stability check for offshore pipelines according to DNV RP F109

[mimouscha]

Hello,
Can anybody help me understand the symbols in the equations from the generalized lateral stability method of DNV RP F 109?
Actually not all of them exist in the section symbols of this revision practice, and here is the list of the symbols that I need to understand:
* Hs in the equation 3.7 of DNV RP F 109 how can we calculate it, actually that "gamma" is not found in the symbol part.
* Ly in the equation 3.35 is not found in the symbols parts and I actually want to determine Y from that equation, then Ly must be known however there is not any other equation or any other information about it.
Thank you for your help.

 

[lmtran4]

Hs is significant wave height for that region. In the gulf of mexico, this tends to be around Hmax/1.8 = Hs. Where Hmax is your maximum wave height.

If you actually have wave data, Hs is just the average of the highest third of your waves.

I have never used equation 3.35 and am not really familiar with it. So I can't really help you there.