BU MIDTERM

Drainage System

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.

Building Sewer

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

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.

Stack

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

Soil Stack

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

Waste Stack

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

Branch

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

Vent

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

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.

Cleanout

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

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.

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.

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.

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.

305 mm

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

450 mm

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

450mm

For underfloor cleanout what is the required vertical clearance

750 mm

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

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

Gravity Drainage

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

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.

VENT

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

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.

TRAP SEAL LOSS

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

Siphonage

Is the result of minus pressure in the drainage system.

Back Pressure

Is the result of plus pressure in the drainage system

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.

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.

STACK VENT

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

VENT STACK

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

WET VENT

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

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.

CONTINUOUS VENT

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

BACK VENT

A vent installed on the sewer side of a trap.

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.

LOOP VENT

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

INDIVIDUAL VENT

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

BRANCH VENT

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

COMMON VENT

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

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.

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.