References
- ‘Fire safety standards for the transport, distribution, storage and use of natural gas of density exceeding 0.8’ Ministerial Decree of 24 November 1984, Official Gazette of the Italian Republic, 15 January 1985
- ‘Recommendations on the installation of polyethylene (PE 50) pipes in the construction of underground pipelines for gas transportation (according to the directives of the M D of 24 November 1984).’ IPI Publications No. 7 – February 1985
- ‘Polyethylene (PE 50) pipes for underground pipelines for gas transportation – types, dimensions and requirements.’ UNI 7614
- ‘High density polyethylene pipes – test methods.’ UNI 7615
- ‘High density polyethylene fittings for pressurised fluid pipelines – test methods.’ UNI 7616
- ‘Polyethylene (PE 50) fittings weldable by fusion by heating elements, for gas transportation pipelines – types, dimensions and requirements.’ UNI 8849 (in preparation)
- ‘Polyethylene (PE 50) fittings for electrofusion at safety voltage, for underground gas transportation pipelines – types, dimensions, and requirements.’ UNI 8850 (in preparation)
- ‘Procedure qualification for welding of hd PE pipe.’ Prepared by the Dutch Institute of Welding (Doc. 11W/XV1–171–71E)
- November 1975 . ‘Testing of components and structures made from thermoplastics.’ November , DVS 2206
- Wolters , M and Venema , B . ‘Butt welding of polyethylene pipes.’ , Vega-Gasinstituut .
- May 1986 . ‘Classification and qualification of welders of plastics. Welders with processes with thermal contact elements, with mechanical equipment and with electrofusion for polyethylene (PE 50) pipes between 3 and 37mm thick and of diameter not exceeding 630mm for gas transportation.’ May , Technical recommendation IIS-RT 3–86/ UNIPLAST draft standard 525
- ‘Testing of welders for welding plastics – Test group 1.’ Direction DVS 2212. Part 1. (Doc. IIW/XVI-425–83)
- ‘Plastics – thermal element welding. General instructions.’ UNI 8542