Is there any standard for thermowell insertion in pipeline and vessel?

 

believe the current standard is to do a stress calculation for the thermowell and insure that the thermowell is non-resonant for your flow conditions.

while it results is shorter thermowells than traditional selection rules, it is a safe selection.

you'll have to do a search on the ASME revised thermowell standard in the last year or so.

 

There's been a recent revision to ASME standard. The recently released PTC 19.3 revised a 35 year old standard that defines the criteria for designing thermowells for specific process conditions with a decided emphasis on safety.

For years, various US industries have relied on 3 different methods of determining the design of thermowells. The old standard had a limited 4 pages of thermowell design, whereas the new standard devotes more than 60 pages. It is likely that the newly revised ASME PTC 19.3 Standard will be the official worldwide standard.

JMS Southeast, a thermowell and sensor vendor, has an on-line spreadsheet, SwiftyCalc on their web site for performing thermowell process calculations.

http://www.jms-se.com/Apps/Tools/ThermowellDesign/Home.aspx