GB 30864-2014Respiratory protection-Powered air-purifying respirator (English PDF)

5.3 Loose-fitting Facepiece and Loose-Fitting Hood

5.3.1 General Requirements Product design shall meet the following requirements:

a) Where facepiece or hood doesn't contain fan component, the filter element cannot be directly connected with facepiece or hood. It is checked according to the method in 6.2;

b) The facepiece or hood shall be equipped with facepiece or hood as required so as to be fixed on body; its design and composition shall provide proper fastening strength and shall be adjustable or have certain flexibility so as to be suitable for head-form and body type within certain range. It is assessed in 6.19;

c) If the product is claimed to have additional protective functions for eyes, face and head beyond this standard (e.g., protection against mechanical shock or non-ionizing radiation, etc.), such additional functions shall not interfere the respiratory protection performance specified in this standard. It is assessed in 6.19.

5.3.2 Safety helmet function If the facepiece or hood is claimed to have safety helmet function, it shall meet the requirements of impact absorption performance (4.2.1), penetration resistance performance (4.2.2) and chin strap strength (4.2.3) in GB 2811-2007. If used in flammable and explosive environment, the safety helmet should comply with the requirements of

a) Where tested according to the method in 6.5.2, the peak inhalation resistance of PAPR under power-off state shall not exceed 1100Pa;

b) Where tested according to the method in 6.5.3, the peak inhalation resistance of PAPR under power-on state shall not exceed 350Pa;

c) Where tested according to the method in 6.5.4, the peak inhalation resistance of PAPR under power-on state shall not exceed 700Pa.

5.5.2 PAPR with loose-fitting facepiece and loose-fitting hood Where tested according to the method in 6.5.5, the positive pressure in facepiece or hood shall not exceed 500Pa.

5.6 Visor

5.6.1 Visual field Where tested according to the method in 6.6, the tight-fitting facepiece shall meet the requirements of 5.1.7, GB 2890-2009; the total visual field of loose-fitting facepiece and loose-fitting hood shall not be less than 70%. Where there are various sizes of facepiece or hood, each size shall meet this requirement. This requirement is not applicable to the facepiece or hood claimed to have welding protection function.

5.6.2 Mechanical strength of visor Where tested according to the method in 6.7, the visor shall be free from any form of damage, and the facepiece or hood after test shall also meet the requirements of 5.7.

5.6.3 Prevention against high-speed particle impact If PAPR facepiece or hood is claimed to have prevention performance against high-speed particle impact, it shall meet the technical requirements for visor in 5.11, GB 14866-2006. The facepiece or hood after test shall also meet the requirements of 5.7.

5.6.4 Special requirements for welding protection If PAPR facepiece or hood is claimed to have welding protection function, it shall not only meet the applicable requirements in 5.1,

5.3 of this standard, but also comply with the following requirements:

a) As for the non-automatic dimmer welding filter glass, its length shall not be less

5.8 Breathing Hose

5.8.1 As tested according to the method in 6.9, the peak inhalation resistance of PAPR with tight-fitting facepiece shall not exceed 350Pa prior to imposing pressure; after imposing pressure, the change value of peak inhalation resistance shall not exceed 50Pa; as for the PAPR with loose-fitting facepiece or loose-fitting hood, the decrease of flow rate under pressure shall not exceed 5% of the MMDF value; where checked 5min after the elimination of pressure according to the method in 6.2, the breathing hose shall be free from deformation.

5.8.2 Where tested according to the method in 6.19, the breathing hose shall not restrict the free movement of the wearer's head, and shall meet the requirements of GB/T 23465-2009.

5.9 Dead Space Where tested according to the method in 6.10, the volume fraction of average carbon dioxide content in inhaled air of PAPR with tight-fitting facepiece under power-on state shall not exceed 1%, while that under power-off state shall not exceed 2%; the volume fraction of average carbon dioxide content in inhaled air of PAPR with loose-fitting facepiece and loose-fitting hood under power-on state shall not exceed 1%.

5.10 Filter Element

5.10.1 Basic requirements Where checked according to the method in 6.2, the design and material of filter element shall meet the following requirements:

a) The design of gas and/or vapor filter element shall not allow for refilling of adsorbent;

b) Replacement shall be carried out without special tools;

c) The part preventing particles of combination filter element shall be located in the air inflow direction;

d) After the pretreatment specified in 6.3.2, it shall be free from mechanical damage and meet the requirements of

5.10.2 and (or) 5.10.3.

