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Phase 6 Gas > Gas > Flashcards

Gas Flashcards

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1
Q

who is responsible to ensure all tools + equipment used on gas are in good conditions and working properly

A

responsibility lies within the installer who should be trained in a competent person

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2
Q

name of regulations that deals with personal safety

A

health and safety welfare act

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3
Q

main constitute of gas + natural gas

A

LPG = propane natural gas = methane

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4
Q

2 Reasons Why appliance could emit carbon monoxide as poc

A

lack of oxygen poor ventilation, flame chilling equals debris on the burner flame touching the heat exchanger

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5
Q

flue size is determined by various factors list them

A

appliance rated heat input, length of flue horizontal runs, resistance (turns and bends), height of flue

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6
Q

what key safety device must be fitted to a fanned draught open flue to prevent burner ignition should the fan fail

A

a fan sensing device is fitted to ensure burner does not turn on if fan is not working

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7
Q

name for points to be recorded on a notice of Hazard for a hazardous installation

A

name of issuer, name of customer, address of premises, gas type, hazard type, appliance

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8
Q

state one service that gas pipe work must not be installed alongside in service shaft

A

gas pipe must not be installed in duct/ services shaft where ventilation or air conditioning air

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9
Q

what is the permitted working pressure loss for natural gas + LPG between meter outlet plus appliance inlet

A

LPG = appliances on full 2.5 bar Max, natural gas = appliances on full 1 bar Max

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10
Q

what is meant by heat input of a gas appliance

A

volume of gas used in one hour in kilowatts

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11
Q

name three types of gas fires

A

live inset, radiant, radiant convector, flueless

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12
Q

what is the minimum ventilation for tumble dryer

A

less than 3kw

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13
Q

list two functions of a flue on a gas appliance

A

deposit poc to outside atmosphere, help maintain proper combustion

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14
Q

name three points to determine whether an appliance needs a flue

A

appliance heat rated input, volume of room, length of continuous use if over 7kw

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15
Q

how much ventilation is required for room sealed appliance (boiler 12kw) in compartment vented directly to outside 450mm cubed/kw

A

12 x 450 = 5400mm squared

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16
Q

what regulations refers to ventilation requirements for domestic gas appliance

A

Tec reg doc f

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17
Q

where are the concentration of gases between the lower and upper limits in a room/confined/ enclosed area may cause an explosion

A

where are the concentration of gases between the lower and upper limits in a room/confined/ enclosed area may cause an explosion. lower 5% upper 15% flammability limits

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18
Q

what elements of Fire are removed restricted smothered by a fire extinguisher

A

oxygen + heat

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19
Q

what is the function of the primary air port on a pre aerated burner

A

provide air for combustion

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20
Q

explain why it is necessary to carry out combustion testing on gas appliances

A

because incomplete combustion will lead to poc being carbon monoxide

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21
Q

name for key points recorded on declaration of conformance

A 
name of installer,
 name and address of customer, 
 date plus time, 
 work carried out, 
 ventilation conformance
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22
Q

describe the requirements for sitting of an emergency control valve in a flat or compartment where meter is remotely located notice must indicate what action must be taken

A

emergency control valve should be located near as possible to point supply enter flat, should be accessible and marked

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23
Q

calculate the size of pipe required to deliver 22kw, 15m calorific value is 11.6

A

22 / 11.6 = 1.9 needed over 15m answer to 22mm pipe

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24
Q

why would you fit an anti tilt device (stability bracket) to a gas cooker

A

this is fitted to a gas cooker that has drop down doors

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25
Q

min ventilation required if more than one flueless appliances fitted in the room

A

must be at least 13000 mm squared of ventilation when more than one flueless appliance

