Utility Installation Guide: Gas - Energetics...These are U6 size gas meter with a gas load ≤65kW...

Utility Installation Guide:Gas

www.energetics-uk.com

Practical Guidance and Contractual Requirements

3

GasUtility Installation Guide

© Energetics 2019. Utility Installation Guide: Gas v1.0

Copyright © 2019 an unpublished work by Energetics. All rights reserved.

Copyright Copyright © 2019 Energetics. All rights reserved. No part of this publication may be reproduced, transcribed, transmitted, stored in a retrieval system or translated into any language, in any form or by any means mechanical, manual, electronic, magnetic, chemical, optical, including photocopying or otherwise without the prior written permission of Energetics.

Confidentiality This document is the property of Energetics, and is provided on the understanding that its use will be confined to the officers of your company and that no part of its contents will be disclosed to third parties without the prior written consent of Energetics.

Version History

Document version Date Description / reason for modifications

Version 1.0 November 2019 First release of guide

Printing Control This document is uncontrolled when printed. The electronic version of this document is the approved and most current. Any printed version is uncontrolled and may not be current. Please ensure you are referring to the latest version.

Acknowledgements Energetics respectfully acknowledges all trademarks, trade names and other unique identification symbols, whether implied or explicit, used within this document.

Energetics Fenick House Lister Way Hamilton International Technology Park Glasgow G72 0FT

Tel: 03300 587 400 Web: www.energetics-uk.com


4

It contains the following sections:

• Gas Emergencies, gives instructions on what to do in the event of a gas emergency. The emergency number is given and general advice provided.

• Energetics Responsibilities, explains the role and responsibilities of Energetics during gas utility installations.

• Open Trench Gas Mains, explains what the Site Developer must do to prepare these, their depths, fine filling and marking them.

• Gas Mains Ducting, describes the Site Developer’s responsibilities for the depth at which ducts should be positioned, ducting sizes and ducting layouts.

• Gas Services Ducting, details the responsibilities of the Site Developer for the depths of gas services and the duct diameters.

• Flatted Properties – External Meter Boxes, gives details of how Site Developers must position and build external meter boxes.

• Flatted Properties – Meter Banks and Compartments, describes the Site Developer’s responsibilities and describes the ventilation requirements for meter rooms.

Gas

This document deals with the installation of gas services.

• Flatted Properties – External Steel and PE Risers, explains the Site Developer’s tasks for external gas risers in flatted properties.

• Flatted Properties – Internal Risers, describes how Site Developers must construct internal gas risers and the safety precautions that are needed.

• Flatted Property – External Pipeline Isolation Valve, explains how this type of isolation valve should be fitted in flatted properties.

• Gas Meters, describes the steps Site Developers must take when installing gas meters. This includes the dimensions of the meter cupboard, their labelling and steps to take to avoid damaging meters.

• Pressure Regulating Installations (PRIs) – Above Ground, describes how a PRI must be constructed above ground level, its dimensions and location.

• Pressure Regulating Installations (PRIs) – Below Ground, explains PRI construction under ground level, steps that should be taken and Site Developer’s responsibilities.

5



Your call will be taken by a call centre who will ask for more information. This will include:

• Your name and phone number.

• The address and location of the suspected gas escape or gas emergency.

• Where the smell is most noticeable.

• How long the smell has been noticeable.

• Whether any other properties are affected.

Gas Emergencies

If you smell gas or are concerned about gas safety on site, phone the 24 Hour National Gas Emergency Number on 0800 111 999 immediately.

Here is some general advice on what you should do if you suspect a gas escape or gas emergency (but always follow instructions from NGES):

• If the suspected gas emergency is indoors, open doors and windows to ventilate the property.

• Unless the smell of gas and the gas meter are located in a cellar or basement, turn off the gas supply at the meter. Do not enter the cellar or basement if the smell of gas is in there.

• Extinguish all naked flames. If possible remove any sources of ignition and do not smoke.

General Advice on Gas Emergencies

• Any special circumstances or access information.

• If the smell of gas is in or near to a highly populated building.

Your answers to these questions enable the National Gas Emergency Service (NGES) to send an engineer to the right address. The NGES can now provide you with the right safety advice in the shortest possible time.

• Do not turn off or turn on any power or light switches.

• Do not operate any electrical equipment.

• If the smell of gas is near or in an open excavation, do not enter the excavation.

• As far as reasonably possible, keep all personnel and members of the public clear from any area where there is a suspected gas escape.


6

These are detailed below:

• To lay all gas pipes in trenches pre-excavated or ducted (unless specified otherwise in the contract) by the Site Developer. This will only be done when it is confirmed that these trenches follow the correct route, are to the correct depth and the correct bedding has been provided.

• Install, test, connect, and commission gas services in ducts previously installed by the Site Developer.

Energetics Responsibilities

• Provide recessed meter boxes or universal meter boxes (Uni-box) for installation by the Site Developer. These are U6 size gas meter with a gas load ≤65kW only.

• Provide a marked up copy of a site drawing showing which gas mains and services are live on site during the construction phase.

NOTE: Energetics staff will not undertake any work beneath scaffolding.

Unless specified otherwise in their contract, the Site Developer is responsible for:

• Excavating and backfilling trenches to provide the required depth.

• Providing the required depth of cover to the top of the pipe and adequate fine bedding and main surround.

• Fully surrounding and covering the gas main with a minimum of 150mm of fine fill material above the crown of the main and 75mm below the main.

• Excavating of service jointing bays.

Energetics will lay gas mains in position in the pre-excavated trenches in accordance with the SWUK guidelines as shown in the following diagram:

Open Trench Gas Mains

NOTE: Gas mains laid in the roadway must be installed at a depth of 750mm of cover to the finished surface level.

