Development of a Dust Respirator by Improving the Half Mask Frame Design

Protective efficiency of filtering dust respirators depends on the properties of filter materials from which filters are made and the structure of a half mask frame, which influences how tightly the respirator fits the face. The conducted studies on the “Lepestok 40” dust respirator revealed a large air leakage through the gaps occurring along the obturation strip. Therefore, the purpose of the study is to develop a dust respirator to provide high level of protection and usability by improving the half mask frame design. A scheme for designing a dust respirator: analysis of operating conditions for the dust respirator; facial anthropometric measurements of potential users; designing a 3D model of half mask frame; laboratory testing of the protective properties of the product. A distinctive feature of this approach is considering the facial anthropometric dimensions of employees of a particular enterprise, standard sizes formation of 3D facial models, which is the basis for designing a half mask frame for dust respirator. A new half mask frame design for dust respirator with a variable geometry of fitting to the face surface has been developed, due to special attachment points that allow changing its size according to the anthropometric dimensions of user’s face.

Development of a methodology for assessing professional risks for a drilling enterprise

Introduction. The article discusses the problems of limited assessment of occupational risk using the existing Fine-Kinney method, which does not take into account the results of a special assessment of working conditions, therefore the authors propose an improved methodology for assessing occupational risk taking into account the working conditions indicator. Problem Statement. The purpose of this study is to analyze the existing methods of assessing professional risks, analyze the labor protection system at the drilling enterprise, and develop a methodology for assessing professional risks for the drilling enterprise. Theoretical Part. The existing methods for assessing professional risks and the enterprise standard were used as basic information. Conclusion. The improved technique will reduce the degree of risk, prevent accidents at work and generally be used at other enterprises.

Development and application of standard enterprise samples in the practice of analytical laboratories

The article presents the experience of development and application of enterprise standard samples (ESS) of monolithic and dispersed materials for spectral and chemical methods of steel analysis. The procedure for the development of ESS is described in detail: development of technical specifications for ESS in accordance with the requirements of GOST 8.315, preparation of ESS material, study of the uniformity of ESS material, establishment of metrological characteristics of ESS, preparation of a report on the development of ESS, verification of technical documentation for ESS and metrological examination of documentation, approval of ESS and its registration.

Issues of standardization of the methods of chemical analysis in metallurgy

The quality of chemical analysis is inextricably linked with such concepts as the methodology of analysis, unification, certification and standardization. In essence, a modern analysis technique is a type of software that allows quality control of the specific types of substances and materials in chemical composition. The methodology is a formalized regulatory document implemented at different levels — in the form of a certified procedure, in the form of an enterprise standard method, in the form of a unified industrial method, in the form of a national (state) and international standard. It is through the use of analysis techniques provides consumers, product manufacturers, and scientists with the most important information about the composition of a huge variety of substances and materials, the reliability of which allows their specific use and determines the cost of production. Therefore, the development and application of the methods need legal regulation both at the national and international levels. Features of standardization of analytical methods are considered in the case study of the quality control of metallurgical products.