4.1 Flashcards
(32 cards)
A sanitary drainage and vent system is sometimed referred to as ___________________________.
drain waste and vent systems.
removes wastewater and prevents sewer gases from entering buildings
sanitary drainage and vent systems
DWV is ______________ system for efficient waste removal
Sanitary Drainage and Vent System
A system consists of traps at each fixture,and fixture branch, stack, and drain pipes that carry wastewater away from the plumbing fixtures and out of the building.Gravity is the driving force behind wastewater flow, so the _______________ is known as a gravity system.
sanitary drainage system
Introduces and circulates air in the system to maintain atmospheric pressure in the drain lines and ensure adequate gravity flow of wastewater
Prevents a negative pressure (suction) Exhausts sewer gases to the outdoors.
Vent System
A U-shaped pipe that retains water to block sewer gases.
Holds a small quantity of wastewater to maintain a seal.
Prevents foul odors and hazardous gases from entering buildings.
Traps
TYPES OF TRAPS
most commonly used and preferred
P - Trap
TYPES OF TRAPS
built into fixture ( eg. toilets)
integral trap
TYPES OF TRAPS
prohibited due to siphoning issues
S - Trap and U - Trap
In installing traps,
Installed immediately ____________ of the fixture
Should be as close to the fixture as possible (within __ feet)
Designed for easy cleaning and maintenance
A removable plug in the trap may provide access or the trap may have screwed connections on each end for easy removal.
downstream
2
MAINTENANCE AND COMMON ISSUES OF TRAPS
___________: Water evaporates if the fixture is rarely use
___________: Debris accumulation can obstruct flow
____________________: High vacuum can break the water seal
Dry Taps
Blocked Traps
Vacuum Pressure Issues
Passive plumbing devices that trap, separate, and retain unwanted substances.
Prevents blockages, backups, and contamination of wastewater
Prevents solidified grease from coating pipes
Interceptors
used in restaurants , cafeterias, and food service facilities
Prevent grease, fat, and oil from clogging sewer lines
must be located atleast _____ ft from hot water sources
Hot water must cool to ______ before entering the grease trap
grease interceptors
Found in car washes, manufacturing plants, and vehicle service centers
Capture floatable oils and settleable solids (sand , metals)
Prevents environmental contamination and sewer blockages
Oil - Sand Interceptors
Used in barber shops, beauty salons, and pet grooming facilities
Capture hair and FIBROUS materials from wastewater
Prevents clogs caused by accumulated hair in plumbing systems
Hair Interceptors
SIZING AND PLACEMENT OF INTERCEPTORS
Interceptors are sized based on a minimum ____-minute peak wastewater detention time
A grease interceptor for a restaurant can have a_________ gallon (3800 L) capacity ormore
Should be installed as close as possible to the ______________.
Sometimes function as _______, with exceptions
30, 1000, discharging fixture, traps
Must be readily accessible for periodic cleaning, inspection, and testing
Waste must be disposed of following health and safety regulations
Compliance with local plumbing codes is required
Maintenance and Regulations of Interceptors
Horizontal drain lines connecting plumbing fixtures to the sanitary drainage system
Essential for proper wastewater flow from fixtures to stacks
Require proper slope to ensure gravity-driven drainage
Fixture Branch
FIXTURE BRANCH SLOPE REQUIREMENT
Proper slope ensures smooth waste flow and prevents blockages
Slope should be between _____ to ____ inch per foot
Prevents buildup and ensures gravity - assisted drainage
1/8, 1/2
PLACEMENT OF FIXTURE BRANCH
- Typically run under the _____ for urinals, toiltes, tubs and showers
- can also be installed within walls for certain fixtures
- muts be positioned to allow easy ___________ and avoid obstructions
floor, maintenance
MATERIALS USED FOR FIXTURE BRANCH ARE
copper, approved plastic, galvanized steel, cast iron
is a vertical pipe that carries wastewater or vent gases from multiple plumbing fixtures in a building
Stack
TWO MAIN TYPES OF STACKS
Carries human waste from toilets
Soil Stack
TWO MAIN TYPES OF STACKS
carries wastewater except human waste
waste stack
