Within industry, piping is a system of pipes used to convey fluids (liquids and gases) from one location to another. The engineering discipline of piping design studies the efficient transport of fluid.12 Industrial process piping (and accompanying in-line components) can be manufactured from wood, fiberglass, glass, steel, aluminum, plastic, copper, and concrete. The in-line components, known as fittings, valves, and other devices, typically sense and control the pressure, flow rate and temperature of the transmitted fluid, and usually are included in the field of Piping Design (or Piping Engineering).
Piping systems are documented in piping and instrumentation diagrams (P&IDs).If necessary, pipes can be cleaned by the tube cleaning process. "Piping" sometimes refers to Piping Design, the detailed specification of the physical piping layout within a process plant or commercial building.In earlier days, this was sometimes called Drafting, Technical drawing, Engineering Drawing, and Design but is today commonly performed by Designers who have learned to use automated Computer Aided Drawing / Computer Aided Design (CAD) software., Źródło: https://en.wikipedia.org/wiki/Piping
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They can also carry out work tiling and painting if required finish the bathroom, which they do.
A boiler is a closed vessel in which water or other fluid is heated.