This paper presents a design architecture for wireless H2S remote monitoring system during the construction and drilling for Oil and Gas project. Because of the absence of wires and the nature of the construction activities while drilling (mobility of workers across the causeway is needed), the detection of the H2S gas needed to be mobile as well. Thus the wired solution was not possible except within the rig area’s sensor connectivity.  Furthermore, the perimeters mobile sensors units, stationed around the mobile workers, were designed to operate in pairs for redundancy across wireless connectivity to the rig, H2S sensor redundancy, and the redundancy for the solar panel, beacon and horn. The perimeters mobile sensors units contains horns and beacon to alert the associated work group of the presence of any level of H2S. To further improve the reliability and availability of the connectivity between the rigs and ECC, VSAT and WiMax links were operated in redundant mode to achieve higher availability. Moreover, each group of workers are given a private mobile radio to communicate to the ECC the status of the H2S should an alarm be generated. The private mobile radio provides a second tier of redundancy for communicating emergency information to the ECC. The same infrastructure can be reused for the pipelines system to support remote monitoring system for H2S and pipelines Gas leak detection, Cathodic protection monitoring system, wireless CCTV and remote motion detection system.