GE9FA Gas purge line flow

Dear members while going through fuel gas purge line P& Id i got few doubts about the system which are as follows:
1. What is the purge air flow in these lines especially D5.
2. What will be the velocity of purge air to sweep the residual gas from the D5 manifold. Because of the high temperature of CPD sweeping the gas, is there any chance of self ignition.
Thank you all... in advance as its my first post in the forum.
 
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