© Energetics 2018 20

Part 2: Gas


Unless specified otherwise in their contracts, the Site Developer is responsible for:

• Excavating and backfilling trenches to provide the required depth.

• Providing the required depth of cover to the top of the pipe and adequate fine bedding and main surround.

• Fully surrounding and covering the gas main with a minimum of 150mm of fine fill material above the crown of the main.

• Excavating of service jointing bays.

Energetics will lay gas mains in position in the pre-excavated trenches in accordance with the NJUG guidelines as shown in the diagram below:

Note: Gas mains laid in the roadway must be installed at a depth of 750mm of cover to the finished surface level.

7



The Site Developer must:

• Ensure that where large diameter pipes and cables are laid, and/or where the footway or services corridor is less than 2m wide, then cross sectional spatial proposals must be agreed between Energetics and the Site Developer prior to construction starting.

• Maintain a minimum distance from to other plant of 250mm.

• Install the outside kerb log/brace and define the inner kerb line before Energetics start work on site.

As 3BE098

EG

G

E

E

G

270

3

272

276

The

31

268270A

266A

4

1

29

Sutton Mill

Artill

ery

Hous

e

Works

5

3

Arsenal

48

13

GUN

CO L

ANE

1

54

Cromet House

2

SNOW HILL

82

LANE

21

7

24

Wor

ks

13

27

3

43

6

8

11

BYRON'S

36

88

2

SLAC

K ST

MEE S

TREE

T

26

15

54

9450

52

55

63

65

64

E G

E

G

E

G

E

G

E

GAS

E

G

E

G

E

G

E G

E G

E G

E G

E

G

E

G

E

G

E

G

E

G

E

E

G

1 2 3

45

76

89

10

11 12

13 14

16

02

71 18 19

35

23

34

31

36

33

43

44

45

46

47

48

51

53

57

16

26

66

67

68

70

69

17

2773

7476

75

77

78

7908

81

2883

8485

86

E G

EG

E

G

E G

E G

E G

3BE098

3BE0

98

3RU0813R

U081

3PI078

3RU081

3BE098

4OA115

3RU0

813R

U081

3CH0

73

3RU081

3RU0813RU081

3RU0813RU081

3PI0

78

3CH0

73

3LA094

3BE098

4OA115

3RU081

3RU0

813R

U081

4OA115

As

As

AsOpp

Opp

As

As

As

As

As

As

Opp

As

AsOpp

AsOpp

As

Opp

Opp

As

As

AsO

pp

Opp

E

G

Opp4OA115

E

G

3WE1

03Op

p

E

G

Opp4OA

115

E

G

Opp4OA115

E

G

3LA094 Op

p

E

G

Opp4OA115

EG

3WE103

As

EG

3WE103

Opp

E

G

E

G

3WE1

03O

pp

Opp

E G

E G

AsO

ppE G

E G

3RU0

813R

U081

3BE0

98 A

LT3B

E098

ALT

As3BE098

E

G

E

G

3RU0813RU081

As

Opp

E

G

22

27

2425

2326

21

2829

30

E

G

E

3RU081Opp

3PI078

As

E

G

E

G

3LA094 Op

p

E

G

4OA115Opp

56

58

5960

87

E

G

3WE103

Opp

G

E

3WE103 As

As4OA1

15

38

39

41

42

E

G

E

G

EG

E

G

EG

EG

EG

EG

EG

EG

As4OA115

E

G

E

G

3RU0813RU081 As

G

E

G

E

4FU126

Opp

3FA116

As

G

E

G

E

4FU126As

3FA116Opp

G

E

4FU1

26

AsGE

E G

Opp3BE0

98

E G E

G

3RU081Opp

E

G

3WE103Opp

3WE103

As

As3BE0

98 A

LT

E

G

E

G

E

G

3WE103

As3LA094

Opp3LA094

As

AsO

pp

E

G

E

G

3RU081As 3RU081Opp

37

40

3FA1

16Op

p

As

G

E

3FA1

16

4FU1

26

Opp

3RU081

E

G

As

88

3RU081Opp

Sub Station

E

G

E

G

EG

EG

EG

EG

4BO140

4BO140

Opp

As4BO

140O

pp

4BO140

As

4BO1404BO140

OppAs

4BO140

4BO140

4BO140

As

4BO140

4BO140

AsO

pp

4BO140

4BO140

Opp

As4BO

1404BO

140

4BO140

Opp

AsO

pp

AsO

pp

E

G

Exist

ing

NG 1

80m

m P

E m

ain

Exist

ing

NG 1

80m

m P

E m

ain

CSEP LOCATION:125mm MDPE LP off existing180mm PE NG main.Branch saddle connection.

125mmMDPE LP

125mm MDPE LP

125m

m M

DPE

LP

125m

m M

DPE

LP12

5mm

MDP

E LP

90m

mM

DPE

LP

90mm MDPE LP

90m

m M

DPE

LP

90mm MDPE LP

63m

m M

DPE

LP

63mm MDPE LP

63mm MDPE LP

63m

m M

DPE

LP

63m

m M

DPE

LP

100m

m

100m

m

100mm2x

100mm

100mm

100mm

100m

m

100m

m

100m

m

100m

m

100mm

100mm

100mm

100mm

100mm100mm

100mm

100mm

100mm

100m

m

100m

m

100m

m

100m

m2x

Exist

ing N

G 18

0mm

PE m

ain

63mm MDPE LP

63m

m M

DPE

LP

100mm

7

6

5

4

3

2

E FDCBA

E FDCBA

8

7

6

5

4

3

2

1

8

1

Dimensions in mm

Carriageway

295

MAINS IN A 2M FOOTPATHRECOMMENDED ARRANGEMENT OF

Elec

lv A

lt po

s'n

Elec

hv

280 170

Elec

lv450

600

standard

Boun

dary

Lamp

295 270

GasC

able

TV

250

600

Wat

er

Tele

com

ms

430260

900

350

1255

2000

15501720

430

960690

Out

side

sto

p va

lve

International HouseStanley BoulevardHamilton International Technology ParkHigh Blantyre G72 0BNTel:01698 404949Fax:01698 404940Email: [email protected]

