BS ISO 17885:2021 pdf download.Plastics piping systems — Mechanical fittings for pressure piping systems — Specifications.
4 Manufacturers' declaration for the field of application The manufacturer shall declare, depending on the intended use, the medium supplied, the nominal pressure (PN), the pipe material(s) to be jointed, the use of a stiffener, the end load resistance class, the corrosion resistance, ash content for glass reinforced materials, installation and operating temperature limits, as applicable, of the mechanical fittings. This declaration shall be included in the product's technical file. For GAS applications, the nominal pressure is determined by the MOP declared by the manufacturer, multiplied by 1,6.
5 Material
5.1 General Mechanical fittings can be made entirely from plastic materials, from metals, or a combination of plastic materials and metals.
5.2 Plastic materials The compound/formulation used to manufacture any plastic components of the fitting exposed to weathering during storage and handling shall be weathering resistant. For longer use and operation, the component shall be protected. Pressure-bearing components shall be produced from virgin material, own reprocessable material or a combination of virgin and own reprocessable material. Recycled materials shall not be used. The same applies for glass-reinforced materials with a fibre length up to 3 mm. For glass-reinforced materials with glass fibres longer than 3 mm, only virgin materials shall be used. Table 1 lists components and fitting body materials in contact with the medium commonly used in practice for GAS, W, P and I. The suitability of the materials with “no experience” or other materials, which are not mentioned in Table 1, shall be demonstrated in agreement between the manufacturer and the end-user. The component and fitting body materials for IS depends on the medium supplied (see 8.4.3).
5.3 Metals For fittings made with metal components, these components should be made from one or more of the materials listed in Table 2. The materials should be corrosion resistant or should be protected against corrosion, according to their intended end-use conditions unless otherwise stated in the manufacturer's declaration (see Clause 4).
5.5 Lubricants and/or greases Lubricants and/or greases may be used to assist in joint assembly. The fitting manufacturer shall provide evidence that the lubricant and/or grease shall not have a deleterious effect on the performance of the component parts of the fitting likely to be in contact or of the connecting piping system. NOTE Requirements for GAS can be found in EN 377.
6 General characteristics
6.1 Appearance When viewed without magnification, the internal and external surfaces of fittings shall be smooth, clean and shall have no scoring, cavities and other surface defects to an extent that would prevent conformity to this document. No component of the fitting shall show any signs of damage, scratches, pitting, bubbles, blisters, inclusions or cracks to an extent that would prevent conformity of the fittings to the requirements of this document.BS ISO 17885 pdf download.