We have recently had an incident in a turbine generator where an earth fault caused excessive damage to the stator and rotor. Melted copper was deposited on the outer surface of the 18Cr-18Mn coil retaining ring. Copper melts at 1085degC. I would expect that as the copper cooled, excessive...
What is the effect of hydrotesting a steel vessel to pressures ranging from 1,2 to 1,35 times the design pressure in terms of approaching or exceeding the yield strength? Can limited yielding be expected? If a vessel has been hydrotested to 1,35x design pressure at commissioning and then...
We are using backing rings in 304L piping where it is difficult to obtain a satisfactory purge. The service fluid is borated water at 25 deg Centigrade. The piping has proven to be extremely susceptible to SCC from external chloride contamination and high residual tensile stresses. Therefore...
