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GB/T 18664-2002 English PDF (GBT18664-2002)

GB/T 18664-2002 English PDF (GBT18664-2002)

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GB/T 18664-2002: Selection, use and maintenance of respiratory protective equipment

This standard specifies the principles, methods and requirements for the selection, use and maintenance of respiratory protective equipment. This standard applies to respiratory protective equipment used to prevent harm to the human body from oxygen deficiency and airborne contaminants in the workplace. This standard does not apply to breathing equipment for underwater operations, aviation and medical rescue.
GB/T 18664-2002
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 13.340.30
C 73
Selection, use and maintenance of respiratory
protective equipment
ISSUED ON: MARCH 12, 2002
IMPLEMENTED ON: OCTOBER 01, 2002
Issued by: General Administration of Quality Supervision, Inspection and Quarantine
Table of Contents
Foreword ... 4
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms, definitions and abbreviations ... 7
3.1 Terms and definitions ... 7
3.2 Abbreviations ... 12
4 Choice of respiratory protective equipment ... 12
4.1 General principles ... 12
4.2 Selection by hazardous atmosphere ... 13
4.3 Selection according to operating conditions ... 18
4.4 Selection according to operator ... 19
5 Use of respiratory protective equipment ... 20
5.1 General principles ... 20
5.2 Use of respiratory protective equipment in IDLH atmosphere ... 22
5.3 Use of respiratory protective equipment in low temperature environments .. 22 5.4 Replacement of filter elements of air-purifying respiratory protective equipment ... 22
5.5 Use of supplied air respiratory protective equipment ... 23
6 Maintenance of respiratory protective equipment ... 24
6.1 Inspection and maintenance of respiratory protective equipment ... 24 6.2 Cleaning and disinfection of respiratory protective equipment ... 24 6.3 Storage of respiratory protective equipment ... 25
7 Respiratory protection plan ... 25
7.1 General principles ... 25
7.2 Contents of respiratory protection plan ... 26
7.3 Training contents of respiratory protection ... 26
Appendix A (Informative) Factors to consider in evaluation of hazardous atmosphere ... 28
Appendix B (Normative) IDLH concentration ... 29
Appendix C (Informative) Warning of toxic gases and vapors ... 41
Appendix D (Informative) Examples for selection of respiratory protective equipment ... 43
Appendix E (Informative) Fit test ... 46
Appendix F (Informative) Medical evaluation of the ability to use respiratory protective equipment ... 54
Appendix G (Normative) Face-seal check ... 56
Appendix H (Informative) Check method for respiratory protection plan ... 58 References ... 61
Selection, use and maintenance of respiratory
protective equipment
1 Scope
This standard specifies the principles, methods and requirements for the selection, use and maintenance of respiratory protective equipment.
This standard applies to respiratory protective equipment used to prevent harm to the human body from oxygen deficiency and airborne contaminants in the workplace.
This standard does not apply to breathing equipment for underwater operations, aviation and medical rescue.
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 2891-1995 Performance test methods for facepiece of filter type
respirator
GB 3836.1 Electrical apparatus for explosive gas atmospheres - Part 1:
General requirements
GB 3836.2 Electrical apparatus for explosive gas atmospheres - Part 2:
Flameproof enclosure ?€?d?€?
GB 3836.4 Electrical apparatus for explosive atmospheres - Intrinsically safe circuits and electrical apparatus
GB 8958 Safety regulation for working under hazardous condition of the
oxygen deficiency
Atmosphere-supplying respiratory protective equipment
Respiratory protective equipment capable of isolating the wearer's
respiratory organs from the working environment, relying on the air source carried by the wearer or relying on an air pipe to introduce a clean air source other than the working environment.
[GB/T 12903-1991, definition 4.1.21]
3.1.7
Supplied air respiratory protective equipment
An atmosphere-supplying respiratory protective equipment that introduces in clean air via an airway tube through the breathing of the wearer or by mechanical force.
