Guidelines_for_desingers_builders_and_heatinstallers_Booklet_2.pdf

7/27/2019 Guidelines_for_desingers_builders_and_heatinstallers_Booklet_2.pdf

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guidelines for designers /builders and heat

installers

gas pipework installations for residential properties

2


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It is a legal requirement under The Energy(miscellaneous provisions) Act 2006 that alldomestic gas works must be under taken andcertied by a registered gas installer (RGI) who is

registered with the RGII (Register Gas Installersof Ireland). This guide prepared by Bord Gis isintended to assist installers but is not to be usedas an alternative to the most up to date edition ofI.S.813.

Contents and generalinformation

Contents Page 2

The Meter box Page 3

Natural gas pipework

Gas installation pipework Page 4Pipe materials & sizing Page 5Jointing of pipes Page 8Pipework protection Page 9

Pipework from the Meter tothe buildingExtended pipework runs Page 11Installation pipework beneathfootpaths Page 12Installation pipework beneathroads & landscaped areas Page 12Polyethylene pipework Page 13

Pipework within the buildingPipes laid in oors Page 15Vertical pipe runs Page 18Dry lined walls Page 19Timber framed walls Page 20Internal pipework ducts Page 23Supports & xings Page 24

Natural gas and electricalconsiderationsGas meters & electrical elements Page 25

Electrical cross bonding Page 26

Appliance connectionsCookers / hobs and ovens Page 28Natural Gas Fires Page 29Central heating boilers Page 30Lamps Page 30External appliances Page 31

Permitted ue terminationpoints & ventilationrequirements

Flue termination guidelines Page 32Ventilation requirements Page 33

Safety for the homeowner

Safety, certicate &getting connectedImportant notice to all installers Page 35

Steps to admitting gas tonew home Page 36Commissioning the installation Page 37

Declaration of Conformance Page 39

The Irish Standards &Contact Details Page 40


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3

The meter box

Meters

Normally meters are tted in purpose designed cabinets externalto the building, (for further details see Booklet 1 of this guide).The meter location should be agreed with Bord Gis in advance of

construction commencing.

Only in certain circumstances may meters be tted inside thedwelling and in such instances care should be taken to ensurethat the location is well ventilated accessible and protected frompossible impact.

Please go to pages 35 to 39 for details on certication ofinstallation and arranging for a Natural Gas connection.

Recessed meter box

Figure 1:Gas meter box beore and

ater meter being tted

Insulation

Recessed

Meter BoxDPC

25mm min.

Concrete oor slab

Piping in concretemust be protectedfrom corrosion withwrap or PVC coating

Polystyreneinsulation

Foundation

Pipe clip

All pipe joints mustbe outside the sleeve

Sleeve

Ground Leve

Figurer 2:Typical detail o pipe through Cavity Wall


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4

Gas installation pipework

This section of the Bord Gis Technical Manual Booklet2 refers to gas installation pipework in a traditionaldomestic building. This guide has been prepared to

reect the requirements of I.S. 813:2002 DomesticGas Installations and I.S. EN 1775 1998.

For guidelines to installing Natural Gas to multi-occupancy dwellings i.e. apartments, please refer toBooklet 3.

Any person installing natural gas must be a registeredgas installer and do so in accordance with I.S. 813Domestic Gas Installations. This guide prepared byBord Gis is intended to assist installers but is not to beused as an alternative to the most up to date edition ofI.S.813.

Where gas pipework may be confused with otherpipework, it must be colour coded bright yellow(Yellow ochre - 08 C 35), indelibly marked along itsentire length with the word GAS/Marking tape.

General

Gas pipework is installed in a dwelling in order to

convey gas in a safe manner from the point wheredelivery is made by Bord Gis (usually at the meter)to connect to the various appliances, which may beinstalled inside or outside the dwelling.

In designing and installing domestic pipework everyeffort should be made to ensure that it forms arobust, serviceable element constructed within thedwelling and will continue to be serviceable andsafe for a period not less than the expected life ofother services within the building.

Typical appliances which could be provided forwhen installing pipework, include:

n Central Heating Boiler

n Water Heater

n Cooker/Oven/Hob

n Tumble Dryer

n Barbeque

n Living Flame Fire

n Decorative Lighting

Natural Gas pipework


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5

Pipe materials

Piping materials should be selected by consideringmechanical strength, appearance, corrosion potentialand cost. Copper tubing is normally used for residentialgas installation piping. Corrosion protected steelshould be considered in external locations whereimpact damage is a risk.

Material

Rigid Copper TubingSoft Copper TubingC.S.S.TMild Steel Pipe (coated)

Polyethylene Pipe

Location

Internal / External

External / Below ground only

Specications

BS 2871 Table 4 or EquivalentBS 2871 Table 4 or EquivalentBS 7838BS 1387 table 5 or Equivalent

EN 1555

Note Polyethlene Pipe may not be brought withinany dwelling. If brought above ground, polyethylenepipework must be protected against uv light, impactand sources of heat. (See gure 11).

Be Aware !

Polyethylene (PE) pipe has an extremely lowmelting point. Take care when soldering near PEpipe.

Pipe Sizing

Pipework for domestic installations should be sizedto meet the maximum combined ow rate for all theappliances installed.

Remember

n Keep elbows and tees to a minimum.

n

Each elbow or branch connection is equivalent toabout 0.5m of straight pipe.

n Use machine or spring formed bends whereverpossible.

Typical appliance Consumptions

Domestic Boiler 2.00m3/hr approx

Cooker 1.00m3/hr approx

Dryer 0.50m3/hr approx

Gas Fire 0.75m3/hr approx

Conversion Factors

1.00m3 Nat. Gas = 11kW approx

1.00m3 Nat. Gas = 37,500 Btu/hr approx

1kW = 3,412 Btu/hr

Table 1:Suitable materials or external and internal installation pipework

Tables 2 & 3:Typical appliance consumption and conversion actors

Be Aware !

