-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 65.060.35
CCS B 91
Replacing GB/T 24674-2009
Waste Submersible Motor-pumps
ISSUED ON: APRIL 30, 2021
IMPLEMENTED ON: NOVEMBER 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 7
4 Types, Models and Basic Parameters ... 7
5 Technical Requirements ... 20
6 Test Methods ... 30
7 Inspection Rules ... 32
8 Marking, Packaging, Storage and Transportation ... 34
Appendix A (Normative) Determination of Efficiency of Motor-pumps ... 37 Waste Submersible Motor-pumps
1 Scope
This Standard specifies the types, models, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, storage and transportation of waste submersible motor-pumps.
This Standard is applicable to single-phase or three-phase waste submersible motor- pumps conveying various types of sewage (waste water) or mixed liquids containing insoluble solid phases, such as: silt, fiber, excrement and sludge manure, etc. (hereinafter referred to as ?€?motor-pumps?€?).
2 Normative References
The contents of the following documents constitute indispensable clauses of this document through normative references in the text. In terms of references with a specific date, only versions with a specified date are applicable to this document. In terms of references without a specific date, the latest version (including all the modifications) is applicable to this document.
GB/T 191 Packaging - Pictorial Marking for Handling of Goods
GB/T 755 Rotating Electrical Machines - Rating and Performance
GB/T 1176 Casting Copper and Copper Alloys
GB/T 1220 Stainless Steel Bars
GB/T 1348 Spheroidal Graphite Iron Castings
GB/T 1971 Rotating Electrical Machines - Terminal Markings and Direction of Rotation GB/T 2828.1-2012 Sampling Procedures for Inspection by Attribute - Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection GB/T 3098.6 Mechanical Properties of Fasteners - Stainless Steel Bolts, Screws and Studs
GB/T 4942.1-2006 Degrees of Protection Provided by the Integral Design of Rotating Electrical Machined (IP Code) - Classification
GB/T 5013.4 Rubber Insulated Cables of Rated Voltages up to and Including 450/750 V - Part 4: Cords and Flexible Cables
GB/T 9239.1-2006 Mechanical Vibration - Balance Quality Requirements for Rotors in a Constant (rigid) State - Part 1: Specification and Verification of Balance Tolerances GB/T 9439 Grey Iron Castings
GB 10395.8 Tractors and Machinery for Agriculture and Forestry - Technical Means for Ensuring Safety - Part 8: Irrigation Pumps and Machines
GB 10396 Tractors, Machinery for Agriculture and Forestry, Powered Lawn and Garden Equipment - Safety Signs and Hazard Pictorials - General Principles GB/T 12785-2014 Test Methods for Submersible Motor-pumps
GB/T 13306 Plate
GB/T 17241.6 Integral Cast Iron Flanges
GB/T 20878 Stainless and Heat-resisting Steels - Designation and Chemical Composition
GB/T 22715 Impulse Voltage Withstand Levels of Form-wound Stator Coils for Rotating a. c. Machines
JB/T 5673 Agriculture and Forestry Tractors and Machinery - General Requirements of Painting
JB/T 6880.1 Grey Iron Castings for Pumps
JB/T 6880.2 Steel Castings for Pumps
JB/T 6880.3 Castings for Pumps - Part 3: Erosive Wear-resistant White Iron Castings of Pumps
JB/T 8735.2 Rubber Insulated Cords and Flexible Cables of Rated Voltages up to and Including 450/750 V - Part 2: Tough Rubber Sheathed Flexible Cables for General Purposes
JB/T 8735.3 Rubber Insulated Cords and Flexible Cables of Rated Voltages up to and Including 450/750 V - Part 3: Rubber Insulated Braided Cords
JB/T 8996-2014 Guide to the Selection of High-voltage Cables
JB/T 11923 Submersible Motor-pumps - Reliability Evaluation Methods
JB/T 12728-2016 Specification and the Energy Efficiency Grades for Y, YX Series Three-phase High Voltage Induction Motors (Frame size 355 ~ 630)
Example 5: specified flow: 50 m3/h, specified lift: 15 m, rated power: 7.5 kW, matching three- phase motor, voltage: 380 V, closed-type stainless steel waste submersible motor-pump, is marked as:
WQ50-15-7.5G
4.2.2 Supplementary marking refers to the necessary description or indication of the product made by the enterprise in accordance with the contract or the stipulations. It is marked or not marked as needed.