5.10.2 Particle filter efficiency According to the method in 6.11, conduct the test with oily particle. The filter efficiency of Grade P95 particle filter element and combination filter element shall not be less than

5.14 Checking Device

5.14.1 Where checked according to the method in 6.2, each set of PAPR shall include checking device to check whether PAPR reaches MMDF.

5.14.2 Where the checking device displays that the air supply volume of PAPR is acceptable, the actual flow rate shall not be lower than MMDF, after the test of actual flow rate according to 6.4, confirm whether the checking device is in accurate and reliable display according to the application method of checking device.

5.15 Warning Device PAPR should be equipped with warning device. If PAPR is equipped with warning device, carry out checking according to the method in 6.2, during application process, the warning message shall not be closed and shall be sensed by the wearer, and the method for wearer checking whether the warning device is normal shall be provided. Where tested according to the method in 6.19, it is confirmed that the warning device may be checked. See Annex B for the warning function of PAPR.

5.16 Intrinsic Safety and Electrical Part PAPR shall meet the following requirements:

a) Where tested according to the method in 6.19, it is confirmed that the design of PAPR electrical part will not restrict the air flow properly or make the air flow backflow;

b) If it is declared that PAPR is provided with intrinsic safety in flammable and combustible environment, the intrinsic safety of its integral and electrical part shall meet the requirements of GB 3836.1-2010 and GB 3836.4-2010;

c) It is declared that PAPR can be used in explosive dust site, the intrinsic safety of its integral and electrical part shall also meet the requirements of Protection by Intrinsic Safety "iD" in GB 12476.4-2010 or Protection by Enclosures "tD" in IEC 61241-1:2004;

d) Where checked according to the method in 6.2, the battery adopted shall be of fluid type and not be of overflow type;

e) Where tested according to the method in 6.19, the battery adopted shall be

5.20 Information to be Provided by the Manufacturer

5.20.1 Complete set of respirator Where checked according to the method in 6.2, each set of respirator shall be provided with Chinese instructions to make the trained personnel master correct use method. The contents of selection, use and maintenance of relevant product shall be consistent with the relevant requirements of GB/T 18664-2002 and shall at least include the following information:

a) Application scope and restriction;

b) Type of PAPR (see Table 1);

c) Information on correct wearing, use, maintenance, charging (if applicable) and storage, recommended use temperature and storage temperature as well as humidity range.

d) Explanation about the allowed filter elements and their combined components in detail and that of the corresponding PAPR type.

Note: the use of illustration, component No. and label may assist explanation.

e) Detailed suggestions for use and replacement of filter element;

f) The filter element shall be disposable where used for CO protection;

g) The product shall be provided with the contact information of the manufacturer or its designated service provider to help the user understand other information in the specific environment, e.g. suggestions about the applicability of filter element of certain type;

h) Corresponding instruction shall be provided where there is end-of-service-life indicator;

i) The manufacturer's design duration under the state where the battery is used by matching with different types of PAPR (if applicable);

j) Where the battery and air supply fan are dismountable, the manufacturer's design duration information of battery shall be indicated on the battery body;

k) Where the battery and air supply fan are designed as a whole, the manufacturer's design duration information of battery shall be indicated on the air supply fan;

d) Warning provided for possible wrong use.

6.1 Samples and Ambient Conditions of Test

6.1.1 Test samples Unless otherwise specified, all tests for complete set of PAPR need two sets of samples, one is the received sample while the other is the pretreated sample. Where there are different sizes of facepiece or hood, at least 1 sample of each size shall be provided. Unless otherwise specified, the filter element tested together with PAPR is the received sample.

Note: see Annex D to understand the sample information required by each test method.

6.1.2 Ambient conditions of test Unless otherwise specified, the test shall be conducted under the following ambient conditions:

a) Temperature range: 16~32°C;

b) Relative humidity range: 20~80%. According to the requirements of Annex B, GB 2626-2006, the main dimensions of test head models are classified into three sizes - large, medium and small.

6.2 Visual Checking Visual checking includes checking for PAPR integrity, information provided by the manufacturer and identification. According to technical requirements, visual appearance checking shall be conducted for the sample prior to the performance test in the laboratory, and the result shall be reported.