The maximum pressure loss between the meteroutlet and any appliance should not exceed 1mbar (with all appliances in normal use).

If the maximum consumption ofall appliances is greater than 6m3 /hr, then alarger meter than the standard domestic meter isrequired. Please contact Bord Gis.


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Table 4:Pipe sizing or copper tubing source: I.S.813: 2002

length Tube Diameter mm - Copperm

6 8 10 12 15 22 28

m3/h Heat m3/h Heat m3/h Heat m3/h Heat m3/h Heat m3/h Heat m3/h Heat

input input input input input input inputkW kW kW kW kW kW kW

3 0.13 1.5 0.57 6.6 1.11 12.9 1.65 19.1 3.2 37 9.6 111 19.8 230

6 0.07 0.8 0.29 3.3 0.69 8.0 1.10 12.8 2.1 24 6.4 74 13.2 153

9 0.04 0.5 0.19 2.2 0.56 6.5 0.94 10.8 1.7 19 5.1 59 10.3 120

12 0.03 0.4 0.14 1.7 0.52 6.1 0.90 10.5 1.4 17 4.3 50 8.8 102

15 0.03 0.3 0.11 1.3 0.43 5.0 0.76 8.8 1.2 14 3.7 43 7.7 89

20 0.02 0.2 0.08 0.9 0.32 3.8 0.57 6.6 1.0 12 3.2 37 6.5 75

25 0.02 0.2 0.07 0.8 0.26 3.0 0.45 5.2 1.0 12 2.8 32 5.7 66

30 0.01 0.1 0.06 0.6 0.21 2.5 0.37 4.3 1.0 11 2.5 29 5.2 60

40 0.01 0.1 0.03 0.4 0.16 1.9 0.29 3.3 0.7 8 2.1 24 4.3 50

Note: 1mBar = 10 N/m2 = 0.1kPa

Effective capacity of a copper tube installation with 1.0mbar difference between the ends for a gas of relativedensity 0.6 (air = 1)

Table 5:Pipe sizing or mild steel source: I.S.813: 2002

length Tube Diameter mm - Mild Steelm (Natural Gas)

6 8 10 12 15 22 28

m3/h Heat m3/h Heat m3/h Heat m3/h Heat m3/h Heat m3/h Heat m3/h Heatinput input input input input input inputkW kW kW kW kW kW kW

3 0.32 3.7 0.88 10.2 2.31 26.8 1.65 19.1 4.7 55 14.3 166 29.7 345

6 0.15 1.8 0.58 6.8 1.54 17.9 1.10 12.8 3.2 37 9.6 112. 20.3 235

9 0.10 1.1 0.54 6.3 1.21 14.0 0.94 10.8 2.5 29 7.9 92 16.2 188

12 0.08 0.9 0.40 4.6 1.02 11.9 0.90 10.5 2.2 26 6.7 78 13.8 160

15 0.06 0.6 0.32 3.7 0.89 10.3 0.76 8.8 1.9 22 5.9 68 12.3 142

20 0.04 0.5 0.24 2.8 0.77 8.9 0.57 6.6 1.7 19 5.0 57 10.6 122

25 0.03 0.4 0.19 2.2 0.76 8.8 0.45 5.2 1.5 18 4.4 51 9.2 106

30 0.03 0.3 0.15 1.8 0.63 7.3 0.37 4.3 1.4 17 3.9 45 8.3 97

40 0.02 0.2 0.12 1.4 0.47 5.5 0.29 3.3 1.3 15 3.3 39 7.0 82


Effective capacity of a steel pipe installation with 1.0

mbar difference between the ends for a gas of relativedensity 0.6 (air = 1)


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Table 6:Pipe sizing or polyethylene pipe source: I.S.813: 2002

length Tube Diameter mm - Polyethylenem (Natural Gas)

25 mm 32 mm 63 mm

Heat m3/h Heat m3/h Heat m3/h

input input inputkW kW kW

3 97.1 8.4 189.9 16.4 1144.9 98.7

6 65.0 5.6 127.6 11.0 774.9 66.8

9 51.4 4.4 100.9 8.7 616.0 53.1

12 43.4 3.7 85.5 7.4 523.2 45.1

15 38.0 3.3 75.1 6.5 460.6 39.7

18 34.2 2.9 67.5 5.8 415.1 35.8

21 31.8 2.7 61.7 5.3 380.1 32.8

24 30.6 2.6 57.1 4.9 352.2 30.4


Discharge in a straight horizontal polyethylene pipewith 1.0 mbar difference between the ends, for gas ofrelative density 0.6 (air = 1)

Note:

1. The above tables refer to Natural Gas only.Should an installation be on a temporarysupply from an LPG tank, awaitingconnection of Natural Gas, the abovetables must be adhered to.

2. For further details in relation to pipe sizing,please consult the CIBSE Guide Section C4


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Jointing of pipes

Solder Joints

Flux should be used sparingly and only applied to thespigot part of the joint.

The joint should not be overheated.

Residual ux should be wiped from joints after beingmade.

It is known that uxed, unsoldered joints may satisfythe soundness test, therefore, nished joints shouldalways be visually examined to conrm that the solderhas run.

When making screwed joints, all threads should beclean and undamaged.

The preferred method of jointing is to use the correct

PTFE tape complying with either. BS 4375 or BS 6974.

Hemp should only be used on threaded joints inconjunction with thread sealing paste.

If for any reason paste is being used then it mustcomply with BS 6956.

Liquid detergent should never be used when leaktesting, it can cause rapid corrosion of copper.

