All economic operations, including industrial activities, require requirements, the failure of any of which can lead to unintended consequences in the form of injuries to domestic and foreign customers, damage to production processes and products, environmental damage, damage to the reputation of organizations and others. Result in significant assets. In an organization with a preventive safety policy, the above requirements start from the pre-birth stage of the system, ie balance studies and the phase of ideas and thinking, and continue until the end of the phase of abandonment of the system (destruction or disposal phase). At the end of each stage, based on the continuous improvement approach and in order to improve the system and improve it based on the findings of evaluations, it is necessary to make a decision-making process based on the continuous improvement cycle of deming (planning, execution, control and execution). be placed.
HAZOP is a regular investigation into the dangers and problems that exist when operating the system. The first step in identifying hazards is to identify possible deviations from the original design. The next step is to examine the causes and consequences of these deviations.
Today, various methods and tools have been introduced for the analysis of process systems, each of which has its own capabilities and limitations. The selection of the appropriate technique is usually based on various factors, including the following:
– System type
– Depth of study
– Time frame
– Financial limitations
Existence of specialized forces
– Required accuracy
– similar items
The following are some of the common methods used to analyze process systems:
– What-If Analysis
– Check List
– What if / checklist
Although the HAZOP technique was first introduced and used to identify and assess process hazards (in 1970 in the United Kingdom), today, with the introduction and proof of its capabilities, the application of the technique has spread to other systems and industries. The word HAZOP stands for Hazard and Operability study.
Hazop technique is also defined as follows:
– The method of identifying and evaluating problems that can impose a risk on people, the environment or equipment or prevent the effectiveness of operations.
– It is a systematic and qualitative method based on the use of keywords.
– A creative way to solve problems with safety and operational roots, which is based on the activities of a multidisciplinary team.
– The technique of identifying, evaluating and controlling hazards is based on the attitude of a system that is based on the following principle:
The system is safe when all its operating parameters such as pressure, temperature, flow rate, etc. are in normal condition.
A systematic review by a team led by a trained leader will aim at designing a new or existing system or unit to identify hazards, malfunctions, or malfunctions of various components within a system and its consequences on the system and its environment. Was.