Page 189 - Pipelines and Risers

162 Chapter I I

4tc3
a=- (11.7)
9Ec2

and
(11.8)

and the indentation curve (6, - F curve) for the insulation coating:

For Case 1:

(11.9)

and for Case 2:

SC=(-$) F ( 1 1.10)

Through finite element simulation, it will be possible to know the indentation of coating
S-ti,,. In such cases, energy actually absorbed by the coating is:

For Case 1:

(11.11)

and for Case 2:

(1 1.12)

The safety factor in the design of coating energy absorption capacity may then be calculated
as:

Safety Factor = - (1 1.13)
EC
ECwring

We may get for Case 1 :