Section 5- DWV Flashcards
Underground waste pipe installed beneath a concrete slab shall not be less than
2in in diameter and extend no less than 12 inches above the concrete slab
Tubular brass, PVC, or ABS trap shall not be installed
below the finished floor serving a fixture
TRAP REQUIREMENTS
Fixtures shall be trapped by a water seal how?
seperately; as near as possible to the fixture; but not exceeding 10in from bottom of fixture to the dip of the seal
A fixture trap shall have a water seal not less/more than
less than 2in nor more than 4in
Waste from a bathtub shall or other fixture shall not discharge
into a water closet bend
Are double traps permitted
no
Traps shall be
self cleaning, true to its water seal, protected from frost and evaporation
Trap primers are required on
Floor drains only in mech rooms or boiler rooms AND all open receptacles that receive TP device discharge only
are crown vents permitted
no
fixture traps shall be protected from
siphonage and backpressure
air circulation shall be assured by
means of an individual vent
an open drain, like a hub drain or open receptacle, shall not be installed in
a plenum space
distance of trap and vent is measured
along centerline of waste or soil pipe from vertical inlet of trap to vent opening
fixture trap vent shall not be
below dip of trap except for water closet
fixture branch on a water closet shall not be more than
4ft 6in
Grease traps must be
as near to fixture as possible, approved by dept, and if business establishment, installed per municiple ordinance or State code from private sewage
Sand traps shall be
readily accessible and serve the purpose intended
Slip joints permitted?
are permitted on inlet side; single 1.5in with elastomeric gasket on the outlet side
PIPE CLEANOUT REQUIREMENTS
In a building served by stack over 45ft, a clean out shall be provided at
base of each vertical of soil stack
There must be at least 1 clean out in the building drain where
Full size inside branch in the wall or outside within 2 ft of foundation with a 2 directional fitting (combo tee wyes)
Outside cleanout shall be extended to…
finished grade
Cleanout size shall be
same nominal size as pipe it serves but not less than 4in for larger pipe
Distance between cleanouts in all sewers shall not exceed
150ft
What shall be considered as a cleanout and with what exception
A floor or wall connection of a fixture, except where house drain enters a building
GRADES AND SUPPORTS OF HORZ PIPING
Horizontal piping shall align at uniform grade not less than what and be supported how
Not less than 1/8 in per foot and according to manufacturer
Horizontal piping supports shall not exceed
10ft
A stack shall be supported
At base and at floor level
No hub pipe and fittings shall be supported at
Each joint of pipe and fittings
PVC shall be supported
Every four feet or less, at base of vertical stack, and at each trap branch as close to Trap as possiblr
PE pipe and fitting supported how
Continuously with v channel
CHANGE IN DIRECTION
Single and double sanitary tees
Maybe used in vertical stack (soil waste and vent)
May a sanitary tee be placed on back or side
Yes but not at an angle of more than 45 degrees
Name the prohibited fittings
- double hub bend or tee or inverted hub on sewer, soil or waste
- drilling and tapping house sewer or house drain or DWV pipe
- Use of a saddle hub
- Pipe installed with hub or restriction that reduces area or capacity of pipe
- Traps that depend on a movable part or has a concealed interior partition for a seal
Can dead end be used in a drainage system
no
PROTECTION OF MATERIAL
Pipe passing under or through a wall shall be
protected from breakage
Pipe passing through or under cinder, concrete, or other corrosive material shall be
protected from external corrosion
DWV pipe shall not be installed or permitted outside unless
ADEQUATE pervision is made to protect it from frost
In addition to being protected from frost, outside vent shall
be increased to full size as if it were passing through a roof
SOIL AND VENT STACKS
Buildings with plumbing fixtures shall have soil and vent stack(s) with three things
extending full size through the roof, and be as direct as possible w/out sharp bends, and sized based on total fixture units
FULL SIZE, DIRECT, SIZED BY TFU
HOUSE DRAIN
size of house drain shall be determined by
total number of fixture units
Total area of vents through the roof shall be….
equal of that to house drain with a min number of one 3in stack
If a 3 in house drain enters the building it shall be attached to
a three in stack
One floor drain may be added to the house drain if
it conforms to Section 23 and without counting toward fixture units of the system
A 3in closet bend shall have a _______ flange
4x3in
CHANGING SOIL AND VENT PIPES IN EXISTING
DWV piping shall be replaced with the appropriate material and sizing if
The fixtures are to be changed/replaced and the dwv does not extend undimished through the roof or there is sheet metal soil or waste piping
ROOF EXTENSIONS
A roof extension of soil and waste stacks shall run
full size at least 1ft above the roof
If a roof is used for purposes other than weather protection, stack extension shall not be less than
5ft
A stack of less than 3in shall be
increased to a minimum of 3 in before passing through the roof and the fitting placed at least 1ft below the roof
TERMINALS
The terminus of a stack or vent shall extend how far above top edge of door, window, scuttle or air shaft and under what condition
2ft if within 10ft of top bottom face or side or edge of said door, etc
MAIN VENTS TO CONNECT
All main vents or vent stacks shall connect and extend how
- connect full size at base of main soil or waste pipe at or below the lowest fixture branch
- extend undiminished in size through roof or be reconnected with main soil or vent stack at least 6in above rim of highest fixture
If it becomes necessary to increase size of vertical vent stack….
