ASME A112.18.2-2020 pdf download
ASME A112.18.2-2020 pdf download.Plumbing waste fittings.
Centre outlet — a lavatory waste fitting without an overflow opening.
Continuous waste assembly — a drain assembly for multiple compartments of a fixture that is connected to a common trap. See Figures 7 and 8.
Diversion tee — a fitting of a continuous waste assembly consisting of a tee fitting and an integral element that directs the flow downward to the outlet of the tee. See Figure 8.
Grey water — untreated residential wastewater from bathtubs, showers, lavatories, clothes washers, and laundry tubs that has not come into contact with kitchen waste or waste from a sanitary unit.
Note: Grey water does not include wastewater from kitchen sinks or dishwashers.
Grey water diverter — a waste fitting that incorporates a mechanism that can be operated by a user to direct grey water for reuse or disposal.
Linear shower drain — a receptacle containing a trench- or channel-shaped body and a solid cover or grate that is flush with the adjoining surface for receiving wastewater from a shower and conveying it to the drainage system.
Overflow — a conduit that is integral or attached to a fixture and whose function is to remove liquid from a fixture after the fixture has been filled past the desired level.
Patent overflow — a lavatory waste fitting incorporating an overflow opening. Sanitary unit — a water closet, urinal, bidet, or bedpan washer.
Significant surface — an exposed surface that, if blemished, spoils the appearance or affects the performance of a fitting.
Slip joint — an adjustable tubing connection that consists of a compression nut and compression washer and is designed to fit a threaded adapter fitting or a standard taper pipe thread.
Standard tools — tools that are normally carried by plumbers for installing and maintaining plumbing. Note: Examples include screwdrivers, key wrenches, flat-jawed wrenches, and pliers.
Strainer — a device designed to prevent debris from entering a drainage system.
Strainer basket — a removable component of a sink strainer assembly, designed to collect debris.
Strainer body — the fixed, exposed component of a sink strainer assembly connected to the fixture that accommodates the strainer basket.
Strainer shell — the unexposed component of a sink strainer assembly that connects the strainer body to the fixture that accommodates the strainer basket.
Strainer sleeve — the unexposed component of a sink strainer assembly that connects the assembly to the fixture waste connection.
Trap — a fitting that provides, when installed in a properly vented system, a liquid seal that prevents the back passage of gas without affecting the flow of sewage or wastewater through the system.
Trap seal — the vertical depth of a liquid that a trap retains, measured from the trap weir (the lowest point in the cross-section of the horizontal waterway at the trap exit) and the top of the tube at the lowest point of its bend. See Figure 1.
Trap wall adapter — a part of the waste system that is used to connect a trap outlet to a building drainage system. See Figure 2.
Twin waste elbow — a fitting of a continuous waste assembly that diverts waste from two horizontal branches in the same plane to a vertical outlet. See Figure 6.
Waste fitting — part of a waste system from a plumbing fixture to, and including, a fixture trap outlet or trap wall adapter.
3.2 Abbreviations
The following abbreviations apply in this Standard:
ABS — acrylonitrile-butadiene-styrene
ASA — American Standards Association
DWV — drain, waste, and vent
NC — National Coarse
NPS — Nominal Pipe Size
NPSM — National Pipe Straight Mechanical
NPT — National Pipe Tapered
OD — outside diameter
PBT — polybutylene terephtha late
PP — polypropylene
PVC — polyvinylchloride
4 General requirements
4.1 Materials
Note: The requirements of Clauses 4.1.2 to 4.1.9 are not intended to prevent the use of alternative materials for components that are not part of the drainage envelope.
4.1.1 General
The requirements specified in Clauses 4.1.2 to 4.1.9 shall apply only to wetted components that are part of the drainage envelope.
Note: The drainage envelope includes traps, tailpieces, trap wall adapters (see Figure 2J, diversion tees, twin waste elbows, overflow elbows, drain elbows, and strainer bodies. Components that are not considered part of the drainage envelope include pop-up stoppers, overflow plates, coupling nuts, strainer baskets and sleeves, and lift rods.
4.1.2 All waste fittings
Waste fittings and waste fitting components shall be made from materials that comply with this
Standard.