4.3 Basic Parameters
4.3.1 When the power frequency is 50 Hz and the voltage is single-phase (220 V) or three-phase (380 V, 660 V, 1.14 kV, 3 kV, 6 kV and 10 kV), and under the specified conditions of use, the basic parameters of the motor-pumps shall comply with the stipulations of Table 1 and Table 2.
4.3.2 The parameters listed in Table 1 are the specified point parameters of single- stage motor-pumps. The specified point parameters of multi-stage motor-pumps shall comply with the motor-pump efficiency under the single-stage motor-pump flow and type in Table 1. The lift shall comply with the design requirements, and the maximum diameter of the passing particles shall be not less than 0.75 times of the single-stage motor-pumps for Level-2 and not less than 0.5 times of the single-stage motor-pumps for Level-3 and above.
4.3.3 When the flow parameter of the motor-pumps does not comply with the stipulations of Table 1 or Table 2, the efficiency of the motor-pumps shall be determined in accordance with the stipulations of Appendix A. Its actual value shall not be lower than the determined value, and the maximum diameter of the passing particles shall be not lower than the value under the diameter and flow rate of the adjacent discharge port in Table 1 or Table 2.
4.3.4 When the motor-pumps have a cutting mechanism, the efficiency of the motor- pumps is [(the value specified in Table 1 or the value determined in Appendix A) - 4%]. 4.3.5 Table 2 specifies the basic parameters of axial-flow or mixed-flow motor-pumps with a vane setting angle of 0??. The other angles are modified products, and their basic parameters shall comply with the requirements determined by the supply-side and the demand-side or the stipulations of the contract, but the efficiency of the motor-pumps shall not be less than [(the value specified in Table 2 or the value determined in Appendix A) - 5 %].
4.3.6 The discharge port diameters of the motor-pumps listed in Table 1 and Table 2 are recommended values. The discharge port diameter may also be determined in accordance with the demands or the stipulations of the contract.
4.3.7 When the synchronous speed of the motor-pumps is inconsistent with Table 1 5 Technical Requirements
5.1 Basic Requirements
5.1.1 The motor-pumps shall comply with the requirements of this document and be manufactured in accordance with the drawings and technical documents approved by the established procedures.
5.1.2 The application and installation of the motor-pumps is divided into four types: mobile installation, auto-coupling installation, wellbore installation and foundation installation, which are determined by the supply-side and the demand-side in accordance with the requirements of the contract.
5.1.3 The motor-pumps shall be able to operate under the following conditions of use continuously and normally:
a) By taking the center of the impeller as the benchmark, the submerged depth shall not exceed 5 m;
b) The temperature of the conveying medium shall not exceed 40 ??C;
c) The pH value of the conveying medium is 4 ~ 10;
d) The volume ratio of the solid phase of the conveying medium is below 3%; e) The kinematic viscosity of the conveying medium is 7 ??? 10-7 m2/s ~ 23 ??? 10-6 m2/s;
f) The largest particle of the solid phase in the conveying medium complies with the stipulations of Table 1 and Table 2;
g) The density of the conveying medium is ??? 1.3 ??? 103 kg/m3.
5.1.4 During the operation of the motor-pumps, the change of the power supply voltage and frequency, and its influence on motor performance and temperature rise limit shall comply with the stipulations of GB/T 755.
5.2 Motor-pump Performance and Deviation
5.2.1 The performance of the motor-pumps is based on the actual speed, and is not converted (i.e., actually measured value).
