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GB/T 24674-2009 (GB/T24674-2009)

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GB/T 24674-2009: PDF in English (GBT 24674-2009)
GB/T 24674-2009
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.060.35
B 91
Waste submersible motor-pumps
ISSUED ON: NOVEMBER 30, 2009
IMPLEMENTED ON: APRIL 01, 2010
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Type, model, basic parameters ... 6 
4 Technical requirements ... 16 
5 Test methods ... 26 
6 Inspection rules ... 27 
7 Marking, packaging, storage and transportation ... 29 
Appendix A (Normative) Determination of motor-pump efficiency ... 32 
Waste submersible motor-pumps
1 Scope
This standard specifies the type, model, basic parameters, technical
requirements, test methods, inspection rules and markings, packaging, storage
and transportation of waste submersible motor-pumps.
This standard is applicable to single-phase or three-phase waste submersible
motor-pumps (hereinafter referred to as "motor-pumps") that transport various
types of waste or mixed liquids containing insoluble solid phase materials such
as sediment, fiber, manure, river mud.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 191 Packaging - Pictorial marking for handling of goods (GB/T 191-
2008, ISO 780:1997, MOD)
GB 755 Rotating electrical machines - Rating and performance (GB 755-
2008, IEC 60034-1:2004, IDT)
GB/T 1176 Specification for cast copper alloys (GB/T 1176-1987, neq ISO
1338:1977)
GB/T 1220 Stainless steel bars
GB/T 1348 Spheroidal graphite iron castings (GB/T 1348-2009, ISO
1083:2004, MOD)
GB 1971 Rotating motor - Line end mark and direction of rotation (GB/T
1971-2006, IEC 60034-8:2002, IDT)
GB/T 2828.1-2003 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection (ISO 2859-1:1999, IDT)
3 Type, model, basic parameters
3.1 Type
3.1.1 The motor-pump is a single-stage or multi-stage vertical type. The pump
is coaxial with the motor.
3.1.2 Motor-pump is divided as follows according to the structure of the impeller:
a) Spiral-flow type impeller;
b) Semi-open vane impeller;
c) Closed vane impeller;
d) Single or double flow impeller;
e) Spiral centrifugal impeller;
f) Mixed flow impeller;
g) Axial flow impeller.
3.1.3 Motor-pump’s type features are indicated by uppercase Chinese phonetic
alphabet:
X - Spiral-flow type;
H - Mixed flow type;
Z - Axial flow type;
The impeller structure is not marked in case of flow path type, spiral centrifugal
type, closed type, semi-open type.
3.1.4 The characteristics of the motor-pump’s motor are indicated by uppercase
Chinese phonetic alphabet:
S - Water-filled;
Y - Oil-filled;
D - Single-phase;
G - High voltage (660V and three-phase dry motor and below are not
marked).
3.1.5 The IP code of the motor-pump’s housing is IPX8 as specified in GB/T
4942.1-2006. The IP code of special requirements is to be determined by the
requirements. The maximum diameter of the passing particles shall be not less
than 0.75 times of the single-stage motor-pump for the level 2; it shall be not
less than 0.5 times of the single-stage motor-pump for the level 3 and above.
3.3.3 When the flow parameters of the motor-pump do not meet the
requirements of Table 1, the efficiency of the motor-pump is determined
according to the provisions of Appendix A; meanwhile the actual value shall not
be lower than the determined value.
3.3.4 When the motor-pump has a cutting mechanism, the efficiency of the
motor-pump is [(the value specified in Table 1 or according to the value as
determined in Appendix A) - 4%].
3.3.5 For oil-filled motor-pumps, the efficiency of the motor-pump is [(the value
as specified in Table 1, Table 2 or the value determined in Appendix A) - 5%];
for the water-filled motor-pump, the efficiency of the pump is [(the value as
specified in Table 1, Table 2 or the value determined in Appendix A) - 3%].
3.3.6 Table 2 specifies the basic parameters of the axial flow or mixed flow
motor-pump which has a blade placement angle of 0°. For the modified
products of other angles, the basic parameters shall meet the requirements
determined by the supplier and purchaser or the contract, but the efficiency of
motor-pump shall not be less than [(the value as specified in Table 2 or as
determined in Appendix A) - 5%].
3.3.7 The discharge diameter of the motor-pump as listed in Tables 1 and 2 is
the recommended value; the discharge diameter may also be determined
according to requirements or according to the contract.
3.3.8 When the synchronous speed of the motor-pump does not match Tables
1 and 2, it may be increased or decreased according to needs or according to
the contract, but the efficiency of the motor-pump shall not be lower than the
provisions of this standard.
4 Technical requirements
4.1 Motor-pumps shall comply with the requirements of this standard and be
manufactured in accordance with the drawings and technical documents
approved by the prescribed procedures.
