3d
bind
bolt
bond
closed
conduit
conflict
construction
control
crisis
distribution
embargo
energy
equipment
fuel
gas
gasoline
hydrogen
illustration
industry
isolated
knot
line
loop
node
nord
oil
petrochemical
petrol
petroleum
pipe
pipeline
piping
power
pressure
problem
pump
regulator
sanction
stop
stopcock
streem
supply
technology
tie
transit
transportation
tube
water
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