Our company recently needed to increase our thickness range for manually welding P1-P1. We used 1.5" thick SA-516 plate with a 37.5-10 degree compound bevel for the test coupon. The root passes were welded with ER70S-B2 using GTAW, 3/4" deposited metal thickness. The balance was welded with...
Our HRSG just recently experienced a perforated plate failure. Several sections of the perf plate broke off and damaged the front of the Reheater tube panels. We discovered flat spots and irregular surfaces as well as fin damage. One tube had a thicknesses of 0.116 and 0.119 and another...
The operating condition of the steam drains tank was predicted to be 220F @ 5 psi. The main steam drip leg drain operates at 1004F @ 1690 psi at the drip leg. The hot reheat steam operates at 1020F at the drip leg. The high energy lines are combined in a single 8" S80 P11 header and...
We have three carbon steel steam drains tanks at our combined cycle power plant. High energy drain lines are connected to the tank including main steam and hot reheat drains. The drains are attemperated before entering the tank. The tank is atmosperic and is designed for 800F at 50 psi. We...
We recently performed thermal imaging on the area around our HRSG inlet expansion joint. The exterior carbon steel casing adjacent to the expansion joint was 850F for about 2/3 around the 21' diameter duct. Several feet away from the expansion joint, the temperature was 135F. We are assuming...
A reference block, per Section V, was not manufactured to replicate the disimilar weld being tested. They did have a section of a failed flow nozzle and pipe from another plant. The UT tech picked up the defect but could not identify it. With the weld-in flow nozzle installed backwards, and...
Michael, our consulting engineer was using shearwave UT equipment. The transducers used for the shearwave test identified the suspect defect but were not able to positively identify if it was steam cut, crack, etc.
During shearwave testing a weld-in stainless steel flow nozzle in a 12" S160 P91 main steam line we identified a defect in the pipe upstream of the flow nozzle (which was installed backwards). The defect could not be charachterized with the shearwave equipment, but it appeared to be approx...
