scope:

INTRODUCTION AND SCOPE

This Technical Note has been developed to summarize the historical work and knowledge behind the document that is currently referred to as "TR-33 Generic Butt Fusion Joining Procedure for Field Joining of Polyethylene Pipe" (Link). TR-33 has been relied upon as an industry reference and ultimately formed the basis for ASTM F2620. Recently, there has been an increase in the number of questions related to the testing (materials and participants), test results, and test methods that were used to develop the PPI TR-33 generic butt fusion joining procedures.