Sanitation, Plumbing Design and Installation (Part 9) | Master Plumber Licensure Exam Refresher

Soft copper water tubing should be expanded with a flaring tool. Cement mortar joints are generally prohibited in new building sewers, except for repairs. For joints between asbestos cement pipe and other approved pipes, an approved adapter coupling is required.

Hot and cold water lines for a kitchen sink should be 584mm from the finished floor. If a garbage disposal is installed in a two-compartment sink, the waste line should be roughed in at 406mm above the finished floor. The rim of a sink and surrounding counter should be adjustable in height from a fixed height of 865mm, and the P-trap top should be no higher than 180mm below floor level.

Asphaltum protects lead from corrosion during the concrete curing period. A datum is an established level or elevation from which vertical measurements are taken, while a benchmark is a measure upon which all other elevations are based. A sectional elevation drawing provides width and height information for a specific part of a structure.

A dumpy level is a surveyor's level with a short inverted telescope that rotates in a horizontal plane. A leveling rod is a graduated rod used to measure vertical distance between a ground point and the level. Absolute pressure is calculated as gauge pressure plus atmospheric pressure.

The preferable temperature for automatic laundry and dishwashing machines is 160°F. Insulating hot water pipes can reduce heat loss by up to 80%. A protector rod is a special device used to prevent corrosion in some water heaters.

The standard length of a fire hose is 23 meters. The approximate height of a service sink from the floor level to the fixture rim is 36 inches. A horizontal branch with a 4-inch diameter is allowed a total of 160 DFU (Drainage Fixture Units).