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BS 6400-1:2006

BS 6400-1:2006

$189.07

Specification for installation, exchange, relocation and removal of gas meters with a maximum capacity not exceeding 6 m3/h – Low pressure (2nd family gases)

Published By Publication Date Number of Pages
BSI 2006 46
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PDF Pages PDF Title
3 Contents
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Planning and exchange of information 6
5 Competency 7
6 Design 8
7 Gas transporter appraisal of primary meter installations 19
8 Fitting a meter installation 20
9 Gas tightness testing and purging 25
10 Commissioning of the meter installation 25
11 Notices 27
12 Meter exchange and/or replacement of other gas fitting 29
13 Meter relocation 30
14 Meter removal 34
15 Records 35
16 Post installation checks 35
Annexes
Annex A (normative) Sizing of meters 36
Bibliography 37
List of figures
Figure 1 – Arrangement of a LP meter installation 8
Figure 7 – Arrangement of relocated meter and associated gas fittings 31
List of tables
Table 1 – Appliance gas flow rates for checking meter regulator performance 26
Table A.1 – Diversity factors of appliances for meter sizing 36
5 Foreword
6 a) The Gas Safety (Installation and Use) Regulations 1998 [2].
b) Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004 [3].
c) The Gas Safety (Application) Order (Isle of Man) 1996 [4].
d) The Gas Meters (Information on Connection and Disconnection) Regulations 1996 [5].
e) The Gas Safety (Management) Regulations 1996 [6].
f) The Gas Safety (Management) Regulations (Northern Ireland) 1997 [7].
g) The Gas (Meters) Regulations 1983 (as amended) [8].
h) The Building Regulations 2000 (as amended) [9].
i) The Building (Scotland) Regulations 2004 (as amended) [10].
j) The Building Regulations (Northern Ireland) 2000 (as amended) [11].
k) The Measuring Instruments (EEC Requirements) (Gas Volume Meters) Regulations 1988 (as amended) [12].
7 1 Scope
a) supplied with 2nd family gases from low pressure gas distribution systems with a maximum operating pressure not exceeding 75 mbar, a design minimum pressure of 19 mbar and a design maximum incidental pressure of 200 mbar;
b) only fitted downstream of the emergency control valve;
c) that utilizes a primary meter regulator downstream of the emergency control valve;
d) where the operating pressure at the outlet of the meter is nominally 21 mbar.
2 Normative references
8 3 Terms and definitions
3.1 additional emergency control valve (AECV)
3.2 design maximum incidental pressure (DMIP)
3.3 design minimum pressure (DMP)
3.4 design pressure (DP)
9 3.5 electrical insulator
3.6 emergency control valve (ECV)
3.7 equipotential bond
3.8 filter
3.9 gas fitting
3.10 index
3.11 installation pipework
3.12 interconnecting pipework
3.13 low pressure (LP)
3.14 lowest operating pressure (LOP)
3.15 maximum operating pressure (MOP)
3.16 medium pressure (MP)
3.17 meter
10 3.18 meter box
3.19 meter bracket
3.20 meter compound
3.21 meter exchange
3.22 meter housing
3.23 meter inlet valve (MIV)
11 3.24 meter installation
a) the outlet connection of the meter;
b) the outlet of the meter outlet adaptor if fitted; or
c) in the case of a semi-concealed meter with a pliable connection downstream of the meter, the outlet of the meter box outlet adaptor.
3.25 meter regulator
3.26 non-return valve
3.27 operating pressure
3.28 pliable connector
3.29 pressure absorption
3.30 pressure test point
3.31 semi-concealed meter box
3.32 service pipe
3.33 thermal cut-off device
12 4 Planning and exchange of information
4.1 Consultation
4.2 Dissemination of information
4.3 Scheduling
4.4 Co-ordination of work
13 4.5 Non-return valve
5 Competency
14 6 Design
6.1 General
6.1.1 Arrangement of the meter installation
Figure 1 Arrangement of a LP meter installation (symbols to BS 1553-1)
15 6.1.2 Gas fittings
6.1.3 Gas family
6.1.4 Flow rate
6.2 Pressure absorption
16 6.3 Meter regulator
6.3.1 Position
6.3.2 New regulator
6.3.3 Existing/reused regulator
6.4 Meters
6.4.1 Primary meter
17 6.4.2 Secondary meter
6.4.3 Connections
18 Figure 2 Typical domestic meters
19 Figure 3 Connections on 6 m3/h metal case meter
20 Figure 4 Connections on 6 m3/h plastic case meters intended for semi-concealed installation
21 6.5 Emergency control valve
6.6 Pliable connector
6.7 Pressure test point
6.8 Interconnecting pipework
6.9 Location of meter installation
6.9.1 General
a) as to enable the installation, adjustment, servicing and exchange of the regulator and the exchange of the meter itself;
b) the meter is easily accessible for inspection and meter reading.
