PreFi Flashcards
The pipes should take the shortest possible route to
the house sewer or the terminating point of the
Sanitary system
Control components such as clean-outs, traps, and
vents, should be located strategically so as to ensure
efficient circulation
General Rules in designing
the Sanitary system
Subsystems of the
Sanitary System
Waste Collection System
Ventilation System
Conveys only wastewater or liquid waster free of fecal matter
Waste Pipe
Used for ensuring the circulation of air in a plumbing system and for relieving the negative pressure exerted on trap seals
Vent Pipe
A fitting or device designed and constructed to provide, when properly vented a liquid seal which prevents the backflow of foul air or methane gas without materially affecting the flow of sewage or wastewater through it,
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
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
House/Building Drain
extends from the house drain at a point ____ 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,
0.60 meters, House.Building Sewer
Use of 45 degree wye branches, combination wye - 1/8 bend branches, or other approved fittings of equivalent sweep
Horizontal to Horizontal change in direction
45 degree wye branches or other approved fittings of equivalent sweep
Vertical to Horizontal 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.)
Horizontal to vertical change in direction
The ____ of waste pipes or soil pipes depend of the amount of waste it carries
size
A lavatory discharges 0.47 liters/sec or 28.3 liters/min (7.5 gallons per min or 1 cu ft per min) which is equivalent to the ____
Fixture Unit
The F.U. rating of plumbing fixtures is based on the ___`
size of required trap
Maximum trap loading
fixture unit of pipe sizes
32 mm
38 mm
51 mm
76 mm
102 mm
1
3
4
6
8
Fixture unit of Discharge Capacity
Up to 0.47 L/s (up to 7.5 gpm)
0.50 to 0.95 (8 to 15 gpm)
1 to 1.89 (16 to 30 gpm)
1.95 to 3.15 (31 to 50 gpm)
1
2
4
6
Minimum slope or pitch of horizontal drainage pipe
2 % or 20 mm/m (1/4’’ per foot)
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
Types of Permissible Traps
The common p-trap
The deep seal p-trap
The stand trap
The running trap
The drum trap
Used for lavatories, kitchen sinks, laundry tubs, and urinals
Materials commonly used for the
P-trap: nickel, chrome plated brass,
Galvanized malleable copper, & PVC.
the common p-trap
water seal is about twice the size of the common p-trap
used for extreme conditions because resealing quality is greater
the deep seal p-trap
Used for fictures such as slop sinks that are usually built low in the ground, leaving very little space for a foundation and a trap
serves as a water seal & structural support for the fixture
the stand trap
used within the line of the house drain
the running trap