Mechanical Joints

The use of union joints, compression ttings orscrewed joints is ONLY acceptable where they willbe readily accessible to allow correct tightening fora sound joint. They should not be used in concealedlocations eg. ducts, underoor, etc.

Copper Tube

Tube ends should be cut square and any burrs, internal

or external, removed. Tube lengths should be checkedand cleared of any foreign matter before use.

Screwed Joints

When making screwed joints, all threads should beclean and undamaged.

Hemp should only be used on threaded joints inconjunction with thread sealing compounds.

When jointing paste is used, it must comply with

B.S. 6956 and should only be applied to the externalthread. Excess paste should be wiped away oncompletion of the joint. Specially compounded jointingpastes must be used for Natural Gas - white lead basedpastes are not acceptable.

Be Aware !

n White lead based paste is not allowedn Hemp can only be used with paste complying

with BS 6956.

Sources of ignition

When making solder joints extreme care should betaken when using a blow lamp or power tool in thevicinity of combustible materials. Adequate protectionmust be used when working near timber componentsand bitumised products and polyethylene pipework.

Be Aware !

Breather membrane in the cavity of timberframed houses or the styrofoam insulation inthe cavity of block / brick dwellings is particularlyvulnerable and once ignited can spread quicklywithin the cavity. Rectication could involvecomplete dismantling of the wall with seriouscost implications for the installer.

Figure 3:Correct protection o back-ground material whencoldering copper


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Pipework protection

Mechanical

Protection against physical damage and corrosion mustbe provided where circumstances dictate. Copper tubeshould only be considered where mechanical damageis unlikely or where it will be enclosed in a mechanicallystrong protective cover.

Corrosion

Steel pipes run externally or in damp areas will requireprotection against corrosion. Copper tube will notnormally require corrosion protection when runexternally. When supporting pipework externally on ahorizontal / vertical surface the support brackets mustensure that the pipework remains clear of the surface.Any metallic pipework run underground, embeddedin a solid oor / wall or in any other corrosive location

should be protected against corrosion by one of themethods shown below.

Fire

Pipework material, jointing methods and locationsshould be chosen in order to minimise the risk of a rein the building causing a pipework failure which mightadd to the extent of the re.

Protective Wrapping

Tape wrapping is normally used at joints or on shortlengths. Any tape wrapping applied should extend atleast 25mm beyond the surface of the material likelyto cause corrosion. All surfaces should be clean anddry before the tape protection is applied. An overlap of50% is required to provide a layer of double thickness.

Be Aware !

Bends and joints on factory coated pipe shouldbe further protected by wrapping with a suitableplastic tape.

Pipe with a factory bonded coating of PVC Pipe wrapped with corrosion resistant tape

Place the pipe in a non-corrodible sleeve or duct (ventto ventilated area)

Figure 4:Methods o pipe protection


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Protection

Sleeves

Pipes passing through external, load bearing and cavitywalls should take the shortest route and be sleevedthrough the cavity.

The purpose of a sleeve is to:

n Prevent access gas entering a vulnerable space(e.g. cavity wall) in the event leakage.

n To protect the gas installation pipe againstcorrosion.

n To protect the gas installation pipe from damageby normal building movement.

n To accommodate normal expansion andcontraction of the pipework.

Sleeve Material

Sleeves should be made of a material capable ofcontaining gas. Suitable materials include polyethylene,PVC, steel and copper. The selection of the sleevematerial should reect the need for mechanicalstrength corrosion resistance and / or re retardancewhere required.

Size of Sleeve

The sleeve should be of a diameter that provides aloose t to the pipe allowing normal pipe expansion /contraction.

Be Aware !

Pipes / sleeves of dissimilar metal (steel to copper)should not contact at ANY point.

Sealing of Sleeves

Sleeves should always be sealed to the surroundingstructure with a suitable building material (e.g. mastic,mortar, etc.).

When gas pipes enter through an outside wall, the gapbetween the pipe and the sleeve should be sealed tothe pipe at the inner end of the sleeve onlywith aexible, re resisting compound. (See gure 29, page26).

Sleeves through internal walls should be sealed to thepipe at entrance and exit. (See detail below).

Be Aware !

Pipework within a sleeve should not be jointed.

Figure 5:Details o pipe sleeve through cavity wall

Any joint must beoutside the sleeve

Sleeve

Grout

Insulation


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11

Provision of customer isolation valveson extended pipework runs:

Pipework from the meter to the building.

Note:

Regardless of the routetaken by installationpipework from meterto each dwelling, thepipework must be ttedwith a customer isolationvalve as soon as the pipeenters the dwelling thatit is supplying.

See booklet 3pages 17 and 18.

Figure 8:Locating isolatingvalues in apartments

Hse 1

Hse 2

Hse 3

Hse 4

Meter Box

Wall

Meter Box or

Cabinet

Figure 6:Locating isolating values

or terraced houses

Figure 7:Locating isolating valuesor duplex units

Upper Duplex Unit

Ground Floor Unit

(See page 22)

Naturally Ventilated Basement

Internal Rising Duct

External Riser

6 Meter Cabinet

Ground Level

Meter

Manifold MeterManifold


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Installation pipework from the meter

Be Aware !

All underground pipework should be pressure tested beforeinitial wrapping or covering takes place.

Installation pipework under concrete paths, (pedestrian trafc only),should have:

Buried pipework in open soil, lawns, or under gravel paths, areaswhich can be accessed by vehicle should have:

n Minimum trench depth of 375mm.n Minimum sand or ne ll surround required in trench of

150mm.n When area can be accessed by vehicle (under tarmac,

cobblestone, etc.), the pipework must also have a protectivesleeve, (see gure 10 above).

