GRP Properties ( Stress Analysis) at elevated temperature

As per vendor data
Design Temperature is 65DegreeC.
Hoop tensile Modulus at 23degreeC = 20500MPa
Hoop tensile Modulus at 65degreeC = 18040MPa
Axial tensile modulus at 23degreeC = 12000MPa
Axial tensile modulus at 65 degreeC = 9600MPa

My querry to the forum is out of the above two figures which property to be used for the analysis temperature of 65DegreeC.
Ambient temperature is 23DereeC.

As per ASME B31.3/ASME 31.4 flexibility analysis sahll be carried out at 21C.Please guide for GRP stress analysis as per ISO14692-3.
Thanks & regards,

Hullo Danishbihar,

You need more input data from the vendor. If you are using version 5.20 then you will know exactly what you'll need for CII.

If you need to do an ISO 14692 calculation you need more input from the vendor. But be aware that a lot of vendors can't supply you with all the information needed because they have not established material properties in the way it's required for ISO14692.

Why are you checking ASME for temperatures when you're doing a ISO calculation? Check ISO and use common sense. Good luck with your calculations.

Danishbar,
I recommend you use the 23°C axial modulus for your pipe stress analysis calculations. This will ensure you do not understate thermal and other displacement-induced loads.
For other calculations, for which a lower modulus would be more conservative, you should use the values at the 65°C. This would apply to calculations such as displacement between pipe supports, and resistance to external pressure (or vacuum).