abstract
barrel
beam
big
blue
cad
desing
dimensions
drawing
electricity
energy
engineering
equipment
facility
factory
fuel
gas
gasoline
heat
heavy
industrial
industry
insulation
iron
line
manufacturing
metal
mineral
oil
pairs
pipe
pipeline
piping
plant
power
pump
reflection
resources
sewage
shine
sketch
stainless
steel
technology
tube
valve
wide angle