5.2.2 The rated power of the motors matching the motor-pumps shall comply with the values calculated through Formula (1) and Formula (2):
Where,
???---the density of the conveying medium, expressed in (kg/m3);
g---the acceleration of gravity, g = 9.81 m/s2;
Q---the flow rate, expressed in (m3/h);
H---the lift, expressed in (m);
???SP---the pump efficiency of the motor-pumps, expressed in (%);
PE---the rated power of the motors matching the motor-pumps, expressed in (kW); K---the matching coefficient of the motor-pump power, when p ??? 1.05 ??? 103 kg/m3, K = 1.2; when p > 1.05 ??? 103 kg/m3, K = 1.3;
PN---the shaft power at a specified point of the motor-pumps, expressed in (kW). 5.2.3 The flow rate of the motor-pumps is within the range of 0.7 times to 1.3 times the specified flow rate, and the shaft power shall not exceed the rated power of the motor- pumps.
5.2.4 The lift of the motor-pumps at the specified flow rate shall not be lower than 94% of the specified lift; for the axial-flow type, it shall not be lower than 90% of the specified lift.
5.2.5 Within the range of 0.7 times to 1.3 times the specified flow rate, when the pump shaft power does not exceed the motor-pump power and the efficiency of the motor- pumps is higher than the value specified in this document, it is allowed to reduce the matching power level of the pump motor, but it shall comply with the stipulations of 5.2.3, and the efficiency of the motor-pumps shall be re-determined in accordance with Appendix A and the new motor power.
5.2.6 The lower deviation of the efficiency of the motor-pumps is -0.045 times the specified efficiency of the motor-pumps.
5.2.7 The passing capacity of the motor-pumps shall be greater than or equal to the maximum diameter of the passing particles specified in Table 1 or Table 2. 5.2.8 When the density of the conveying medium p ??? 1.05 ??? 103 kg/m3, it is allowed to reduce the matching power level of the pump motor, but it shall comply with the stipulations of 5.2.3, and the efficiency of the motor-pumps shall be re-determined in accordance with Appendix A and the new motor power.
5.3 Electrical Properties and Requirements of Pump Motors
5.3.1 When the power, voltage and frequency are rated values, the guaranteed values 6.6 Hydrostatic (gas) Pressure Test of Parts Subject to Water Pressure
6.6.1 The hydrostatic (gas) pressure test of the parts of the motor-pumps subject to water pressure shall be carried out on the water (gas) pressure test device. 6.6.2 The parts subject to the water pressure test shall receive anti-rust treatment. The test pressure shall be 1.5 times the working pressure, but the minimum pressure shall not be lower than 0.2 MPa. There shall be no leakage in 3 min.
6.6.3 The whole motor-pump is not disassembled for the test. Parts of the same specifications may be used as a replacement.
6.7 Static (dynamic) Balance Test
6.7.1 The static (dynamic) balance test of the impeller of the motor-pumps and the rotor of the motor shall be performed in accordance with the stipulations of GB/T 9239.1-2006.
6.7.2 The whole motor-pump is not disassembled for the test. Parts of the same specifications may be used as a replacement.
6.8 Lead-out Cables of Motor-pumps
6.8.1 The lead-out cables of the motor-pumps shall comply with the stipulations of 5.6. 6.8.2 The length shall be measured with a tape.
6.9 Air Pressure Test on the Inner Cavity of Pump Motors
6.9.1 The air pressure test on the inner cavity of the pump motors shall be carried out on the air pressure test device.
6.9.2 The test gas shall be post-treatment dry gas. Its requirements shall comply with the stipulations of 5.7.2.
6.9.3 The whole motor-pump is not disassembled for the test. Parts of the same specifications may be used as a replacement.
6.10 Appearance Inspection
The appearance of the motor-pumps shall be inspected by the visual inspection method. It shall comply with the stipulations of 5.7.4.
6.11 Painting
The painting of the motor-pumps shall be performed in accordance with the stipulations of JB/T 5673.
6.12 Protection Test
The protection test of the motor-pumps shall be performed with a multimeter or a monitoring device in accordance with the protection type.