Footpath

Protectivesleeve

Pipework should be protected againstcorrosion preferably by using pipes witha factory applied PVC coating. Wherecopper pipes are run externally exposedto the elements but supported clear ofother surfaces, corrosion protection is not

normally necessary. Consult page 9 forfurther considerations.

Pipework should not be installed underthe foundations of a building nor in theground under the base of a wall footingor foundation.

n Minimum cover of 25mm between sleeve / wrapping andconcrete nish, (see gure 9 below).

n Pipework must be placed in sleeve or have protective wrapping.

Figure 9:Meter on adjacent wall(pipework beneath ootpath)

Figure 10:Meter on adjacent wall(pipework beneath sot

ground or vehicular trac)

Meter Box

25mmcover min.

Protective cover

375 mmmin. cover

Meter Box


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Polyethylene pipework

Polyethylene (PE) Gas installation piping -Underground

PE piping can be used for underground supply of gasto a premises and is a convenient alternative to metallicpipes when used externally.

External buried PE pipework shall be constructed asfollows:

n Mechanical ttings in accordance with I.S. 265can be used on buried PE pipework.

n Any metallic joints must be wrapped with aminimum of two layers.

n PE pipework must be tested to ensure it is gastight before being covered.

n Pipework in soil should be bedded in sand or nelling to a depth of 150mm above and below thepipe. The minimum depth of cover of the pipe

required is 375mm.

Any installer engaging in

n Weldingn Electrofusionn Pipework insertion by mole or horizontal drilling

in compliance with I.S. 265 should be suitably trainedand certied (GDF1 or equivalent).

Be Aware !

PE pipework should not be laid above 375mmdept of cover regardless of cover material.

n Pipework, which may be subject to vehicularloading eg. under cobble lock driveway, shouldbe, in addition to the minimum depth of coverof 375mm, enclosed in a protective sleeve.

For correct method of entry into building aboveground level, see gure 11 below.

For correct method of entry into building belowground level, see gure 12 over-leaf.

Be Aware !

n Polyethylene pipe is not allowed within a

building.

Figure 11:

Polyethylene-metal transition(supply entering buildingabove ground level)

GRP coverxed to wall

Note:

Both GRP sleeve and GRP covermust be used on this section.

Capillarysoldered elbow

Suitably sizedcopper pipe

GRP sleeve bend

PE frommeter

Above groundtting

GRP sleeve

GRP sleevebend


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Polyethylene / Metaltransition tting (Twolayers of protectivewrapping required)

Figure 13:Below-ground transition tting with anti-shear sleeve

Note:

The polyethylene-metal transition must be suitablefor below ground applications, always consult the

supplier.

The anti-shear sleeve must be tted at all timeswhen placing transition beneath the ground.

Figure 12:Polyethylene-Metal transition (supplyentering building below ground)

Below-Ground transitiontting

Below-Ground transition tting withAnti-shear sleeve.

375mm minimumdept of cover

External Leaf

PVC coated copper

Anti-shear sleeve300mm min.

PE pipe

PEfrommeter


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Pipes laid in oors

Where the piping is to be laid on a solid oor slab, thenished oor screed must allow 25mm minimum coverover the installed pipe.

Figure 16:Sleeving pipework verticallythrough foors

Solid or screeded oors

Pipework laid in solid oors should be:

n Tested for soundness before anyprotective coating or cover is applied.

n Protected against corrosion e.g. factory bondedPVC. see g 15

n

Adequately embedded by at least 25mm belowthe nal oor nish.n Sleeved and taken the shortest practicable route

when passing vertically through a solid oor. seeg 16.

Figure 14:Pipe run on solid foor slab

Figure 15:

Pipe with actory bonded PVC

25 mmminimum

Screed

Floor slab

Floor covering

Be Aware !

Compression ttings, screwed joints shallnot be used on internal buried metallic

pipework.

All joints should be kept to a minimum

Fire resistantmastic

Sleeve

Fire resistant

mastic


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Pipes laid in oors

Suspended oors

Prior to running pipework below suspendedoors, a visual inspection should be carriedout to note the position of any electricalcables, junction boxes and ancillaryequipment, in order to safely route the gaspipes.

Where pipes are installed between joists, theyshould be correctly supported in accordancewith the following table:

Table 7:Support distances or horizontal runs opipe in suspended foors.

Material Normal size (mm) Interval Horisontal Run (m)

Copper Up to 15 1.222 1.828 1.8

Mild Steel Up to 15 220 2.525 2.5

Where pipes are laid across joists tted with oorboards or ooring grade chipboard, the pipe should

be located in purpose made notches or circular holesdrilled through the joists.

Be Aware !

Compression ttings can not be used when pipes areplaced beneath / within oors or in inaccessible positions.

Figure 17:Compression ttings.

Figure 18:Notching or providing holes in joists

Max. D/7

Max. S/4

Min. S/14

Timber Joist Depth (D)

Span (S)

Support wall Support wall

Max. Diameter d = D/4

Min. S/14

Depth (D)Max S/4

Min. distance between hole centres - 3d

Span (S)

Supportwall

Support wall


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Pipes laid in oors

Timber oors

Notches should not be made in joists of less than100mm depth.The depth of any notch should besufcient to accommodate fully the pipe or ttings, butshould not exceed 15% (approximately one seventh)of the joist depth. The notch should be located notfurther than one quarter of the span from an endsupport; it should be U-shaped when possible andno wider than necessary to accommodate the pipes.Notches should not extend across the joint betweenthe oor boards.

Figure 19:Marking areas where pipes are laid

Figure 20:Preventing the ingress o dirt / water within eeding

pipework though concealed spaces

Laying pipes

Care should be taken to prevent the ingress of dirt andwater etc. into the pipes. The bore should be examined

before installation and the open ends temporarilysealed or plugged prior to running the pipes throughdirty areas, for example, below oor boards, (see detailbelow)

Be Aware !

