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Plastics piping systems for the trenchless replacement of underground pipeline networks — Part 2: Replacement off the line by horizontal directional drilling and impact moling
ISO 21225-2:2018 is applicable to polyethylene (PE) pipes and fittings, as manufactured, as well as to the installed replacement system.
ISO 21225-2:2018 is intended to be used in conjunction with StandardDetails applicable for the construction of PE pipeline systems where available.
Regarding manufactured pipes it is applicable to three different PE pipe types:
- PE solid wall single layered pipes (nominal outside diameter, dn), including any identification stripes;
- PE pipes with co-extruded layers on either or both the outside and inside of the pipe (total outside diameter, dn), as specified in Annex A, where all layers have the same MRS rating;
- PE pipes (outside diameter, dn) having a peelable, contiguous, thermoplastics additional layer on the outside of the pipe ("coated pipe"), see Annex A.
In addition, ISO 21225-2:2018 is applicable to:
- jointing of pipe lengths by means of butt fusion joint to form continuous strings prior to installation;
- fabricated and injection-moulded fittings made of PE.
Pipes made from other plastics, e.g. polypropylene (PP) are outside the scope of this document.
ISO 21225-2:2018 is not applicable to push-fit jointed discrete pipes assembled as part of the trenchless installation process.
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