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9 RULE-9 Natural Frequency at Operation Temperature: Steps

The document contains rules for analyzing the performance of a thermowell at operating conditions. It describes steps to calculate the natural frequency of the thermowell at operating temperature, determine if the natural frequency is suitable for the expected operating conditions, calculate steady-state and dynamic stresses, and check if stresses exceed fatigue limits. It also includes steps to calculate the pressure rating and check that it exceeds the design pressure.

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Susheel Wankhede
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59 views1 page

9 RULE-9 Natural Frequency at Operation Temperature: Steps

The document contains rules for analyzing the performance of a thermowell at operating conditions. It describes steps to calculate the natural frequency of the thermowell at operating temperature, determine if the natural frequency is suitable for the expected operating conditions, calculate steady-state and dynamic stresses, and check if stresses exceed fatigue limits. It also includes steps to calculate the pressure rating and check that it exceeds the design pressure.

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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  R8-2 Obtain the coefficients of lift and drag characterizing fluid forces on the thermowell (para. 6-4.

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9 RULE-9 NATURAL FREQUENCY AT OPERATION TEMPERATURE
    STEPS Calculate the natural frequency of the mounted thermowell at operation
  R9-1 Step 1. Calculate the approximate natural frequency.
  R9-2 Step 2. Use the correlations of subsection 6-5 to correct for deviations from the
  R9-3 Step 3. Correct for sensor and fluid mass.
  R9-4 Step 4. Correct for foundation compliance.
RULE-
10 NATURAL FREQUENCY AT EXPECTED MODE OF OPERATION
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  R10-1 Determine if the natural frequency of the mounted thermowell is sufficiently high for the expec
  R10-2 For the general case, this determination will require calculation of the maximum stresses, as de
RULE-
11 STEADY-STATE AND DYNAMIC STRESSES
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  R11-1 Calculate the maximum steady-state and dynamic stresses at the support plane of the thermow
  R11-2 For step-shank thermowells, repeat this calculation at the root of the reduced-diameter portion
RULE-
12 ALLOWABLE FATIGUE LIMITS
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  R12-1 Determine if the stresses exceed allowable fatigue limits (subsection 6-12).
RULE-
13 PRESSURE RATING
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  R13-1 Calculate the pressure rating of the thermowell, based on the pressure rating of the tip, thermo
  R13-2 Determine if the pressure rating exceeds the design pressure.

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