Summary
Highlights
A room with a shower or bathtub is categorized as a bathroom. Fixture connections requiring access panel removal for servicing are considered 'accessible'. A vertical vent continuing from a drain is a 'continuous vent'. The lowest piping receiving discharge inside a building up to 2 feet outside is a 'building drain'.
A horizontal drain sized for free air movement above its flowline is a 'combination waste and vent system'. The length along the centerline of a pipe and fittings is the 'development length'. A vent that also functions as a drain is called a 'wet vent'.
Galvanized wrought iron or steel pipe must not be used underground and should be kept at least 152 mm above ground. Pipe strainers must have a minimum total net inlet area of twice the outlet pipe's area. Air tests involve forcing air into the system to a uniform gauge pressure of 34.5 kPa or enough to balance a 254 mm mercury column.
Septic tanks need at least two 508 mm manholes or equivalent removable cover slabs for access. A 'cesspool' is a non-watertight excavation that retains solids while allowing liquid to seep through. The Revised National Plumbing Code of 1999 was approved on December 21, 1999, by President Joseph Estrada.
An 'offset' in piping brings one section out of line but parallel to the original. Vent openings must terminate at least 3 meters from any air intake. A 'Durham system' describes a soil or waste system using threaded pipe, tubing, or rigid construction with recess drainage fittings. The 'invert' is the lowest interior part of any non-vertical pipe. Brass fittings typically contain 85% copper. 'Dry standpipe' fireline installations are now obsolete. The interval distance between clean-outs in a lateral line is 15 meters.