a) in close proximity to any source of heat or where it might be subjected to extremes of temperature;
b) where food is stored;
c) where it might be exposed to accidental damage;
d) where it might cause an obstruction;
e) where it might be affected by a damp or corrosive atmosphere (semi-concealed meter installation excepted);
f) where it will constitute a danger to any person;
22 g) any nearer to electrical wiring, switchgear, etc. than the distances in 8.10;
h) at such a low level that there is a significant risk of it being submerged in the event of flooding
i) in an unventilated space.
6.9.2 Location outside the building
a) semi-concealed meter boxes;
b) surface mounted meter boxes;
c) built-in meter boxes; or
d) purpose built housings designed for LP installations.
a) they are impermeable to gas and do not allow escaping gas to enter the wall cavity or property;
b) they give protection against the weather and acts of vandalism;
c) they are resistant to the surface spread of flame in accordance with BS 476-7:1997, Class 2;
d) they are marked with a capital letter “G” as shown in Figure 5d);
e) consumer access is gained only by a special key;
f) the consumer has ready access to the ECV.
24 Figure 5 Typical meter boxes
25 6.9.3 Location inside the building
7 Gas transporter appraisal of primary meter installations
a) approve the type of meter housing, where a housing is to be used;
b) agree, in conjunction with the service installer, the location of the installation and any housing;
c) appraise the pressure control principles to be used;
d) give authorization to an Ofgem approved meter installer (OAMI) to break a seal, set the pressure and re-seal the primary meter regulator to give the correct operating pressure at the outlet of the meter.
26 8 Fitting a meter installation
8.1 General
Figure 6 Typical meter installation
27 8.2 Handling and care
8.3 Pre-installation checks and safety precautions
a) Confirm that the meter installation inlet pipework/fitting is compatible with the outlet connection of the ECV.
b) Confirm that the pressure in the gas service pipe is at LP (i.e. less than 75 mbar) and that the regulator and its connection to the ECV is compatible for connection to a LP gas network.
c) Confirm that the site is ready to accept the completed installation, for example any housing and foundations have been completed.
d) Confirm that the meter housing or meter space provides ventilation and the ECV and meter installation are accessible.
e) Confirm that any electrical equipment installed within the meter housing is suitable for use within a BS EN 60079-10 zone 2 hazardous area.
f) Ensure that the correct parts of the meter installation including fixings, washers and sealing materials, have been supplied for installation in accordance with the design conforming to Clause 6.
g) Ensure that any components within the meter installations that are made of lead are replaced.
h) Visually check that the regulator has been sealed and packaged to prevent debris entering the components prior to delivery to site. Remove the packaging and visually check that the gasways are clean.
i) Ensure that the gas fittings are undamaged and conform to the product standards specified in Clause 6.
j) Ensure that the notices in Clause 11 are available for the meter installation.
28 8.4 Temporary continuity bond
8.5 Main equipotential bonding
29 8.6 Securing the meter
a) the meter and regulator can be supported and installed in a manner that minimizes strain being placed on any connections and allows easy removal and refitting of the meter and regulator;
b) the meter can be fitted and supported so as to restrict movement and reduce the likelihood of tampering;
c) a meter that is to be installed inside a building can be fitted to a meter bracket;
d) a meter that is to be installed in an above ground meter housing can be fitted to a meter bracket that has been fitted within the meter housing;
e) a meter that is to be installed in a semi-concealed meter box can be restrained from movement by either the design of the box or the use of a meter bracket that has been fitted to the box;
f) where a diaphragm meter is used it can only be installed upright and level such that it cannot be readily tilted;
g) the meter and its regulator can be secured such that they are not in direct contact with any wall and shall be protected eith…
8.7 Emergency control valve
a) it is of a type suitable for operating pressures up to 75 mbar;
b) it is sited so as to be easily accessible for operation by the consumer to isolate the gas supply;
c) it is sited so as to permit easy access for operating, servicing and exchanging;
d) it is fitted with a key or lever such that the key or lever cannot be moved in a downward direction to open it and any detachable lever is securely held in place;
e) the “ON” and “OFF” positions and the direction of operation of the ECV are clearly and permanently marked.
