Project Closure Report - 40mm Serviflex - NIA_SGN0061

Abstract:

The objective of the 40mm Serviflex project is to prove the suitability of using a 40mm Serviflex pipe to renew 2" steel on Great Britain's (GB) gas network. The main application that this will be beneficial to is the replacement of the below ground approach mains for network risers.

SGN have almost 200 thousand network risers within multiple occupancy buildings throughout its Scotland and Southern networks. A common factor that results in risers being deemed unsuitable and subject to a full replacement is the deterioration of the below ground approach mains sections of risers, which are commonly found to be constructed from 2" steel. Serviflex is a corrugated dual wall liner manufactured by Radius Systems Ltd that when used with specialist installation equipment can negotiate tight bends without compromising its design life. SGN currently utilises the 20mm Serviflex pipe to renew gas mains services up to 1 ¼" back to the original meter position.

The use of 40mm Serviflex in riser repair applications will allow the partial repair and refurbishment of existing risers as opposed to the full replacement of them, resulting in reduced time required by SGN and minimising disruptions. It will also allow for these activities to be carried out with less disruption (excavations, lifting floor boards etc.) both within and out with consumers premises.

Project recommendations:

• Appendix A - Training presentation
• Appendix B - Trainers manual
• Appendix C - Training course test paper
• Appendix D - Course registers
• Appendix E - Draft GIS/PL5-1:2015
• Appendix F - SGN draft work instruction
• Appendix G - Field trial report
• Appendix H - Cost analysis from 'The Sunshine' pub Farlington
• Appendix I - Pipe sizing analysis

Publication Year:

2016

Publisher:

Ofgem

DOI:

No DOI minted

Author(s):

SGN