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26
Q

list two safety devices on a sealed central heating system

A 
safety valve
expansion vessel
 boiler stat 
 hi limit stat
 gauge
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27
Q

list two functions of a flue

A

deliver poc to outside atmosphere
safety
help maintain proper combustion

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28
Q

name 4 parts of an open flue on a gas appliance

A

primary flue
draught diverter
secondary flu
terminal

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29
Q

how much ventilation required for 30 kW open flue boiler air allow 450

A

30 x 450 = 13500 mm squared

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30
Q

name three methods to reduce heat loss on with flues

A

used double lined flue
keep flue inside
insulate
keep the flu short as possible

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31
Q

list two main checks carried out prior to installation

A 
CE mark
 right gas 
 ventilation 
 soundness test 
 gas pressure 
 appliance rated pressure
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32
Q

primary way of identifying gas content in a gas cylinder

A

collor on bottle
colour of bottle
label on bottle

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33
Q

what regulation must be referred to when installing a gas appliance over 60 kW

A

industrial/ commercial

IS820 deals with gas insulation over 60 kW

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34
Q

state volume of air required for complete combustion of 1 cubic metre of natural gas

A

10 m cubed or 10 - 1

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35
Q

what is the purpose of flame retention whole used on some gas cookers

A

prevent frame lift

keep pilot burning

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36
Q

what is meant by pre aerated flame

A

this means that some or all of air for combustion is provided before the gas leaves the burner

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37
Q

if gas installer discoveries a gas leak that cannot be repaired immediately what must they do

A

with customers permission isolate gas supply at the metre until it made safe if you’re not permitted by customer to isolate gas supply declaration of non conformance issued. ring board gais inform them of unsafe installation

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38
Q

name four key points that must be recorded on a declaration of conformance

A

installers name
customer’s name and address
time + date of work carried out
ventilation

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39
Q

name three types of pressure reading that can be taken on a gas installation

A

standing pressure
working pressure
appliance burner pressure

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40
Q

what is the procedure for checking gas rate when there is no metre present

A

check injector size to manufacturer size check inlet pressure plus pressure at burner

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41
Q

what is the minimum required diameter flue pipe suitable for DFE gas fire

A

minimum size for the who is 175 mm/7 in across axis of flu

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42
Q

minimum ventilation required for a cooker fitted in a bed sitting room

A

13000 mm squared

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43
Q

list two safety devices found on a sealed heating system

A 
safety valve
 expansion vessel 
 boiler stat
 hi limit stat
 gauge
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44
Q

with who does responsibility lie with to ensure tools equipment using gas installation are in good condition and are complete with safety guards where appropriate

A

responsibility lies with the installer who should be properly trained and competent

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45
Q

building regulations tech document l deals with

A

part L deals with conservation of fuel and energy

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46
Q

name the main constituent of natural gas

A

methane

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47
Q

what is the purpose of an injector

A

gas enters the burner tru injector orifice to provide exact measurement of gas

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48
Q

list two reasons why an appliance could emit carbon dioxide as a product of combustion

A
  1. interference with flame (flame chilling)
    debris on the burner flame touching the heat exchanger
  2. Lack of oxygen insignificant ventilation lack of primary air
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49
Q

explain why it is necessary to do combustion test on a gas appliance

A

it is done because incomplete combustion will result in carbon monoxide being produced

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50
Q

blue size is determined by many factors list them

A

appliance heat input
height of flue
resistance of flow
total length of horizontal runs

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51
Q

in relation to flue gases + air for combustion what a difference between room sealed + open flue appliances

A

room sealed = this appliance take all of it air for combustion from outside atmosphere
open flue = this appliance takes air for combustion from the room the appliance is in

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52
Q

what ventilation is required at low-level per kilowatt for open flued boiler in air compartment which is vented into the room

A

1800 mm squared

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53
Q

what is minimum height of an open flued terminal exiting through a roof with a pitch not more than 45°

A

600 mm less than 45°, 1000mm greater than 45°.