Care should be taken when re-xing oor boards

to prevent damage to the pipes by nails orscrews.

Location of under oor pipes should be marked onoor boards using pencil / marker or rotary stamp.


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Vertical pipe runs

Particular care is required to ensure that pipes hiddenin walls do not become a risk due to accidentaldamage or structural damage due to buildingsettlement. The ingress of gas into voids or cavitiesmust be avoided.

Vertical Pipe Runs (Only)

It is not acceptable for pipework to be run horizontallyor at any angle other than vertically in a wall chase.

Figure 21:Permitted direction o wall chase (vertical only)

Pipes in solid walls

Vertical pipes should be placed in ducts on the wallsurface with convenient access. If this is not practical,the pipework may be chased into the wall providedthat the depth of the chase does not exceed one thirdof the depth of the block or brick. In this situation, thepipe should be protected against corrosion.

Be Aware !

Such chasing is unlikely to be achieved in wallsconstructed of hollow blocks.

Protection

Where pipework is to be chased into a solid wall, it isof particular importance that high quality corrosionprotection is applied, preferably factory bonded PVC.This is to ensure that high levels of moisture within thewall do not have any detrimental corrosive effect onthe pipework.


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Gas pipework behind Dry lined walls

The installation pipework within dry lined walls shouldbe run within purpose designed channels providingadequate protection, ie. metal protection whererequired.

Where it is not possible to do this, then it is acceptable

to run the pipe on the wall surface behind the drylining provided that the pipe is:

n Securely xed and supported.

n Joints are kept to an absolute minimum.

n The pipe is protected against corrosion.

n The pipe is protected against mechanical damage,(see details below).

Be Aware !

Compression/mechanical ttings can not beused when pipes are placed behind plasterboardor in inaccessible positions.

Figure 22:Details o pipework behind dry lining

Protective 18 swg steel cover

PVC Coated Copper

Protective 18 swg steel cover

Pipe in wall behind dry lining

PVC Coated Copper

Pipe in channel behind dry lining


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Timber framed walls

The following issues need to be addressed whenconsidering running gas pipework within the walls oftimber framed construction:

n Possible interference with or weakening ofstructure members of the house frame.

n

Possibility of inadvertent damage to pipeworkwhen using plasterboard or other xings to theinner timber leaf.

n Possibility, in the event of a gas escape that:n a dangerous accumulation could occur orn the gas might migrate into the

outer cavity, before the escaping gas issmelled by the occupant.

n Possibility that natural movement of the structurecould damage the pipe.

One of the following options, chosen at design stage,can be used to ensure the avoidance of the possibilities

listed above.

Option 1Run pipework (* rigid or exible) in oor slab and exitfrom the oor to the appliance in front of the nishedplasterboard face of the wall - see gure 23 below.

Be Aware !

*Compression joints are not permitted in slab.

Option 1ARun pipework as above but exit from the oor into aseparately constructed channel to exit at the appliance.This channel must not allow gas to move into thetimber frame or cavity. Termination must be in front ofthe nished plasterboard face of the wall.

Option 2

All pipework to be run on exposed internal wallsurface or in plastic ducting on wall surface or withincupboards.

Figure 23:Appliance connection in ront o timber lea

Ground level

Plasterboard

Concrete oor slab

25mm min.

Piping in concrete

protected fromcorrosion with wrapor PVC coating

Polystyrene insulation

Copper joint must beoutside sleeve

Recessed Gas Meter Box

ExternalBrick / Block Leaf

Sleeve


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Timber Framed Walls

Option 3Run pipework in timber frame walls using continuousplastic coated soft copper or stainless steel - seegure 24. If copper is used, a protective metal covermust be placed in front of the pipework.

Timber framed construction of the inner wall requiresparticular consideration when it is proposed to rungas installation pipework within it. This should onlybe considered as a last resort, prefered options aredescribed on the previous page.

Where there is no other option, gas installationpipework may be laid within the timber frameconstruction provided the following is adhered to:

n Any gas pipe run should be kept to a minimumand run vertically within purpose designed

channels.n Channels should be tted with insulation and

covered with the vapour barrier and plasterboardto the same standard as the rest of the wall.

n Gas pipes should be adequately supported on thestuds.

n Pipe joints should be kept to an absoluteminimum.

n Compression ttings must not be used.n Studs should not be notched. Holes in studs

and holes and notches in horizontal timber /membranes should be kept as small as possible.

n

Pipes should be coated copper or steel to avoidcorrosion.n Where copper pipes are used, they should be

enclosed within a 18 swg steel sheet or equivalentmetal plate. (See gure 24). Alternatively,mild steel pipes may be used without furthermechanical protection. But full corrosionprotection is required.

n Provision should be made for the pipe toaccommodate any normal movement of thebuilding.

n Where the gas supply point is to be positioned ona separating (party) wall, the pipe should rise in

front of the nished plasterboard face.

Be Aware !

n Pipes must not be laid within separating(party) walls dividing individual dwellings.


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Figure 24:Full storey height riser in timber ramed walls

Section A-A

Figure 25:Appliance connection point to the ront o timberramed walls

Continuous PVCCoated Copper

Full storey height riser

No mechanicalttings permitted

Metal cover

100 mm

A A

100 mm

A A

Appliance connection-point riser

Applianceconnection point

PVC Coated

Copper

Additional nogginsrequired for support


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Internal pipework ducts

For Apartment Installation Guidelines:

Please consult Booklet 3

For installation of Gas within Duplexunits:

Please use external risers as per page 11 ofBooklet 3. If an external riser can not befacilitated, it is recommended that an internallled duct is used (as per page 16, Booklet 3).

