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MT 451-2011

Chinese Standard: 'MT 451-2011'
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Standard ID MT 451-2011 (MT451-2011)
Description (Translated English) General specification for low voltage three phases flameproof induction motor for coal mine
Sector / Industry Coal Industry Standard
Classification of Chinese Standard D98
Classification of International Standard 73.100
Word Count Estimation 12,179
Date of Issue 2011-04-12
Date of Implementation 2011-09-01
Older Standard (superseded by this standard) MT 451-1995
Quoted Standard GB/T 191; GB/T 228; GB 755; GB/T 1032; GB/T 1410; GB/T 2423.4; GB 13813; GB 3836.1-2000; GB 3836.2-2000; GB 3836.3-2000; GB/T 4942.1; GB/T 10111; AQ 1043
Drafting Organization Shenyang Research Institute of Coal Research
Administrative Organization Standardization Technical Committee of the coal industry, coal mine safety
Regulation (derived from) ?State Administration of Work Safety Announcement 2011 No.13
Summary This standard specifies the coal mine flameproof safety performance requirements for low-voltage three-phase asynchronous motors, test methods and inspection rules. This standard applies to hazardous methane explosion in a coal mine underground use, rated voltage up to 1140V motor (hereinafter referred to as the motor).

MT 451-2011
ICS 73.100
D 98
Replacing MT 451-1995
General specification for low voltage three phases
flameproof induction motor for coal mine
Issued by. The State Administration of Quality and Technical Supervision
All technical contents of this standard are compulsory.
This standard was drafted according to GB/T 1.1-2009 “Directives for
standardization - Part 1. Structure and drafting of standards”.
This standard is a revision to MT451-1995 "General Specification for Low Voltage
Three Phases Flameproof Induction Motor for Coal Mine". Compared with MT
451-1995, the main changes are as follows.
- ADD English name for this standard;
- ADD GB/T 191-2008 and AQ 1043-2007 in Normative References (Chapter
- ADD environmental conditions (Chapter 3);
- A range value is given to the length L of flameproof joint surface (Section
4.3.1 of this standard. Section 3.3.1 of 1995 version);
- CHANGE hydraulic pressure time from 1min to 10 S (Section 4.2.2 of this
standard. Section 3.2.2 of 1995 version);
- ADD that the flameproof surface roughness between axle and hole shall not
exceed Ra3.2 μm (Section 4.3.3 of this standard. Section 3.3.3 of 1995
- DELETE the content of entry-device’s washers and baffles (Section 4.10.1 of
this standard. Section 3.10.1 of 1995 version);
- CHANGE the flameproof parameter code of flameproof joint surface
(Section 4.3.1 of this standard. Section 3.3.1 of 1995 version);
- ADD that no dripping and damage shall be caused while performing sealing
test on entry-device (Section 4.10.3 of this standard. Section 3.10.3 of 1995
- CHANGE the hardness of rubber seal material to IRHD 45~55 degree
(Section 4.10.4 of this standard. Section 3.10.4 of 1995 version);
- ADD “inspection item name” in list of inspection items. And CHANGE the
"full inspection" to "type inspection" (Table 7 of this standard. Table 7 of 1995
- PROVIDE specific requirements of sampling cardinal number and sampling
quantity in type inspection (Section 6.3.3 of this standard);
- The rated voltage and power were added in nameplate (Section 4.20.2 of
this standard. Section 3.20.2 of 1995 version);
- ADD content related to packing, transport and storage (Chapter 7 of this
This standard was proposed by the Department of Science & Technology
Development of China National Coal Association.
This standard shall be under jurisdiction of the National Technical Committee on
Coal Mine Safety of Standardization Administration of China.
Drafting organization of this standard. Shenyang Institute of China Coal Research
Drafting staffs of this standard. Wang Hui, Kiang Liying, and Feng Liguo.
This standard was issued on December 28, 1995 and revised in August 2009 for
the first time.
Table of Contents
Forward ... 2
1 Scope ... 5
2 Normative References ... 5
3 Normal Operating Conditions of Motor ... 6
4 Safety Performance Requirements ... 6
5 Test Methods ... 12
6 Inspection Rules ... 13
7 Packing, Transport And Storage ... 15
General specification for low voltage three phases
flameproof induction motor for coal mine
1 Scope
This standard specifies the safety performance requirements, test methods and
inspection rules for low voltage three phases flameproof induction motor for coal
This standard is applicable to motor used in coalmine shaft, rated voltage of
1140V and potential methane explosion (hereinafter referred to as motor).
2 Normative References
The following normative documents contain provision which, through reference in
this text, constitute provisions of this standard. For dated reference, the
subsequent amendments (excluding amending error in the text) or revisions of
these publications do not apply. However, all parties reaching an agreement
according to this standard are encouraged to study whether the latest edition of
the normative document is applicable. For undated references, the latest edition of
the normative document referred to applies.
GB/T 191 Packaging-Pictorial Marking for Handling of Goods
GB/T 228 Metallic materials - Tensile testing at ambient temperature
GB 755 General Specifications for Rotary Electrical Machines
GB/T 1032 Test Procedure for Three-phase Induction Motors
GB/T 1410 Methods of Test for Volume Resistivity and Surface Resistivity of
Solid Electrical Insulating Materials
GB/T2423.4 Basic Environmental Testing Procedures for Electric and
Electronic Products - Test Db. Damp Heat, Cyclic"
GB l3813 Testing Method and Judging Rule of Safety to Friction Spark of
Metallic Material for Coal Mine
GB 3836.1-2000 Electrical Apparatus for Explosive Gas Atmospheres - Part
1. General Requirements
GB 3836.2-2000 Electrical Apparatus for Explosive Gas Atmospheres - Part
2. Flameproof Enclosure "d"
GB 3836.3-2000 Electrical Apparatus for Explosive Gas Atmospheres - Part
3. Increased Safety "e"
GB/T 4942.1 Classification of Degrees of Protection Provided by Enclosures
for Rotating Machines
GB/T 10111 Generation of Random Numbers and Procedures Applied to
6.3.1 Type inspection shall be carried out when there is one of the following
a) Trial manufacture and type evaluation of new product or old product
which is transferred production;
b) After formal production, if there is significant changes such as structure,
material and process which may affect the product performance;
c) Every five years under normal production;
d) The production is resumed after a suspension of 2 years;
e) There is significant difference between the results of ex-factory
inspection and last type inspection;
f) Type inspection is required by the state quality supervision organization
or the safety production supervision organization.
6.3.2 The items of type inspection shall comply with those specified in Table 7.
6.3.3 Sampling. according to GB/T 10111. The sampling cardinal number is 10
sets. The sampling quantity is at least 2 sets.
6.3.4 Judgment rule. If there is one sample-item failing to pass the inspection,
then the batch of products will be judged as unqualified.
6.3.5 The products must be inspected by a quality supervision and inspection
center for explosion-proof safety products designated by the State. And they shall
not be manufactured until "explosion-proof certificate" and "coal mine safety sign"
are obtained.
7 Packing, Transport And Storage
7.1 The motor shall be packed when leaving the factory. The outer wall of
Related standard: MT 448-2008    MT/T 459-2007
Related PDF sample: MT/T 661-2011    MT/T 827-2005