PHA-Process Hazard Analysis

Today, we will examine in brief what is referred to in industry parlance as PHA or Process Hazard Analysis. PHA refers to any technique that is used to identify hazards that may exist in any industrial, manufacturing or any such similar activity. More specifically it refers to the hazards that are to be identified in the process industry. As you know the "process industry" is a generic term that covers a wide range of industries such as chemicals, oil and gas, power generation, mining and the like. These industries have several hazards present due to the nature of their operations and they need to be identified, reduced to a safe enough level to minimize the risk of accidents and thus mitigate them. PHA thus refers to any technique that can reliably do so. There are several PHA techniques that are used in the process industry and they are HAZOP (Hazard and Operability Study), What-if analysis, HAZID, LOPA (Layer of Protection analysis) to name a few. Out of these HAZOP and LOPA are growing in popularity worldwide.LOPA as a PHA technique is also used as a SIL determination technique. SIL is an acronym for Safety Integrity Level and we will cover that in a separate post.