Figure 26:Internal ventilated duct

Internalventilatedduct

PVC coated copperor steel pipework

Fire resistantmaterial

Gas pipes should not be tted in lift shafts or protectedshafts or in any space where gas could migrate inopenings to those shafts.

Building services shafts containing compressed air,steam or air conditioning ducts should not be used asa route for gas pipes.

For further details on the interaction of natural gaspipework and other services, please consult Booklet 3of this guide, page 20.

Vertical or horizontal purpose-laid ducts, containingpipework, should be ventilated at the top and bottomwith an open grille (see g 26). These vents to the ductmust have a free area of 5,000mm2 or 1/500th thecross sectional area of the duct, which ever is greater.

The purpose of the vents is to ensure that any escapeof gas can transmit to a non-hazardous area and bedetected by smell.


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Figure 27:Support o pipework to prevent corrosion caused bycontact with aggressive suraces

All pipework should be adequately supported toprevent the pipework from coming into contactwith surfaces that are likely to cause corrosion (e.g.concrete, masonry, plaster). Supports made fromplastic are generally acceptable.

Pipe Supports and xings

Be Aware !

Ferrous materials e.g. screws and support bracketsshall not be in contact with copper piping.

Table 8:Supporting pipework (Horizontally and vertically)

Pipe Support Distance

Material Normal size Interval for vertical run Interval for horizontal run(mm) (m) (m)

Copper Up to 15 2.0 1.222 2.5 1.828 2.5 1.835 3.0 2.542 3.0 2.554 3.0 2.7

Mild steel Up to 15 2.5 2.020 3.0 2.525 3.0 2.532 3.0 2.740 3.5 3.050 3.5 3.0


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25

Gas meters and electrical elements.

Pipework should not be installed closer than 150mm toan electricity meter. When this is not possible, a non-conductive shield should be placed between the pipeand the electrical equipment providing the requiredseparation distance.

Gas meters shall not be located above or below norcloser than 400mm to an electrical distribution board.

Pipework should be installed at least 25mm away fromthe electricity supply, distribution cables. Otherwisean appropriate electrical insulation material shouldbe wrapped around the pipe to prevent arcing. Gaspipework should always be separated by a minimum of10mm from other metal piped services.

Note:Subject to approval from electricity supplier.

Figure 28:Installation in relation to electrical meters etc.

Electricity meter

Electricity meter

150mm Min.

Non-conductive partition

150mmmin.


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26

Electrical cross bonding of supplypipework

For meters installed in external meter boxes, thebonding connection should be as near as practicableto the point of entry. Bonding wires should not beconnected in the meter box.

Figure 30:Internal Meter (Cross bonding)

In the case where the meters are installed inside thebuilding, the bond should be located within 500mm ofthe meter outlet pipe.

Figure 29:

External Meter (Cross bonding)

Pipeworkfrom meter

BondConnection toearth must beoutside meterbox

Temperatureresistant mastic

Grout

BondingConnection

500 mmMax


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27

Electrical Cross Bonding at boiler

The current edition of I.S.813: 2002 refers to somerequirements, which can be found in current editionsof the E.T.C.I. wiring regulations including the necessityto cross bond all extraneous metal work including gassupply, water and central heating pipes.

Figure 31:Cross bondingarrangement nearboiler

Example of Safety Notice

Some types of electrical installations are tted withequipotenial bonding, which is the connection ofthe internal gas and water pipes to the electricalinstallations earth terminal. In particular thoseinstallations with Protective Multiple Earthing(P.M.E) should, for safety reasons, be tted withequipotential bonding.

*For information contact your Electricity Supplier

In the Gas Safety Installation Standard I.S.813: 2002there is the safety information that any person whocarries out installation pipe work should inform theuser that electrical bonding must be checked (& ifnecessary rectied) by a competent person*, in anydwelling where electrical equipotential bonding maybe necessary.

Be Aware !

Risk of Electrical shock if Working onExisting Pipework

A temporary continuity bond must be used whencarrying out any work on the pipework or ttingswhich will break electrical continuity through them.

Electrical safety - equipotential (cross) Bonding

Be Aware !

Installers on sites should check with thebuilding contractor that the electrician iscompleting all bonding work and the existenceof an electrical completion certicate mustbe conrmed by the installer before issuinga Declaration of Conformance for the gas

installation (see pg 39). If the contractor onsite does not conrm this, then a copy of thenotice (shown below) should be afxed to theboiler before issue of a conformity declaration toI.S.813: 2002.

Gas Supply C.W. H.W.

Wall MountedGas Boiler


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28

Appliance Connections

It is necessary to provide an appliance valve within 1metre of each appliance supplied. Depending on theappliance the preferred valving methods are shownbelow.

Figure 32:Cooker fexible pipe connected to sel-closingbayonet valve.

Be Aware !

Plug type valves (gas cocks) are not permitted.

Figure 33:A valve may be tted in adjacent cupboards to the let orright o the oven / hob.

Cookers

Hobs and ovens

Yellow indicatessuitability forNat. Gas


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Figure 34:Valve near builders opening

Be Aware !

If not tting there as standard:

1. Do not connector leave live gaspipework to thebuilders opening.

or2. Turn off micro-point and cap offthe downstreamside of the valve.

Ball valve with casingush to wall surface

8mm wrappedcopper - 1mmax. run

10mm wrapped

copper - 3m max. run

Fires

Figure 35:Recessed valve - detail

When installed, turn on and ret coverdisk and plateRecessed valve located in chimney breast

Flush tting ball valve for concealed gas installations

All pipework to bePVC coated copper


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30

Positioning the boiler

A room sealed boiler, may be located within any roomof the dwelling. If located in bathroom / shower, inan enclosed compartment or understairs, additionalrequirements must be adhered to. (I.S.813: 2002).