Network:

Revision: B

Checked by:

Date Checked:

Sheet Size:Scale:

Date Drawn:

Drawn by: R. Adamson

30.03.17

DrawingNumber:

Client:

OS GridReference:

DrawingTitle: GAS LAYOUT

Gas Material Specifications.Materials will be in accordance with industry standards and relateddocuments including: IGE/TD/3 - Distribution Mains. IGE/TD/4 - Gas ServicesPipe and associated fitting will be sourced only from approved supplierswhich comply with the QC procedures and aid material traceability.Polyethylene systems will be manufactured to meet national andinternational specifications, as listed below:Note- PE fittings to operate at 7bar shall be Class C, PE100. Forapplications at or below 2bar, fittings will be Class B, PE80

Polyethylene Pipe GIS/PL2-2 Pipes for use at pressures up to 5.5bar GIS/PL2-8 Pipes for use at pressure up to 7barPolyethylene Fittings GIS/PL2-3 Self anchoring mechanical fittings for polyethylene

pipe for natural gas GIS/PL2-4 Fusion fitting with integral heating elements GIS/PL2-6 Spigot end fittings for elector fusion and / or butt

fusion purposesMains Valves GIS/V7-1 Distribution valves - Metal bodied line valves for use

at pressures up to 16bar and construction valves for use at pressures up to 7bar

GIS/V7-2 Distribution valves - plastic bodied line valves of sizes up to and including 180mm MDPE suitable for operation at pressures not exceeding 5.5bar

Service Valves GIS/V4 Service isolation valves up to 50mm diameter for use

up to 7bar maximum working pressureExcess Flow Valves GIS/EFV1 Specification for flow limiters for Polyethylene services

operating at a pressure above 75mbar and not exceeding 2bar and for gas flow not exceeding 6m3/hr

Emergency Control Valves (Meter Control Valves) GIS/V7-3 Brass Valves and associated fittings for pressures not

exceeding 5barDomestic Gas Meters & Associated Fitting BS 746 Specification for gas meter unions and adaptors BS EN 1359:1999 Gas meters diaphragm meters BS EN 10380 Pipework - corrugated metal hoses and hoseassemblies

N

Location of existing National Grid Gas Mains as shown is indicative only. Pleaserefer to NG Maps for guidance on exact location of mains or contact National GridPlant Protection Team (Tel: 01604 815 361 / 0800 688588) or e-mail at'[email protected]' prior to the commencement of any excavationworks. Hand dig only in the immediate vicinity of the National Grid Gas Mainusing safe digging practices, in accordance with HS (G) 47 Guidelines.

All single domestic services to be 32mm MDPE.

All unibox gas meter boxes to be located in an accessible area. The installation areamust be such that the meter boxes do not cause a trip hazard, are not susceptible todamage or covered by vegetation.

Where meter boxes are installed in groups such as for flatted properties then eachmeter box must be clearly and permanently marked with the address which it serves.

Dumb meters to be installed by Energetics.

125 & 180mm 225mm

315mm250mm

450mm350mm

GAS PIPE EXT. DIAMETER

32mm & less

90mm63mm

100mm

150mm100mm

DUCT MIN. INT. DIAMETER

All ducting used on site to facilitate gas mainroad crossings and gas services must conform toBritish Standard BS 4962, be of yellow perforatedconstruction, be surrounded by 75mm ofsand/fine-fill, and have “Gas” marker tape laid100mm directly above it. Polyethylene (PE) gas,water or cable pipe must not be used as a duct.A draw cord should always be inserted.

PROPOSED LP MAINS

PROPOSED MP MAINS

CAP END

DIAMETER CHANGE

PROPOSED IP MAINS

VALVE

GAS METERBOX / KIOSK

PRESSURE REDUCTIONINSTALLATION (P.R.I)

GAS RISER

GAS METER

GAS KEY

90mm 63mm

M

EXISTING/AS LAID LP MAINS

EXISTING/AS LAID MP MAINS

EXISTING/AS LAID IP MAINS

PIPE TO BE DECOMMISSIONED

PROPOSED LP SERVICE

PROPOSED MP SERVICE

DECOMMISSIONED PIPE X X X X

EXISTING/AS LAID LP SERVICE

EXISTING/AS LAID MP SERVICE

CPCATHODIC PROTECTION

MEDIUM PRESSURE SERVICEEXCESS FLOW VALVE

PPRESSURE PROTECTIONPRIDER PURGE POINT

PLOTS WITH CONNECTIONSOFF OTHER GT/ EXISTING GASNETWORKS

EXISTING HP MAINS

Rev Revision Details By Date

A Preliminary design 07.03.17GM/RA

B

C

D

E

F

G

H

G. McCaig

1:500 A1

30.03.17

10355_300_Gunco Lane, Macclesfield_1 of 1

10355_Gunco Lane, Macclesfield

392181 / 372602

Bellway Homes (Manchester)

Main added at side ofplot 10

30.03.17GM/RA

DESIGN

Date - 00.00.00

APPROVED BY

• Ensure ground levels are within + 150mm or – 150mm of the finished levels before Energetics start work.

