Trap the vertical main of a system of soil waste or

Trap
the vertical main of a system of soil, waste or vent pipings
extending through one or more stories and extended thru the
roof.
Stack
any part of the piping system other than a main, riser or stack.
Branch
conveys only wastewater or liquid waste free of fecal matter.
Waste Pipe

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Sanitary Drainage System
House/Building Sewer
House/Building Drain
extends from the house drain at a point 0.60 meters from the
outside face of the foundation wall of a building to the junction with
the street sewer or to any point of discharge, and conveying the
drainage of one building site.
part of the lowest horizontal piping of a plumbing system which
receives the discharges from the soil, waste and other drainage
pipes inside of a building and conveys it to the house sewer outside
of the building.

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Sanitary Drainage System
Horizontal to Horizontal change in direction
use 45
°
wye branches, combination wye – 1/8 bend
branches, or other approved fittings of equivalent sweep
Vertical to Horizontal change in direction
45
°
wye branches or other approved fittings of equivalent sweep
CHANGES IN DIRECTION OF SANITARY
DRAINAGE LINES

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Sanitary Drainage System
Horizontal to vertical change in direction
use 45
°
or 60 ° wye branches, combination wye -1/8 bend
branches, sanitary tee or sanitary tapped tee branches, or
other approved fittings of equivalent sweeps.
No fitting having more than one inlet at the same level
shall be used (i.e., sanitary cross)
Double sanitary tees may be used when the barrel of the
fitting is at least two pipe (2) sizes larger than the largest
inlet, (pipe sizes recognized for this purpose are 51, 64, 76,
89, 102, 114, 127, & 152 mm dia.)

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Sanitary Drainage System
Minimum slope or pitch of horizontal drainage pipe – 2% or
20mm/m (¼” per foot).
Exception: Where it is impracticable due to depth of street
sewer, adverse structural features and irregular building plans,
pipes 102 mm dia or larger may have a slope of not less than
1% or 10mm/m (1/8” per foot), approved by the Administrative
Authority
MINIMUM SLOPE OF
SANITARY DRAINAGE LINES

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Sanitary Drainage System
Types of Permissible Traps:
The Common P-Trap
The Deep Seal P-Trap
Used for lavatories, kitchen sinks,
laundry tubs, & urinals
Materials commonly used for the
P-trap: nickel, chrome plated brass,
Galvanized malleable copper, & PVC.
Water seal is about twice the size of
The common P-trap
Used for extreme conditions because
resealing quality is greater

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Sanitary Drainage System
The Running Trap
Used within the line of
the house drain
The Stand Trap
Used for fixtures such as slop sinks
that are usually built low in the
ground, leaving very little space for a
foundation & a trap
Serves as a water seal & structural
support for the fixture

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Sanitary Drainage System
The Drum Trap
Has a large diameter (around 0.16 m)
Used for fixtures that discharge large amount of water
(bathtubs, shower or floor drains)

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Sanitary Drainage System
Traps REQUIRED
Each plumbing fixture, except those with integral traps, shall be
separately trapped with an approved-type waterseal trap.