Additional requirements are needed if placing a boiler

beneath stairs.

Central heating boilers and waterheaters

Figure 36:Boiler Valve

Lamps

Be Aware !

Open ue boilers are permitted in a smallnumber of locations.See I.S.813: 2002.

Figure 37:Location or valve or street lamp / garden lamp

These appliancesare normallytted with valvewhen supplied.

Wall Mounted

Gas Boiler

Gas valve on supply to boiler


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31

External pipework

External Appliances

Where appliances such as barbecues, patio heaters,and gas lights etc. are installed remote from thedwelling and the pipes are run underground,consideration should be given to installing anadditional isolation valve on the supply pipe atan accessible position either internally or externally as

Figures 39 / 40:Isolation valve and Barbecue point detail

25 mm min. depthburied in concrete

close as possible to where the pipe exits the dwelling.The valve should be labelled showing GAS OFFposition.

Please consult gure 38 below and page 12 for piperun requirements.

Figure 38:External pipework detail

Demountable connection (exible) with integral valve.

House wall Barbecue

Outsidegas valve

375 mm min.depth below grassand driveway

Plastic wrapped soft

copper tube

40 mm min. depthunder concrete slabs

150 mm sand/ne ll

Isolation Valve


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Permitted Flue terminal locations

Figure 41:Permitted locationsor fue terminations

Flue terminationguidelines

Irish standards alwaystake precedence overmanufacturers instructions,unless manufacturersinstructions call foradditional or more strictrequirements.

Sample powerFlue termination

Typical width 100 / 125 mm.

Boiler uetermination

Car ports shall have twoopen unobstructed sides

Guttering

All dimensions in mm


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Ventilation requirements forappliances

All appliances require combustion air.

Room-sealed appliances are provided with an airsupply from outside air through a sealed pipe to theappliance, with products of combustion expelled

through the ue. This, more often than not, is providedby a concentric ue arrangement.

Figure 42:Recommended venting detail

Be Aware !

Vents must not be adjustable or capable of beingclosed.

Be Aware !

The amount of free area from the airbrickand airspace grill should be sought frommanufacturer before tting.

Sizing of vents

When sizing vents the critical dimension is the amountof free area required. Physical dimensions of a ventare not of concern, but the amount of free area thatis available so that air may pass through it is critical.(Note table on page 34, specic requirements for oneof each type of appliance within a room).

The manufacturer should have a stamp on theirproducts showing total free area. When two or moreopen appliances are installed in the same compartmentor space, whether or not they are supplied as acombined unit, the aggregate input rating should beused for sizing the vents.

If an extraction fan, or cooker hood with an extractorfan, is tted in the room containing an open appliance,or in a connected space to this room, the size of thevent required should be increased by 500mm2 for each30 litre per second maximum extraction fan rate.

Airspace grillAirbrick


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34

Appliance type and input Minimum ventilation opening(free area) required

Decorative fuel effect res 10,000mm2

Open-Flued appliance < 7kW 3,500mm2

Open-Flued appliance > 7kW and < 14kW 6,500mm2

Open-Flued appliance > 14kW and < 70kW 450mm2 per kW

Fixed space heater Permanent openings of a minimum of(e.g. ueless re - see Case Study 9) 12,000mm2

The total ventilation required shall be equallydivided between high and low level openingson the same wall, separated by a minimum

distance of 1,600mm.

Maximum input rate 4.2 kW

(See note 2)

Note 1: Rooms built in accordance withthe 1997 Building Regulations TDGs havea minimum of 6,500mm2 ventilation, or inexcess of 12,000mm2 when a room containsa chimney. To allow this ventilation to count

towards the minimum opening required,it must be permanently xed in the openposition.

Alternative vents

Vents may be incorporated in window frames (Curtains

must not restrict air ow) and in doors in order tosatisfy the air requirement of gas appliances. The freeair requirement must be stated by the manufacturer.Openings must not be adjustable or capable of beingclosed.

Table 10:Appliance ventilation requirements

Note 2: As combustion products from thisappliance are released directly into the room,additional provisions may be needed to avoidcondensation and ensure satisfactory airquality. Advice should be sought from the

manufacturer of the specic appliance if notincluded in the manufacturers instructions.


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Safety for the Home OwnerSafety, certication & getting connected

Important notice to all installers

Under current legislation Bord Gis must be assured

that an installation is safe and complies with IrishStandard 813(I.S 813) Domestic Gas installationsbefore gas can be supplied to the dwelling.

It is a legal requirement under The Energy(miscellaneous provisions) Act 2006 that all domesticgas works must be under taken and certied by aregistered gas installer (RGI) who is registered with theRGII (Register Gas Installers of Ireland)

The Declaration of Conformance Certicate ,whichmust be signed by the RGI carrying out the work, is a

declaration by the RGI that the gas work is safe. That ithas been carried out in accordance with and conformsto the National standard for Domestic Gas InstallationsI.S.813.

Only a declaration of conformance certicate obtainedfrom the Register of Gas Installers of Ireland (RGII) andcompleted and signed by a RGI is acceptable for thispurpose.

Be Aware !

If the steps outlined are not followed, in theinterest of safety, the gas will not be suppliedby Bord Gis.

See below.

The Public Listing of Registered Gas Installers is available at:www.rgii.ie

Important NoticeA Registered gas Installer is only permitted to certify his / her own work or that of a registered Trainee

work under supervision.


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Domestic gas installation safety

Information for Registered Gas Installers (RGI) requiringa new meter t.

