Current through Register Vol. 50, No. 12, December 20, 2024
A. Scope. The
provisions of this Chapter shall govern the materials and installation of
traps.
B. Trap Seal. Each fixture
trap shall have a water seal of not less than 2 inches (51 mm) and not more
than 4 inches (102 mm), except where a deeper seal is required by the plumbing
official for special conditions.
C.
Trap Level and Protection. Traps shall be set level with respect to their water
seals.
D. Traps Underground.
Underground traps, except "P" traps into which floor drains with removable
strainers discharge, shall be provided with accessible and removable
cleanouts.
E. Prohibited Traps. The
following traps (or types of traps) are prohibited from use:
1. a trap which depends for its seal upon the
action of movable parts;
2. "S"
traps;
a. Exception. Water closets, clinical
sinks, urinals and similar fixtures shall be allowed to be "S" trapped if the
fixture has an integral trap which is automatically and properly refilled using
an approved device.
3.
bell traps;
4. crown-vented traps
(see §913. D of this code);
5.
baffled or partition traps other than stainless steel, glass, plastic or
similar corrosion resistant materials;
6. tubular metallic traps of less than 20
gage [0.0320 inch (0.813 mm)] thickness; and,
7. running traps.
a. Exceptions
i. A running trap with cleanout may be
allowed on condensate waste lines (see §1305. I of this code).
ii. A running trap may be authorized for
certain floor level fixtures installed on a Combination Waste and Vent System
when plans and specifications have been specially approved by the state health
officer under the requirements of Chapter 12 (Alternate Designed Plumbing
Systems) of this code. See guidance for same under §1811. C.4 of this
code.
F. Double Trapping. A fixture shall not be
double trapped.
1. Exception. Fixtures in
mobile/manufactured homes and travel trailers are allowed to be double trapped
when a trailer trap is required to be placed in the building sewer/sewer
lateral as per §1003 E, §1515 J, §1523 A, §1613. J or §1623. A of this
code.
G. Unions
(Threaded). Unions may be used in the trap seal and on the inlet side of the
trap. Unions shall have metal-to-metal seats.
H. Fixture Trap Required, Location, and
Number of Traps Per Fixture. The requirement for a fixture trap and the number
of traps per fixture shall be in conformance with the following.
1. Plumbing fixtures, excepting those having
integral traps, shall be separately trapped by a water seal trap, placed as
close to the fixture outlet as possible.
2. A combination plumbing fixture may be
installed on one trap, if one compartment is not more than 6 inches (152 mm)
deeper than the other and the waste outlets are not more than 30 inches (762
mm) apart.
3. One trap may be
installed for a set of not more than three single-compartment sinks or laundry
trays or three lavatories immediately adjacent to each other in the same room,
if the waste outlets are not more than 30 inches (762 mm) apart and the trap is
centrally located when three compartments are installed.
I. Distance of Trap Weir from Fixture Outlet.
The vertical distance from the fixture outlet to the trap weir, or from the
outlet of an integrally trapped water closet or similar fixture to the
horizontal piping connecting the fixture to its vent, shall not exceed 24
inches (610 mm).
1. Exception. Washing
Machine Pumped Waste Drain. The vertical distance from the vertical standpipe
inlet receiving the pumped waste discharge from a washing machine (laundry) to
the trap weir shall be a minimum of 30 inches (762 mm) and a maximum of 48
inches (1219 mm), with the vertical standpipe inlet terminating a minimum of 34
inches (864 mm) above finished floor or in accordance with the manufacturer's
recommendation.
AUTHORITY NOTE:
Promulgated in accordance with
R.S.
40:4(A)(7) and
R.S.
40:5(2)(3)(7)(9)(16)(17)(20).
