Translation:On Individual protective means for workers' respiratory organs (review of literature)

Abstract

The article covers topics of selecting and organizing the applications of individual protective means for respiratory organ in RF and abroad. The autors reviewed reccomendatins of the national autors on respiratory selection (over last 50 years) and demonstrated the inconsistency witw contemporary worldwide practice. Absent legal regulation of respirators selection and respiratory organ protective programms, lack of training programms and tutorals based on legislation requirements can be potentially harmful for workers' health. The autors therefore suggested ways to lower this potential harm, based on practice of selection and application of respiratory protection systems in foreign countries and on increased control over respirators certification and outdated model replacement.

Key words: individual protective means for respiratory organs, respirator, protection coefficients, legal regulation

Respiratory protective equipment (RPD) is one of the important parts of the industrial hygiene. Their use is explained primarily by the fact that in some cases, measures of engineering and technology and sanitary-technical nature are not able to reduce the concentration of harmful substances in the air in the breathing zone to acceptable levels, safe for health. In such circumstances, the value of the use of the respiratory protective equipment for protection of workers is difficult to overestimate.

In Western countries have developed respiratory protection program, which was based on the results of measurements of the effectiveness of respirators (conducted both in the laboratory and at workplaces). These programs are reflected in the sanitary legislation, which have state-wide application. Table 1 presents the documents adopted in several countries over the past decades, which define the requirements for such programs. It should be emphasized that the documents governing the execution of programs for respiratory protection in enterprises, based on the minimum technical requirements for respirators (as a stand-alone device) specified in the relevant standards. Such documents relating to the technical characteristics of respirators - RF GOSTs [6-9] - to a certain extent harmonized with the standards of the European Union (EU). However, state standards of the RF there is a serious drawback. For example, in the United States and China for the certification of respirators are selected such trial participants whose size and shape individuals cover a minimum of 95% of individuals of working people [42,43]. And the state standards of the RF require the opposite - the trial participants are selected so that their faces should correspond to the mask respirator in shape and size. It is not possible to sufficiently ensure the protection of numerous working groups, because the difference of the shape of the mask from the face contributes to the formation of gaps and the leakage of unfiltered air into in-mask space.

It should be emphasized that in contrast to countries where there are regulations that define the requirements for the selection of respirators while performing a respiratory protection program in the RF choice RPD is based on the recommendations of the individual authors and catalogues of manufacturers of respirators.



"-" - there is no information; fig. 1 - limits are shown in the Fig.1.

In Fig. 1 and in tables 2 and 3 lists recommendations from different years belonging to the same models of respirators - half-facepices, and table 4 – to a full-facepices masks. These tables use the term - expected protection factor (PF) [assigned protection factor (APF) - the multiplicity of reducing the harmful substances concentration in the in-mask space of the respirator to the concentration outside the mask, in the breathing zone] [33].

As one can see in the tables and Fig. 1, the expected value of the protection factors of different authors vary within wide limits: the half-facepiece masks with high efficiency filters - from ~12 to 1000, and full-facepiece masks of modern design - from 100 to 2000. It is important to emphasize that the recommendations (provided by these authors) based solely on the results of laboratory tests. And only in the works of B. M. Tyurikov and V. I. Gavrishuk (1983, 1988) presents the results of testing of respirators Kama, Lepestok-40 and RP-K in the workplace conditions. They show that the protection factors in such circumstances may be in the range of from 2.5 to 125. It should be noted that at the last exhibition for occupational health and safety (БИОТ) in December 2012 in Moscow, respirator’s manufacturers advertisements indicated protection factors equal to shown in Fig. 1. For example, a respirator "Lepestok-200" (ОАО «Кимрская фабрика им. Горького») aerosols “provides” a protection factor of 200, and a half-mask "ARTIX" (ОАО "АРТИ") - more than 5000.

Noteworthy is the fact that the documents regulating the implementation of the respiratory protection programs abroad, contain other values of the assigned protection factors for respirators similar types. In table. 5 summarizes the recommendations made in the National standard for respiratory protection (tab. 1), and guidelines for selection and use of respirators National Institute of occupational safety NIOSH (USA) [34,36]. These recommendations are based on the results of numerous estimates of the rates of workplace protection factors in workplace [40], who showed that respirator protection factors (average per shift) can vary within wide limits, decreasing in some cases, the half-facepiece masks to, for example, 2.2 (due to leakage of unfiltered air through the gaps between the mask and the face). The expected value of the protection factors of respirators, which in developed countries are used as criteria for the admissibility of application of RPD particular design (to protecl workers in known in workplace conditions) (tab. 5) take into account such reduction. Mentioned in this table, the expected protection factors show that for reliable protection of operating at high air pollution need respirators with forced air supply under the mask. The U.S. share of workers that make use of such respirators, exceeds 10% [38].

Thus, existing recommendations on selection of PPE for respiratory protection when working in a contaminated atmosphere in the RF carry some potential risks to the health of employees. It increases when taking into account the fact that in RF there are no legislative acts regulating individual selection of the mask with the verification of the correctness of the choice made with the help of instruments, and the system of learning the correct proper donning and use of PPE. It should be emphasized that unlike developed countries, where there is a wide free access to the academic literature (USA and others) [34,35], developed by experts on the basis of the requirements of national legislation in the Russian Federation there is no comparable textbooks.

“-“ - there is no information

Finally, for an effective respiratory protection is of great importance certification RPD used, the quality of which in RF requires major changes. The need for the latter can be justified by at least one example: "'Prodmashtest' issued the certificate of conformity № 0820927, who argues that filtering half mask "Lepestok-200", made by an individual entrepreneur Ivanchenko LV, complies to: GOST ГОСТ 12.4.189-99 [6] (EN 136), GOST ГОСТ 12.4.190-99 [7] (EN 140), GOST ГОСТ 12.4.191-99 [8] (EN 149) (although in violation of the standard the respirator is not marked), and even GOST ГОСТ 12.4.192-99 [9] (EN 405) at the same time. The issuance of such certificates greatly increases the degree of hazard for the workers, because it misleads the employer or whoever chooses the appropriate respirator for protection of workers in certain conditions of air pollution. It is necessary to stop the production of respirators that do not meet modern requirements for their quality.

For accurate and consistent implementation of the requirements of the standard for respiratory protection should also develop regulations governing the inspection of the implementation of the respiratory protection programs, similar to those used in the USA [37], and apply it during inspections [41].

Because there is a risk of a significant difference between the concentrations of harmful substances in the air of working zone and directly into the breathing zone of workers (about 40 times) [39], to clarify the degree of potential hazard conditions need to measure air pollution at workplaces only by means of individual samplers.

Conclusion: : in summary, it should be recognized that there are significant weaknesses in the practice of the use of respirators in the workplace in RF, evolving over decades. To reduce potential health hazards when working use of respirators, is necessary to develop sanitary and legislative documents regulating rules for the selection and use of respirators - that is, essentially, the documents governing the program respiratory protection in any enterprise in the RF.


 * 1) - Index “a” - on the aerosol; index “g” - gas, a+g - aerosol and gas
 * 2) - If a full face mask or half mask not only selected individually, but also checks the tightness of its fit to face (fit test)/
 * 3) - If the air is contaminated with oil mist or other aerosol, the capture of which would reduce the efficiency of electret filters, you must use filters or prefilters that maintains its performance in such conditions.

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