OSHA 1910.119 (d)(3)(i)(B) states that P&IDs are Process Safety Information (PSI) documents that are required for Process Hazard Analysis (PHA). 


Since P&IDs must contain current process safety information, they are to be reviewed and updated any time part of a system is modified to assure that they reflect the current system(s) status, design, and installation.  Up to date P&IDs that accurately depict the current state of the process are required prior to development of the Process Hazard Analysis (PHA). 


A PHA is directed toward analyzing potential causes and consequences of fires, explosions, releases of toxic or flammable chemicals and major spills. The PHA focuses on equipment, instrumentation, utilities, human actions (routine and non-routine), and external factors that might impact the process. These considerations assist in determining the hazards and potential failure points or failure modes in a process.


PHAs are required by OSHA to be updated and reevaluated every 5 years after completion of the initial PHA so P&IDs must also be continually updated to reflect As Built (as is in the field) status.


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Text Box: P&IDs—From The Drafter’s Perspective
Guide To Drafting Piping and Instrumentation Diagrams

P&IDs are PSIs

P&IDs - From The Drafter’s Perspective—Guide for Drafting Piping and Instrumentation Diagrams

PSI and PHA Links


Process Safety Management | Process Safety Information 190.119


OSHA Directive CPL 03-00-010—Petroleum Refinery Process Safety Management National Emphasis Program |


Process Hazard Analysis | PSM Compliance |


Elements of Process Safety Management | Process Safety Management Guidelines for Compliance


Oil Refinery Definition  |  Chemical Plant  |  OSHA Technical Manual—Petroleum                                                                                 Refining Processes


Plant Layout—UK HSE  |   Encyclopedia and Occupational  |

                                                                                           Health and Safety—                                                                                                   Chemical Industries


P&ID Safety Features



Disclaimer:  The web has been scoured to provide as much information about P&IDs as possible on this site.  This information comes from many sources and many different countries.  Reviewing it all will increase a person’s knowledge but it is the reader’s responsibility to insure that the information contained herein is verified by proper authorities as valid for use in any intended application.

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