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5 RULE-5 Material Properties For Thermowell

The document outlines necessary material properties for designing a thermowell including modulus of elasticity, maximum working stress, fatigue endurance limit, and material density. It notes that material properties do not need to be known to better than 1% accuracy and any property value interpolations should follow manufacturer recommendations. Installation details require specifying the rotational stiffness of the thermowell support.

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Susheel Wankhede
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69 views1 page

5 RULE-5 Material Properties For Thermowell

The document outlines necessary material properties for designing a thermowell including modulus of elasticity, maximum working stress, fatigue endurance limit, and material density. It notes that material properties do not need to be known to better than 1% accuracy and any property value interpolations should follow manufacturer recommendations. Installation details require specifying the rotational stiffness of the thermowell support.

Uploaded by

Susheel Wankhede
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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5 RULE-5 MATERIAL PROPERTIES FOR THERMOWELL

    Necessary material properties of the thermowell include


    E modulus of elasticity at service temperature, Pa (psi)
    S maximum allowable working stress, Pa (psi)
    Sf fatigue endurance limit, in the high-cycle limit, Pa (psi)
    ρm mass density of the thermowell material, kg/m3 (lb/in.3)
  R5-1 Material properties do not need to be known to better than 1% of the property value for mass
  R5-2 Any interpolation of values in tables or figures should follow the methods recommended by the
  R5-3 Necessary properties of the temperature sensor installed in the thermowell include ρs = density
  R5-4 The temperature-sensor density enters into the calculations only as a small correction, and the
6 RULE-6 TEMPERATURE DEPENDENCE OF PROPERTIES
  R6-1 Evaluate the thermowell material density and all of the thermowell dimensions at ambient tem
  R6-2 Fluid properties, the elastic modulus of the thermowell material, and the stress- and fatigue-am
7 RULE-7 INSTALLATION DETAILS
  R7-1 Necessary details of the installation include
  R7-2 KM rotational stiffness of thermowell support, (N⋅m)/rad [(in.-lb)/rad]
  R7-3 See subsection 6-6 for additional information on the factor KM. Subsection 6-7 discusses determ
8 RULE-8 REYNOLDS AND STROUHAL NUMBERS
  R8-1 Calculate the Reynolds number and Strouhal number characterizing the fluid flow (para. 6-4.1).

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