Sanitation, Plumbing Design and Installation (Part 3) | Master Plumber Licensure Exam Refresher

A pressure surge absorbing device operating through the compressibility of air is called an air chamber. When a backflow prevention device does not bear a critical level marking, the bottom of the device constitutes the critical level. It is also noted that 'unsanitary' and 'insanitary' share the same meaning.

Disposal of sewage or other liquid waste shall be by means of the drainage system of the building. Roofs, inner courts, vent shafts, light wells, or similar areas having rainwater drains shall discharge to the outside of the building or a street gutter.

Piping, fixtures, or equipment installed in a way that interferes with the normal operation of windows or doors shall be relocated. All design, construction, and workmanship must conform to accepted engineering practices.

When supporting horizontal piping 5 inches in diameter, 1/2-inch hangers shall be used. Cast iron soil pipe installed vertically shall be supported at its base and every other story.

All trenches deeper than the footing of any building or structure and paralleling it shall be at least 45 degrees therefrom. Threaded pipe IPS 3/4 inch, except for gas piping installed horizontally, shall be supported at approximately 10-foot intervals.

Piping in the ground shall be laid on a firm bed. PEX piping may not be coupled together with shielded couplings; acceptable joints for PEX include metal insert or metal compression. Copper tubing installed vertically shall be supported at each story or at maximum intervals of 10 feet.

Mechanical devices may be used to complete backfilling where covering above any piping is at least 12 inches. 2-inch horizontal copper tubing drain pipe shall be supported at 6-foot intervals.

A pipe inside a building that conveys stormwater from the roof to a storm drain is called a conductor. An outlet on a boiler to permit emptying and discharging of sediment is called a boiler blowoff.