SANITARY DRAINAGE SYSTEM

There are three degrees or grades of WASTE WATER

1. Storm Water- from the rain.2. Grey Water- wastes from laundries, wash basins, sinks, showers, bath tubs).3. Black Water - water plus human waste solid and liquid, urine, that is flushed out of toilets and urinals.

ELEMENTS OF THE SANITARY SYSTEM

1. Soil Pipe- any pipe which conveys the discharge of water closets, urinals, or fixtures having similar functions.2. Stack- a general term used for any vertical line of soil, waste, or vent piping.3. Soli Stack Pipe-a vertical soil pipe conveying fecal matter and liquid waste.

4. Stack Vent-an extension of a soil or waste stack abovethe highest horizontal drainconnected to the stack.

5. Vent- a pipe or opening used for ensuring thecirculation of air in a plumbing system and for reducing topressure exerted on trap seals.6. Unit Vent-an arrangement of venting so installed thatone vent pipe will serve two 12) traps.7. Wet Vent-that portion of a vent pipe through which liquid waste flow.8. Branch -any part of a piping system other than the main_, riser or stack.9. Main - the main of any system of continuous piping is the principal artery of the system to which branches may be connected. ·10. Branch Vent- a vent pipe connecting from a branch of the drainage system to a vent stack.11 . Waste Pipe '-a pipe which conveys only liquid wastes free ~f ! fecal matter.12. Drain-a sewer or other pipe or conduit used for conveying ground water, surface water, waste water, or sewage.13. Sewer-A pipe or' conduit for carrying sewage and waste liquids.14. Sewage- the liquid wastes conducted away frombuildings/structures, also of the storm water.15. Sewerage-a comprehensive term, including all construction forcollection, transportation, pumping, treatment and final dispositionof waste. 16. Cleanout Ferrule - a metallic sleeve, calked or otherwise,joined to. an opening in a pipe, ir.to which a plug is screwed thatcan be removed for the purpose of cleaning or examining theinterior of the pipe. 17. Trap - A fitting or device so constructed as to prevent the passage of air, gas, and some vermin through a pipe without materially affecting the flow of sewage or waste water through it.

18. House Drain -that part of the lowest horizontal piping of a plumbing system which receives the discharge from soil, waste and other drainage pipes inside of a building and conveys it to the house sewer. It should have a slope of at least 1/4" to a foot or .006 for every .30 meter . . (6 mm for every 300 mm).

19. House Sewer-the house sewer is that part of a plumbing system extending from a point about four (4) or five t5l feet from the inner face of the foundation wall of a buildingto the junction with another sewer.

20. House Trap - a trap connected toloyvest horizontal piping or HouseDrain.

21. Relief Vent - a vent the primary(Fresh Air Inlet) functiOn of whrch is to. provide circulation of air between drainage and vent system.22. Public Sewer-a common sewer directly controlled by public authority to which all abutters have equal rights .of connection.23. Sipitonage- a suction caused by the flow of liquids in pipes.

24. Spigot-The end of a pipe which fits into a bell. Also a wordsynonymously with faucet.

25. Seql-The vertical distance between the dip and crown wire of atrap.

26. Roughing-In-The installation of all pipes in the plumbingsystem that are in partitions and under floors.27. Finishing - The setting of Fixtures.28. Sump-a pit or receptacle at a low point to which the liquid wastes are drained.29. Shaft-a vertical opening through a building for elevators, dumbwaiters, light, ventilation, etc.30. Sleeve-a sheet metal placed when concrete is poured to accomodate future plumbing pipes.31 . Pipe Chase-an opening or space to accomodate a group of pipes .32. Duct -Opening for ventillation circulation of air.

SANITARY DRAIN -receive thedischarges of sanitary anddomestic waste only.a. Industrial drain -this housedrain receives the dischargesfrom industrial equipments. Dueto some objectionable acidwaste, this usually terminatesinto a separate drainage basin.

b. Storm drain-this receive thedischarges of all storm. Clear water or surface water washes except sanitary wastes this usually terminate into rivers, lakes, etc.

MATERIALS AVAILABLE FOR PLUMBING INSTALLATIONS

1. Galvanized iron (G.U or Steel Pipes made out of a Mild Steel drawn through a die and welded cast into 6.00 meters long. Its usual life span is from 15 to 20years.Howeversteel pipe is subject to deposits of salts and lime which gradually accumulate and eventually choke the flow of water. This type of pipe is corroded by alkaline and acid water. That is why when used for hot water line, it deteriorates faster than cold water supply pipe.

