A Sensor Network is a real time network that is connected to critical environment also. The sensor network distributed in such area is having the criticality based on area constraints. As the nodes are defined with limited resources and in critical environment, the nodes can have some communication fault. To optimize the communication over the network, there is the requirement to perform a critical node safe routing over the network. The criticality of these routing algorithm increases, when the network is having such fault on area nodes instead of single node.