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NEERUVTI
Associate

Join Date: Sep 2007
Location: Panipat, Haryana
Posts: 36

Thermowell length

10/02/2009 11:59 PM

Please help me out to know the standard for calculating the thermowell length to be inserted in a pipe or vessel. Also what are collar type thermowells and how to calculate the themowell length for this case.

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 Neeruvti
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craigza
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South Africa - Member -

Join Date: Nov 2008
Location: Johannesburg
Posts: 295
Good Answers: 12
#1

Re: Thermowell length

10/06/2009 1:50 AM

Hi there,

The thermowell immersion depth (U) should be sufficient to eliminate conduction error. A general rule is to use an insertion length equaling a minimum of 10 times the diameter of the protection tube or well. Another rule of thumb is to have the sensitive portion of the sensor immersed to a depth of a minimum of 3 in. (75 mm) plus the length of the sensitive portion. In the case of expansion bulbs, the immersion depth may be specified by the supplier or can be indicated on a calibration report, if furnished.

Regards,

Craig
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