Plumber - some facts from Wikipedia

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A plumber is a tradesperson who specializes in installing and maintaining systems used for potable (drinking) water, sewage and drainage in plumbing systems.

The term dates from ancient times, and is related to the Latin word for lead, "plumbum".

The word "plumber" dates from the Roman Empire.3 The Latin for lead is plumbum.
Roman roofs used lead in conduits and drain pipes4 and some were also covered with lead, lead was also used for piping and for making baths.5 In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall".6 Thus a person with expertise in working with lead was first known as a Plumbarius which was later shortened to plumber.
Źródło: https://en.wikipedia.org/wiki/Plumber

Steel pipes in plumbing

Galvanized steel potable water supply and distribution pipes are commonly found with nominal pipe sizes from 3?8 inch (9.5 mm) to 2 inches (51 mm).
It is rarely used today for new construction residential plumbing.

Steel pipe has National Pipe Thread (NPT) standard tapered male threads, which connect with female tapered threads on elbows, tees, couplers, valves, and other fittings.

Galvanized steel (often known simply as "galv" or "iron" in the plumbing trade) is relatively expensive, and difficult to work with due to weight and requirement of a pipe threader.

It remains in common use for repair of existing "galv" systems and to satisfy building code non-combustibility requirements typically found in hotels, apartment buildings and other commercial applications.

It is also extremely durable and resistant to mechanical abuse. Black lacquered steel pipe is the most widely used pipe material for fire sprinklers and natural gas. Źródło: https://en.wikipedia.org/wiki/Plumbing

Job advertisements in the plant hydraulic

Every plumber has a practical education in the field of hydraulics supported by practices in one of the plumbing.
Only a certificate of holding of such practices would constitute a hydraulic plant manager ensures that the worker employed by him will be competent and honest. Announcements of job opportunities in the hydraulic plant are posted on various bulletin boards and websites dedicated to people looking for work. It also happens that to find a job at the plant hydraulic will be visiting his website. Through reading this page you will be instantly familiar with the character of the work performed by the hydraulic plant looking for new employees..

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