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54
Q

what must be maintained when gas metre/pipe/fitting is removed or replaced

A

electrical continuity must be maintained

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55
Q

what is the difference between hazardous + substandard Insulations

A

hazardous= e.g gas heat
something that could kill injure a person or property
substandard = not client with IS813 standards + regulation/ not installed properly EG clips wrong fuse not sleeved no brackets

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56
Q

name four key points recorded on a declaration of conformance

A 
installers name/company
 customer's name + address
 appliance installed 
 soundness test performed 
 ventilation details
 time + date of work 
 signature of installer + customer
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57
Q

what is Max recommended distance between brackets on copper pipe 15mm horizontal and vertical

A

1.2 m and 1.8 m

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58
Q

how would you find working pressure going to a boiler

A

a gauge should be connected to the inlet test point when appliance is on full

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59
Q

what extra safety requirements considered when installing cookers with drop down oven doors

A

these cookers must be installed with a stable bility device such as the stability bracket, safety chain

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60
Q

what is the purpose of a fuse for heating system what size should it be

A

protection for gas boiler fuse size 3 amps

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61
Q

name two rooms where open flue central heating boilers can’t go

A

bathroom shower room domestic garage

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62
Q

minimum ventilation required for cooker fitted in a bed sitting

A

13000 mm squared

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63
Q

minimum height of a flue exiting through a roof pitch greater than 45° and less than 45°

A

1000mm for greater than 45° and 600mm for Less Than and 45°

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64
Q

commissioning a gas cooker list main checks

A 
all safety devices work 
 burners are good condition 
 CE mark on appliance 
 ignition system 
 ventilation
 FS devices are working
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65
Q

what needs to be done with gas installation installed before current standards

A

bring it up to current standards

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66
Q

who gets a declaration of conformance

A

everyone who installation conforms with standards + regulations set by is813

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67
Q

who gets a declaration of conformance

A

everyone who installation conforms with standards + regulations set by is 813

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68
Q

minimum height of a ladder has to rise above the place of landing

A

minimum of 1.1 m

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69
Q

regulation tech document l deals with

A

conservation of fuel + energy

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70
Q

main continuity bulk LPG

A

propane

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71
Q

main continuity of bulk LPG

A

propane

72
Q

purpose of flame retention holes on some gas burners

A

prevent flame lift/ keep main pilot light burning

73
Q

function of primary airport on a pre aerated burner

A

provide air for combustion

74
Q

treating dad digital combustion Analyser can detect

A

carbon dioxide
carbon monoxide
nitrous oxide
oxygen

75
Q

four major components of natural draught open flue system

A

primary flue drafted diverter secondary flue terminal

76
Q

when gas supply is located in same duct as electrical cables what must be done

A

space inside Plus out insulate 35mm space for maintenance

77
Q

why would you purge LPG different than natural gas

A

you would Purge LPG to outside atmosphere due to its density in comparison to air air = 1 LPG = 1.5

78
Q

what method is used to ensure gas appliance is actually achieving it’s rated heat input

A

performance test

79
Q

2 signs of open flue gas appliance is dangerous

A

soot, condensation, in correct flame

80
Q

minimum vent for tumble dryer

A

6500 m squared

81
Q

primary way of determining type of gas contained in cylinder

A

colour of the bottle
collor on the bottle
labels on the bottle

82
Q

duty of employer set down in the safety health + welfare Work Act

A

employer duty is to provide a written statement of its general policy with respect to health + safety at work of its employees

83
Q

explain what is meant by relative density of gas

A

this is the weight of a given volume of gas to that of same volume of air weight of gas compared to that of air

84
Q

what is the purpose of flame retention holes

A

prevent flame lift

keep pilot flame burning

85
Q

list two reasons why appliance code emit carbon monoxide as poc

A

lack of oxygen

flame chilling debris on boiler flame touching heat exchanger

86
Q

some combustion Analyser display carbon monoxide in PPM what does this mean

A

PPM= parts per million

87
Q

what’s the difference between open flue plus room sealed appliance

A

room sealed = takes air from outside for combustion

open flue appliance = takes air from inside room for combustion

88
Q

how much ventilation is required at low level for open flued appliance in compartment vented to the outside allow 900 mm squared kilowatt boiler 24kw

