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QUOTE=Canoeboy;208748]Did you read the correct column as the figure I have is different ?

I may have missed something but I hope the attached is correct and answers your question.


View attachment armour.pdf
 
Last edited:
QUOTE=Canoeboy;208748]Did you read the correct column as the figure I have is different ?

I may have missed something but I hope the attached is correct and answers your question.


View attachment 3307

You haven't missed anything as such but the table only indicates a non-compliance with table 54.7 whereby you can then use the adiabatic equation to size your cpc which invariably results in a lower required CSA by calculation.
 
You haven't missed anything as such but the table only indicates a non-compliance with table 54.7 whereby you can then use the adiabatic equation to size your cpc which invariably results in a lower required CSA by calculation.

Yes you can use the adiabatic equation but I was asked where my figure of 49.74 came from. The table will not give the most economical solution in all cases but it is an easy reference chart and always works on the side of caution. This means that at least your CPC will not be undersized. You would still be advised to use the equation to check though.
 

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