GB/T 24674-2021Waste submersible motor-pumps (English PDF)

4.1 Types

4.1.1 The motor-pump is a single-stage or multi-stage vertical structure. The pump is coaxial with the motor.

4.1.2 In accordance with the structure of the impeller, the motor-pump is divided into.

4.1.3 The type characteristics of the motor-pumps are represented in capital Chinese phonetic alphabet.

4.1.4 The characteristics of the pump motors are represented in capital Chinese phonetic alphabet.

4.1.5 The degree of protection provided by the enclosure of the motor-pumps is IPX8 specified in GB/T 4942.1-2006. Specially requested protection degree shall be negotiated and determined by the supply-side and the demand-side in accordance with the stipulations of GB/T 4942.1-2006.

4.2 Models

4.2.1 The model of the motor-pumps is composed of capital Chinese phonetic alphabet and Arabic numerals, etc. The method of representation is as follows.

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.

5.1.4 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).

5.2.5 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.

5.3 Electrical Properties and Requirements of Pump Motors

5.3.1 When the power, voltage and frequency are rated values, the guaranteed values of efficiency and power factor shall comply with the stipulations of Table 3 and Table 4.

5.4 Material Requirements for Main Components of Motor-pumps

5.4.1 The exposed stainless steel fasteners shall comply with the stipulations of GB/T 3098.6. They may also comply with special requirements or contract stipulations 5.4.2 The castings shall comply with the stipulations of GB/T 9439 or GB/T 1348 or

JB/T 6880.1, JB/T 6880.2 and JB/T 6880.3.

5.5 Requirements for Main Parts and Components of Motor-pumps

5.5.1 If the discharge cast iron pipe of the motor-pumps is Flange connection, it shall comply with the stipulations of GB/T 17241.6. If there are special demands, it may be provided in accordance with the contract.

6.1 Test Requirements

6.1.1 The test method of the motor-pumps shall comply with the stipulations of GB/T 12785-2014.

6.2 Efficiency of Motor-pumps

The efficiency of the motor-pumps shall be measured by the actual measurement method, and its value shall be determined in accordance with Formula (6).

6.3 Measurement of Maximum Diameter of Passing Particles

6.3.1 The maximum diameter of passing particles shall comply with the stipulations of 18.1 in GB/T 12785-2014.

6.4 Performance Test of Pump Motors

6.4.1 The performance test of the pump motors shall be performed in accordance with the stipulations of GB/T 12785-2014.

6.4.2 The performance test of the pump motors is performed without disassembly.

Parts of the same specifications or process inspection records 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.

6.14 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.

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.

7.1.3 The sampling and judgment disposal rules shall comply with the stipulations of

GB/T 2828.1-2012. One-time sampling scheme for normal inspection may be adopted.

7.2 Type Inspection

7.2.1 Under any of the following circumstances, type inspection shall be conducted.

7.2.2 The type inspection items include.

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.

8.1 Marking

8.1.1 Product marking

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.

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.

8.3 Storage

8.3.1 The storage of the motor-pumps shall be well-ventilated and protected from rain and sun. When they are stored in the open air, measures like rain and sun protection shall be taken.

8.4 Transportation

8.4.1 The transportation modes and requirements of the motor-pumps shall be determined by the supply-side and the demand-side through negotiation.