【正文】 ........... 10 Light ageing......................................................................................................................................... 10 Materials in contact with water intended for human consumption ............................................... 11 7 Test Methods....................................................................................................................................... 11 Routine tests ....................................................................................................................................... 11 Performance tests............................................................................................................................... 12 Annex A (informative) Quality assurance ...................................................................................................... 15 General................................................................................................................................................. 15 Performance test。 b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. 5 BS EN 15655:2020 EN 15655:2020 (E) 1 Scope This European Standard defines the requirements and test methods applicable to factory applied internal polyurethane high duty corrosion protection of buried ductile iron pipes and fittings conforming to EN 545, EN 598 and EN 969 for use at permanent operating temperatures up to 45 176。s enquiry and order by reference to this standard, . ? 5 000 m of ductile iron pipe DN 300 according to EN 545, internal polyurethane lining according to EN 15655。C above the dew point. The surface shall be prepared by grinding (only for pipes) and grit blasting and be in pliance with level Sa of ISO 85011 when checked according to . The surface roughness Ra in accordance with ISO 85031 shall be at least 12,5 micrometers which is equivalent to an anchored profile Rz of 63 micrometers or higher if required by the lining material provider or manufacturer. Finished polyurethane lining Appearance and continuity The polyurethane lining shall be of: ? uniform colour, except the spigot end and the internal socket profile which may be of a different colour and different coating material。 ? free of visible defects (pinholes, bubbles, blisters, wrinkles, cracks or voids). 8 BS EN 15655:2020 EN 15655:2020 (E) Slight superficial variations of colour or brilliance due to repairs or prolonged exposure to sunlight or contact with other pipes are permissible. Minimum lining thickness When measured in accordance with , the lining thickness shall be as indicated in Table 1a for drinking water application and in Table 1b for waste water application. Table 1a — Lining thickness of pipes and fittings for drinking water transport according to EN 545 DN mean value x ?m (x2?) ?m 80 200 ? 1 300 ? 800 ? 200 ? 1 500 Table 1b — Lining thickness of pipes and fittings for waste water transport according to EN 598 DN mean value x ?m (x2?) ?m 80 200 ? 1 300 ? 800 250 700 ? 1 500 ? 800 700 – 1 000 ? 1 800 ? 1 000 ? 1 000 ? 2 000 ? 1 000 Pipe ends Spigot end and internal socket profile (see Figure 1) shall be coated with one of the following: ? epoxy lining in accordance with EN 14901。 ? bituminous paint (only for drinking water)。s written instructions. Marking All pipes shall be marked legibly and durably according to the pipe standard EN 545, EN 598 or EN 969. Reference to this standard shall be legibly and durably applied by any method upon the external surface. 9 BS EN 15655:2020 EN 15655:2020 (E) This shall be checked according to . Non porosity When tested in accordance with the test method described in with a tension of 3,0 kV for mean lining thickness up to 1 500 ?m and 4 kV for mean lining thickness greater than 1 500 ?m, the lining shall be free from porosity. Hardness When assessed by testing in accordance with , the hardness of the polyurethane lining shall be at minimum 70 Shore D. Testing temperature shall be within the range of 10 176。C. Adhesion The adhesion shall be at least 8 MPa when tested in accordance with . 6 Performance Requirements Chemical resistance The chemical resistance is determined by the change in weight of the polyurethane lining. When tested in accordance with , the weight increase resp. weight loss shall meet the requirements given in Table 2 when pared to the original weight. Table 2 — Weight changes requirements Property Unit Test method Clause Requirement Mass change after 100 days in deionised water at 50 176。C Mass change after subsequent drying % % Immersion test ISO 62, method 2 Less than 10 % weight increase Less than 4 % weight loss Indirect Impact strength Due to handling activities, the PUlined pipes may fall or get impacts from outside with minor plastic deformations which can cause damages on the lining. The minimum impact strength shall be determined in accordance with the test method defined in with an impact energy E of at least 50 joules. The lining shall subsequently show no damage when tested in accordance with . Resistance to ovalization When tested according to , the pipe shall ply with the requirements of and subsequently . 10 BS EN 15655:2020 EN 15655:2020 (E) Integrity under service conditions There shall be no detrimental damage to the polyurethane lining when the lined pipe is tested in accordance with and subjected to