BS EN 1555-2:2021 pdf free download – Plastics piping systems for the supply of gaseous fuels – – Polyethylene (PE) Part 2: Pipes.
B.1 General
This Annex specifies the geometrical, mechanical and physical properties of those polyethylene (PE) pipes (outside diameter d) having a peelable, contiguous, thermoplastics layer on the outside of the pipe (coated pipe9. intended to be used for the supply of gaseous fuels. Marking requirements are also given.
The PE-material used for the production of the base pipe shall be in accordance with EN 1555-1 and the base pipe shall fulfil all the requirements of EN 1555-2 after removal of the peelable layer with the exception of appearance. colour and marking.
The external coating shall be manufactured from a thermoplastic material. When attached, the coating shall not affect the ability of the PE pipe to meet the performance requirements of this document.
If an adhesive layer is used to attach the peelable layer, it shall be easily removed, and without affecting the jointing process. The preparation for the joining process shall follow normal procedures.
NOTE Other types of layered pipes are covered by other standards e.g. ISO 17484-1 (6J or ISO 18225 (7j.
8.2 Geometrical characteristics
The geometrIcal characteristics of the pipe, with the coating removed, shall be In accordance with Clause 7.
B.3 Mechanical characteristics
The coating shall not have a detrimental effect on the pipe or vice versa. The mechanical characteristics of the pipe, with the coating removed shall be in accordance with Clause 8, and the attachment of the coating shall not affect the ability of the pipe to conform to those requirements. Requirements for colour are given in 6.2.
When the pipe is tested with the coating attached, conformity with Clause 8 before and after weathering according to EN 1555-1:2021, Table 2 shall be assessed with the exception of a black base pipe. The conditions selected shall ensure that pipe is subjected to the specified test stresses.
8.4 Physical characteristics
The physical characteristics ol the pipe, with the coating removed, shall be in accordance with Clause 9.
B.5 Coating adhesion
The coating shall be resistant to detachment during storage and installation.
The coating shall be manually removable prior to jointing using simple tools.
B.6 Marking
Marking shall be applied to the coating and shall be in accordance with Clause 11.
In addition, the coating shall be provided with marking clearly distinguishing the pipe from non-coated pipe in service, for example identification stripes may be used for this purpose.
The coating shall also carry marking that warns that the coating shall be removed prior to electrofusion, butt fusion and mechanical Jointing.
When possible, the base pipe may be marked in accordance with Clause 11.