4.2 The motor-pump shall be able to operate continuously under the following
conditions of use:
a) With the center of the impeller as reference, the submerged depth is not
more than 5 m;
4.7 When the insulation resistance of the stator winding of the motor-pump’s
motor is cold state, it shall not be less than 50 MΩ for voltages of 660 V and
below; it shall be not less than 100 MΩ for voltages above 660 V.
4.8 When the insulation resistance of the stator winding of the motor-pump
motor is in the hot state, the voltage shall be no less than 1 MΩ for the voltage
of 660 V and below; it shall not be lower than the value obtained by formula (3)
for the voltage above 660 V:
Where:
R - The insulation resistance of winding, in megaohms (MΩ);
U - The rated voltage of the winding, in volts (V);
P - The rated power, in kilowatts (kW).
4.9 The stator winding of the motor-pump’s motor shall be able to withstand the
withstanding voltage test for 1 min without breakdown. The frequency of the
test voltage is 50 Hz, meanwhile it shall be in the sinusoidal waveform as far as
possible. The effective value of the test voltage is twice the rated voltage plus
1000 V. When a mass and continuously produced motor-pumps are subjected
to an inspection test, it allows to use the test of 120% of the test voltage for a
duration of 1 s to substitute it. The test voltage is applied by a test bar. The
flushing motor-pump shall be immersed in clean water at normal temperature
for 12 hours before the test.
This test shall not be repeated for the same motor. If requested by the user, it
is allowed to carry out another rated test on the construction site before starting
operation after installation. The test voltage shall not exceed 80% of the above
specified. If necessary, the motor shall be dried before the test.
4.10 The stator winding of the motor-pump’s motor shall withstand the inter-turn
impulse withstanding voltage test without breakdown. When carrying out the
inter-turn impulse withstand voltage test, for a motor which has a voltage of 660
V or less, the test impulse voltage peak is 2000 V for single phase, 2300 V for
three-phase power of 3 kW and below, 2600 V for power of 3 kW and above;
for the voltage above 660 V, the peak value of the impulse voltage of coil test
shall meet the requirements of JB/Z 293.
4.11 When the three-phase power supply is balanced, the deviation of any one
of the three-phase no-load currents of the motor-pump’s motor from the
average value of the three phases shall not exceed 10% of the average value.
4.13.5 The safety requirements of motor-pumps shall comply with the
provisions of GB 10395.8.
4.13.6 The safety marking of the motor-pump shall comply with the provisions
of GB 10396.
4.14 Parts of the motor-pump that are subjected to working pressure shall be
subjected to a hydraulic/pneumatic test without leakage. The test pressure is
1.5 times the working pressure, but the minimum shall not be less than 0.2 MPa,
for a duration of 3 minutes.
4.15 After the motor-pump is assembled, the inner cavity of the motor shall be
able to withstand the pneumatic test of 0.2 MPa for 3 min without leakage. The
sealing device shall be able to withstand the pneumatic test of 0.2 MPa for 3
min without leakage. For the water-filled type, the pressure is 0.05 MPa.
4.16 The motor-pump shall have reliable anti-corrosion measures. The surface
of the motor-pump shall be free from defects such as dirt, bumps, cracks.
4.17 Motor-pump’s painting shall comply with the provisions of JB/T 5673.
4.18 The motor-pump shall rotate smoothly, freely, without jamming and other
abnormality.
4.19 The motor-pump’s motor shall be able to withstand 150% of rated current
without loss or deformation under thermal conditions. The overcurrent time shall
be not less than 30 s for the motor-pumps of 660 V and below; not less than 15
s for the motor-pump of 660 V above. It can also be determined by the user and
the manufacturer through negotiation, but the maximum overcurrent time shall
be not more than 60 s for the motor-pumps of 660 V and below; not more than
30 s for the motor-pump of 660 V above.
4.20 Under the specified conditions of use, the average working time of the
motor-pump before the first failure shall be not less than 2000 h.
4.21 Flange connection of the discharge cast iron pipe of the motor-pump shall
comply with the provisions of GB/T 17241.6. It may be supplied according to
the contract if there are special needs.
4.22 The noise value of the A-weighted sound power level measured by the
motor-pump’s motor at no load shall not exceed the requirements of Table 5.
Table 5
Rated power,
kW
Allowable
noise value
dB(A)
is calculated as 0.015 RN·m, wherein R is the impeller diameter, in meters
(m).
4.25 Material requirements for main components of motor-pump
4.25.1 The performance of the exposed fasteners shall be not less than that of
2Cr13 stainless steel. It may be carried out according to special requirements
or contract, if any.
4.25.2 The iron castings of motor-pumps shall comply with the relevant
provisions of GB/T 9439 and GB/T 1348 and JB/T 6880.1 ~ 6880.3. The
stainless steel parts of motor-pumps shall comply with the relevant provisions
of GB/T 1220. The bronze parts of the motor-pump shall comply with the
relevant provisions of GB/T 1176.
4.26 The installation type of motor-pump is divided into four types: mobile
installation, auto-coupling installation, wellbore installation, basic installation,
which will be determined by the supplier and purchaser according to the
contract requirements.
