Conducting Environmental Impact Assessment in Developing Countries (UNU, 1999, 375 pages): 9. Emerging developments in EIA: 9.4 Environmental risk assessments: 9.4.11 Guidelines for disaster management planning: 9.4.11.4 P & I diagrams

Conducting Environmental Impact Assessment in Developing Countries (UNU, 1999, 375 pages)

9. Emerging developments in EIA

9.4 Environmental risk assessments

9.4.11 Guidelines for disaster management planning

		(introduction...)
		9.4.11.1 Specification
		9.4.11.2 Plot plan
		9.4.11.3 Hazardous area classification
		9.4.11.4 P & I diagrams
		9.4.11.5 Storage of inflammable liquids
		9.4.11.6 Risk assessment

9.4.11.4 P & I diagrams

P & I diagrams are the documents which are prepared at the earliest stage of the design of a plant. It shows all the equipment in position, process and utility valves, instruments, control system, safety valves and other safety devices. After the zero revision, the P & I is reviewed in great detail taking all aspects into consideration, regarding safety of the plant under all eventualities. One of the methods used for the process may be a hazard and operability study (HAZOP study).