6.3 Pretreatment

6.3.1 Temperature and humidity pretreatment of a complete set of respirator Place the complete set of respirator under the minimum temperature and minimum humidity condition noted in the information provided by manufacturer for (72±1)h, make it Where the initial actual flow rate is less than MMDF, stop the test. During test, the checking device shall be verified to see whether it's able to indicate MMDF condition correctly and report the result.

6.4.5 Manufacturer's design duration After the initial actual flow rate is tested, the test device shall be dismantled and the tested sample be kept in working state; at 1h before manufacturer's design duration, install the test system again for retest and test the flow rate according to the methods in 6.4.4. The total test time means the test period from initial actual flow rate to final actual flow rate, which shall not be less than the manufacturer's design duration.

6.5 Respiratory Resistance

6.5.1 Test devices Test devices include:

a) Breathing machine: with breathing rate range of 10~40 times/min and tidal volume regulating range of 1.0~3.0L;

b) Flowmeter: with measuring range of 0~500L/min and precision of 3%;

c) Differential pressure gauge: with measuring range of at least 0~1500Pa and precision of 1Pa;

d) Test head model: with breathing hose at opening;

e) Air pump: with pumping flow rate not less than 100L/min.

6.5.2 Inhalation resistance of PAPR with tight-fitting facepiece under power-off state Put the facepiece on a test head model with appropriate size, adjust the respiratory rate of breathing machine to be 20 times/min and tidal volume be 1.5L with fully charged battery and clean filter element under power-off state, and then test the peak static pressure (Pa) near the mouth and nose as well as that in inhalation. Test all filter elements, which shall meet the requirements.

6.5.3 Inhalation resistance of PAPR with tight-fitting facepiece under power-on state respiratory area of respirator, and then obtain the inward leakage of respirator through calculation. During the test, the reduced reagent concentration caused by filtration of tested sample shall not affect the precision of test and shall maintain the reagent concentration in test environment within the specified range.

6.8.4 Test devices and conditions Sodium chloride or oily particle shall be adopted for test, and the test devices and conditions shall meet the requirements of 6.4.2, GB 2626-20006.

6.8.5 Test procedures Adjust the flow rate of sampling tube on facepiece with flow rate control device to control the flow rate within 1~2L/min. Inform the examinees that they are allowed to adjust hood and facepiece during the test, but such action is required to be retested; the examinees shall not know test result during the test. Introduce the particles for test into the testing cabin and make their concentration meet the requirement. The examinee properly wears the tested respirator in clean air zone, and conduct tight-fitting checking for tight-fitting facepiece under power-off state. After passing the checking, connect the sampling tube to test instrument, test the background concentration in facepiece or hood outside of the testing bin when the examinee respires, determine 5 data and take the arithmetic average as the background concentration ca. Where the examinee cannot realize tight fitting with the facepiece, the test shall be stopped. Record the facial form of examinee, replace him/her and note such information in report. Order the examinee to enter into the testing bin and connect the sampling tube to the particle tester without particle contamination and ensure its air tightness; after concentration of test medium in the testing bin is stable, complete the following actions in sequence.

a) Keep the head still and quiet for 2min;

b) Turn the head left and right (about 15 times/min, like checking the left and right sides of wall in laneway) for 2min;

c) Look up/down (about 15 times/min) for 2min; Keys: 1 -- movable disc; 2 -- breathing hose. Figure 6 -- Schematic Diagram for Test Device of Compression Resistance of Breathing Hose

6.9.2 Test method of PAPR with tight-fitting facepiece Adjust PAPR till it meets MMDF condition, start fan, and test the peak inhalation resistance according to the methods in 6.5.3; place the breathing hose in the middle of two discs, apply 50N pressure (including the deadweight of upper disc) to the breathing hose, and test the peak inhalation resistance again according to the methods in 6.5.3. Where there are multiple breathing hoses, each breathing hose shall be tested and bear 50N load. Record the peak and change value of inhalation resistance after loading.

6.10 Dead Space

6.10.1 Sample quantity One sample received, or one sample received of each size (if applicable).

6.10.2 Test device The same as 6.9.2, GB 2626-2006.

6.10.3 Test conditions As for the positive pressure PAPR with tight-fitting facepiece, the test flow rate is relevant to the product and the peak interactive flow rate OP which is determined according to the methods in

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