A

900 x 24 = 21600 mm squared

89
Q

name three places and open flue appliance is not permitted

A

bathroom showroom domestic garage bedroom

90
Q

list two main check to be carried out on appliance prior to installing it

A 
does it have CE mark 
 right gas for appliance
 safety devices working 
 soundness test 
 right ventilation
91
Q

incorrect warning signs + lack of signage on gas installations is a sign of what

A

sign of substandard installation

92
Q

what must be issued to customer after a hazard repaired successfully

A

declaration of conformance

93
Q

state two requirements of gas supply pipework installed behind dry lining wall

A

must be soundness tested
no compression fittings used
use cupro no fitting if possible

94
Q

how would you find the working pressure going to a boiler

A

U gauge should be fitted to the inlet test point on the boiler should be tested when boiler on full allowed (1 mbar drop)

95
Q

name two categories of space heater

A

open flue
room sealed
clueless

96
Q

name two categories of space heater

A

open flue
room sealed
flueless

97
Q

min ventilation required for tumble dryer

A

6500 mm squared + openable window

98
Q

what should be fitted to a sealed central heating system should Primary boiler start fail

A

hi limit stat

99
Q

two gas fires that have a heat exchanger

A

radiant convector
gas fire
inset live

100
Q

what is the purpose of a heat exchanger

A

increase overall efficiency of appliance allow connected heat to be admitted from heat exchanger as well is radiant heat

101
Q

what is least efficient gas fire

A

DFE decorative fuel effect

102
Q

name two types of space heating appliances that do not require a chimney

A

fan assisted open flue gas fire

condensing gas fire

103
Q

what is the most efficient gas fire

A

radiant convector gas fire

104
Q

document l deals with

A

conservation of fuel + energy

105
Q

main constituent of LPG + natural gas

A

LPG = propane

natural gas = methane

106
Q

purpose of flame retention holes

A

to prevent flame lift

to keep main flame burning

107
Q

what is function of the primary airport on a pre aerated gas burner

A

primary air port on a gas burner is to provide some or all of the air for combustion before the gas leaves the burner

108
Q

name three items a digital combustion Analyser can identify + determine in flue gases

A
  1. Carbon dioxide 2. Carbon monoxide 3. Nitrous oxide
109
Q

list four components of a natural draught open flue system

A

primary flue
draught diverter
secondary flue terminal

110
Q

minimum ventilation for copper in a bed sitting room

A

13000 mm squared

111
Q

when commissioning a gas cooker for main points to be checked

A

check ignition system
inform customer how to operate
ensure working pressure at burner is correct
clear work area

112
Q

who is entitled to a declaration of conformance

A

everyone customer who is installation + ventilation is conformance with is 813

113
Q

where a gas supply is located in same duct as electricity cables what must be done

A

must be spaced out or insulated 35mm ducts must be ventilated

114
Q

in what way would LPG be purged differently from natural gas

A

you would Purge LPG out in the outside atmosphere as is heavier than air
air = 1 LPG = 1.5

115
Q

what method is used to ensure gas appliance is actually achieving its specified rated heat input

A

performance test

116
Q

list two signs that open flue gas fire is dangerous

A

soot, condensation, unstable combustion

117
Q

what is minimum ventilation required for tumble dryers

A

6500 mm squared openable windows

118
Q

what type of safety valve is recommended on a domestic heating system

A

no2 safety valve gauge Incorporated sealed system 3 bar

119
Q

are compressed fittings allowed in concealed areas

A

no any compressed fittings should be accessible

120
Q

how to thick must the brick work be on a chimney

A

25mm minimum

121
Q

what does the H+ s welfare act provide for employees

A

employer must provide a written statement of its policy with respect to the H+ s welfare act provide a safe working environment

