3d
abstract
blueprint
chemical
condensate
connection
electricity
energy
engineering
equipment
facility
factory
fitting
gas
gate
heavy
hose
illustration
industrial
industry
isolated
line
oil
outline
pairs
pipe
pipeline
piping
plant
platforms
plumbing
power
pressure
resources
silhouette
sketch
steel
tap
technology
transparent
tube
tubing
valve
water
wire
wire frame
wireframe