As mentioned in our last blog “choosing your thermowell” a thermowell will keep your temperature device protected. But, in some industrial processes the extreme environments that a standard thermowell is exposed can significantly decrease the thermowells lifespan, and can put your temperature device at risk. For example, in power station processes pulverized coal dust travels at high velocity. This causes the thermowell to erode and if not quickly replaced can expose the temperature device. In this situation you will need to have your thermowell stellite coated.
What is Stellite?
The alloy is a range of cobalt-chromium alloys designed for wear resistance. It is a trademarked name of the Kennametal Stellite company and was invented by Elwood Haynes in the early 1900’s as a substitute for cutlery that stained.
These alloys display, outstanding hardness and toughness and are noted for their high-temperature erosion resistance in a multitude of industries. Thermowells with a stellite coated weld overlay, have a longer life than regular thermowells. These are often used in Propane, Ethane cracking furnaces or in high velocity environments such as power stations. An Inconel thermowell is coated with usually around 4mm of stellite-6 material.
Using Stellite Coated Thermowells and D&N’s recommended maintenance procedures we have significantly increased our clients industrial thermowell life. This is why D&N Engineering Supplies is the trusted supplier of thermowells and temperature sensors to power stations within the Hunter region.
Are your thermowells experiencing shorter than expected life span due to erosion or high temperatures?
Contact our sales team and they will be happy assist you in finding the perfect thermowell for your industrial process.
D&N Engineering expertly craft thermowells in-house on our CNC lathes from a range of materials & can manufacture these from a supplied sample or sketch.