HAP
Hazardous Air Pollutant
HAZCOM
Hazardous Communication
HAZOPS
Hazards and Operability Study
HAZWOPER
Hazardous Waste Operations and Emergency Response (29 CFR 1910.120)
HC
Hydrocarbon(s)
HCP
Hazards Control Program
HCS
Hazards Communication Standard (29 CFR 1910.1200) or Hazards Control System
HEG
Homogeneous Exposure Group
HES
Health, Environmental and Safety
HHS
Department of Health & Human Services
HLPSA
Hazardous Liquid Pipeline Safety Act (1979)
HMTA
Hazardous Materials Transportation Act (1974)
HOC
Halogenated Organic Compounds (Organic compounds containing Fluorine, Chlorine, Bromine, Iodine or Astatine)
HON
National Emission Standards for Hazardous Organic Air Pollutants
HSWA
Hazardous and Solid Waste Act (1984 RCRA Amendment)
Hydrocracker
A processing unit used for catalytic cracking of hydrocarbon feedstocks in the presence of hydrogen
Hydrogen Plant
A process unit used to manufacture and/or purify hydrogen.
Hydrotreater
Purification process unit which uses hydrogen to remove sulfur and metal contaminants from partially refined oil.