• Place gas warning marker tapes 150mm to 250 mm directly above the main at the time of backfilling.

• Complete backfilling of the trench before any pressure testing or commissioning of the gas mains takes place.

The diagram below shows an example of a design approved gas drawing:

DESIGN

Date - 00.00.00

APPROVED BY DESIGN NOTAPPROVED

DESIGN

Date - 00.00.00

APPROVED BY DESIGN NOTAPPROVED



8

• That the gas main ducts are laid at the appropriate depths.

The following diagram shows a typical main’s crossing layout. It gives the depths at which the different utility ducts must be laid.

The Site Developer must ensure that for all road crossings:

• That an approved type of utility ducting is provided for gas mains (BS 4962).

• That ducting for gas mains road crossings is of the correct colour, material and laid at the correct depth and location.

Gas Mains Ducting

All ducts must have fine fill material 75mm above and below.

It is the Site Developer’s responsibility to ensure that the depths shown above are maintained.

The Site Developer must also position Gas Marker Warning Tape between 150mm to a maximum of 250mm directly above the gas main ducts.

900m

m

750m

m

700m

m

600m

m

Water

250mm 250mm 250mm

GasElecHV

ElecLV

Blue Duct

YellowDuct

Duct Marked ‘Electricity’

Typical Mains Crossings LayoutAll ducts to have �ne �ll material

75mm above and below

Ground Level

9



The following table provides details of the internal diameters required for the ducting for each size of gas pipe:

