Plumber

The word comes from the Latin plumbum, lead, the metal Roman pipes were made of. The job has not changed in purpose since then: supply clean water, remove waste, keep the two apart.

Two systems, two physics

Supply water arrives under pressure, so supply pipe can run up, down and sideways. Waste leaves by gravity, so every horizontal drain must slope, usually a quarter inch per foot. Every fixture has a trap, a water seal that keeps sewer gas out, and every trap needs a vent so the seal is not siphoned away. Drain, waste and vent (DWV) design is the heart of the trade.

Why it matters

The great public-health gains of the nineteenth and twentieth centuries came as much from pipes as from medicine: filtered water, sewers, and the backflow preventer that stops contaminated water from being pulled back into the clean supply. That is why plumbing is a licensed trade almost everywhere.

Plumbing and the vertical push

A tower cannot rise without water. Above about 150 feet, city pressure is not enough, so tall buildings use booster pumps and pressure zones, with tanks or pressure-reducing valves every few floors. The plumber and pipefitter install those zones floor by floor.

Learning it here

The Plumbing & Pipefitting program covers safety, blueprint reading, DWV systems, water supply, fixtures, gas piping, code and backflow. Credentials prepared: NCCER Plumbing Levels 1–4, ASSE backflow tester, and the path to the state journeyman plumber license.

Where it leads

Journeyman, master plumber, pipefitter, backflow tester, plumbing inspector, estimator, or contractor.