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May 17, 2018

Human error and Human factor incident

Reaction containing flammable mixture was completed. The batch was transferred to another kettle. Inerting was carried out. As soon as the nitrogen gas was admitted, an explosion took place in the system. Two operators were killed & five injured. Root Causes: Instead of inert gas, air was admitted, by mistake. There was no system to ensure the specific inert gas or air in the cylinder.


Courtesy: A.G.Shingore, National Safety Council
 

May 13, 2018

May 9, 2018

Interpreting Piping and Instrumentation Diagrams-Symbology

Interpreting Piping and Instrumentation Diagrams-Symbology: Get a thorough explanation of symbology as it relates to Piping and Instrumentation-controls symbology, tag identification, I/O devices, valve symbol, primary flow element, horizontal line types, dashes, and more. As I mentioned in Part 2, the meanings of the various symbols used on P&IDs (aka, symbology) are defined on separate drawings called “Lead Sheets” (or Legend Sheets). These are your “secret decoder rings” to P&ID symbology interpretation. Every company that builds process plants should have a set of lead sheets customized to their particular ways and means.