CHAPTER 7 — EXCRETA DRAINAGE SYSTEM

Excreta Drainage Piping

______________ shall be cast iron, ductile iron, galvanized steel, galvanized wrought iron, lead, copper, brass, Series 1000 PVC DWV, Extra-strength vitrified clay pipe or other approved materials having smooth and uniform bore.

galvanized wrought iron,

galvanized steel pipe,

152 mm

No _____ or _____ shall be used underground and shall be kept at least _____ above ground.

ABS,

PVC DWV piping

_____ and _____ piping installations shall be used in high-rise buildings, provided that its use shall be the discretion of the Master Plumber/Designer and also with the full consent of the owner.

vitrified clay pipes or fittings,

at least 0.3 meter.

No ______ for building drain or sewer shall be used above ground or whenever piping is pressurized by a pump or ejector. They shall be kept _____ below finish ground level.

cast iron,

malleable iron,

lead, brass,

copper,

ABS,

PVC,

vitrified clay

Drainage fittings shall be of _____, _____, _____, _____, _____, _____, ______, or other approved materials having a smooth interior waterway of the same diameter as the piping served and all such fittings shall be compatible with the type of pipe used.

recessed drainage type

Fittings on screwed pipe joints shall be of the _____.

Burred ends

_____________ shall be reamed to the full bore of the pipe.

two (2) percent or 21 mm/m grade

The threads of drainage fittings shall be tapped to allow _____.

1

Max. Trap Loading (DFU): 32mm pipe

2

Max. Trap Loading (DFU): 38mm pipe

4

Max. Trap Loading (DFU): 51mm pipe

6

Max. Trap Loading (DFU): 76mm pipe

8

Max. Trap Loading (DFU): 102mm pipe

Self-service laundries

Exception to Max. Trap Loading

total of all fixture units

The minimum sizes of vertical and/or horizontal drainage pipings shall be determined from the _______________ connected thereto.

six (6) fixture units

Drainage piping serving batteries of appliances capable of producing continuous flows shall be adequately sized to provide for peak loads. Clothes washers in groups of three (3) or more shall be rated at _____ each for the common horizontal and vertical waste pipe sizing.

six (6) fixture units

Water closets shall be computed as _____ when determining septic tank size.

Because fixture discharge may be inadequate to maintain self-scouring properties

Why is increasing of trap sizes prohibited?

up to 0.47L/s

Liters per second continuous flow of 1 fixture unit

0.50L/s to 0.95L/s

Liters per second continuous flow of 2 fixture units

1L/s to 1.89L/s

Liters per second continuous flow of 4 fixture units

1.95L to 3.15L/s

Liters per second continuous flow of 6 fixture units

two (2) fixture units

For a continuous flow into a drainage system, such as from sump pump or ejector, air conditioning equipment or similar devices, _____ shall be allowed for every 0.063 L/s of flow.

0.063 liter per second (lps or L/s)

1 Gallon per minute (gpm) in L/s

inlet fittings

Drainage piping shall be provided with approved _____ for fixture connections, correctly located according to the size and type of fixture proposed to be connected.

single vertical drainage pipe,

double sanitary tee or double wye,

1/8 bend

Two fixtures set back-to-back, or side-by-side, within the distance allowed between a trap and its vent, may be served by a _____, provided that each fixture wastes separately into an approved double fitting, such as _____ and _____ having inlet openings at the same level.

22 '12'' or 1/16 bend,

45° or 1/8 bend

60° or 1/6 bend

Changes in direction of drainage piping shall be made by the appropriate use of approved fittings and shall be of the angles presented by a ______, _____, and ______ or other approved fittings of equivalent sweeps.

45 or 60 degree wye,

combination wye,

1/8 bend,

sanitary tee or sanitary tapped tee

equivalent sweeps

Horizontal drainage branch lines, connecting with a vertical stack, shall enter through _____ branches, _____ and _____ branches, _____ or other approved fittings of ______.

at least two (2) pipe sizes

Double sanitary tees may be used when the barrel of the fitting is _____ larger than the largest inlet, (pipe sizes recognized for this purpose are 51, 64, 76, 89, 102, 114, 127 & 152 mm diameters, etc.)

