The quality of products according to GOST 15467-79 should be understood the totality of its properties, due to which it is able to satisfy, in accordance with its purpose, specific needs.
term "product" according to GOST R ISO 9000-08 (paragraph 3.4.2) is considered here as a result of the process is a collection of different activities interrelated and interact with each other and transform inputs into outputs (paragraph 3.4.1 of the guests).Thus, the determination of the quality of products must be carried out in areas of assessment:
- match the requirements (expectations or requirements, which are established and are binding or only assumed - definition from paragraph 3.1.2 of GOST 9000-08);
- ability to meet the needs, that is to define a set level or desired characteristics and its usefulness.
Section 4 of GOST 15467-79 establishes that the assessment of the quality of products must be carried out by applying the following methods:
- differential, based on the individual quality indicators, each of which describes one property of the product (for example, water hardness characterizes the salt content of Ca andMg, capable of forming deposits or scale in equipment);
- complex - using comprehensive quality metrics (eg, surface water 1st, 2nd, 3rd, 4th or 5th grade quality can inform that the water is conditionally clean, slightly polluted, contaminated,dirty or extremely dirty);
- mixed - evaluation is carried out using a single and comprehensive indicators (for surface water sources are regulated and individual indicators, such as stiffness, and complex - such as the quality class);
- statistics - applied mathematical statistics (the procedure used in the quality control of products regulated by a series of GOST R 50779).
checking the relevant statutory requirements carried out for each indicator of quality before sending the product to consumers.This procedure is called the acceptance for the external or internal functional control for the user.
volume control, including methods for evaluating the quality of products such as differential, complex or mixed, which conducted the tests prescribed in the technical specifications or contract (agreement).If the specification does not reflect the true quality requirements, it can not be guaranteed.For example, vessels working under high pressure, regulations should govern not only the material from which manufactured the device, its design and dimensions, but also operations such as manufacturing, installation, commissioning, technical diagnostics, maintenance and repair.That is all the requirements, mandatory compliance with which guarantees the reliability and safety of the vessels working under pressure.
ability (in accordance with its purpose) to meet the specific needs, you can see the example of the mandatory requirements for the quality of chemically treated water for steam generation.Such water in the technical documentation referred to as chemically treated (desalinated) or nutritional (for food enters the boilers in which steam is produced).
product quality assessment is carried out according to certain criteria: the requirements set depending on the steam parameters (low, medium or high pressure).For example, for boilers with a working pressure of 9 kgf / cm², 18 kgf / cm² and 50 kgf / cm², the rigidity of the feed water should be no higher than 70 mmol / kg, 15 mol / kg and 5 mol / kg, respectively.The compounds of copper, calculated as Cu, for the first two cases are not regulated, and for boilers with a working pressure of 50 kgf / cm² their content in the feed water should not exceed 20 mg / kg.
product quality assessment is carried out by competent laboratories, the general requirements which are established by GOST R ISO / IEC 17025-09.Standard specifies 15 requirements for quality management in the test or calibration laboratories and 10 technical requirements.Only when they are implementing laboratory may be certified under the current QMS in the organization or accredited by an independent body.The latter option is the confirmation of competence, of course, more significant.
management system refers to the structure of the organization, used to manage processes or activities that transform inputs of resources into a product or service, consistent with the objectives of the organization.For example, satisfaction with the quality of customer requirements, compliance with safety regulations or environmental objectives.
Assessment of the quality of products in many foreign firms takes place on the basis of statistical process control, based on the method of Six Sigma.For a statistically controlled processes likelihood of an unexpected failure is limited to six standard deviations from the normal distribution, that is, less than four billionths.The implementation of this method helps to ensure high and stable quality products.
