An area that is known to be corrosive or possible to explode if a spark occurs
Abbreviation for hazardous waste operations and emergency response, which is an OSHA standard for workers in hazardous material fields
Hot Dipped Galvanized
A cover material on certain types metal
New connection made to active existing pipeline
House Keeping Pad
Also known as an equipment pad, a concrete pad that lifts the equipment off of the floor to protect from water and other items.
Abbreviation for heating ventilation and air conditioning