API 650 Storage Tank made from CFRP --- help calculating longitudinal compressive stress

[Zzelk]

Hi all

According to the API 650 E.6.2.2.3, the allowable longitudinal shell membrane compression stress
is Fc = 883*t/(2.5D)+7.5*sqrt(GH) (assume that GHD^2/t^2 <44)

It demands that this value is less than 0.5Fy.

What is Fy for CFRP?
Thanks!!

 

[Geoff13]

API 650 allowable stresses are for steel.

You will need to get all your allowable stresses (tension, compression, etc.) from a suitable CFRP design code.

 

[HTURKAK]

-Title of this thread (API 650 Storage Tank made from CFRP --- help calculating longitudinal compressive stress )..

API 650 section 4 defines the applicable materials and Annex S defines the applicable Stainless Steel materials. CFRP (carbon-fiber-reinforced plastic ) tank is not an API 650 tank.. Better to look AWWA D120 and D121 (Fiberglass Reinforced Plastic Tanks )


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This formula contains modulus of elasticity of STEEL . You can not use for CFRP tank..