2. Plastic or Synthetic Pipe

There are two types:a. Rigid Typeb. Flexible Type

Rigid Type can be:

1. Polyvinyl chloride (PVC)2. Chlorinated Polyvinyl Chloride (cPVC)3. Unplasticized Polyvinyl Chloride (uPVCI4. Polypropylene (PPl)5. Acrylonitrile Butadiene Styrene (ABSI6. Styrene Rubber Plastic (SR)

Flexible Types are:

1. Polyethylene (PEl - Coil Form at 30 meters2. Polybutylene (PB) up to 150 meters long in coil Form

3. Cast Iron Pipe-This is durable and is conveniently installed in most of the plumbing needs in building which are less than 25 storeys high because water usually leaks at joints due to vibrations. Cast Iron is also affected to a certain extent by corrosion causedby the action of carbon dioxide, sulphur oxide and methane gases forming a solution of carbonic acid and sulphuric acid which attack the metallic materials, causing a slow chemical reaction or oxidation to take place forming ferrous oxide, called rusts.

Two Types:

1. SV- For building installations.2. XV -For underground installations this are extra heavy.

4. Acid Resistant Cast Iron Pipe-Made of an alloy of cast iron and silicon. It is commonly installed in chemical laboratories where acid waste are being discharged.5. Asbestos Pipe - made of asbestos fibers and portland cement. The thickness is twice that of standard cast iron. Most suited for embedment on concrete structures.6. Bituminous Fiber Sewer Pipe- Cheapest light in·weight, recommended for house sewer and septic tank installation. It could take slight soil movement without danger of cracking or pulling out of its joint. 7. Vitrified Clay Pipe-made from clay and with· a length of 0. 75 n:aeter treated with glazed compound. This is highly resistant to most acids and is well suited in underground installations working either as public or house ~wer, or storm in drain. Being made of clay. The physical property of this pipe is brittle. It easily cracks when laidon unstable ground or base.8. Lead Pipe-one of the oldest plumbing materials. Lead is highly resistant and is very suitable to underground installation. But because it is poisonous and injurious to human health, it is never recommended to convey water for human consumption.9. Galvanized Wrought Iron Pipes- this is better than steel pipe for plumbing installation,because it is more resistant. to acid waste than the steel pipe. ·10. Brass Pipe - The most expensive of all types of pipe. Made of an alloy of zinc and copper mixed at a proportion of 15% and 85% respectively. The brass pipe is a superior

material for waste and water installation because ot'its smooth surface aside from its high resistanc.e to acids.

11 . Copper Pipes-A durable material which is extremely corrosive resjstant-easiestto install. Type K - heaviest for underground installations Type L - Lighter than type k comes in flexible and rigid type Type M - Thinner and available only in rigid form.

PLASTIC PIPES

Color Coding:Potable water - BlueElectric Conduit - Orange or Light GrayIndustrial System - GrayCommunication Cable- YellowSewage System - Orange Brown

SIZES OF PIPE:

The size of the service pipe connecting the main and the house being served is governed by the:

a) maximum demand and theb) probable demand or peak load

MAXIMUM DEMAND-refers to the maximum water discharge for plumbing fixtures in terms of unit. The maximum demand of water supply is equal to the total fixture units in the plumbing system wherein one unit is approximately valued at 8 gallons of water discharge per minute.

PROBABLE DEMAND OR PEAK LOAD Is another factor considered in determining the size of the water service pipe. The question of how many fixtures will be used simultaneously is difficult to ascertain. but according to survey.

a. The Fewer the number of Fixtures installed the higher the percentage or probability of their simultaneous use.b. The greater the number of'Fixtures installed, the lesser the percentage or possibility of simultaneous use.

GALLONS OF WATER PER MINUTE GALVANIZED IRON OR PLASTIC PIPE

*NOTES:a. Doubling the diameter of a pipe line increases its capacity up to ·4 times.b. A 20 mm service pipe can supply 2 branches at 13 mm diameter each it could deliverup to 10 gals/ min. Sufficient enough to serve UJ> to 10 fixtures.c. A 25 mm service pipe can supply 2 branches at 20 mm diameter. It can deiiver up to 18 gals/ min and serve 20 fixtures.

TRAPS. VENTS and AIR GAPS

a. TRAPS-The only separation between the unpleasant and dangerously unhealthy gases in a sanitary drainage system and the air breathed by room occupants is the water caught in the fixture trap after each discharge from a fixture. Traps are of steel, cast iron, copper, plastic, or brass except in water closets and urinals which is integrated vitreous china.

A minimum depth of 2 in. (.05. and a maximum of .10 (4") are common standards for water seal.

An exception to the rule that each fixture sh04Jid have ita own trap. Common exception include two laundry trays and a kitchen link connected}to a single trap (not more thin 31

When fixtures are not always used, the water in traps can evaporate into the alt, breaking the seal of the trap. especially in floor drains connected to soil piping tool odorwill emanate in the air. (always fill with water)

TRAP SEAL LOSS

This il due to an inadequate ventilation of thetrap wherein the atmospheric minus or pluspressure affect the installation. Trap seal isthe vertical distance between the dip and thecrown weir of a trap. Also it is the water in thetrap between the dip and the crown weir.

