ISO 10952 pdf download

ISO 10952 pdf download.Plastics piping systems – Glass-reinforced thermosetting plastics (GRP) pipes and fittings 1 Scope This standard specifies a method for determining the chemical resistance properties of glass- reinforced thermosetting plastics (GRP) pipes and fittings in a deflected condition for nominal sizes DN 100 and larger. In conjunction with IS0 10928 this standard provides a method for evaluating the effect of a chemical environment on the interior of a pipe or fitting after a specified period of time. This method shall also be used as the basis for conducting tests according to so called “specified levels” as allowed by referencing system standards. The specified level approach does not involve extrapolation of test data. NOTE I: It has been found that the effect of chemical environments can be accelerated using strain induced by deflection, hence it is frequently referred to as strain corrosion. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. For undated references the latest edition of the publication referred to applies. IS0 10928;1997, Plastics piping systems – Glass-reinforced thermosetting plastics (GRP) pipes and fittings – Methods for regression analysis and their use. 4 Principle The interior of a test piece is exposed to a corrosive test liquid at a specified temperature while being maintained in a fixed diametrically deflected condition. The test is repeated at several deflection levels, using a fresh test piece each time and recording the time to leak failure at each deflection. The results are used to calculate an extrapolated deflection value for a specified period of time. Alternatively the extrapolation can be performed using calculated or measured strains. Strain can be measured by the use of strain gauges. NOTE I: Use of strain allows fesfing using fesf pieces of variable fhickness and stiffness classes. Deflection and strain are inferrelafable by calculafion. NOTE 2: If is assumed that the following fesf parameters are set by the standard making reference to this standard: a) the composition of the test liquid (see clause 5); b) the number and length of test...