RA333® Calciner Shell


Reaching temperatures of 900-938°C the catalyst for fluidized bed catalytic cracker units is created by calcining Kaolin clay.

Offering excellent high temperature oxidation, RA333® has been selected by a leading cat cracker catalyst producer to be used during the creation of their calciner shells.

Providing outstanding strength and thermal fatigue resistance RA333® replaced 601 units that had developed holes within the shell. Following the replacement of the 601 units the US company found there to be no more issues during the process.

### RA333® Offered Greater Fatigue Resistance

Calciner Shell

Originally the calciner shells were created using RA330®, but increases in operating temperatures required an alloy with greater strength and fatigue resistance. Which is why RA333® and 601 were both trialed before RA333® proved superior.

Bay Tank and Fabricating Company were selected to construct the three calciner units of RA333®. Using standard fabrication equipment and practices they were able to handle the RA333® fabrication with ease. They constructed the calciner units with a 5ft diameter, almost 36ft long and with an RA333® shell plate measuring 9.5mm that was welded over an internal RA333® square bar.

SMA Welding

**Plasma Cutter**Using titania electrodes, Bay Tank decided to use SMA welding. And to ensure crack free welds they opted to X-ray the welds after the cap pass had been applied.

Using standard equipment shearing and rolling of the RA333® alloy was achieved with great ease, whilst the RA333® and smaller pieces were cut using the latest plasma cutting equipment.

### Resistant to High Temperatures

Getting its name from its unique 3% molybdenum, 3% cobalt and 3% tungsten RA333® is also made up of 45% nickel and 25% chromium. It has outstanding resistance to high temperature oxidation and carburization, and has the ability to withstand thermal cycling and corrosive environments!

For more information regarding our RA333® alloys or any other alloys within our extensive inventory feel free to get in touch!

To learn more about RA333® contact us today!



Proud members of the British Valve & Actuator AssociationProud members of the British Valve & Actuator Association