Some English abbreviations in refining and chemical processing processes

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It’s my own summary, meant to serve as a starting point; I hope experts from all walks of life will offer their additional insights! DCS – Distributed Control System
ESD – Emergency Shutdown System
SIS – Safety Instrumented System
TMR – Triple Module Redundancy
QMR – Quadruple Module Redundancy
UPS – Uninterruptable Power Supply
RTD – Resistance Temperature Detector
EPS – Emergency Power System
PSA – Pressure Swing Adsorption
NPV – Net Present Value
ADU – Atmospheric Distillation Unit
AREX – Aromatics Extraction
ART – Asphaltic Residue Treating
CCR – Continuous Catalystic Reforming Unit
CCR – Continuous Catalyst Regeneration
Conradson Carbon Residue
CDU – Crude Distillation Unit
DCC – Deep Conversion Cracking
DCU – Delayed Coking Unit
DHT – Distillate Hydrotreating Unit
FCC – Fluid Catalytic Cracking
FGU – Foam Generation Unit
GEU – Gasoline Etherization Unit
GFU – Gas Fractionation Unit
GOH – Gasoil Hydrotreating
HCG – Hydrocarbon Gas
HOC – Heavy Oil Cracking
KHF – Kerosene Hydrogenation
LER – Light Ends Recovery Unit
LOCC – Light Olefins Catalytic Cracking
LPG – Liquefied Petroleum Gas
MHCU – Mild Hydrocracking Unit
MSCC – Millisecond Catalytic Cracking
MTBE – Methyl Ter-Butyl Ether
NHT – Naphtha Hydrotreating
NRU – Nitrogen ReInjection Unit
ORU – Oxide Removal Unit
PP – Polypropylene Unit
PRU – Propane Recovery Unit
PSA – Pressure Swing Adsorption – Hydrogen Enrichment
COS – Carbonyl Sulfide
SGC – Saturated Gas Concentration Unit
SHP – Selective Hydrogenation Unit
SR – Semi-Regeneration Reforming
SRU – Sulfur Recovery Unit
SWS – Sour Water Stripping
VDU – Vacuum Distillation Unit
VGO – Vacuum Gas Oil
VPSA – Vacuum Pressure Swing Adsorption
VRDS – Vacuum Residue Desulfurization
ARDS – Atmospheric Residue Desulfurization
MDEA – Methyldiethanolamine
RHDS – Residue Hydrodesulfurization
BTX – Benzene, Toluene, Xylene Mixtures
RF – Recycle Feed
RFCC – Resid Fluid Catalytic Cracking
EOR – End of Running