122
Q

what is the max shutdown time for flame supervision device fitted to decorative gas fire

A

120 seconds/2mins

123
Q

what are most common cause of carbon monoxide

A

lack of oxygen insignificant ventilation

flame chilling flame touching heat exchanger

124
Q

what is produced from incomplete combustion

A

carbon monoxide

125
Q

what are main signs of carbon monoxide

A

stain of appliance, soot, unstable combustion

126
Q

what is calorific value

A

the amount of heat released by the complete combustion of a measured volume of gas

127
Q

name 6 parts of a multifunctional gas valve

A 
pilot flame adjustment valve
 solenoid valve 
 gas pressure adjustment point 
operating button 
 inlet pressure test point
burner pressure test point
128
Q

what is flame supervision device used for

A

to prevent unlit gas passing into the combustion chamber through the burner

129
Q

when will supervision device work

A

pilot light fails to light when ignition applied main burner fails to light when ignition applied pilot lights or main burner go out after ignition

130
Q

how does supervision device work

A

by using the heat from the flame the flame acting as a conductor to complete an electrical circuit

131
Q

what are main disadvantage of flame conductance device

A

a short circuit can simulate presence of a flame EG if electrodes touch each other it will fail to shut off gas

132
Q

list three components of a multifunctional valve

A

solenoid valve
inlet pressure test point
pilot adjustment valve

133
Q

what points to consider when planning and installation

A 
pipe sizing
future installation
how many appliances
ventilation
Nat gas + LPG gas
 pipe material
resistance to fire
134
Q

what is melting point of Nat gas + LPG gas

A

Nat gas = 210°c

LPG gas = 450°c

135
Q

name four places where you can’t put carcass pipework

A

under foundations
under base footing of load bearing wall
in cavity of a cavity wall
service duct ventilated Lloyds

136
Q

name three points to consider when sizing pipe requirements

A

Max rated heat input of all appliances + add-ons length of pipework run
route of pipework

137
Q

what is minimum depth of pipework buried outside

A

minimum depth is 375 mm with 150mm of sand either side

138
Q

what must be done to pipework in concrete or driveways

A

must be sleeved also coated minimum of 25mm of crack free concrete

139
Q

what protection practice is used for mild steel pipes outside

A

two coats of bituminous paint

140
Q

when working with naked flame on existing installation what care must be taken to avoid

A

flashback to gas storage vessel

damage to decoration + combustible materials

141
Q

gas pipe going through joist should be what size

A

no greater than 1/8 of the depth of the joist holes no greater than 1/4 of depth of joist

142
Q

name two things when gas pipe runs in ducts

A
  1. must be ventilated top + bottom

2. integrity of fire resistance to be maintained

143
Q

what is temporary bonding

A

temp bonding is done so electrical continuity is maintained. At all times cable with insulated clamps at each end (jumper leads)

144
Q

when commissioning a gas appliance name for important to consider

A
  1. General condition of insulation + appliance
  2. adequate ventilation available
  3. Ability to remove pocs to outside atmosphere 4. Adequate air for the combustion process
145
Q

minimum checks to be made for new installation of a gas appliance

A 
soundness test 
 pipework purged
metre outlet working pressure 
 appliance working pressure 
 flue
 ventilation
146
Q

name 5 types of gas fire

A 
radiant
 convector radiant
live in set
 decorative fuel effect DFE 
flueless
147
Q

name three Florida open flue appliance used where no chimney exists

A
  1. fan assisted open flue gas fire
  2. Fan assisted closed flue convector
  3. condensing gas fire
148
Q

what is a closure plate what is it used for

A

a. it is a steel plate 3 - 6 mm put in front of fire with a spigot for the flue
b. It is used to change the amount of air changes in the room from 7 - 2

