- Sensor and actor networks are used to monitor and control pipeline infrastructures. This paper discusses and compares different sensor and actor network architectures for water, gas, and oil pipeline infrastructures monitoring. These architectures are wired networks, wireless networks, separated wired and wireless networks, and integrated wired and wireless networks. The paper also discusses the reliability challenges and enhancement approaches for these network architectures. The reliability characteristics, advantages, and disadvantages among these architectures are discussed and compared. Three reliability factors are used for the discussion and comparison: the network connectivity, the continuity of power supply for the network, and network maintainability.