Ключевые слова: 3d, abstract, chemical, connection, draw, drawing, energy, engineering, equipment, facility, factory, faucet, fitting, fuel, gas, gasoline, heavy, illustration, industrial, industry, line, oil, outline, pairs, perspective, pipe, pipeline, piping, plant, plumbing, power, pressure, resources, silhouette, sketch, stainless, steel, technology, tube, tubing, valve, water, wire frame, wireframe,