45-degree wye,

combination wye and 1/8 bend

equivalent sweep

Horizontal drainage lines connecting with other horizontal drainage line shall enter through _____ branches, _____ and _____ branches or other approved fittings of ______.

45-degree,

equivalent sweep

60-degree

Vertical drainage lines connecting with horizontal drainage lines shall enter through _____ branches or other approved fittings of ________. _____ branches or offsets may be used only when installed in a true vertical position.

upper terminal,

15 meters,

15 meter length

Each horizontal drainage pipe shall be provided with a cleanout at its _____ and each run of piping which is more than _____ in total developed length shall be provided with a cleanout and at every _____ or a fraction thereof.

38mm size of pipe - 38mm cleanout - 11-1/2 tpi

51mm size of pipe - 38mm cleanout - 11-1/2 tpi

64mm size of pipe - 64mm cleanout - 8 tpi

76mm size of pipe - 64mm cleanout - 8 tpi

102 and larger - 89mm cleanout - 8 tpi

CLEAN OUTS (From Table 7-4)

38mm

Size of cleanout for a 38mm and 51mm pipe?

11-1/2

Size of threads per 25.4mm for 38mm and 51mm pipe with 38mm cleanout?

64mm

Size of cleanout for 64mm and 76mm pipe?

8

Size of threads per 25.4mm for 64mm and 76mm pipe with 64mm cleanout?

89mm

Size of cleanout for 102mm and larger pipe size?

8

Size of threads per 25.4mm for 102mm and larger pipe size with 89mm cleanout?

less than I.5 meter

Cleanouts may be omitted on a horizontal drain line _____ in length unless such line is serving sinks or urinals.

seventy two (72) degrees

less from the vertical line (or an angle 1/5 bend)

Cleanouts may be omitted on short horizontal drainage pipe installed at a slope of _____ or _____.

two-way cleanout

An approved type of _____ fitting, installed inside the building wall near the connection between the building drain and building sewer or installed outside of a building at the lower end of the building drain and extended to grade, may be substituted for an upper terminal cleanout.

one hundred and thirty-five (135) degrees.

An additional cleanout shall be provided on a horizontal line with an aggregate offset angle of direction exceeding _____.

vertically

Each cleanout shall be installed so it opens in the direction of flow to allow cleaning of the soil or waste line or at right angles thereto and, except in the case of wye branch and end-of-line cleanouts, shall be installed _____ above the flow line of the pipe.

cleanout extension,

ninety (90) degrees cleanout extension

Each _____ shall be considered as drainage piping and each _____ shall be extended from a wye type fitting or other approved fitting of equivalent sweep.

outside

Each cleanout for an interceptor shall be _____ of such interceptor.

above grade

Each cleanout, unless installed under an approved cover plate, shall be _____, readily accessible and so located to serve the purpose it is intended. Cleanouts located under cover plates shall be installed to provide the clearances and accessibility required by this Section.

not less than 305 mm

Each cleanout in piping 51 mm or less in size shall be installed so that there is a clearance of _____ in front of the cleanout.

not less than 0.45 m

Cleanouts in piping larger than 51 mm shall have a clearance of _____ in front of the cleanout.

less than 0.45 meter,

0.75 meter

Cleanouts in underfloor piping shall be extended to or

above the finished floor or shall be extended outside the building when there is _____ vertical and _____ horizontal clearance from the means of access to such cleanout.

more than 6.1 meters

No underfloor cleanout in any residential occupancy shall be located _____ from an access door, trap door or crawl hole.

cleanouts

Cleanouts shall be provided for pressure drainage systems.

