Factor of safety for composite pressure vessel

[boeri]

I am designing a subsea composite pressure vessel (mainly loaded under external pressure). Can somebody provide me information about the factors of safety that need to be applied. I suppose it most be more than 1.5, due to the underwater environment and the unknown influences it can encounter. The purpose of the vessel is to deliver buoyancy in a range between 500 m and 3000 m below sea level.

Thank you in advance, it would be of great help.

 

[EdClymer]

Boeri

A composite shell requires careful design: particularly under external pressure. Shell length betwwen stiffeners is governing factor for resisting pressure - sort of holds the section circular.

In the Uk we use BS4994:87 and the MINIMUM K factor is 8 and frequently in the range 8-14.

Trust this is of help.

Regards

Ed

Ed Clymer
Resinfab & Associates
England

 

[saxon]

boeri, You may want to check the ASME Code for RP stamped vessels, Fiber Reinforced Plastic Pressure Vessels, Sec. X.

Hope this helps.
saxon

 

[boeri]

Thank you for the indication!
Wow, 8-14 seems a lot!!!!
I will surely check out the Codes...
Boeri