All technical content of this part are compulsory.
GB 3836 "Explosive Atmospheres" is consists of the following parts:
— Part 1: Equipment — General Requirements;
— Part 2: Equipment Protection by Flameproof Enclosures "d";
— Part 3: Equipment Protection by Increased Safety "e";
— Part 4: Equipment protection by intrinsic safety "i";
— Part 5: Pressurized Enclosures "p";
— Part 6: Oil-immersion "o";
— Part 7: Power Filling "q";
— Part 8: Type of Protection "n";
— Part 9: Encapsulation "m;
— Part 11: Method of Test for Ascertainment of Maximum Experimental Safe Gap;
— Part 12: Classification of Gases or Vapours with Air according to Their Maximum Experimental Safe Gaps and Minimum Igniting Current;
— Part 13: Repair and Overhaul for Apparatus Used in Explosive Gas Atmospheres;
— Part 14: Classification of Hazardous Areas;
— Part 15: Electrical Installations in Hazardous Areas (other than mines);
— Part 16: Inspection and Maintenance of Electrical Installation (other than mines);
— Part 17: Construction and Use of Rooms or Buildings Protected by Pressurization;
— Part 18: Intrinsically Safe System;
— Part 19: Fieldbus intrinsically safe concept (FISCO);
— Part 20: Equipment with Equipment Protection Level (EPL) Ga;
This part is Part 13 of GB 3836.
1 Scope
This part of GB 3836 gives instructions, principally of a technical nature, on the repair, overhaul, reclamation and modification of equipment designed for use in explosive atmospheres.
This part is not applicable to maintenance, other than when repair and overhaul cannot be disassociated from maintenance, neither does it give advice on cable entry systems which may require a renewal when the equipment is re-installed.
This part is not applicable to type of protection “m”, “o” and “q”.
This part assumes that good engineering practices are adopted throughout.
Note: Much of the content of this part is concerned with the repair and overhaul of electrical machines. This is not because they are the most important items of explosion-protected equipment, but rather because they are often major items of repairable capital equipment in which, whatever type of protection is involved, sufficient commonality of construction exists as to make possible more detailed instructions for their repair, overhaul, reclamation or modification.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 755-2008 Rotating electrical machines — Rating and performance (IEC 60034:2004, IDT)
GB 3836 (all parts) Explosive atmospheres [IEC 60079 (all parts)]
GB 4208-2008 Degrees of protection provided by enclosures (IP Code) (IEC 60529:2001, IDT)
GB/T 11021-2007 Electrical insulation — Thermal evaluation and designation (IEC 60085:2004, IDT)
GB/T 11379-2008 Metallic coatings — Electrodeposited coatings of chromium for engineering purposes (ISO 6158:2004, IDT)
GB/T 12332-2008 Metallic coatings — Electroplated coatings of nickel for engineering purposes (ISO 4526:2004, IDT)
GB 12476.1-2013 Electrical apparatus for use in the presence of combustible dust — Part 1: General requirements (IEC 61241-0:2004, MOD)
GB 12476.7-2010 Electrical apparatus for use in the presence of combustible dust — Part 7: Type of protection “pD” (IEC 61241-4:2001, IDT)
GB/T 19001-2008 Quality management systems — Requirements (ISO 9001:2008, IDT)
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
Serviceable condition
Condition which permits a replacement or reclaimed component part to be used without prejudice to the performance or explosion protection aspects of the equipment, with due regard to the requirements of the certificate documentation as applicable, in which such a component part is used.
3.2
Repair
Action to restore faulty equipment to its fully serviceable condition complying with the relevant standard.
Note: The relevant standard means the standard to which the equipment was originally designed.
3.3
Overhaul
Action to restore to a fully serviceable condition equipment which has been in use or in storage for a period of time but which is not faulty.
3.4
Maintenance
Routine actions taken to preserve the fully serviceable condition of the installed equipment (see Clause 1).
3.5
Component part
An indivisible item.
Note: The assembly of such items may form equipment.
3.6
Reclamation
Means of repair involving, for example, the removal or addition of material to reclaim component parts which have sustained damage, in order to restore such parts to a serviceable condition in accordance with the relevant standard.
Note: The relevant standard means the standard to which the individual parts were originally manufactured.
3.7
Modification
Change to the design of the equipment which affects material, fit, form or function.