6.13 Test of Terminal Markings and Direction of Rotation
The test of terminal markings and direction of rotation of the motor-pumps shall be performed in accordance with the stipulations of GB/T 1971.
6.14 Inspection of Safety and Safety Signs
6.14.1 The inspection of safety of the motor-pumps shall comply with the stipulations of GB 10395.8.
6.14.2 The inspection of safety signs of the motor-pumps shall comply with the stipulations of GB 10396.
6.15 Reliability Test
The reliability test of the motor-pumps shall be performed in accordance with the stipulations of JB/T 11923.
7 Inspection Rules
7.1 Exit-factory Inspection
7.1.1 Each motor-pump shall pass the inspection and test and be accompanied by a product certificate and instruction manual before exiting the factory.
7.1.2 The exit-factory inspection items shall include:
a) Appearance inspection;
b) Determination of insulation resistance of the stator winding of the pump motor to the enclosure (only the cold-state insulation resistance is measured); c) Voltage resistance test;
d) Test of direction of rotation;
e) Operation status check;
f) Measurement of lift under the specified flow rate;
g) Determination of efficiency of the motor pump at the specified flow rate; h) Inspection of protection devices;
i) Sealing monitoring device test (only applicable to 15 kW and above); motor-pump water or air pressure test, motor no-load characteristic test and motor locked-rotor characteristic test, the process inspection of parts or components may be used as a replacement, and no disassembly is required; g) Determination of maximum particle passing capacity;
h) Reliability test.
7.2.3 The sampling and judgment disposal rules of type inspection shall comply with the stipulations of GB/T 2828.1-2012. It is recommended to adopt one-time sampling scheme for normal inspection. The inspection batch shall satisfy the sample size of at least 2 sets. The inspection level is the special inspection level S-1; the acceptance quality limit (AQL) is 6.5.
8 Marking, Packaging, Storage and Transportation
8.1 Marking
8.1.1 Product marking
8.1.1.1 The plate shall comply with the stipulations of GB/T 13306 and be fixed at an obvious location. The material of the plate and the method of engraving data on the plate shall be able to ensure that the writing is not easy to be worn out during the entire service cycle.
8.1.1.2 The plate shall at least indicate the following contents:
a) The name of the manufacturer;
b) The model and name of the motor-pump;
c) The specified flow rate, expressed in (m3/h);
d) The specified lift, expressed in (m);
e) The rated power, expressed in (kW);
f) The rated voltage, expressed in (V);
g) The rated frequency, expressed in (Hz);
h) The rated current, expressed in (A);
i) The synchronous speed, expressed in (r/min);
j) The vane setting angle (not required, except for adjustable vanes);
k) Number of phases;
l) Thermal classification and temperature rise limit;
m) The diameter of the discharge port, expressed in (mm);
n) The diameter of the maximum particle passed, expressed in (mm);
o) Exit-factory No. and date;
p) Mass (net weight), expressed in (kg);
q) Serial No. of implemented document.
8.1.1.3 The motor-pumps shall have an obvious marking of the direction of rotation. 8.1.2 Packaging marking
The text and signs on the outer wall of the packaging box shall be clear and tidy, and the main contents are as follows:
a) The name of the manufacturer;
b) Product model, name and quantity;
c) Mass (net weight and gross weight together with the packaging), expressed in (kg);
d) Overall dimensions of the packaging box (length ??? width ??? height), expressed in (mm);
e) Appropriate parts of the packaging box shall have necessary signs that comply with the stipulations of GB/T 191.
8.2 Packaging
8.2.1 The packaging of the motor-pumps shall be able to ensure that the product will not be damaged due to improper packaging under normal transportation conditions. 8.2.2 Each motor-pump shall be attached with the following accompanying documents: a) Packing list;
b) Product certificate;
c) Instruction manual;
d) Other necessary accompanying documents.
8.3 Storage
8.3.1 The storage of the motor-pumps shall be well-ventilated and protected from rain

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