New Housing Projects

A Registered Gas Installer must

n Complete the entire gas installation

n Issue a declaration of conformance (postconstruction section)

n Leave properly completed gas supplier/networkoperator copy on site with part one (postconstruction section) completed

When the meter is tted the RGI must

n Connect to the gas installation

n Purge installation in accordance with I.S.813

n Commission appliances/installation in accordancewith manufacturers requirements

n Complete part 2 of the declaration ofconformance

n Issue customer copy of declaration ofconformance

n Return green copy to RGII within 10 days of issue

One off existing/new housing

The Bord Gis procedure for this type of installationallows for gas meters to be tted pre-construction. If aregistered gas installer requires a meter to be tted insuch circumstances then.

A Registered Gas Installer must

n Issue a declaration of conformance (preconstruction section)

n Leave properly completed gas supplier/networkoperator copy on site with part one (preconstruction section) completed

When the meter is tted the RGI must

n Complete the installation in accordance with I.S.813

n Connect to the gas meter installation (when readyfor commissioning)

n Purge installation in accordance with I.S.813

n Commission appliances/installation in accordancewith manufacturers requirements

n Complete post construction section (part 1) ofdeclaration of conformance

n Complete part 2 of the declaration ofconformance

n Issue customer with a copy of the declaration ofconformance

n Return green copy to RGII within 10 days ofmeter t

Be Aware !

Any person installing gas must be a RegisteredGas Installer to do so in accordance with I.S813 Domestic Gas Installations


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Commissioning of natural gasinstallations

Conducting a Soundness Test

Before a declaration of conformance is issued theR.G.I.I installer must carry out a soundness test toensure there are no leaks in the piped system.

The soundness test is carried out as follows:

n All work must be carried out by a Registered GasInstaller.

n Use only a pressure gauge / manometer withclearly marked 0.1 mbar gradations.

n Shut off all appliance valves.

n Pressurise installation with air to 100mbar (on

gauge).

n Wait for 5 minutes to ensure temperaturestabilisation.

n Check gauge / manometer and record exactmarking.

n After 5 minutes, check again.

n If pressure has dropped at all from noted mark,the installation can not be regarded as sound

and shall not be commissioned until the escape isrepaired and the installation re-tested.

n If pressure remains stable, then installation can bedeemed sound.

n Any component forming part of the installation,which was excluded from the pipework test,shall be reconnected, gas introduced into theinstallation and purging carried out. Theseconnections and components shall then be testedfor soundness using either a leak detection uidor a gas detector.

Be Aware !

Installers must be registeredsee I.S.813: 2002

Pressure test connection at meter outlet

Carrying out the soundness text.


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Commissioning of natural gasinstallations

Purging the installation

Every installation must be cleared (purged) of air or air/ gas mixture whenever a gas supply is made availablefor the rst time or when an existing system has beenshutdown and is being recommissioned.

Why is it necessary?

A gas / air mixture in the meter or pipework ispotentially explosive and it is necessary therefore toensure that the installation and appliances are left withonly a 100% natural gas concentration.

Whilst an appliance may initially light and burncorrectly, if there is a pocket of air in the internal

installation, the appliance ame will extinguish as theair reaches the appliance burner.

Be Aware !

It is a legal requirement under The Energy(miscellaneous provisions) Act 2006 that alldomestic gas works must be under taken andcertied by a registered gas installer (RGI) who isregistered with the RGII (Register Gas Installers of

Ireland.

Purging Method

n All work must be carried out by Registered GasInstallers

n Purging of a new installation should not beundertaken without completion of a satisfactorysoundness test.

n Purging from air to gas should be supervised by aRegistered Gas Installer

n Ensure the dwelling is well ventilated.

n Ensure there are no naked lights or sources ofignition.

n Select a purge point furthest away from the meterand in a well ventilated area.

n If it is necessary to purge from a point in aconned area then the purge should be piped toatmosphere.

n For most domestic installations one burner on thecooker hob is an ideal purge point.

n When a full ow of gas is veried, for example,by a stable burner ame, other appliances in the

dwelling should then be purged.

n Commission appliances.


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Declaration of Conformance

All elements of the declaration must be completed andsigned for and the copies distributed as instructed inthe document.

The completed top copy (white copy) should be givento, or left for, the householder. The Green copy sent to

the RGII. The Bord Gis meter tter collects and veriesthe second (yellow) copy. If you are not present, pleaseleave in meter box or attached to boiler.

Be Aware !

Only registered installers may issue aconformance declaration.

Sample declaration form

Bord Gis will not supply gas unless a valid, properlycompleted conformance declaration is submitted forverication in one of the ways described. See page 35/ 36.

The installer should retain the remaining copy in a

secure place, as it may be of use in the future shouldany difculties arise as to the safety or acceptability ofthe installation.

Figure 35: Certicate: Declaration oConormance

1CERT

S

Form G01(S) Version 1


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For gas mains and services

Bord Gis install all gas mains and services inaccordance with the latest edition of the followingIrish Standards:

I.S. 329 Code of Practice for Gas DistributionMains

&

I.S. 265 Installation of Gas Service Pipes.

RGII contact information

List of registered Gas Installers 01 4997998

Conformance Certicates 01 4997998

Web Site: www.rgii.ie

For your Next Residential Scheme

New Connections 1850 411 511

Construction 1850 411 511

Meter Boxes 1850 411 511

Dial before you dig 1850 42 77 47

For downstream of the meter

Irish Standard I.S.813: 2002 Domestic GasInstallations applies to installations downstream ofthe meter.

This Standard is the code of practice for Natural Gasinstallation requirements downstream of the point

of delivery and includes the requirements for meters,appliances and associated pipework in singleand multiple occupancy dwellings.

All of the above standards can be obtained fromthe NSAI (National Standards Authority of Ireland).Telephone (01) 8073878.

or

www.standards.ie

July 2010 Document no: 25697

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