Minimum Mains Ducting Sizes

As 3BE098

EG

G

E

E

G

270

3

272

276

The

31

268270A

266A

4

1

29

Sutton Mill

Artil

lery

Hou

se

Works

5

3

Arsenal

48

13

GU

NC

O L

ANE

1

54

Cromet House

2

SNOW HILL

82

LANE

21

7

24

Wor

ks

13

27

3

43

6

8

11

BYRON'S

36

88

2

SLAC

K ST

MEE S

TREE

T

26

51

45

4950

52

55

63

65

64

E G

E

G

E

G

E

G

E

GAS

E

G

E

G

E

G

E G

E G

E G

E G

E

G

E

G

E

G

E

G

E

G

E

E

G

1 2 3

45

76

89

10

11 12

31 14

16

20

17 81

19

35

32

34

13

36

33

34

44

54

64

47

48

51

53

75

61

62

66

67

86

70

69

71

7273

7476

75

77

78

7980

81

8283

8458

86

E G

EG

E

G

E G

E G

E G

3BE098

3BE0

98

3RU0813R

U081

3PI078

3RU081

3BE098

4OA115

3RU

0813

RU08

1

3CH

073

3RU081

3RU0813RU081

3RU0813RU081

3PI0

78

3CH

073

3LA094

3BE098

4OA115

3RU081

3RU

081

3RU

081

4OA115

As

As

AsOpp

Opp

As

As

As

As

As

As

Opp

As

AsOpp

AsOpp

AsOpp

Opp

As

As

AsO

pp

Opp

E

G

Opp4OA115

E

G

3WE1

03O

pp

E

G

Opp4OA

115

E

G

Opp4OA115

E

G

3LA094 Op

p

E

G

Opp4OA115

EG

3WE103

As

EG

3WE103

Opp

E

G

E

G

3WE1

03O

pp

Opp

E G

E G

AsO

ppE G

E G

3RU

0813

RU08

13B

E098

ALT

3BE0

98 A

LT

As3BE098

E

G

E

G

3RU0813RU081

As

Opp

E

G

22

72

2425

2362

12

2829

30

E

G

E

3RU081O

pp

3PI078

As

E

G

E

G

3LA094 Op

p

E

G

4OA115Opp

56

58

5960

87

E

G

3WE103

Opp

G

E

3WE103 As

As4OA

115

83

93

41

42

E

G

E

G

EG

E

G

EG

E

G

EG

E

G

EG

E

G

As4OA115

E

G

E

G

3RU0813RU081 As

G

E

G

E

4FU126

Opp

3FA116

As

G

E

G

E

4FU126As

3FA116Opp

G

E

4FU1

26

AsGE

E G

Opp3BE0

98

E G E

G

3RU081Opp

E

G

3WE103Opp

3WE103

As

As3BE

098

ALT

E

G

E

G

E

G

3WE103

As3LA094

Opp

3LA094As

AsO

pp

E

G

E

G

3RU081As 3RU081Opp

37

40

3FA1

16O

pp

As

G

E

3FA1

16

4FU1

26

Opp

3RU081

E

G

As

88

3RU081O

pp

Sub Station

E

G

E

G

EG

EG

EG

E

G

4BO140

4BO140

Opp

As4BO

140O

pp

4BO140

As

4BO140

4BO140

Opp

As

4BO140

4BO140

4BO140

As

4BO140

4BO140

AsO

pp

4BO140

4BO140

Opp

As4BO

1404BO

140

4BO140

Opp

AsO

pp

AsO

pp

E

G

3x150mm

100m

m

100m

m

100m

m

100mm

100mm

100mm

100mm

100mm

100mm

100m

m

100m

m

100m

m

100m

m

100mm

100mm

100mm

100mm

100mm

100mm

100m

m

100m

m

100mm

100mm

100mm

100mm

100m

m

100m

m

100mm

100mm

100mm

100mm

100mm

100mm

100mm

100m

m

100mm

100mm

100mm

100mm

100mm

100mm

100m

m

100m

m

100m

m

100mm

100mm

100mm

100mm

100mm

100mm

100mm

100mm 1

00m

m10

0mm

100m

m

100m

m

100m

m

100m

m

100m

m

2x150mm

100mm

100mm

100m

m10

0mm

100m

m10

0mm

100mm100mm

100mm

100m

m

100m

m

100m

m

100m

m

100m

m

100m

m

100m

m

100m

m

100m

m

100mm

7

6

5

4

3

2

E FDCBA

E FDCBA

8

7

6

5

4

3

2

1

8

1

GAS DUCT

WATER DUCT

MU / DUCT KEYELECTRIC LV DUCT

ELECTRIC HV DUCT

MU ROUTE

TELECOMMS DUCT

CABLE DUCT

900m

m

750m

m

700m

m

600m

m

WATER

250mm 250mm 250mm

GASELEC

HV

ELECLV

BLUEDUCT

YELLOWDUCT

DUCT MARKED 'ELECTRICITY'

600m

m

600m

m

GAS ELEC

250mm750

mm

250mm

WATER100mmBLUEDUCT

100mmYELLOW

DUCT

100mm DUCTMARKED 'ELECTRICITY'

Ground Level

Ground Level

125 & 180mm 225mm

315mm250mm

450mm350mm

GAS PIPE EXT. DIAMETER

32mm & less

90mm63mm

100mm

150mm100mm

DUCT MIN. INT. DIAMETER

International HouseStanley BoulevardHamilton International Technology ParkHigh Blantyre G72 0BNTel:01698 404949Fax:01698 404940Email: [email protected]

Network:

Revision: B

Approved by:

Date Approved:

Sheet Size:Scale:

Date Drawn:

Drawn by: R. Adamson

30.03.17

DrawingNumber:

Client:

OS GridReference:

DrawingTitle: MU ROUTE AND DUCT LAYOUT

N

Gas Notes

1. Only one service is permitted with in a gasservice duct.

2. All Gas ducts to be perforated.

Gas & water ducts to comply with BS4692:1989Electric ducts to comply with ESISPECIFICATION 12-24

Recommended supplier for ducts-

Scotland NorthWestFusion Provida Fusion ProvidaDeans Ind Est Unit 9Livingstone Fishwicks Ind EstEH54 8AH Kilbuck Lane

St Helens Merseyside WA11 9SZ

G. McCaig

1:500 A1

30.03.17

10355_600_Gunco Lane, Macclesfield_1 of 1

10355_Gunco Lane, Macclesfield

392181 / 372602

Bellway Homes (Manchester)

Rev Revision Details By Date

A Preliminary design 09.03.17GM/RA

B

C

D

E

F

G

H

Plot 10 - Gas: Mains routerevised and duct added 30.03.17GM/RA





Ducting layouts may be shown on a specific gas layout drawing. In the case of multi-utility projects, a combined layout drawing may be provided by the Site Developer. An example of a multi-utility duct layout drawing is shown below:

Ducting Layouts

External diameter Internal diameter of gas main of ducting

63mm 100mm

90mm 150mm

125mm 200mm

180mm and 250mm 225mm and 300mm

315mm 400mm

Gas Mains Ducting

90mm 63mm

M

X X X X

CP

P

P

Pressure ReductionInstallation (P.R.I)

Gas Key

Medium Pressure ServiceExcess Flow Valve

Pressure Protection

Rider Purge Point

Plots With ConnectionsOff Other GT/ Existing Gas Networks

Proposed MP Mains

Proposed LP Mains

Cap End

Diameter Change

Proposed LP Mains

Valve

Gas Meterbox / Kiosk

Gas Riser

Gas Meter

Existing/as Laid LP Mains

Existing/as Laid MP Mains

Existing/as Laid LP Mains

Pipe to be Decommissioned

Proposed LP Service

Proposed MP Service

Decommissioned Pipe

Existing/as Laid MP Service

Existing/as Laid LP Service

Cathodic Protection

Existing HP Mains


10

It is the Site Developer’s responsibility to ensure:

• That an approved type of utility ducting is provided for gas services (BS 4962). The duct must be yellow and perforated along its entire length.

• That the line and depth of the gas service ducts are installed perpendicular to the property and to the main as per the approved design drawing and the latest version of IGEM/TD/4. The gas service ducts must be 250mm away from other utility services.

The following points are also important:

• In private ground the duct shall be laid to a finished depth of cover of 450mm. This applies over the length of the service, increasing to a minimum of 500mm of cover for the final 2m length at the meter box end. It is the Site Developer’s responsibility to ensure that these are maintained.

• Gas Marker Warning Tape must be positioned by the Site Developer 100mm directly above all gas service ducting.

Gas Services Ducting

Note: Only one service is permitted within a gas service duct.

7072

7366

7168

6774

69

103

104

105

106

107

108

109

110

111

G E

G E

EG

EG

E G

E G

G E

GE

GE

GE

GE

G E

G E

G E

GE

GE

100mm

100mm

100mm

100mm

100mm

100mm

100mm

100mm

125m

m M

DPE

The drawing below shows a typical duct drawing for gas services:

11



All ducts to have fine filling material 75mm above and below them.

Where the external diameter of the service pipe is 32mm, the internal diameter of the duct carrying must be 100mm.

Minimum Services Ducting Diameter

Different utilities are required to be laid at different depths as set out below. It is the Site Developer’s responsibility to ensure these are maintained. The following diagram summarises these depths:

Depth of Services

When installing external meter boxes to flat properties, the Site Developer must:

• Install gas meter boxes no closer than 150mm from cavity wall air bricks.

• Fit lids to the meter boxes when they are installed.

• Clearly identify flatted properties at the meter box before they are installed.

