GB/T 24674-2021 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 24674-2021 | English | 380 |
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Waste submersible motor-pumps
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| GB/T 24674-2009 | English | 190 |
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Waste submersible motor-pumps
| Obsolete |
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GB/T 24674-2021: Waste submersible motor-pumps---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT24674-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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’s 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
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
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
4 Types, Models and Basic Parameters
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.
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°.
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.
5.1.4 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 Test Methods
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.
6.8 Lead-out Cables of Motor-pumps
6.9 Air Pressure Test on the Inner Cavity of Pump Motors
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 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.
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 Marking, Packaging, Storage and Transportation
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.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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