Keywords:
Bearers, Boards, Caps (closures), Chromium, Compressive strength, Concretes, Corrosion, Design, Dimensions, Drainage, Enclosures, Gas appliances, Gas circuits, Gas pipelines, Gas supply, Gases, Heat, Height-adjustable, Lids, Long distance heating systems, Marking, Materials, Pipe caps, Pipework systems, Qualification tests, Quality, Quality assurance, Quality control, Roads, Rules, Sewage, Sewerage, Sewers, Shape, Specification (approval), Steels, Strength of materials, Surface boxes, Surveillance (approval), Technology, Testing, Valves, Water, Water pipelines, Water supply, Weights