Flatted Properties - External Meter Boxes

Examples of ground level external meter boxes are shown below:

Gas Services Ducting

900m

m

750m

m

700m

m

600m

m

Water

250mm 250mm 250mm

GasElecHV

ElecLV

Blue Duct

YellowDuct

Duct Marked ‘Electricity’



Ground Level


12

Note: Energetics will not fit meters until the internal pipework is completed, the construction of the meter compartment finished, the required ventilation

provided and an appropriate lockable door has been installed.

Flatted Properties - Meter Banks and Compartments

Flatted properties often have meter banks located in meter rooms. An example of this is shown below:

For flatted properties, it is the Site Developer’s responsibility to:

• Ensure that the residents have 24/7 access to the meter room. This includes the provision of keys and access codes where applicable.

• Ensure that all pipework from the meter to the individual property is installed and labelled to identify the flat number prior to meters being fitted and commissioned.

• Provide a statement confirming the integrity of the building should there be a fire or explosion at or within the meter room.

• Provide adequate ventilation for the meter rooms.

13



No of external walls

Minimum area of free ventilation required as a % of the compartment floor area

Type of natural ventilation required to the outside

Position of low level vents

Position of high level vents

1 3%Louvered door or high and low level indicators

150mm above the floor

2 2%High and low level ventilators






As close as possible below, but no more than 10% of the total compartment height below, the roof or ceiling level

It is the Site Developer’s responsibility to ensure that ventilation is provided for the meter rooms. They must:

• Completely seal the meter room from any other part of the building.

• Provide meter rooms with a minimum ventilation of 2% of the nominal floor area when the ventilation is on two or more walls. If the ventilation is only on one wall, this increases to 3% of the nominal floor area.

Ventilation of Meter Room

• The ventilation shall be natural to the outside air and be evenly distributed at high and low levels.

See the table below for meter compartment ventilation requirements:

Flatted Properties - External Steel and PE Risers


14


The photographs below show examples of an external PE Riser System for flatted properties:

The cross-section diagram below shows an example of an external steel or PR riser installation to a conventional build:

LATERAL ISOLATION VALVEOPTIONAL ISOLATION VALVE

OR BUILDING ENTRY TEE WITHINTEGRAL VALVE

VIEW A

FLAT

FLAT

FLAT

ECV

ECV

ECV

VIEW A

INSOLATION JOINT

GROUND LEVEL

ACCESS CHAMBER PIV

15



It is the Site Developer’s responsibility to:

• Provide a suitable safe access platform for the installation of all external gas riser works.

• Provide suitable sleeved core drillings for the installation of the lateral entries to the individual properties. The diagrams below show fire stopping and sleeving lateral gas pipes passing between walls or fire compartments.

• Risers supplying timber frame flatted properties must terminate immediately on the inside of the timber frame wall. They should not extend vertically or horizontally in the building. Site Developers must ensure meter location caters for this requirement.

• Ensure that pipes supplying timber frame flatted properties do not pierce through any other fitment or fitting within the timber frame structure. This includes items such as meter boards, kitchen units, fitted cupboards, etc.

Single Skin Walls

10mm

10mm10mm

Conventional Cavity Walls

10mm

10mm10mm

• Ensure that site staff do not fix risers, laterals and gas pipes supplying timber frame flatted properties to the timber frame under any circumstances.

• Prevent other utilities being attached to any part of the gas network.

The diagram below shows the fire stopping and sleeving lateral gas pipes passing between walls in a timber framed property. Note the need to make adequate allowance for internal movement due to shrinkage of the timber frame wall:


View AView A

Anticipated PositionAfter Movement

Original Position ofPipe Entry

Make Adequate Allowance For InternalMovement Due To Shrinkage Of The Timber

Frame Wall Cover Plate To Be Provided

Part 2: Gas


The photo below shows a gator installed on the inside of the lateral entry:

The photo below shows a gator installed on the inside of the lateral entry:

The diagram below shows the fire stopping and sleeving lateral gas pipes passing between walls in a timber framed property. Note the need to make adequate allowance for internal movement due to shrinkage of the timber frame wall:


16

Cross Sectional Area of Duct (m2) Equivalent Duct Dimensions

Minimum Free Area of Each Opening (m2) Equivalent Opening Diameter

≤0.01 ≤100mm x 100mm 0.002 50mm

>0.01 >100mm x 100mm≤0.375 ≤600mm x 600mm

0.0075 100mm

>0.375 >600mm x 600mm≤7.5 ≤2.7m x 2.7m

0.05 250mm

>7.5 >2.7m x 2.7m 1/150th of Cross Sectional Area of the Duct Dependent on the Cross Sectional Area of the Duct

For flatted properties, for internal gas risers, the Site Developer must:

• Provide half-hour fire resistant ducts/shafts. These must be constructed to BS 8313 standards.

• Ensure ducts have sufficient dimensions to accommodate initial construction and provide suitable access for ongoing maintenance.

• Ensure that all ducts are fitted with removable/replaceable access panels, which gives maintenance access to the riser.

Flatted Properties - Internal Risers

Services in ducts are specified in BS 8313:1997

The table below shows the minimum duct ventilation requirements for a full height internal gas riser:

Note: Energetics will make inspections of the ducting prior to installing any gas riser and on completion of the duct installation. This is to ensure

that the ducting and ventilation meets the standards required.

Duct Detail Ventilation Opening Details

The Site Developer must comply with:

• IGEM/G/5.

• Last Mile Asset Management policy for Multi-Occupancy buildings.

General Statement

• With the requirements of Last Mile Gas Ltd Gas In Flats procedures GIF1,2,3.

