ASME A112.18.2-2020 pdf free download.Plumbing waste fittings
3.2 Abbreviations
The following abbreviations apply in this Standard:
ABSI — acrylonitrile-butadiene-styrene
ASAI — American Standards Association
DWVI — drain, waste, and vent
NCI — National Coarse
NPSI — Nominal Pipe Size
NPSMI — National Pipe Straight Mechanical
NPTI — National Pipe Tapered
ODI — outside diameter
PBTI — polybutylene terephthalate
PPI — polypropylene
PVCI — 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 2), 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.
4.1.3 Plastic tubular waste fittings
Plastic tubular waste fittings shall be made of acrylonitrile-butadiene-styrene (ABS), polypropylene PP),polyvinylchloride (PVC), or polybutylene terephthalate (PBT), and shall comply with or exceed one or more of the following cell classifications:
a) ABS for fittings and mechanical joints: cell classification 20211 in ASTM D3965;
b) ABS for tubes: cell classification 42222 in ASTM D3965;
c) reinforced PP: cell classification PP0105G20A33350 in ASTM D4101;
d) unreinforced PP:
i) cell classification PP0110B55140 in ASTM D4101; or
ii) cell classification 55230 or higher in Table B of ASTM D4101;
e) PVC: cell classification 12454 or 14333 in ASTM D1784; or
f) PBT: cell classification TPES 0113 in ASTM D5927.
4.1.4 Plastic pipe and pipe fittings
ABS or PVC used for manufacturing drain, waste, and vent (DWV) plastic pipe and pipe fittings shall comply with one of the following Standards:
a) CAN/CSA-B181.1;
b) CAN/CSA-B181.2;
c) ASTM D2661;
d) ASTM D2665;
e) ASTM F628; or
f) ASTM F891.
4.1.5 Copper alloys
Copper alloys shall have a minimum copper content of 56% by weight.
4.1.6 Cast iron
Cast iron shall be of class 25, as specified in ASTM A48/A48M.
4.1.7 Ductile iron
Ductile iron shall be Grade 60-40-18 or Grade 60-45-12, as specified in ASTM A536.
4.1.8 Stainless steel
Stainless steel alloys shall be of the 300 or 400 Series.
4.1.9 Elastomeric fittings
4.1.9.1 Elastomers
Elastomeric waste fittings shall comply with the material requirements of CSA B602.
4.1.9.2 Elastomeric tubular parts
The wall thickness of elastomeric tubular parts shall be at least 2.0 mm (0.079 in).
4.2 Installation
4.2.1 Connection to waste system
Waste fittings shall be provided with a means to connect to a type of trap or waste system in common use.
4.2.2 Protection of finish Provision shall be made to enable waste fittings to be connected and mounted without marring the finish or otherwise damaging the fitting or the surface on which it is to be mounted.
4.2.3 Fixture seal Provision shall be made for a method of establishing a seal between a waste fitting and the fixture to which it is fastened.
4.3 Threads
4.3.1 DWV plastic pipe and fittings Taper threads used on plastic tubular waste fittings complying with Clause 4.1.3 and used on ABS or PVC DWV plastic pipe and pipe fittings complying with Clause 4.1.4 shall
a) be moulded;
b) comply with ASTM F1498; and
c) be a minimum of 2.5 threads long, with a minimum of one thread engagement.
4.3.2 Metallic pipes and fittings
Threads used on pipe and fittings manufactured from metallic base materials shall comply with ASME B1.20.1.
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 one thread engagement. The threads shall be NPSM threads. The thread form shall comply with Table 6 of ASME 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° thread and shall be at least 2.5 threads long.ASME A112.18.2 pdf download.ASME A112.18.2-2020 pdf free download
