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41 Terms

1
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Drainage System

A system of pipes, traps, and other apparatus for conveying sewage, waste water, or rainwater to a public sewer or a private treatment facility.

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Building Sewer

A drain connecting a building drain to a public sewer or private treatment facility.

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Building Drain

The lowest part of a drainage system that receives the discharge from soil and waste stacks inside the walls of a building and conveys it by gravity to the building sewer.

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Stack

A vertical waste pipe or vent pipe serving a number of floors.

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Soil Stack

A vertical soil pipe that carries water and solids into the sewer.

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Waste Stack

A vertical waste pipe that carries waste water from sinks, washing machines, showers, baths, and other appliances.

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Branch

A drain connecting one or more fixtures to a soil or waste stack.

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Vent

A pipe connecting a drain near one or more traps to a vent stack or stack vent.

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Trap

A U-shaped or S-shaped section of drainpipe that forms a seal to prevent the passage of sewer gas without affecting the normal flow of waste water or sewage.

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Cleanout

A pipe fitting with a removable plug that provides access to a soil or waste pipe for inspection or cleaning.

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Changes in direction of drainage piping

Made by the use of approved pipe fittings and shall be of the angles presented by a 22 1/2° bend, 45° bend, 60° bend, or other approved fittings of longer sweeps.

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Allowable Pipes for Drainage

Cast iron, ductile iron, galvanized steel, galvanized wrought iron, lead, copper, brass, Series 1000 PVC DWV, extra-strength vitrified clay pipe.

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Suds Relief

Fixture outlets shall not be connected to the horizontal excreta drainage piping system within 2.4 meters of any vertical to horizontal change of direction of a stack containing suds-producing fixtures.

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Excreta Drainage

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

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305 mm

For cleanout having 51mm piping or what is the required clearance horizontally

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450 mm

For cleanout having larger than 51mm piping what is the required clearance horizontally

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450mm

For underfloor cleanout what is the required vertical clearance

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750 mm

For Underfloor cleanout what is the required horizontal clearance from the means of access

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2.4 m

Drainage connections shall not be made into a drainage piping system within a vertical to horizontal change of direction of a stack containing suds- producing fixtures

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Gravity Drainage

Where practicable, all plumbing fixtures shall be drained into the public sewer or private sewage disposal system by gravity.

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VENT SYSTEM

A system of pipes supplying a flow of air to or from a drainage system or providing a circulation of air within the system to protect trap seals from siphonage and back pressure.

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VENT

A pipe connecting a drain near one or more traps to a vent stack or stack vent.

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ATMOSPHERIC PRESSURE:

the pressure exerted by the earth's atmosphere at any given point, usually expressed in terms of the height of a column of mercury.

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TRAP SEAL LOSS

Can be attributed to inadequate ventilation of the trap and the subsequent minus and plus pressures inside the system.

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Siphonage

Is the result of minus pressure in the drainage system.

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Back Pressure

Is the result of plus pressure in the drainage system

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Evaporation

the process by which an element or compound transitions from its liquid state to its gaseous state below the temperature at which it boils; in particular, the process by which liquid water enters the atmosphere as water vapor.

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Capillary Action

A manifestation of surface tension by which the greater adhesion of a liquid to a solid surface than internal cohesion of the liquid itself causes the liquid to be elevated against a vertical surface.

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STACK VENT

The extension of a soil or waste stack above the highest horizontal drain connected to the stack.

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VENT STACK

A vertical vent installed primarily to provide circulation or air to or from any part of a drainage system.

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WET VENT

An oversized pipe functioning both as a soil or waste pipe and a vent.

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FRESH AIR INLET

A vent pipe admitting fresh air into the drainage system of a building, connected to the building drain at or before the building trap.

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CONTINUOUS VENT

A vertical vent formed by a continuation of a drain line to which it connects.

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BACK VENT

A vent installed on the sewer side of a trap.

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CIRCUIT VENT

A vent serving two or more traps and extending from in front of the last fixture connection of a horizontal branch to the vent stack.

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LOOP VENT

A circuit vent that loops back and connects with a stack vent instead of a vent stack.

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INDIVIDUAL VENT

A vent connecting a fixture drain to a main or branch vent.

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BRANCH VENT

A vent connecting one or more individual vents with a vent stack or stack vent.

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COMMON VENT

A single vent serving two fixture drains connected at the same level.

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RELIEF VENT

A vent that provides circulation of air between a drainage and a venting system by connecting a vent stack to a horizontal drain between the first fixture and the soil or waste stack.

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3 m

Vertical vent pipes for outdoor installations shall extend to at least a meter distant from any part of the roof that is used tor other purposes and shall extend not less than 2.1 meter above such roof and shall be securely stayed.