[GB/T 12903-1991, definition 4.2.1.1]
3.1.8
Self-contained breathing apparatus
An atmosphere-supplying respiratory protective equipment which uses the air source from the air bottle or oxygen bottle or an oxygen generator as carried by the wearer.
[GB/T 12903-1991, definition 4.1.2.2]
3.1.9
Negative-pressure respiratory protective equipment
A respiratory protective equipment, the pressure in the facepiece of which in a breathing cycle is less than the atmospheric pressure in the inhalation stage of the user.
[GB 16556-1996, definition 3.2]
3.1.10
Positive-pressure respiratory protective equipment
A respiratory protective equipment, the pressure in the facepiece of which in a breathing cycle is more than the atmospheric pressure.
[GB 16556-1996, definition 3.3]
3.1.11
The tiny solid particles suspended in the air, which are generally produced by the condensation of gas or vapor, whose particle size is usually smaller than that of dust.
3.1.18
Mist
Tiny droplets suspended in the air.
3.1.19
Low boiling point organic compound
Organic compounds which have a boiling point below 65 ??C.
3.1.20
Hazardous atmosphere
Anoxic or atmospheric environment in which airborne contaminant
concentrations exceed the value as specified by national occupational health standards.
3.1.21
Immediately dangerous to life and health concentration
The concentration of airborne contaminants in the hazardous atmosphere
reaches a certain dangerous level, which can be fatal, or can permanently damage health, or can make people immediately lose their ability to escape. 3.1.22
Filter element
Filter material or filter component which is used by the respiratory protective equipment to filter out harmful substances in the air.
Examples: canisters (filter cartridge), dust canisters, filter media, etc. 3.1.23
End-of-service-life indicator
A system that warns the user that respiratory protection is approaching a failure.
3.1.24
The ratio of the concentration of airborne contaminants to the concentration limit as specified by the national occupational health standard, which takes an integer.
3.2 Abbreviations
The following abbreviations apply to this standard.
APF: Assigned protection factor
IDLH: Immediately dangerous to life and health
SCBA: Self-contained breathing apparatus
4 Choice of respiratory protective equipment
4.1 General principles
4.1.1 Without protection, no one shall be exposed to an air environment that can or may endanger health.
4.1.2 It shall, according to the relevant national occupational health standards, evaluate the air environment in which the operation is conducted (see Appendix A for various factors to be considered in the evaluation), to identify the nature of the hazardous atmosphere and determine the degree of harm.
4.1.3 It shall first consider the possibility of taking engineering measures to control hazardous atmosphere. If the engineering control measures cannot be implemented due to various reasons, or the hazardous atmosphere cannot be completely eliminated, during the period when the engineering control
measures are not effective, it shall select the appropriate respiratory protective equipment according to the provisions of 4.2, 4.3, 4.4 of this standard. See Table 1 for classification of respiratory protective equipment. The selection procedure is as shown in Figure 1.
4.1.4 It shall select the nationally recognized respiratory protective equipment that meets the requirements of the standard.
4.1.5 When selecting respiratory protective equipment, it shall also refer to the technical requirements in the instruction manual and meet its applicable conditions.
4.1.6 If it is necessary to use respiratory protective equipment to prevent hazard from dangerous atmosphere, the employer shall establish and implement a standardized respiratory protection plan.
shall select the respiratory protective equipment capable of filtering
particle and its volatile gases simultaneously;
b) It shall select suitable dust facepiece according to the dispersion of the particle;
c) If the particle is liquid or oily, it shall select the respiratory protective equipment with suitable filter element;
d) If the particle is radioactive, it shall select the dust facepiece with the highest filtration efficiency.
4.2.4.2 Protection against toxic gases and vapors
It may select atmosphere-supplying or air-purifying respiratory protective equipment (see Table 3). If selecting the air-purifying type, it shall pay attention to the following points:
a) Select applicable filter elements according to the types of toxic gases and vapors; for the filter element types not included in the current standards, it shall be selected according to the instructions provided by the
manufacturers of respiratory protective equipment;
b) For toxic gases or vapors without warning or poor warning, it shall give priority to respiratory protective equipment which has end-of-service-life indicator or atmosphere-supplying respiratory protective equipment.
