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Plumbing Pipefitting Welding and HVAC Home Piping Industry Apprentices EARN WHILE THEY LEARN. Building Trades Mechanical Equipment Serviceman Download and fill out your application today. Northwest Ohio Piping Industry Comprised of more than 1400 highlytrained and skilled journeymen and apprentices the Northwest Ohio Piping Industry provides plumbing pipefitting welding and HVAC heating ventilation and air conditioning service to meet the residential and commercial needs throughout the 12 counties of Northwest Ohio. We welcome you to look around our site and learnmore about the hardworking men and women that make up the Piping Industry and the work we do.