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We are operating 2-GE frame 6B dual fuel machines with DLN1. We are tripping flame (after 52G opens) because CPD drops below 50psi before 14hs clears. Found that we have a leak. Line running from CDP casing to the 3 transmitters has developed a leak. Impossible at this time to get to it so we are running an exterior line. Question: what is the purpose of the .03 orifice blow down on that line?