4.2.4.3 Simultaneous protection against parasites, toxic gases or vapors It may select atmosphere-supplying or air-purifying respiratory protective equipment (see Table 3). If selecting the air-purifying type, it shall select the effective filter element or the combination of filter element.
other personal protective equipment;
b) If there is a foreseeable emergency dangerous situation during operation, it shall select the appropriate escape type respiratory protective
equipment according to the nature of the danger, or select the respiratory protective equipment according to the provisions of 4.2.3.1 of this
standard;
c) If the hazardous atmosphere is an explosive atmosphere, the respiratory protective equipment selected shall comply with the provisions of GB
3836.1, GB 3836.2 and GB 3836.4; if SCBA is selected, it shall select the air respirators, it shall not select oxygen respirators;
d) If it selects the supplied air respiratory protective equipment, it shall pay attention to the distance between the work site and the air source, the obstruction of the air hose to other workers on the site, the damage or cut off the air supply pipeline; take possible precautions;
e) If there is high temperature, low temperature or high humidity on site, or organic solvents and other corrosive substances, it shall choose
respiratory protective equipment which is resistant to high temperature, low temperature or corrosion, or choose supplied air respiratory protective equipment that can adjust temperature and humidity;
f) If the operation intensity is high, or the operation time is long, it shall select the respiratory protective equipment with a lower respiratory load, such as supplied air or powered air-purifying respiratory protective equipment; g) If there is a need for clear vision, it shall choose a respiratory protective equipment with a better vision;
h) If there is a need for language communication, it shall select the
respiratory protective equipment with suitable communication functions. 4.4 Selection according to operator
4.4.1 Head and facial features
When choosing a half facepiece or full facepiece, it shall pay attention to: a) If the manufacturer or distributor of respiratory protective equipment can provide the user with a fit test, it can help the user to choose a suitable tight-fitting facepiece. For the fit test method, see Appendix E;
b) The beard or long hair will affect the fitting between the facepiece and the face. The user shall shave the beard in advance to avoid pinching the hair equipment. Relevant operators and other entrants in the workplaces that must be equipped with escape type respiratory protective equipment shall be trained in the use of escape type respiratory protective equipment. SCBA shall be used only by specially trained personnel.
5.1.4 Before use, it shall check the integrity of the respiratory protective equipment, the suitability of the filter elements, the battery power, the gas storage capacity of the gas cylinder, etc.; eliminate the non-compliance before allowing use.
5.1.5 Before entering the hazardous atmosphere, wear respiratory protective equipment. For tight-fitting facepieces, the user shall perform a face-seal check, to confirm tightness. See Appendix G for the face-seal check methods.
5.1.6 Personnel working in hazardous atmosphere shall always wear
respiratory protective equipment.
5.1.7 The use of escape type respiratory protective equipment alone is not allowed to enter the hazardous atmosphere; it only allows to use it to leave from it.
5.1.8 When it has uncomfortable symptoms such as feeling of odor, cough, irritation, nausea, etc., it shall leave the hazardous atmosphere immediately; check the respiratory protective equipment; determine and eliminate the fault before re-entering the hazardous atmosphere. If there is no fault, it shall replace the effective filter elements.
5.1.9 If the respiratory protective equipment uses several filter elements at the same time, such as double filter cartridges, they shall be replaced at the same time.
5.1.10 If the new filter element fails quickly in some cases, it shall re-evaluate the applicability of the selected filter element.
5.1.11 Except for general-purpose components, without the approval of the manufacturer of respiratory protective equipment, components of different brands of respiratory protective equipment shall not be assembled or used in combination.
5.1.12 All personnel using respiratory protective equipment shall undergo regular physical examinations, to regularly evaluate their ability to use respiratory protective equipment. For evaluation methods, see Appendix F. c) When a person using a manual air-purifying dust-proof respiratory
protective equipment feels that the air supply resistance has increased significantly.
