occur each year. Hazop study provide a safe system of work during inspection, maintenance operation especially in boilers,
through that work permit system formed to prevent the accident. When, in a workplace, a hazard has been identified and the
risk to health assessed, an appropriate prevention or control strategy is required. The fact that preparatory work is more
important than the work itself. Many times people get killed inside tanks and other confined spaces because of
misunderstandings like entering without permission to do some job or merely put their head inside to inspect the inside.
Through HAZOP study and work permit, accident can be prevented.