In richFaces I'd put scope request in managed bean and add keepAlive in each page fragments, but primefaces don't have keepAlive. I would want to kill session in view scope when I navigate in other fragment.
Your question makes absolutely no sense. No, you don't want to kill a session. Why don't you go figure out what the session really is so you stop using wrong terminology, and then go figure out what you are talking about so you can ask a question that does make sense.