30 8.8 Meter regulator
8.9 Pliable connector
8.10 Electrical apparatus adjacent a gas meter
8.11 Multiple meter installations
a) the meters are situated in an area to which there is reasonable access at all times;
b) the meters are enclosed in a single lockable housing or in individual lockable meter boxes;
c) a suitably labelled key for the meter housing is provided for each occupant of the premises the meter serves;
d) each meter or individual meter box is clearly marked to indicate the premises it serves;
e) each individual premises have an appropriately sited AECV as close as practicable to where the installation pipework enters the premises;
f) meter housings are installed, marked or labelled to indicate the property to which each meter relates and that the marking or labelling is permanent and visible when the compartment is closed;
31 g) each individual premises (e.g. each house, flat or maisonette) using a supply of gas is provided with an AECV, whether or not…
9 Gas tightness testing and purging
10 Commissioning of the meter installation
10.1 Regulator
10.1.1 Checks
a) The regulator gives an operating pressure at the outlet of the meter of between 19 mbar and 23 mbar at corresponding flow rat…
b) The regulator locks up at a pressure not exceeding 30 mbar, with no flow through the installation;
c) The regulator is sealed to prevent its setting from being interfered with, without breaking the seal.
32 10.1.2 Adjustment
Table 1 Appliance gas flow rates for checking meter regulator performance
10.2 Meter
a) any prepayment coin or token mechanism is operating correctly;
b) the index is incrementing correctly;
c) for an ultrasonic meter that is not new or does not have an index reading of between 99 997.000 and 99 999.999 the diagnostic functions are reset after installation;
d) the meter index is read and recorded in accordance with Clause 15.
33 11 Notices
11.1 General
11.2 Emergency notices
11.2.1 Primary meter adjacent to the emergency control valve
a) to shut off the supply of gas if there is a gas escape at the premises;
b) to immediately notify the Gas Emergency Service on 0800 111 999, if gas continues to escape;
c) not to reinstate the supply until remedial action has been taken by a competent person to prevent gas escaping again;
d) of details of the emergency service contact, including the emergency telephone number;
e) of the date the notice was first displayed.
11.2.2 Primary meter not adjacent to the emergency control valve
11.2.2.1 Emergency notice at the emergency control valve
a) to shut off the supply of gas if there is a gas escape at the premises;
b) to immediately notify the Gas Emergency Service on 0800 111 999, if gas continues to escape;
c) not to reinstate the supply until remedial action has been taken by a competent person to prevent gas escaping again;
d) of details of the emergency service contact, including the emergency telephone number;
e) of the date the notice was first displayed.
34 11.2.2.2 Emergency notice at the meter
11.3 Emergency control valve
11.4 Service pipe serving more than one primary meter
11.5 Live gas
35 11.6 Installations incorporating a secondary meter
11.6.1 Primary meter
11.6.2 Secondary meters
11.7 Meter housing notice
a) the housing manufacturer’s details;
b) the gas family and MOP for which the housing is intended, e.g. “2nd family gas with a maximum operating pressure not exceeding 75 mbar”.
12 Meter exchange and/or replacement of other gas fitting
12.1 Inspection
36 12.2 Temporary continuity bond
12.3 Carrying out the work
13 Meter relocation
13.1 General
a) altering the position of the gas service pipe;
b) relocating the meter only, in accordance with Figure 7a); or
c) relocating the regulator and meter in accordance with Figure 7b).
a) the owner of the premises;
b) the owner of the meter/meter installation;
c) the relevant gas transporter.
