BS EN 15655-2-2020 Ductile iron pipes, fittings and accessories一 Requirements and test methods for organic linings of ductile iron pipes and fittings Part 2: Thermoplastic Acid Modified Polyolefin (TMPO) lining of pipes.
4 Ordering information
The fllowing information shall be supplied by the purchaser to the manufacturer.
Ductile iron pipes according to EN 545, EN 598 or EN 969 but internally lined in accordance with this document shall be specified in the purchaser s enquiry and order by reference to this standard, e.g. 5 000 m of ductile iron pipe DN 300 according to EN 545, internal TMPO-lining according to EN 15655-2; or
– further information about use and handling. if needed.
General information on handling, transportation and storage to prevent damage to the TMPO lining is given in Annex C.
5 Technical requirements
5.1 Surface preparation
Surface preparation shall be designed in order to reach the required performances specified in this document. It is the responsibility of the manufacturer to demonstrate the fitness for purpose of surface preparation technology and to put in place a quality control procedure to ensure the stability of those performances (see 7.1.2).
5.2 Finished TMPO lining
5.2.1 Appearance and continuity
The TMPO lining shall be checked in accordance with 7.1.3 and be of: uniform colour, except the spigot end and the internal socket profile which may be of a different colour and/or different lining material;
一uniform appearance and smoothness except for admissible repairs;
一free of visible defects (pinholes, bubbles, blisters, wrinkles, cracks or voids).
Slight superficial variations of colour or billiance due to repairs or prolonged exposure to sunlight or contact with other pipes are permissible.
5.2.2 Minimum lining thickness
When measured in accordance with the method defined in Z.1.4, except on designated zones, the localized minimum thickness shall be greater than 300 um and the minimum average thickness shall be equal to or greater than 350 um. For designated zones (see 3.12), localized minimum thickness of 200 um is permissible.
5.3 Non-porosity
When tested in accordance with the test method described in 7.1.8 with a voltage of 1 500 V, the lined body of the component shall be free from porosity i.e. no electrical puncture shall occur. For potable water applications only, one electrical puncture per square meter is accepted.
In designated zones, electrical punctures are permitted.
Test frequency, see Table A.2.
NOTE Small oxide skin dust surface inclusions can generate electrical puncture by crossing the lining.
These inclusions are generally isolated in a sound lining. These kind inclusions will not be source of corrosion.
By statistical analysis of the occurring electrical punctures, the manufacturer demonstrates the puncture is associated to skin inclusions.
5.4 Pipe ends
Spigot end and internal socket profile (see Figure 1) should be coated with one of the following:
一TMPO in accordance with this document;
一epoxy lining in accordance with EN 14901-1;
一zinc or zinc alloy with finishing layer according to EN 545, EN 598 and EN 969, whichever standard is applicable;
一zinc-rich paint and epoxy.
NOTE Pipe ends are usually specified as designated zones.BS EN 15655-2 pdf download.