• Use a suitable material for the access panels such as ‘Superlux’. A suitable material helps the access panels to be removed and replaced without affecting the quality of the ventilation.

• Ensure that the riser ducts are permanently ventilated directly to the atmosphere. This must be done either:

- at the top and bottom

-or-

- at the top and bottom of each floor where fire stopped.

17



The following diagram shows an example of an external wall vent:

If the duct is not continuous, it must be ventilated at the top and bottom of each section. Between floors, the ends must be sealed so that the fire resistance of the property is not impaired.

External Wall Vent

The following diagrams show fire stopping and sleeving gas risers passing between floors or fire compartments:

Gas Risers Passing Between Floors or Fire Compartments

Fixing Screws

Ventilator

Spacer

Position of ductin external wallventilating directto outside air

NOTE:The overall dimensions of the ventilation are typically much larger thanthe ventilation duct and therefore will require spacers to be fitted toensure the full area of ventilation is used as demonstrated by thefollowing diagram.

Section of duct cut �ushwith wall

Fixing Screws

Ventilator

Spacer

Position of ductin external wallventilating directto outside air

NOTE:The overall dimensions of the ventilation are typically much larger thanthe ventilation duct and therefore will require spacers to be fitted toensure the full area of ventilation is used as demonstrated by thefollowing diagram.

Section of duct cut �ushwith wall

Flatted Properties - Internal Risers


18

Flatted Property - Internal Pipeline Isolation Valve

The Site Developer must ensure that Isolation Valves located within the building have unrestricted access for Emergency Services to isolate the gas supply.

The next diagram shows fire stopping and sleeving lateral gas pipes as they pass between walls or fire compartments.

Both Single Skin Walls and Cavity Walls are demonstrated:

Single Skin Walls

10mm

10mm10mm

Conventional Cavity Walls

10mm

10mm10mm

Single Skin Walls Cavity Wall

A gas service pipe that supplies an internal or external gas riser must have an external Pipeline Isolation Valve (PIV) fitted. The following points are important:

• These should be fitted 5-10 metres from the building.

• The Site Developer must ensure PIV are located in the footway, not within an area that may be planted with shrubbery or where vehicles are likely to park.

Part 2: Gas


Flatted Property – External Pipeline Isolation Valve

A gas service pipe that supplies an internal or external gas riser must have an external Pipeline Isolation Valve (PIV) fitted. The following points are important:

• These are normally fitted 5-10 metres from the building.

• The Site Developer must ensure these are located in the footway, not within an area that may be planted with shrubbery or where vehicles are likely to park.

• The Site Developer must ensure a gas surface box is installed to permit future access to the valve. This box must be installed as part of the permanent reinstatement. Clear access to the top of the valve must be maintained and be clear of all debris.

The diagrams below show the requirements for the gas surface box fitted during the permanent reinstatement.

600m

m C

ove

r Fo

otp

ath/

45

0mm

Co

ver

Pri

vate

Gas Valve Box Cover marked with ‘G’ or GAS to be fitted as part of permanent reinstatement

Access box/pit to be supplied by Developer prior to permanent reinstatement

• The Site Developer must ensure a gas surface box is installed to permit future access to the valve. This box must be installed as part of the permanent reinstatement. Clear access to the top of the valve must be maintained and be clear of all debris.

The diagram below show the requirements for the gas surface box fitted during the permanent reinstatement.

External Pipeline Isolation Valve

19



Gas Meters

Where a gas meter is to be installed within an internal cupboard, the Site Developer must ensure:

• That a minimum installation area of 500mm (H) x 500mm (W) x 300mm (D) is maintained.

• That the gas meter is not located below or within 40mm of the electrical distribution board.

• That the gas meters and associated fittings are installed with a minimum separation distance of 150mm from any electrical meters and 25mm from any electrical cable.

Meter Point Reference Number

Information required for flatted properties where meter is installed in a meter bank

Service Information Label

The Site Developer must ensure that meters or their labels are not removed, damaged or exchanged to another property once they have been installed.

Each meter supply point has a Service Information Label attached at the Emergency Control Valve. The label contains a Meter Point Reference Number (MPRN) which is a unique number allocated to each plot. Energetics supply and install these labels.

If the meter is located in a communal meter bank, the Site Developer must ensure that the flat number which the meter supplies is clearly identified and marked at the meter position for the plot. This is recorded on the Service Information Label when the label is installed.

Shown here is an example of a Service Information Label:

Energetics will not fit meters until the associated installation pipe work has been completed and it is clearly and permanently labelled by the developer to identify the property that it supplies.

• Where internal cupboards containing gas meters, open onto a means of escape from the property, the cupboards must have a minimum ½ hour fire rating with a self-closing door.


20

Damage to Meter Installations

Part 2: Gas



The flexible connection pipe connecting the outlet of the Emergency Control Valve to the meter installation is made out of corrugated stainless steel.

Some solder fluxes, used on copper joints, are particularly corrosive to stainless steel. They can quickly cause corrosion in the form of pin holes.

The Site Developer must ensure that any flux spillage on the flexible stainless steel meter connectors and other parts of the meter installation is immediately cleaned and rinsed off to avoid potential corrosion and the risk of leaking gas.

The image below shows damage to a flexible connection pipe:

The following points are also important to prevent damage to the meter connections:

• Commercially available washing up liquids also contain substances that are potentially corrosive. Washing up liquid or similar soap solutions should not be used as a Leak Detection Fluid (LDF).

• The Site Developer must ensure that any LDF is completely wiped off after the tightness testing of the installation pipework has been completed.

• The Site Developer must also ensure that when their Gas Engineer tests and commissions the gas installation pipework, they do not over-tighten the meter test nipple as this will permanently damage the gas meter. The image below shows damage to a meter test nipple.

