A caustic vessel 6mm thick (epoxy lined)remained in service for 40 years. 1.2mm uniform thickness loss was found in 2021 and two indications (cracks) were found in shell to shell weld. Vessel is originally not post heat treated.
I need suggestions for following maintenance activities;
1- Is it...
We have a CS 20"-12.7mm THk elbow installed on rich benfield solution. Operating Temp: 123.5 C while pressure: 29.5 Kg/cm2. Line is stress relieved as per process design conditions. Benfield CS lines are monitored against thickness loss. Particular elbow was found with multiple surface cracks on...
Some circuits at petrochemical plant are being monitored online against flow accelerated thickness loss. These circuits include BFW, HC, LC, Blow Down, Acid circuit and Benfield circuit etc. Please confirm the followings;
1- Recommended practices for inclusion/exclusion of certain fittings
2-...
Carbon steel (ASTM A106) was mistakenly installed on very high pressure steam piping (Pressure: 108 Kg/cm2 and temp: 495C) of a ammonia-urea fertilizer plant in 1979. As per design specifications, material of construction should be A335 P11. Now in August 2021, we faced creep rupture of the dia...
