barrel
business
cargo
conduit
delivering
delivery
energy
equipment
fuel
fueling
gas
gas pipeline
heat
industry
lay
lead
line
main
metal rolling
mineral oil
minerals
oil
oil pipeline
petrol
petroleum
pipe
pipeline
piping
pressure
purveyance
reliable
resources
running
squeeze
steel
supplier
supply
swap
swapping
system
transfer
transit
transmission
trunk
tube