barrel
building
chemical
chimney
color
concept
construction
crude
design
distillery
element
energy
environment
factory
fuel
gas
gasoline
icon
illustration
industrial
industry
isolated
line
linear
oil
outline
petrol
petroleum
pipe
plant
pollution
power
production
pump
refinery
sign
simple
station
storage
stroke
structure
symbol
tank
technology
thin
water
web
white