5.4.2 Replacement of gas filter element
The service life of the gas filter element is affected by factors such as the type and concentration of airborne contaminants, the user's breathing frequency, ambient temperature, humidity conditions. Generally, the replacement time of the gas filter element is determined as follows:
a) When the user feels the smell or irritation of airborne contaminants, they shall be replaced immediately;
Note: The use of airborne contaminant?€?s odors or irritants to judge the failure of filter elements is limited (see Appendix C).
b) For routine operations, it is recommended to determine the replacement schedule of filter elements based on experience, experimental data or
other objective methods; replace them regularly;
c) Record the usage time after each use, to help determine the replacement time;
d) The service life of ordinary organic gas filter elements for low-boiling organic compounds will generally be shortened and shall be replaced in
time after each use; for the protection of other organic compounds, if they are used several days or weeks apart, they shall also be replaced when
they are reused.
5.5 Use of supplied air respiratory protective equipment
5.5.1 It shall check the quality of the air supply source before use. The air supply shall not be deficient in oxygen and the concentration of airborne contaminants shall not exceed the relevant national occupational health standards or relevant air supply air quality standards.
5.5.2 Gas supply pipe?€?s joints are not allowed to be shared with other gas pipe joints in the workplace.
5.5.3 It shall avoid the interference between the air supply pipe and other moving objects on the job site; it is not allowed to roll over the air supply pipe. to the instruction manual. Use a soft brush to wash it in warm water, or add an appropriate amount of neutral detergent to the warm water. Rinse in clean water and dry in a clean place.
6.2.4 If it is necessary to use a broad-spectrum disinfectant for disinfection, when selecting a disinfectant, especially if it is necessary to prevent the spread of special pathogens, first consult the manufacturer of respiratory protective equipment and industrial hygiene experts. It shall pay special attention to the instructions of the disinfectant manufacturer, such as dilution ratio, temperature and disinfection time.
6.3 Storage of respiratory protective equipment
6.3.1 Respiratory protective equipment shall be stored in a clean, dry place without oil, direct sunlight or corrosive gases.
6.3.2 If respiratory protective equipment is used infrequently, it is recommended to store the respiratory protective equipment in a sealed bag. Avoid distorting the facepiece during storage.
6.3.3 The gas filter element shall not be stored open.
6.3.4 All respiratory protective equipment used in emergency situations and rescue shall be kept in a standby state and placed in a location suitable for storage, easy to manage, easy to use; it shall not change the storage place at will.
7 Respiratory protection plan
7.1 General principles
7.1.1 In order to ensure the accurate implementation of the requirements of this standard, the employer shall establish and implement a standardized
respiratory protection plan. Make the purchase, use, maintenance of respiratory protective equipment be an important part of the management of the employer; record the implementation of this plan in a written manner.
7.1.2 An employer shall arrange a supervisor to be responsible for the
respiratory protection plan. The supervisor shall be properly trained and have the relevant knowledge and responsibilities to manage and effectively
implement the plan.
7.1.3 When changes in operating conditions may affect the use of respiratory protective equipment, it shall adjust the respiratory protection plan in a timely Appendix C
(Informative)
Warning of toxic gases and vapors
C.1 Limitations for determining the existence of harmful gases by smell Limitations for determining the existence of harmful gases by smell:
a) The individual smell is very different, some people cannot detect the existence of certain harmful gases or vapors by smell, for example, some people is not sensitive to the bitter almond smell of hydrogen cyanide, or cannot feel this taste;
b) Colds or rhinitis can reduce people's smell;
c) The odor of airborne contaminants may be masked by other odors;
d) When the concentration is gradually accumulated, due to olfactory fatigue, some high-concentration airborne contaminants cannot be detected, such
as hydrogen sulfide. If people have been working in an environment where hydrogen sulfide is gradually accumulated to reach dangerous
concentrations, they may sense no smell; however, when people enter the environment from the outside, they will feel a strong taste;
e) The smell threshold of certain substances by humans is much higher than the concentration required by national occupational health standards.
When smelling pollutants, people have actually been exposed to
hazardous atmospheres or have been harmed;
f) Some harmful gases are odorless, such as carbo...

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