Questions about elastic modulus in CAESARII
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In the calculation of CAESARII version 4.4, only one elastic modulus in the cold state is used; there is no elastic modulus in the hot state available in the database at all. How is this resolved during calculation? Although it is possible to create one’s own data on the elastic modulus in the hot state, will the program perform the calculations? Fix: Version 5.0 has resolved this issue. Last edited by cls991 on 2008-1-13 16:10]
The CAESARII software uses the cold-state elastic modulus for calculating expansion stress, and it defaults to using this same cold-state elastic modulus when calculating OPE conditions. If you are using a version prior to 4.5, you need to use the thermal elastic modulus to calculate thrust and bending moment. Save another file, change the value of the elastic modulus, and use only the thermal elastic modulus in OPE conditions to calculate thrust and bending moment, for no other purposes.
If you wish to design your pipeline based on its elastic modulus in the hot state, you can use the following method: 1. Establish your analysis model as usual. 2. The software automatically recommends operating conditions, while new OPE conditions are added manually. L7 W+D1+P1+H OPE 3. Select the elastic modulus at high temperature in the operating condition selection field. The thrust-to-bending moment ratio in LOAD CASE Options, using condition 7 with the elastic modulus at operating temperature, is much lower than that in conditions using the elastic modulus at room temperature. 4. If you decide to use this method to design your high-temperature pipeline system and do not want to see the thermal thrust calculated based on the cold-state elastic modulus, you can hide the operating conditions for which such calculations are not desired in the operating condition selection interface.
It is safer and more appropriate to use the cold-state elastic modulus, as the temperature rise of high-temperature pipes occurs over a period of time.