the entire stack shall be increased from base except if the height of a stack which does not serve as the main vent is less than 45ft
A vent or branch vent pipe shall be free from and graded how
drops or sags and drip back to soil or waste pipe by gravity
If vent pipe connects to horizontal soil or waste pipe, vent branch shall be taken off above the center line of the pipe and the vent pipe shall rise vertically at an angle of _____to a point ______inches above the fixture is is venting before_____________
45; 6 ; offsetting horizontally or connection to branch, main, waste ,soil or vent
A vent is not required on
backwater trap, subsoil catch basin trap, basement floor drain (if from flow line from center of the stack it is not closer than 5ft of the stack, nor farther than 20ft
A basement floor drain does not require an individual vent
if it branches into the house drain so that from flow line from center of the house drain it is not further than 10ft from the house drain
A common vent or common soil or waste pipe may be used if
2 WC, lavs, or fixtures of identical purpose are located on opposites side of a wall or partition or directly adjacent to each other within the distance by trap to vent minimums
Double sanitary tee or cross shall not be used if
common vent or soil and waste pipe are connected through a double fixture fitting for a water closet of less than 1.6 GPF
A manufacturer’s floor drain shall not require an individual vent if
within 10ft from main waste line or stack, if the the base of the stack is washed and stack(s) are undiminished through the roof or connected to a main vent stack
WITHIN 10FT f/ MAIN (waste) OR STACK, STACK IS WASHED/UNDIMINISHED (THR ROOF) OR CONNECTED TO MAIN VENT
An open receptacle may be connected to a floor drain line without being vented if
the waste line discharges into a four in master trap before entering the sanitary sewer system
INDIRECT WASTE CONNECTIONS
Waste pipe from a fridge drain or other receptacle where food is stocked or waste water from a cooled compressor shall
connect indirectly with house drain, soil or waste pipe
Indirect waste drain from fridge or food storage shall be
vented to outside air; discharge into an open sink or other approved open receptacle that is properly supplied with water; and the connection must be located in accessible and ventilated area
VENTED OUTSIDE, DISCHARGES IN OPEN SINK or RECEPTACLE SUPPLIED WITH WATER, CONNECTED IN ACCESSIBLE AND VENTILATED AREA
BAR AND SODA WASTE
bar and soda waste, sink, or receptacle shall have:
a _____ trap and branches
____in main
___ in fresh air pipe
1.5
2
1.5
Main waste from a bar/soda fountain into a
properly vented and traped open receptacle inside or outside building
OPEN RECEPTACLES
Soil or waste piping receiving discharge from an open receptacle shall be at least ____in. above ________ if it discharges into a septic system
6in above ground surface
FRIDGE AND CONDENSATE
Fridge or condensate discharge waste pipe shall not be less than ____and each opening shall be _________ and equipped with sufficient ______
1 1/2 for 1 to 3 openings
2in for 4 to 8 openings
trapped
cleanouts
OVERFLOW PIPES
Overflow pipes -waste from water supply tank or exhaust from a water lift shall not be ______ but shall discharge _________
-directly connected to a house drain, soil or waste pipe
-upon a roof or into a trapped open receptacle
ACID AND CHEM WASTES
Corrosive liquid waste shall be _____ before entering the house sewer.
diluted through acceptable dilution or neutralizing pit
LAB WASTE PIPING
must be sized according to ______ and ______ trapped
this regulation and individually trapped
A continuous waste and vent pipe system may be used if the waste discharges into ____________ located________ with a vent _______. Vent may be eliminated if the pit has a ___________.
dilution pit
outside the building
equal to the size of the drain
a ventilated cover
If dilution pit is not required and is not used, fixtures should be…
individually vented
If construction conditions permit, the base of the stack of continuous waste and vent system shall _______________ and _______________
be washed by the last fixture opening
continue full size independently through the roof.
A fixture branch exceeding trap to vent requirements from the main shall be______
revented (individually vented)
Trap on sinks shall not be lower than _____ from bottom of sink.
12 in
two chem sinks can be common vented if fixtures are not more than ____from center of each other
5ft
A flat vent may be allowed if
design of the building prohibits the type of vents required
A basement floor drain shall be
connected to house sewer, trapped and vented, readily accessible for clean, and of sufficient size
If a drain is subject to backflow or back pressure, the drain shall be quipped with
a backwater valve
A backwater valve shall be
made of noncorrosive material and constructed to ensure a positive mechanical seal, except if discharging waste
