2.2 Process Safety Information
29 CFR 1910.119 (d)
In accordance with the schedule set forth in paragraph (e)(1), the employer shall complete a compilation
of written process safety information before conducting any process hazard analysis required by the
standard. The compilation of written process safety information is to enable the employer and the
employees involved in operating the process to identify and understand the hazards posed by those
processes involving highly hazardous chemicals. This process safety information shall include
information pertaining to the hazards of the highly hazardous chemicals used or produced by the
process, information pertaining to the technology of the process, and information pertaining to the
equipment in the process.
Information pertaining to the hazards of the highly hazardous chemicals in the process. This information
shall consist of at least the following:
Permissible exposure limits;
Thermal and chemical stability data; and
Hazardous effects of inadvertent mixing of different materials that could foreseeably occur.
Material Safety Data Sheets meeting the requirements of 29 CFR 1910.1200(g) may be used to comply
with this requirement to the extent they contain the information required by this subparagraph.
Information pertaining to the technology of the process.
Information concerning the technology of the process shall include at least the following:
A block flow diagram or simplified process flow diagram (see Appendix B to this
(B) Process chemistry;
Maximum intended inventory;
(D) Safe upper and lower limits for such items as temperatures, pressures, flows or
(E) An evaluation of the consequences of deviations, including those affecting the safety and
health of employees.
(ii) Where the original technical information no longer exists, such information may be developed in
conjunction with the process hazard analysis in sufficient detail to support the analysis.
(3) Information pertaining to the equipment in the process.
(i) Information pertaining to the equipment in the process shall include:
Materials of construction;
Piping and instrument diagrams (P&IDs);
Relief system design and design basis;
Ventilation system design;
Design codes and standards employed;
Material and energy balances for processes built after May 26, 1992; and,
Safety systems (e.g. interlocks, detection or suppression systems).