ISO 4433-1:1997 pdf download.Thermoplastics pipes一Resistance to liquid chemicals一Classification
1 Scope
1.1 This part of ISO 4433 specifies a method for carrying out a preliminary evaluation of the behaviour of therrnoplastics pipes in reLation to the liquid chemicals transported.
1.2 This method of classification provides Information on the suitability of pipes for transporting liquid chemicals in the absence of pressure or stresses such as earth loads, dynamic stresses and internal stresses.
1.3 A full procedure for carrying out the test is also reported in ISO 175. which is devoted to plastics in general, and r specd&ty to thermopiastics pipes.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 4433. At the time of publication, the editions indicated were valid. All standards are subject to revision. and parties to agreements based on this part of ISO 4433 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently vakd International Standards.
ISO 175:1981, Plastics — Determination of the effects of liquid chemicals. including water.
ISO 527-2:1993, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion plastics.
ISO 5893:1993, Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of traverse) — Description.
ISO 62592:_1), Ther,noplastics pipes — Determination of tensile properties — Part 2: Pipes made of unpiasticized poly(vinyl chloride) (PVC-U), chlorinated polyfrmnyl chloride) (PVC-C) and high-impact poly(vinyl chloride) (PVC-HI).
ISO 6259.3:_1). Therrnoplastics pipes — Determination of tensile properties Part 3: Polyole fin pipes.
3 Principle
3.1 Standard test pieces (of the type used for tensile tests一see figure 1) are taken from pipes, of wall thickness preferably between 1,8 mm and 3,2 mm, made from the material to be tested (see ISO 527-2).
3.2 The test pieces are completely immersed in the liquid chemical being used for the test.
3.3 The immersion periods are standardized and chosen according to the change in mass of the test pieces as a function of time, in particular to the state of saturation or equlibrium as indicated by a plateau in the curve of change in mass.
NOTE一Additional information is required when
一the pipes are permeable to the liquids transported;
一electrostatic surface charges present a risk (liquids with a flash point of less than 55 °C; the flash point can be determined by ISO 1516(1 or ISO 368012);
一the immersion liquid can produce particular effects, such as stress cracking phenomena, which this method does not cover.
4.1.1 When information is required on the behaviour of a thermoplastic pipe used to transport a specific liquid, this liquid shall normally be used.
4.1.2. The composition of industrial liquids is not, in general, absolutely constant; whenever possible, therefore, the test shall be carried out in defined chemical liquids used on their own or in mixtures, and so that it is as ;representative as possible of the action of the products in question.ISO 4433-1 pdf download.