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How to evacuate vapor from a pipline which is not full initially. AFT impulse

How to evacuate vapor from a pipline which is not full initially. AFT impulse

How to evacuate vapor from a pipline which is not full initially. AFT impulse

(OP)
thread408-218554: Modeling air valves in pump trip- emergency startup (sewage forcemain)

Hello,
I'm using AFT impulse for water hammer analysis. i have a pipline with no flow initially (valve closed)and i have notification that vapor exists in this pipeline in steady state and so, i cannot move to the transient analysis...what can i do?
This is what it look like: (image)
I want to use vacuum breaker valve but it doesen't work..maybe i don't modele it correctly?
Sincerly,

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