1. PTT must be able to test piping at 150% of operating pressure.
2. Two reasons why PTT is used for testing the tightness of piping are:
3. Any contractor is allowed to perform PTT for the UST owner or operator.
4. The National Work Group on Leak Detection Evaluations (NWGLDE) provides information about
which methods of PTT have been reviewed, third-party tested and approved for use as a PTT