ISO 18225:2007
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Plastics piping systems Multilayer piping systems for outdoor gas installations Specifications for systems
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09-23-2021
English, Russian
10-22-2007
ISO 18225:2007 specifies general and performance requirements for multilayer pipe systems based on pipes made from thermoplastics and intended to be used for gas supply.
It gives requirements for the design of pipe systems consisting of multilayer pipes based on thermoplastics and for which at least 60 % of the wall thickness is of a polymeric material. The polymeric material used for stress design layers and all inner layers must be polyethylene (PE) and/or crosslinked polyethylene (PE-X), in accordance with Annex A. The outer layers of metal multilayer pipes must be of either PE or PE-X.
NOTE For the purposes of ISO 18225:2007, PE-RT is considered as PE, while (PEX) and adhesive layers are considered as thermoplastics materials.
ISO 18225:2007 is applicable to systems intended to be operated at temperatures ranging from -20 C to 40 C. It is applicable to pipes in these systems having a nominal diameter up to and including 630 mm, and to the supply of gaseous fuels of categories D (natural gas) and E (LPG vapour and natural gas or LPG vapour) (see ISO 13623).
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