This past March there was a gas explosion in New York City. Many of you might remember this incident since it was in the national news. When the building exploded it caused eight deaths and dozens of injuries. The National Transportation Safety Board (NTSB) investigated and found issues with the way the installation company fused its poly joints. They found inadequate surface preparation or inadvertent contamination of plastic pipe surfaces prior to saddle fusion welding led to a joint with incomplete fusion; and a weld joint with incomplete fusion can be strong enough to pass initial pressure testing of the piping system but could eventually fail or leak after the joint is placed in service.
As a result of these findings the NTSB has issued an advisory bulleting to incorporate the guidance into your plastic fusion procedures and appropriate instructions to avoid similar incidents. The fusion procedures that IAMU gas members use do cover these procedures but it is an excellent reminder that you can’t take short cuts when preparing you pipe for fusion. Here is the advisory.