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plumbing level 3 > pluming > Flashcards

pluming Flashcards

1
Q

performance test

A

the practice of evaluating how a system performs under a particular workload

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2
Q

S plan plus

A

S plan plus has 2 separate motorised valves, 1 for domestic and the other for central heating. these 2 valves can be independently switched

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3
Q

safe isolation

A

the process of cutting off electrical installation from the rest of the circuit and testing no current is flowing through it

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4
Q

fluid categories

A

1-wholesome water. 2-3 slight health risk. 4 significant health risk. 5 serious health risk

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5
Q

float switch

A

used to detect the level of water in the tank. the switch float on top of the surface and acts as a switch, going up and down depending on the water level. they are often used to control pump devices

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6
Q

backflow/devices

A

a valve that protects from potential harmful water from contaminating the wholesome water

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7
Q

part G

A

building regulations and guidance Part G (sanitation, hot water, safety and water efficiency

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8
Q

G3 water

A

covers issues, such as withstanding the stress of temperature and pressure increases through normal use. for instance, the use of correct pipework materials for discharging water safely

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9
Q

fill vent

A

regulates the air pressure within your homes plumbing system. they’re compatible to drain pipes which removes waste and water from your home

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10
Q

commissioning

A

the advancement of the installations from the stage of static completion to full working conditions and meet performance requirements

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11
Q

hose tap

A

hose tap union with double check valve ideally used in gardens

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12
Q

HUK1

A

air gaps with interposed cistern means a non-mechanical backflow prevention

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13
Q

BSEN806

A

This standard covers the system of pipes, fittings and connected appliances installed for supplying potable water.

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14
Q

explain the categories described in the water supply regulations 1999?
-erroneous measurements
-contamination
-undue consumption

A

erroneous measurements-this is a result of water meter being tampered with and water is,in effect, being stolen

contamination- contamination of water supplies through either inadequate back flow protection or poor maintenance

undue consumption- this is associated with a system being over sized and using more water then necessary

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15
Q

state the equipment needed to measure flow rate at an outlet?

A

flow cup

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16
Q

explain why multiple cold water storge cistern (CWSC) must be coupled or connected if they are supplying a building consuming large quantities of water

A

to avoid stagnation, it is important to create to flow through both cisterns. outlets must be connected on the opposite end to the inlets

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17
Q

state the difference between direct and indirect boosted cold water systems.

A

direct- water is boosted directly from the mains.

indirect- water is pumped from a break cistern which is fed from the main via a FOV

18
Q

state 3 mechanical back flow devices

A

-single check valve
-double check valve
-RPZ (reduced pressure zone valve)
-CA valve

19
Q

state the fluid category risk for each appliance according to water supply regulation 1999
-hose tap union
-washing machine
-rain water harvesting

A

hose tap union- fluid cate 3

washing machine-fluid cate 3
rain water harvesting- fluid cate 5

20
Q

hot water systems can be divided into two categories, centralised and localised. give a brief explanation and example of each category?

A

central- heated and distributed centrally

local- heated and distributed local to its use, above a sink single point heater

21
Q

explain how unvented system above 15liters allow for the expansion of water?

A

expansion vessel to maintain the right level of pressure in the right system

22
Q

explain 3 installation requirements of an unvented cylinder

A
  • D1 discharge pipework must be maximum 300mm.
    -D2 discharge pipework must be minimum 300mm.
    -full bore isolation valve must be installed.
    -temperature control
    -comply with regulations
    -installation of 3 tier safety system
23
Q

explain the operating principles of the following central heating components
-zone valve
-automatic by pass
-low lost header

A

zone valve- a motorised valve that will be controlled by a room or cylinder thermostat to allow the flow of hot water cylinder.

auto Matic bypass- maintains maximum flowrates through the boiler when alternative pathways are closed

low loss header- maintaining a water velocity across the primary circuit enabling independent operation of primary and secondary outlets

24
Q

state which regulation sets the provision for conservation on fuel and power?

A

part L building regs

25
Q

describe the term below in relation to heat loss in a dwelling?
-ventilation
-building fabric

A

ventilation- the number of times the air changes in a room every hour

building fabric- the rate of times

26
Q

describe two advantages of underfloor heating?

A

energy efficiency- underfloor heating system are highly energy efficient, which means they use less energy to maintain a constant temperature

reduced maintenance- less maintenance as there’s less connections

27
Q

discuss the installation requirements of a WC macerator within a dwelling?

A

-5 amp fuse
-no push fit joint on outlet
-long radius bends on the outlet
-1:40 fall from appliance to macerator
-non switchable fuse spur

28
Q

explain the working principles of ‘grey water harvesting’ and ‘rain water harvesting’

A

grey water harvesting- collects the water used in sinks, dish washers, showers and baths, and then cleans it to plumb straight back into the toilet, washing machine and outdoor taps

rain water harvesting- collect the rainwater that would otherwise flow down gutters into the drain, then re-use it within the home to flush toilets.

29
Q

explain the function of a float switch in a break cistern?

A

float switch enables the float to raise or drop to the varying water levels in the cistern which triggers the remote micro switch

30
Q

differentiate between how mechanical and non-mechanical protects against backflow?

A

-mechanical has a physical barrier to protect against backflow prevention

-non-mechanical relies on an air gap to protect against backflow

31
Q

state where the secondary return pipe-work should enter the cylinder for correct secondary circulation?

A

top 1/4 of cylinder

32
Q

state 2 components in an unvented hot water system that enables water to be discharged to a safe termination?

A

-expansion relief
-temperature relief valve
-tundish

33
Q

explain how the 3 tier temperature control safety features of an unvented hot water system protects the consumer?

A

control thermostat- controls the contents of the cylinder to 60degrees-65degrees to limit bacterial growth which can lead to legionella disease/ to safley store water for use’

manual resettable- heat thermostat cuts power to the heat source if the temperature exceeds 85-89degrees to act as a second fail safe device should the thermostat fail

temperature/pressure relief valve discharges when the temperature exceeds 95degrees to act as a 3rd safety device should anything fail

34
Q

explain why the pump is positioned after the vent and feed pipework

A

to ensure pump is installed in a neutral zone to prevent the system pumping over or pulling air into the system

35
Q

define the term boiler interlock?

A

boiler interlock is the interconnection of all controls on the system which prevents the boiler firing when it is not required

36
Q

state the regulation that sets the provisions for the ventilation of a building?

A

approved document F for building regs

37
Q

explain the installation requirements on the outlet pipe of a WC macerator

A

-long radius and 45degrees bends are used to minimise blockages
-flexible connections on the inlets and outlets to minimise blockages
-discharge pipework rises vertically within 300mm of the unit to reduce frictional

38
Q

compare the operating principles of a air source heat pump and a ground source heating?

A

a heat pump takes the available heat from the ground and increases it by putting it under pressure to use to heat the home and hot water.
an air source heat pump takes heat from the air as its drawn through the unit

39
Q

identify the 2 renewable systems that conserve water usage?

A

-rain water harvesting
-grey water harvesting

40
Q

state how a standing pressure test on a cold main would be carried out?

A

attach a pressure gauge to an open end of the cold main pipework then open the valves to the gauge, the reading should be taken when no appliances are operation

41
Q

explain how the internal components of a double check valve protects wholesome water

A

it uses a spring loaded one way valve so movement of water is only in one direction

plumbing level 3 (1 decks)

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