Can the HSE manager also perform the Roles of Project manager ? As at most points the roles cross each other responsibilities ?

Hazard is Inherent property of a substance or an occurrence which has potential to cause loss or damage property, person or environment.

Yes, HSE manager can perform the tasks of PM. It would be a additional advantage that he will be having an eye for the underlying hazards in job tasks. But the thing is, being an HSE guy if he is more inclined to nitty gritties of HSE, he might over look some important issues of project as a whole. So, being a PM with HSE background is itself is not a problem, the PM should appoint a seperate HSE for the project and leave the detailed work of HSE to him.