Part 2: Gas






The image below shows damage to a flexible connection pipe:


• Commercially available washing up liquids also contain substances that are potentially corrosive. Washing up liquid or similar soap solutions should not be used as a Leak Detection Fluid (LDF).



If you smell gas or are concerned about gas safety on site, phone the 24 hours National Gas Emergency Number on 0800 111 999.

The Site Developer must ensure that any flux spillage on the flexible stainless steel meter connectors and other parts of the meter installation is immediately cleaned

and rinsed off to avoid potential corrosion and the risk of leaking gas.




The following image shows damage to a flexible connection pipe:


• Commercially available washing up liquids also contain substances that are potentially corrosive. Washing up liquid or similar soap solutions must not be used as a Leak Detection Fluid (LDF).



Any costs associated with remedial works are passed directly on to the Site Developer.

Gas Meters

21



Inlet Outlet

Front

Parking Bay

Pressure Regulating Installations (PRIs) - Above Ground

The position of the PRI must be agreed with Energetics at the design stage and not subsequently altered without Energetics written agreement.

The Site Developer must ensure:

• That the PRI is sited at least 3 metres from any building or ignition source.

• That the PRI is located in a place where maintenance teams are able to access and egress from, and work in vicinity of, the PRI. This is particularly important in the event of emergency works.

Location

Note: The sizes are determined by the dimensions of the PRI.

• That a parking space is provided for the maintenance team vehicle where identified on the approved design drawing.

The diagram below shows an example layout for a PRI:


22

Front

Plan

Elevation

Side Elevation

Isometric View

Front

Plan

Elevation

Side Elevation

Isometric View

Front

Plan

Elevation

Side Elevation

Isometric View


• The concrete base for the PRI is adequately sized:

- The concrete base dimensions will be 300mm greater than the external dimensions of the kiosk, though this may be less for smaller sites with Energetics agreement.

- The base thickness will be a minimum of 200mm, with consideration for the installation of reinforcement. Energetics may specify a smaller base for smaller sites.

- That the base has a 45-degree chamfer around the perimeter of the base.

- That the base is installed on a compacted sub-base layer of MOT Type 1, to a minimum 200mm depth.

• That the minimum specification of concrete used is c30.

Construction

The sizes are determined by the dimensions of the PRI.

Prior to commissioning the PRI, Energetics and the Network Operator will conduct an inspection. The purpose of this is to ensure that all work required for the construction and operation of the

PRI is completed. Any outstanding work will result in the PRI not being commissioned.

• When the base has been constructed, it must be protected from the weather. It must be given a 3-day period before installation of the module / housing so that the concrete sets properly.

• That the base has a floated finish.

• When commissioning is finished, the slots must be backfilled with sand and a 50mm layer of C30 concrete to finish the base.

• All shuttering must be removed on completion of works.

• All legal completions must be in place before the PRI is commissioned.

The diagram below shows a typical drawing for a PRI base


23



The images below show typical arrangements for PRIs on completion:



24

Pressure Regulating Installations (PRIs) - Below Ground

Location

a vent stack is required forbelow ground installation

surface level

porousmaterial

customer to install adrainage to surface

water drainage system

Twin Stream Installation

Inlet and outlet valves to be installeda minimum of 2m from PRI

InletValve

OutletValve

The position of the PRI must be agreed with Energetics at the design stage and not subsequently altered without Energetics written agreement.


• That the PRI is sited at least 3 metres from any building or ignition source.

• That the PRI is located in a place where maintenance teams are access and egress from, and work in the vicinity of, the PRI. This is particularly important in the event of emergency works.

• That the installation is located away from any carriageway or parking area. For example, the installation could be located in a verge or footpath.


• That the PRI is not installed in areas where there is a risk of flooding.

• That the site (and equipment) is located to avoid damage from vandalism or road traffic.

• That the PRI is clear of overhead electricity cables and large trees.

• That there is a suitable location for terminating relief pipework in a 3m high vent stack.

• That a parking space is provided for the maintenance team vehicle where identified on the approved design drawing.

The diagrams below show an example layout for a PRI below ground:

25




• That the concrete base for a PRI is sized adequately for the PRI module in accordance with Energetics’ specifications.

• That the minimum specification of concrete used is C30.

• That on completion of construction of the base, it must be protected from the weather. It must be given a 3-day period before installation of the module / housing so that the concrete sets properly.

• That the base has a floated finish.

Construction

Prior to commissioning the PRI, Energetics and the Network Operator will conduct an inspection. The purpose of this is to ensure that all work required for the construction and operation of the

PRI is completed. Any outstanding work will result in the PRI not being commissioned.


• When commissioning is finished, the slots must be backfilled with sand and a 50mm layer of C30 concrete to finish the base.

• All shuttering must be removed on completion of works.

• All legal completions must be in place before the PRI is commissioned.

The diagram below shows an example drawing for a PRI base:

A393 Mesh

Concrete Base

Compacted Type 1Granular Material

Plinth Elevation

Plinth PlanA393 Mesh

Concrete Base

Compacted Type 1Granular Material

Plinth Elevation

Plinth Plan



26

The image below shows a typical arrangement for a below ground PRI on completion:


Energetics Fenick House Lister Way Hamilton International Technology Park Glasgow G72 0FT

TEL: 03300 587 400 www.energetics-uk.com

Date post:	31-Jan-2021
Category:	Documents
Upload:	others
View:	1 times
Download:	0 times

Utility Installation Guide: Gas - Energetics...These are U6 size gas meter with a gas load ≤65kW...

Documents