Plumbing Traps

Building utilitiesMWF 9:00-10:00ARCH. FelicanoPlumbing TrapsAgutaya, Paulo ManuelInfante, Nikki Maalat, Patricia

TrapTrap used on plumbing fixture is a device scientifically designed to prevent the back flow of gases coming from the sewer passing through the outlet of the fixture.A trap is a device which is used to prevent sewer gases from entering the buildings. The traps are located below or within a plumbing fixture and retains small amount of water.The retaining water creates a water seal which stops foul gases going back to the building from drain pipes. Therefore all plumbing fixtures such as sinks, washbasins, bathtubs and toilets etc. are equipped with traps.

1856 United States innovated a trap and developed the P-trap and was called Gooseneck attributed to its form like the neck of a goose.Types of TrapsS-shaped TrapsP. TrapBottle TrapFloor TrapGrease TrapGully TrapIntercepting TrapQ. Trap

S TrapA plumbing trap that takes the shape of the letter S and is used where a waste pipe feeds into the floor instead of the wall, which uses a P Trap. Disallowed in many parts of the country, they can create a siphoning situation, pulling water out of the trap.S Trap

P Trapalso known as theS-bendinvented by Alexander Cummingsin 1775 but became known as theU-bendfollowing the introduction of the U-shaped trap byThomas Crapperin 1880.

Alexander CummingsThomas CrapperTrap or Water SealClassified into Two:

* Common Seal P-Trap has 5 centimeters deep water seal between the overflow and the dip, that offer a resistance against abnormal conditions.

* Deep Seal P-Trap has from 7.5 to 10 cm deep, designed for abnormal situations likeP-Traps

Deep Seal P-TrapCommon Seal P-TrapBottle TrapA bottle trap is a straight and thin waste pipe with no curves or bends as seen in S- or U-bend pipes. The term is used in the plumbing industry to describe part of a sink's drainage system. It works by allowing wastewater to flow away while leaving clean water standing in the bottom half of the trap.Practical Uses:Designers and plumbers use bottle traps when plumbing space is limited in kitchens and bathrooms.Bottle Trap

Floor TrapTrap provided in floors to collect used water from floors of bathroom , kitchen or washing floor etc.

Floor Trap

Grease TrapGrease traps are plumbing devices designed to intercept most greases and solids before they enter a wastewater disposal system. Common wastewater contains small amounts of oils which enter into septic tanks and treatment facilities to form a floating scum layer.Grease Trap

Grease Trap

Gully TrapGully trap is a deep seal trap which is provided on the external face of the wall for disconnecting the waste water flowing from kitchen , bath , wash basin & floors from the main drainage system.Gully Trap

A. extreme heat condition in the areaB. increase and decrease of atmospheric conditionC. circumstances where total ventilation cannot be obtanedWater Seal Traps that could be used to serve plumbing fixteures classified as:

Permissible Traps Objectionable TrapsPermissible Traps

22Objectionable Traps

P Trap InstallationAccording to the National Plumbing Code on trap installation provides that:

All traps shall be self-cleaning.Trap shall be installed as near the fixture as practical.Short vertical leg eliminates high velocity of water discharge.4. Trap shall be installed within 60cm of the fixture it serve.5. Shall be provided with cleanout.6. Long Run Horizontal Pipe or Running Trap could be used only near the floor drain area or yard.7. The dip portion of the trap shall be short as possible to avoid retarded flow of water. Likewise to the horizontal leg connection to the waste pipe.

8. Overflow pipe from fixture shall be connected to the inlet side of the trap.9. Each fixture shall have its own trap.Exception to the rule:a. two laundry trays and a kitchen sink connected to a single trap.b. Not more than 3 laundry trays using one trap.c. three lavatories on a single trap.

Trap Installation

27Drum TrapClassified as water seal device.Special features:1. intended for fixtures set on the floor2.used on fixtures that discharges substantial amount of water.3. can also serve as terminal for any type of indirect waste.

4. Drum Trap has two types:A. the 100mm x 125mm andB. the 100mm x 200mm

Advantages1. greater amount of water may pass through it in a shorter interval.2. it has higher resealing quality than the P-trap.Disadvantages1. large and cumbersome2. unsightly if the installation is exposed to view3. cleanout cover mechanism is above the water seal.4. high maintenance Size of Fixture Trap to be InstalledClassified into Three:

Class 1 For Private Use : like fixtures in residential, apartment and private bathroom of hotels.Class 2 For Semi Public Use: office bldgs., factories, dormitories, and for occupants use only.Class 3 For Public Use: such as schools, gymnasium, hotels, railroads and bus terminals.9