building
business
chemical
construction
container
drawing
economic
energy
engineering
equipment
exploration
extraction
factory
fire
flame
freehand
fuel
gas
graffiti
grunge
heavy
icon
illustration
industry
liquefied
liquid
lng
manometer
manufacture
mine
mineral
natural
paintbrush
plant
power
pressure
production
pump
resource
set
silhouette
sketch
source
splash
storage
supply
tank
technology
transportation