If you hold covered chemicals above Appendix A thresholds (e.g., anhydrous HF 1,000 lb; chlorine 1,500 lb; anhydrous HCl 5,000 lb; anhydrous ammonia 10,000 lb; H2O2 ≥52% 7,500 lb; arsine/phosphine/diborane 100 lb; flammables 10,000 lb), run a full Process Safety Management program. Aqueous HF (e.g., 49%) is not PSM-covered per OSHA's 1994 interpretation.

When it applies

Gas and chemical producers/handlers above thresholds.

Evidence you'd show

Policy document, Audit report

How often

Every year

If it isn't met

OSHA citations; catastrophic-risk exposure.