HRST can provide P91 and P22 Tee NDE Inspection with our CPS Inspection scope. In the event that crack indications are identified, our protocol includes providing comprehensive recommendations for monitoring or repair.

EPRI has issued an Immediate Action Notification to the energy sector highlighting the prevalence of inside diameter-initiated cracks and failures in seamless Grade 91 and Grade 22 tees. This has occurred within tees in High Energy Piping (HEP) systems, also referred to as Covered Piping Systems (CPS), with less than 100,000 hours of service.

Dozens of leaks have been reported in seamless tee intersections of high-energy piping systems, particularly in main steam or hot reheat systems, fabricated from grades 91 and 22 steel and operating for as little as 35,000 hours. The primary concern is the evolution of creep-dominated damage in various locations of the tee fittings. The impact of unexpected leaks can be significant, with potential costs exceeding $100,000 per replacement tee fitting and totaling around $20 million for a representative fleet of 20 combined cycle units which has identified approximately 160 at-risk tees (EPRI).

To address this issue, HRST has forged partnerships with reputable NDE inspection and material analysis firms to conduct a thorough Tee NDE inspection of wrought seamless Grade 91 and Grade 22 Tees, which are commonly utilized in ASTM A335 P91 and P22 piping systems.

Immediate action is recommended for high-energy piping systems operating above 1000°F, involving assessments with phased array ultrasonic procedures to detect potential cracking in welds and the tee crotch location.

Call us today to schedule a Seamless Tee NDE Inspection.