Note: As the certificate describes specific construction of the equipment, a modification of the equipment would no longer comply with the construction described in the certificate documentation.
3.8
Manufacturer
Maker of the equipment (who may also be the supplier, the importer or the agent) in whose name usually the certificate, where appropriate, of the equipment was registered.
3.9
Alteration
Change to a product that results in an alternative construction that is described in the certificate documentation.
3.10
User
User of the equipment.
3.11
Repair facility
Facility providing a service that consists of repairs, overhauls, or reclamations of explosion-protected equipment who may be the manufacturer, the user or a third party (repair agency).
3.12
Certificate
Document that assures the conformity of a product, process, system, person, or organization with specified requirements.
3.13
Certificate references
A certificate reference number may refer to a single design or a range of equipment of similar design.
3.14
Certificate for repair
Certificate for the certification of repaired electrical equipments conform to the requirements of relevant standards and achieved serviceable conditions.
3.15
Symbol "X"
Symbol used to denote specific conditions of use.
Note: The symbol “X” is used to provide a means of identifying that essential information for the installation, use, and maintenance of the equipment is contained within the certificate. Therefore, the certificate documents should be studied before such equipment is installed, repaired, overhauled, reclaimed, altered or modified.
3.16
Copy winding
Process by which a winding is totally or partially replaced by another, the characteristics and properties of which are at least as good as those of the original
3.17
Flameproof enclosure “d”
Enclosure in which parts which can ignite an explosive atmosphere are placed and which can withstand the pressure developed during an internal explosion of an explosive mixture and which prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure.
3.18
Type of protection “i”
Type of protection based on the restriction of electrical energy within apparatus and of interconnecting wiring exposed to the potentially explosive gas atmosphere to a level below that which can cause ignition by either sparking or heating effects.
3.19
Type of protection “p”
Technique of guarding against the ingress of the external atmosphere into an enclosure by maintaining a protective gas therein at a pressure above that of the external atmosphere.
3.20
Type of protection “e”
Type of protection applied to electrical apparatus in which additional measures are applied so as to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks in normal service or under specified abnormal conditions.
3.21
Type of protection “n”
Type of protection applied to the electrical equipment such that, in normal operation and in certain specified regular expected occurrences, it is not capable of igniting the surrounding explosive gas atmosphere.
3.22
Type of protection “tD” or Group III “t”
Type of protection for explosive dust atmospheres where electrical equipment is provided with an enclosure providing dust ingress protection and a means to limit surface temperatures.
3.23
Type of protection “pD”
Technique of applying a protective gas to an enclosure in order to prevent the formation of an explosive dust atmosphere inside the enclosure by maintaining an overpressure against the surrounding atmosphere.
4 General
4.1 General principles
This clause covers those aspects of repair, overhaul, reclamation, alteration, and modification which are common to all explosion-protected equipment. Subsequent clauses provide instructions for the additional requirements relevant to specific types of protection. When equipment incorporates more than one type of protection, reference shall be made to the appropriate clauses.
Note 1: Additional requirements for types of protection “m”, "o" and "q" have not been defined.
Foreword II
Introduction IV
1 Scope
2 Normative References
3 Terms and Definitions
4 General
5 Additional Requirements for the Repair and Overhaul of Equipment with Type of Protection "d" (Flameproof)
6 Additional Requirements for the Repair and Overhaul of Equipment with Type of Protection "i" (Intrinsic Safety)
7 Additional Requirements for the Repair and Overhaul of Equipment with Type of Protection "p" (Pressurized)
8 Additional Requirements for the Repair and Overhaul of Equipment with Type of Protection "e" (Increased Safety)
9 Additional Requirements for the Repair and Overhaul of Equipment with Type of Protection "n"
10 Additional Requirements for the Repair and Overhaul of Equipment Covered by GB
11 Additional Requirements for the Repair and Overhaul of Equipment with Type of Protection Group “tD” (III “t” or DIP)
12 Additional Requirements for the Repair and Overhaul of Equipment with Type of Protection Pressurization “pD”
Appendix A (Normative) Identification of Repaired Equipment by Marking
Appendix B (Normative) Knowledge, Skills and Competencies of “Responsible Persons” and “Operatives”
Appendix C (Normative) Requirements for Measurements in Flameproof Equipment During Overhaul, Repair and Reclamation (Including Guidance on Tolerances)
Figure C.1 Determination of Maximum Gap of Reclaimed Parts
