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PPI TN-20

2016 Edition, 2016

Complete Document

Special Precautions for Fusing Saddle Fittings to Live PE Fuel Gas Mains Pressurized on the Basis of a 0.40 Design Factor



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Product Details:

  • Revision: 2016 Edition, 2016
  • Published Date: January 2016
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Plastics Pipe Institute (PPI)
  • Page Count: 6
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

Foreword

SPECIAL PRECAUTIONS FOR FUSING SADDLE FITTINGS TO LIVE PE FUEL GAS MAINS PRESSURIZED ON THE BASIS OF A 0.40 DESIGN FACTOR

This report was developed and published with the technical help and financial support of the members of the PPI (Plastic Pipe Institute). The members have shown their interest in quality products by assisting independent standards-making and user organizations in the development of standards, and also by developing reports on an industry-wide basis to help engineers, code officials, and users.

Recent changes to the gas system codes in Canada have increased the maximum operating pressure (MOP) for gas service. In the United States, substantial investigation has been undertaken to explore the installation and operations considerations of moving to a higher design factor. Six special permits (waivers) allowing for systems to be installed and operated with a 0.40 design factor (DF) have been granted. Based on these installations, the American Gas Association Plastic Materials Committee (AGA-PMC) has submitted a petition to the US Department of Transportation (DOT) Pipeline and Hazardous Materials Safety Administration (PHMSA) to increase the design factor for high performance PE materials to 0.40.

The internal pressure capability of polyethylene gas piping products is not at issue because the increased MOP is well within the long-term internal pressure design capabilities of materials used for polyethylene gas piping today with a 0.40 design factor. However, higher internal pressure signifies the need for more careful attention to the process of fusing service and branch saddles and self-tapping tees to the live PE mains. This PPI Technical Note addresses precautions that should be considered relative to this issue.

This report has been prepared by PPI as a service to the industry. The information in this report is offered in good faith and believed to be accurate at the time of its preparation, but is offered “as is” without any express or implied warranty, including WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Any reference to testing of a particular proprietary product should not be construed as an endorsement by PPI who does not endorse the proprietary products or processes of any manufacturer. The information in this report is offered for consideration by industry members in fulfilling their own compliance responsibilities. PPI assumes no responsibility for compliance with applicable laws and regulations.

PPI intends to revise this report from time to time, in response to comments and suggestions from users of this note. Please send suggestions for improvements to PPI. Information on other publications can be obtained by contacting PPI directly or visiting the web site.