1 Introduction

Question 1

Objectives of plumbing

Answer 1

1) supply water to different parts of the building 2) remove the discharged human waste and other substances from building and into sewer

Question 2

Conditions for effective water supply to building

Answer 2

1) provide sufficient amount of water to building

2) prevent back flow of used water into water supply system

Question 3

Drainage system should accomplish the ff

Answer 3

1) fast removal of waste with minimum probability of leakage and stoppage of drains
2) prevent entry of vermin and other obnoxious gases into house via piping system

Question 4

Drainage system requirements

Answer 4

1) must be vented
2) must have pipe joints well fitted
3) must have suitable trap to prevent back flow of gases
4) must have ventilation pipe to transfer gases unto atmosphere where it does no harm to human health
5) must have accessible cleanout in case of repair
6) drainage pipe should be graded or inclined for a downward gravity flow of water towards main sewer

Question 5

Waste discharged by water closet

Answer 5

solid waste

Question 6

Waste discharged from various fixtures

Answer 6

liquid waste

Question 7

Pipe which conveys waste other than those from water closet

Answer 7

waste pipe

Question 8

Pipe which conveys waste other than coming from water closet and other fixtures

Answer 8

soil pipe

Question 9

Drainage system in acronyms

Answer 9

D - drainage of solid waste
W - drainage of waste from other fixtures
V - ventilation of piping system

Question 10

Space between water outlet (opening of water supply fixture) to flood level of fixture (i.e. sink)

Answer 10

air gap

Question 11

Unwanted flow of water in reverse direction

Answer 11

back flow

Question 12

Back flow of used water from a plumbing fixture unto water supply pipe due to negative pressure in pipe

Answer 12

back siphonage

Question 13

Group of plumbing fixtures which use a common waste line

Answer 13

battery of fixtures

Question 14

Synonym for faucet

Answer 14

bib, cock, tap, plug, “gripo”

Question 15

Plate or flange covering/closing end of pipe

Answer 15

blind flange

Question 16

Controlled pipe outlet for releasing water; pressure release system for releasing water

Answer 16

blow off valve (BOV); dump valve; bypass valve

Question 17

Any other pipe in piping system other than main branch or stack

Answer 17

branch

Question 18

Length of soil or waste pipe corresponding to storey height; no less than 2.40 meters; within which horizontal branches of building are connected to

Answer 18

branch interval

Question 19

Vent connecting on one or more branches to main vent stack or stack vent

Answer 19

branch vent

Question 20

Resilient mastic compound often having bituminous, silicone or a rubber base usually used for waterproofing, seal cracks, fill joints and prevent leakage

Answer 20

calking; caulking

Question 21

A branch vent which connects multiple number of traps on a horizontal branch to the vent stack

Answer 21

circuit vent

Question 22

Vertical pipe whose upper portion is a vent and lower portion is a drain

Answer 22

continuous vent

Question 23

Fixture combining one sink and tray or more than one set in one vent/one unit

Answer 23

combination fixtures

Question 24

System of waste piping embodying the horizontal wet venting of one or more sinks and floor drains by means of common waste and vent pipe sized large enough for movement of air above flow line of drain

Answer 24

combination waste and vent fixtures

Question 25

A drain from two or three fixtures connected to a single trap; also called a dual vent; connects at junction of two fixtures & serves as vent for both fixtures

Answer 25

common vent

Question 26

Physical connection between two otherwise separate piping system (i.e. potable water source with contaminated water source) wherein water may flow from one system to the other depending on pressure difference between two systems

Answer 26

cross connection

Question 27

Extended portion of pipe that is closed at one end permitting stagnation of water or air

Answer 27

dead end

Question 28

Length along centre of pipe and fitting

Answer 28

developed length

Question 29

Refers to nominal internal diameter (ID) of pipe; except for brass and copper tube where term refers to outside diameter (OD) of pipe

Answer 29

diameter

Question 30

System includes all piping within the public or private premises that conveys sewage, rainwater, liquid waste to a legal point of disposal; does not include private or public sewerage system treatment or disposal plant

Answer 30

drainage system

Question 31

Vent that does not carry water or water borne wastes

Answer 31

dry vent