5 Test methods
5.1 The efficiency of the motor-pump shall be measured by the actual
measurement method; its value shall be determined according to formula (6):
Where:
ηDB - The motor-pump’s efficiency, %;
Pr - Water power, in kilowatts (kW);
Pl - The input power, in kilowatts (kW).
5.2 The performance test of the motor-pump shall be carried out in accordance
with the requirements of Level 2 of GB/T 12785-2002.
5.3 The inter-turn insulation test of the stator winding of the motor with a voltage
of 660 V and above shall be carried out in accordance with JB/Z 293.
5.4 The protection test of the motor-pump is carried out according to the
protection type by the use of a multimeter or monitoring device.
5.5 The hydrostatic pressure test of the parts subjected to water pressure in the
motor-pump shall be carried out on the hydrostatic test device; the
i) Test of seal monitoring device test (only for 15 kW and above);
j) Inspection of the grounding mark;
k) Inspection of safety mark.
Full inspection for items a), b), c), d), h), i), j), k); spot inspection for items e), f),
g).
6.1.3 Sampling, judgment, disposal rules shall comply with the provisions of
GB/T 2828.1-2003. It may use the normal inspection once sampling plan. The
inspection batch is the product output per month (or day) or one order batch
(unit). The inspection level is the general inspection level II, the acceptance
quality limit (AQL) is 4.0. It can also be determined between the supplier and
the buyer through negotiation.
6.2 Type inspection
6.2.1 Type inspection shall be carried out in any of the following cases:
a) Type identification of trial-produced new products or trans-plant produced
old products;
b) After formal production, if there are major changes in structure, materials
and processes, which may affect product performance;
c) When the production is restored after suspension for a long time;
d) When the products produced in batches are subject to periodic inspections
(at least once a year);
e) When the exit-factory inspection result is significantly different from the
previous type inspection;
f) When the national quality supervision agency requests the type inspection.
6.2.2 Type inspection items include:
a) All items of exit-factory inspection;
b) Temperature rise test;
c) Determination of the hydraulic characteristic curve of the motor-pump;
d) Determination of the flow characteristic curve of the motor-pump (including
lift-flow curve; input power-flow curve; motor-pump efficiency-flow curve);
e) Determination of the load characteristic curve of the motor (including
power factor-input power curve; stator current-input power curve);
f) The rated voltage, in volts (V);
g) The rated frequency, in Hertz (Hz);
h) The rated current, in amps (A);
i) The synchronous speed, in revolutions per minute (r/min);
j) The blade’s placement angle (except for adjustable blades);
k) The number of phases;
l) Thermal classification or temperature rise limits;
m) The discharge diameter, in millimeters (mm);
n) The exit-factory number and date;
o) The mass (net weight), in kilograms (kg);
p) The implemented standard number.
7.1.1.3 The motor-pump shall have an obvious rotation mark.
7.1.2 Packaging mark
The text and marking on the outer wall of the box shall be clear and tidy. The
main contents are as follows:
a) The name of the manufacturer;
b) The product model, name and quantity;
c) The mass (net weight and gross weight associated with the package), in
kilograms (kg);
d) The outer dimensions of the package: length (mm) × width (mm) × height
(mm);
e) Appropriate parts of the package shall have the necessary markings in
accordance with GB/T 191.
7.2 Packaging
7.2.1 The packaging of the motor-pump shall ensure that the product will not be
damaged due to poor packaging under normal transportation conditions.
7.2.2 Each motor-pump shall be accompanied by the following documents:
a) The packing list;
Appendix A
(Normative)
Determination of motor-pump efficiency
A.1 Parameters of motor-pump at specified point
A.1.1 Under the condition of clean cold water, the parameters of the pump at
specified points shall comply with the provisions of Table 1, Table 2, Figure A.
A.1.2 When the parameters of the pump do not match Tables 1 and 2, the
efficiency shall be in accordance with the efficiency of the motor-pump under
the corresponding flow rate in Figure A.1. The efficiency of the spiral-flow pump
shall be in accordance with the value on the curve B under the corresponding
flow rate of Figure A.1. The efficiency of other types of pumps shall be in
accordance with the value on the curve A at the corresponding flow rate in
Figure A.1.
A.2 Performances of motor-pump motor at specified point
At the rated voltage, rated efficiency, rated power, the guaranteed value of the
specified performance parameters of the motor-pump motor shall comply with
the requirements of Table 3.
A.3 Motor-pump efficiency
The efficiency of the motor-pump is determined by the formula (A.1):
Where:
ηDB - Motor-pump efficiency, %;
ηD - Efficiency of motor-pump’s motor, %;
ηSP - Pump efficiency specified flow rate and type of motor-pump, %.
Note: For the efficiency of the single-phase capacitor running motor, plus 5% to the
corresponding value specified in Table 3, then calculate it according to formula (A.1).
......
 
(Above excerpt was released on 2019-11-30, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT24674-2009