(47b) Minimizing Human Error in PHA Documentation | AIChE

(47b) Minimizing Human Error in PHA Documentation


Mukherjee, R. - Presenter, Risk Alive Analytics Inc
Li, C. - Presenter, Risk Alive Analytics
In Process Safety, the industry is well aware that humans can make errors. The industry is also aware that the more stressed and fatigued humans are, the more frequent they may make errors. Often times these characteristics impact the personnel involved in a PHA session, which means the documentation of a PHA can have errors as well. Many times Project or Plant driven PHAs have high expectations of scope completeness with lower allowance on time, leading to the feeling of a compressed PHA session. This pressure of time can lead to these normal human errors, which can unfortunately lead to critical documentation issues.

The errors of PHA documentation can range from:

Small impacts such as:

  • Spelling typos
  • Grammar/punctuation errors
  • Empty rows which may require document clean up

To larger impacts such as:

  • Unintentionally leaving high risk scenarios without follow up recommendations, thus leaving an unacceptable risk exposure at site.
  • Mismatches between the amount of safeguards applied for risk reduction versus the likelihood change recorded
  • Listing a unique safeguard multiple times in a scenario, artificially reducing the risk

Companies with a mature PHA process often have internal cycles of Quality Assurance to catch these types of issues and minimize any large impact errors. Unfortunately, these processes are often quite manual and rely on spot checks as people are not usually able to be allocated the amount of time required to check every row of data in a PHA. Even if a person was allotted reasonable time to review a PHA in its entirety, it is very unlikely that a person can catch all errors. If a PHA cannot be reviewed in its entirety after its completion, there will always be a chance that something critical can be missed.

Thankfully, as many of these Quality Assurance items have a repeatable logic based process when checking, many parts of this PHA QA cycle can be automated. This study shows the application of an automated PHA QA tooling process and real case examples of the time savings and high impactful items that can be flagged. The ideal goal is this process is to bring high impactful PHA Documentation errors to zero, thereby properly capturing the teams intent during the PHA Session, and ensuring the highest possible quality of this legal document of risk.


This paper has an Extended Abstract file available; you must purchase the conference proceedings to access it.


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