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

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