Abstract: This study considers the application of compressed natural gas stations and identification of risks associated with the storage of CNG and determining nearby land use limitations. In such cases the most important consideration is to be assured that the proposed site would not be incompatible with existing land uses in the vicinity. It is possible by the categorization of the estimated levels of Individual Risk (IR) which the proposed site would impose upon them. An analysis of the consequences and likelihood of credible accident scenarios coupled with acceptable risk criteria is then undertaken. This enables the IR aspects of the proposed site to be considered at an early stage to allow prompt responses or in the later stages to observe limitations. According to the results in many cases, not only required distances have not been provided but also CNG stations are commonly located in vicinity of populated areas to facilitate refuelling operations. This is chiefly because of inadequate risk assessment studies and ambiguities to define acceptable risk criteria. Natural gas is in priority because of the relative abundance, ease of use, less environmental pollution, and the price is cheaper than gasoline. Gas-powered cars and creates CNG fuelling stations at a rapid rate on the rise. This study was done to identify and determine the operational deviations in one of the CNG gas compressors and proposed hazard control measures. HAZOP study is done in order to risk analysis. Data gathered through visiting the work place, direct observation of the process, identify detailed components of gas compressor, interviews with staff and specialists, review procedures, operational instructions, and records of events and browse other technical information. Identification of possible causes of deviations in compressor performance and risk assessment was done in several meeting with cast HAZOP experienced experts. Seven operational deviations identified in the performance of the compressor used in CNG station includes no & less flow, more & less pressure, presence of compounds other than gas in compressor, reverse flow and more temperature. 41.34% of the risks were in acceptable range, and 58.66% was in conditionally acceptable. Prepare work instructions, worker education, fix and maintenance and regularly equipment calibration can be useful in prevention of accidents in CNG stations.

Keywords: compressed natural gas, risk assessment, HAZOP.

| DOI: 10.17148/IARJSET.2022.9578