Countersunk cleanout plugs

_____ shall be installed where raised heads may cause hazard to passing personnel or vehicles.

hubless blind plug

When a _____ is used for a required cleanout, the complete coupling and plug shall be accessible for removal or replacement.

not less than 2% or 20 mm/m,

Horizontal drainage piping shall be run in practical. alignment and at a uniform slope of _____ towards the point of disposal.

not less than one 1 percent or 10 mm/m

Where it is impractical due to the depth of the

street sewer or to adverse structural features or to some irregular arrangements of affected building or structure to obtain a slope of 2 percent or any such pipe or piping 102 mm or larger in diameter may have a slope of _____ when first approved by the Administrative Authority.

public sewer or private sewage disposal system

Where practicable, all plumbing fixtures shall be drained into the _____ by gravity.

backwater valve

Drainage piping serving fixtures which have flood level rims located below the elevation of the nearby upstream manhole invert of the public sewer serving such drainage piping shall be protected from backflow of sewage by installing an approved-type.

above

Fixture installed _____ such elevation shall not discharge through the backwater valve.

watertight sump or receiving tank

Drainage piping serving fixtures located below the crown level of the main sewer shall discharge into an approved _____, the sewage or other liquid wastes shall then be lifted and discharged into the building drain or building sewer by approved ejector, pump or other equally efficient mechanical device.

not be less than 50.8 mm

The minimum size of any pump discharge or any discharge pipe from a sump having a water closet connected thereto shall _____ diameter.

Gate valve, water meter, check valve

The right order of house service connection.

Pump, gate valve, check valve

The right order of vertical discharge line from ejector pumps.

backwater or swing check valve and gate valve

The vertical discharge line from such ejector, pump or other mechanical device to a horizontal drain line shall be provided with an accessible _____ close to the connection with the horizontal line.

discharge side

The gate valve shall be located at the _____ of the backwater or check valve

Two (2) fixture

Building drain or building sewer receiving discharge from any pump or ejector shall be adequately sized to prevent overloading. _____ units shall be allowed tor each 0 .063 L/s of flow or each GPM flow.

water-tight masonry pit

Backwater valves, gate valves, motors, compressors, air tanks and other mechanical devices required by this Section shall be located where they will be accessible for inspection and repair at all times and, when not exposed, shall be enclosed in a _____ fitted with an adequately sized removable cover.

concrete, metal,

coated internally and externally

Sumps and receiving tanks shall be watertight and shall be constructed of _____ or other approved materials. If constructed of poured concrete, the walls and bottom shall be adequately reinforced and designed according to recognized acceptable standards. Metal sumps or tanks shall be of such thickness to serve their intended purpose and shall be properly _____ to resist corrosion.

automatically,

dual pumps or ejectors

All such sumps and receiving tanks shall be _____ discharged and, when rated as "public use" occupancy, shall be provided with _____ arranged to function independently in case of overload or mechanical failure.

51 mm

The invert of the lowest inlet to the tank shall have a minimum distance of _____ above the high water or "starting" level of the pumping operation.

51 mm

Minimum vent pipe size for sumps and tanks.

air-operating sewage ejector

No vent from an _____ shall combine with other vents.

not less than 3 kg

Air tanks shall be proportioned to be of equal cubical capacity to the ejector connected therewith where there shall be maintained an air pressure of _____ for each meter of height the sewage is raised.

subsoi1 drainage system

When _____ is installed, it shall be initially discharged into an approved receiving tank and discharged in a manner satisfactory to the Administrative Authority.

within 2.4 meter

Exceptions:

1. Single family residences.

2. Stacks receiving the discharge from less than (3) stories of plumbing fixtures.

Fixture outlets shall not be connected to the horizontal excreta drainage piping system _____ of any vertical to horizontal change of direction of a stack containing suds-producing fixtures. Bathtubs, laundries, washing machine standpipes, kitchen sinks and dishwashers shall be considered suds-producing fixtures.

four (4) water closets or 6 fixture unit traps,

three (3) water closets or six (6) fixture unit traps

Only _____ are allowed on any vertical pipe or stack; and not to exceed _____ on any horizontal branch or drain.

0.8

For one (1) percent or 10.4 mm/m slope, multiply horizontal fixture units by a factor of _______.

32 mm

one-half (1/2)

The diameter of an individual vent shall not be less than _____ nor less in size than _____ the diameter of the drain to which it is connected.