1. SIPHONAGE- the result of a minus pressure in the drainage system. (Pressure is a force required to move gas or liquid) when a large' amount of water flow rapidly through the trap, self siphoning is automatically developed and the water content of the trap (seal) Is absolutely discharged. This is known as a trap seal loss. When the seal is lost, back flow of gases from the sewer line or septic tank will pass into the trap, funds its way to the fixture drain outlet and spread into the room.

INDIRECT OR MOMENTUM SIPHONAGE

This type is the result of a minus pressure in the pipecreated by heavy discharge of water from a fixtureinstalled on a line serving another fixture at a lower floor

2. BACK PRESSURE-This condition is caused by a plus pressure which blows the water out(of the fixture. It happens usually when a large flow of water drop and form as slug and compress the air inside the pipe. The compressed air will find its way out through a weather point. The trap seal will give way and blow out of the fixture.

3. EVAPORATION - This process is a minor problem and lessprobable to drain the water inside the trap. Evaporation happensonly on floor drains not regularly used to admit water but isexposed to extreme temperature.

4. a, CAPILLARY ACTION- This kind ot trapseal loss seldom happen and is rarelyexperienced by homeowners. The conditionis caused bv a suspension of a foreign objectsuch as a string, rags, strands of hairextended over the outlet arm of the trap.

b. AIR GAPS AND VACUUM BREAKERSThe proximity of sewage to potable waterat textures is inescapable. It is possiblethat sewage could accidentally besiphoned into pipe carrying potablewater.

c. VENTS-For the admission of air and thedischarging of gases, soil and wastestacks are extended through roofs, and a system of air vents, larger paralleling the

drainage system is also provided. The Introduction of air near the fixture (and in the case of loop venting, at the branch soil (line) breaks the possible siphonage of water out of the trap. Loop venting which permits an air and gases to pass in and out of the soil or waste branch instead of at its fixture, is fully effective in preventing the siphonage of trap seals.

TYPES OF VENTS:

1. MAIN SOIL AND WASTEVENT

This is the portion of the soilpipestack above the highestinstalled fixture branchextended through the roof. Itserves as the te;minal for themain vent and other vents ofthe plumbing installations.

2. MAIN EVENT

Is that portion of the ventpipe system which serves asa terminal of the smallestforms of units and groupedfixture trap ventilation. Themain vent is connected fullsize at their base to the mainsoil or waste pipe at or belowthe lowest fixture branch andshould extend undiminishedin size above the roof orshould be reconnected withthe main soil vent at least1.00 meter above the highestfixture branch.The main vent also serves asa relief vent for any backpressure. It must be freefrom offsets to allow freemovement of air. Under thismain vent are other differenttypes of vents .

3. INDIVIDUAL VENT

Sometimes referred to as back vent. It IS that p ortton ol the vent pipe which serves a single trap. It should be connected close to the ftx tuw uap as possible, 11 should be located underneath and back of the fixture and 11 must be connected to the main vent above the overflow line of the fixture.

4. UNIT VENT

This is that portion of the vent p1pe wh1cll vent1late two .:ixture traps. Usually used in apartments arranged bact.to back.

5. CIRCUIT OR LOOP VENT

This is employed where two or more fixture traps are installed on a horizontal soil or waste branch. The use of circuit vent generally reduces the cost of the plumbing installation.

6. RELIEF VENT

Is installed to ventilate the soil and waste pipe and the connecting branches other than the fixture traps. Relief vent is provided when waste branches are circuit vented.

7. YOKE OR BY-PASS VENTILATION

On a long vertical soil pipe a relief vent is installed at 3 to 5 floor intervals. In this case, the relief vent is referred to as the YOKE or by-pass ventilation.

8. WET

VENTILATION

Refers to the vertical pipe of the plumbing systemused as ventilation of the plumbing, installation andfixture traps which at the same time receives andconvey liouid waste discharge from the fixtures.Widely used for small groups of bathroom fixturesparticularly on a one or two storey residentialhouses.

9. LOOPED VENT

Used on Fixtures in a room away from partitions. Common to beauty parlors, barbers shops and dental clinics and surgical rooms.

AR224 – BUILDING UTILITIES 1PLUMBING AND SANITARY SYSTEMS

RSW PR - 02“SANITARY DRAINAGE SYSTEMS”

( PLUMBING TRAPS AND VENTILATIONPIPING SYSTEMS )

DATE GIVEN : 10/09/14DATE DUE : 10/16/14DATE SUB. : 10/16/14

REFERENCE:Architectural UTILITIES· 1, Plumbing And Sanitary, The New Ladder Type Curriculum,

GEO'RGE SALINDA SALVAN, 1986

STUDENT: INSTRUCTOR:

AQUINO JR. LUVIMIN A. ARCH. IRENE G. FLORENDO