149
Q

what is flue size for radiant convector fires

A

125mm 5 in to cross axis of flue

150
Q

what is flue size for inset live

A

125mm 5 in Cross axis of flue

151
Q

what flue sizes for decorative fuel effect

A

175mm 7-in across axis of flu if spigot is less than a 13000 mm squared

152
Q

what is standard size of brick chimney

A

9 x 9 in

153
Q

closure plate size should be what

A

this should be 50 mm wider 25mm higher

154
Q

what distance should gas fire be off back of Builders opening

A

at least 50 mm. From the back wall

155
Q

what thickness minimum should the heart be

A

50mm

156
Q

name two types of room sealed appliance

A

radiant convector fires

convector wall heaters

157
Q

what is commonly known as a letterbox

A

hello opening in the closure plate 350mm wide 400mm high

158
Q

text before installing an open flue gas fire wall hung heater

A 
type of room.
 type of appliance.
 ventilation.
 gas connection. 
 Combustible surfaces.
 risk of injury
159
Q

safety check list pre installation gas fire

A 
does s carry the CE mark 
 is applying suitable for that gas 
 safety devices are installed 
 control tap work properly
radiants
is there a closure plate
is the flue correct suitable
160
Q

what is purpose of a flue

A

remove poc to the outside atmosphere

to maintain proper combustion

161
Q

what can affect performance of flue

A 
it's cross sectional area 
 termination point 
 number of bends 
 heat loss 
 climatic conditions 
 it's condition
162
Q

when does an appliance need a flue

A

when over 7kw

163
Q

how you determine whether or not appliance requires a flue

A

rated input of appliance
period of continuous use
room volume

164
Q

what amount of kilowatts determines whether is a domestic or commercial

A

domestic = 60 kW under

commercial = 60 kW over

165
Q

name five rooms open flued appliances can’t go

A

bathroom
shower room
domestic garage
bed sitting room

166
Q

flue termination point flat roof
greater than 1500mm from wall
less than 1500mm from wall

A

greater than 1500mm /24 in from wall

less than 1500mm/ 24 in from wall

167
Q

flue bends horizontal Max of Bend and vertical

A

horizontal 45° Max

vertical 135° Max

168
Q

what is the minimum vertical run from Fire before any bands

A

least 600 mm

169
Q

how can you prevent heat loss of flue and condensate or gases

A 
keep flue short as possible
 used twin wall flue 
 keep surfaces to calculated minimum
 insulate if necessary 
 run flue internally
170
Q

how can you protect the flu as it passes through roof floor ceiling or partition

A

sleeve the flu 25mm

in hot press are covered protected by mesh wire with 50mm air gap so nothing come in contact with flue

171
Q

flue pre-installation check

A 
discuss with customer
 checking manufacturer specs 
 check location is suitable for flue
 check if other open flue appliance is in room
 check adequate ventilation 
 check flue can be terminated correctly
172
Q

advantages of balanced flue appliance

A 
safer appliance 
 don't need to take air from room 
 easier to install 
 can insulate in any room 
minimises condensation in flue
 neater when installed
173
Q

what is minimum ventilation under building regs

A

6500 mm squared

if chimney in room 12000 mm squared

174
Q

what is adventitious ventilation

A

adventitious ventilation is air that can enter room through cracks around doors + openable windows

175
Q

4 points to consider when calculating ventilation for flueless appliance

A
  1. must communicate with outside atmosphere directly
  2. there is sufficient room volume for the proposed type of appliance
  3. note any restrictions on appliance
  4. All flueless appliance require openable window
  5. Small room require purpose provided ventilation
  6. Size of appliance in kilowatts
  7. Any other appliances flued or flueless in the room
176
Q

what is a closure plate

A

to reduce air changes in a room and control the pull of the flue

177
Q

3 types of cookers

A

free standing built in built under

Phase 6 Gas (1 decks)

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