Standard construction safety and construction site background . Safety concept .
work outdoor wear safety equipment at utility construction site .
Engineer or Safety officer holding hard hat with the mobile crane machine is background in construction site.
Safety in Refinery Concept , safety standard set on working table, Background power plant.
Safety in Refinery Concept , Double exposure of safety standard set on working table, Background power plant , heavy petrochemical industry estate use for energy , power , fuel ,gas .
Double exposure of safety equipment and engineer working at construction Site . Construction and Safety concept.