energy

factory

thermal

industrial

heating

industry

pipe

plant

production

refinery

power

steam

technology

natural

pipeline

water

chemical

dusk

engineering

fuel

metal

pollution

sky

gas

station

structure

heat

adult

businessman

caucasian

checking

computer

control

engineer

experience

expert

hardhat

inspection

job

liquefied

lpg

management

manager

observing

person

professional