ASME A112.18.2:2005 pdf download

ASME A112.18.2:2005 pdf download ASME Standards Committee A112 on Plumbing Materials and Equipment
4.3.3 Compression and union nuts
Threads for compression and union nuts shall be a minimum of 2.5 threads long, with a minimum of onethread engagement. The threads shall be NPSM threads. The thread form shall comply with Table 6 ofASME B1.20.1.
4.3.4 Tapped bosses
Tapped bosses for threaded tubing shall have 1-1/4 or 1-1/2× 27 or 28 threads per inch ASA 60° threadand shall be at least 2.5 threads long.
4.4 solder connections
The dimensions of solder joint ends for connection to copper tube or copper tube fittings (exceptfactory-assembled parts) shall comply with ASME B16.23 or B16.29.
4.5 Replacement parts
4.5.1 Use of standard tools
Repair and maintenance of waste fittings shall be accomplished with the use of standard tools.
4.5.2 Replacement part design
Joints that have to be taken apart to replace worn parts after the fitting is installed shall be designed sothat disassembly and replacement are possible without damaging or marring the fitting or any significantsurface on which the fitting is installed.
4.6 Dimensions
4.6.1 outlet size
4.6.1.1 Lavatory and bidet waste fittings
Lavatory and bidet waste fittings shall be provided with a minimum 1-1/4 in nominal OD outlet.
4.6.1.2 Sink, shower, bathtub, laundry tub, and bar sink waste fittingsSink, shower, bathtub, laundry tub, and bar sink waste fittings shall be provided with a minimum 1-1/2 innominal oD outlet.
4.6.2 Slip joints
The inside diameter of slip joints shall fit with tubing of the same nominal size. Slip joints located on theinlet side of a trap shall be at least 13 mm(0.5 in) above the trap weir. See Figure 1.
4.6.3 Wall thickness
4.6.3.1 Metal tube and tubular fittings
When measured on a straight portion of the part, the wall thickness of metal tube and tubular fttings shallbe at least the following:
(a)brass or copper:
00.73 mm (o.029 in) unthreaded;
0.83 mm (0.032 in) threaded by cutting; andi) 0.40 mm (o.016 in) for corrugated tubing; and(b) stainless steel:
0.30 mm (0.012 in) unthreaded; and0.83 mm (0.032 in) threaded by cutting.
4.6.3.2 Plastic tube and tubular fittings
The wall thickness of plastic tube and tubular fittings shall be at least 1.58 mm (0.062 in).Note: This requirerment does not apply to topered or bevelled edges.
4.6.4 Sink strainer assemblies
4.6.4.1
Components of sink strainer assemblies made of stainless steel or brass shall include a body, a basket, and,if applicable, a sleeve, and shall have the following minimum thicknesses, measured before forming:
(a)body: 0.56 mm (0.022 in);
(bbasket: 0.38 mm (0.015 in); and(csleeve: 0.38 mm (0.015 in).
4.6.4.2
The gap between the strainer basket and the body shall be not greater than 5 mm (0.2 in).The depth ofthe strainer basket shall be such that, in the open position, the lip does not project above the body flange.Holes in the strainer basket shall be not greater than 5 mm (0.2 in) in the minor dimension.
4.6.4.3
The strainer body thread shall be made to accommodate a nut with a 1-1/2-11-1/2 NPSM thread thatcomplies with ASME B1.20.1. See Figure 2.
4.6.4.4
Tailpieces incorporating an adapter for a dishwasher hose connection shall comply with Figure 3.
4.6.5 Traps
4.6.5.1
Fixture traps shall have a minimum trap seal of 50 mm (2.0 in). See Figure 1.
4.6.5.2
A cleanout plug shall not reduce the waterway through the trap and shall have no projections that couldcause accumulation of debris or other matter in the trap. The plug shall be threaded, and the thread maybe tapered or straight.
4.6.6 Mechanical stoppers
4.6.6.1
The movable parts in a mechanical stopper shall be accessible without disconnecting the body from thefixture.
4.6.6.2
Seals between the linkage and the body of a mechanical stopper shall be designed to allow repacking orreplacement.
4.6.7 Elastomeric fittings
4.6.7.1 Materials
Elastomeric waste fittings shall comply with the material requirements of CSA B602.