Tubular Thermowell

• A thermowell is simply a pocket into which a process temperature measuring device can be secured and removed/reinserted without interrupting the process and disturbing thew minimum of any insulating materials.
• Most of them are tubular, i.e. a cylinder with a closed end protruding into the process fluid at some point.
• And they can be used practically enywhere the mechanical and process arrangements will permit. Arrangements at T-pieces are particularly attractive in the case of small-diameter piping.

Dear PWSlack, good describing for thermowell,

But instead of all thermowells are produced in circular or tubular shape, but we don't used to specify them with tubular. It is the first time to me to read "Tubular Thermowell".

Here's lots of photos of different types.

http://www.omega.com/search/esearch.asp?start=0&perPage=10&summary=yes&sort=rank&search=THERMOWELL&submit=Search

I have an application that requires an inexpensive thermowell. I haven't found one. They are usually made of resistant stainless steel and precisely machine to protect the sensors against the process and fit tightly in the opening. This is overdone for my application. I simply need some closed tubing with a simple mounting to install my sensor in the airflow of my product. 6mm internal by 30-50mm long is good enough. Some type of threaded fastener would be useful. Quantity would be 50 to 100 at a time, once a year.

Try making one out of a brass screw, Something like a M12 X 40mm. Drill from the head down to 6mm from end. insert your sensor and epoxy seal the end.

We make large ones out of brass using hex stock, we thread them with a standard NPT die.

WE use ceramic (mullite) protection tubes. I get them here:

http://www.furnacepartsllc.com/prottube.html

A 24 in mullite tube is about 16.00USD, with threaded conector.

Their web site is not that good. You have to call them up, they will make up what you want.

I use a mullite 2 hole single bead (about $7.00 ea), for the thermocouple, inside the protection tube.

A tubular thermo-well does not have a closed end and therefore the temp devise cannot be changed on the run. I use tubular thermo wells made from 625 inconel to protect the RTD in pulp digester from the erosion associated with the process. I have them machined from solid 3" diameter inconel round bar with a 1-1/2" hole bored through and 1-1/4" threads on one end to except the RTD and smaller thermowell. I am not sure if you are talking about this type of thermowell or the closed ended ones that were mentioned earlier in the post. This is what we call a tubular thermo well at the paper mill.

pipewelder