37 Figure 7 Arrangement of relocated meter and associated gas fittings (symbols to BS 1553-1)
38 Figure 7 Arrangement of relocated meter and associated gas fittings (symbols to BS 1553-1) (continued)
13.2 Inspection of existing installation
a) the condition of the gas fittings;
b) the suitability of the proposed location;
c) which type of relocation listed in 13.1.1 is the most practical.
13.3 Design
39 a) the pressure absorption of a primary meter installation will not exceed 4 mbar when the meter is operating at its maximum capacity (this will include any increased pressure absorption imposed by additional gas fittings);
b) its location conforms to 6.9;
c) if a primary meter is being moved, an appraisal has been undertaken by the gas transporter in accordance with Clause 7;
d) within the building the length of interconnecting pipework subjected to gas at distribution pressure is kept to a minimum and does not exceed 2 m.
13.4 Carrying out the work
13.4.1 Gas tightness of existing installation
13.4.2 Temporary continuity bond
13.4.3 Relocation work
a) the meter is more than 2 m from the ECV (existing); or
b) the distance between the primary meter and the ECV (existing) is less than 2 m but the meter is in another room/housing, i.e. not within line of sight or action.
40 13.5 Gas tightness testing and purging
13.6 Commissioning, notices and records
a) commission the meter installation in accordance with Clause 10;
b) fit notices in accordance with Clause 11; and
c) complete records in accordance with Clause 15.
14 Meter removal
41 15 Records
16 Post installation checks
a) all un-used tappings and purge points are capped or plugged with appropriate fittings;
b) the meter regulator has been sealed (with a seal marked with OAMI registration number or the regulator manufacturer’s mark) to prevent its setting from being interfered with, without breaking any seal;
c) the installation pipework has not been connected to the outlet of the meter installation unless it has been gas tightness tested, purged and labelled and all appliances commissioned or disconnected from the gas supply;
d) notices are fitted in accordance with Clause 11;
e) the meter details have been recorded in accordance with Clause 15.
42 Annex A (normative) Sizing of meters
A.1 Diversity factor
Table A.1 Diversity factors of appliances for meter sizing
A.2 Meter size calculation
43 Bibliography
[1] OFGEM. Ofgas Code of Practice for Low Pressure Diaphragm and Electronic Meter Installations with Badged Meter capacities not exceeding 6 m3/h (212 ft3/h) – COP/1a, 1998, London: OFGEM.
[2] GREAT BRITAIN. The Gas Safety (Installation and Use) Regulations 1998, Statutory Instrument 1998, No. 2451, London: HMSO.
[3] NORTHERN IRELAND. The Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004, Statutory Rule 2004, No. 63, London: HMSO.
[4] ISLE OF MAN. Gas Safety (Application) Order (Isle of Man) 1996, Statutory Document 1996, No. 326/96. Hard copies are available from the Health and Safety at Work Inspectorate of the Isle of Man.
[5] GREAT BRITAIN. The Gas Meters (Information on Connection and Disconnection) Regulations 1996, Statutory Document 1996, No. 450, London: HMSO.
44 [6] GREAT BRITAIN. The Gas Safety (Management) Regulations 1996, Statutory Document 1996, No. 551, London: HMSO.
[7] NORTHERN IRELAND. Gas Safety (Management) Regulations (Northern Ireland) 1997, Statutory Rule 1997, No. 195, London: HMSO.
[8] GREAT BRITAIN. The Gas (Meters) Regulations 1983 (as amended), Statutory Document 1983, No. 684, London: HMSO.
[9] GREAT BRITAIN. The Building Regulations 2000 (as amended), Statutory Document 2000, No. 2531, London: HMSO.
[10] GREAT BRITAIN. The Building (Scotland) Regulations 2004 (as amended), Statutory Document 2004, No. 406, London: HMSO.
[11] NORTHERN IRELAND. The Building Regulations (Northern Ireland) 2000 (as amended), Statutory Rule 2000, No. 389, London: HMSO.
[12] GREAT BRITAIN. The Measuring Instruments (EEC Requirements) (Gas Volume Meters) Regulations 1988 (as amended), Statutory Document 1988, No. 296, London: HMSO.
[13] INSTITUTION OF GAS ENGINEERS AND MANAGERS. IGE/TD/4, Recommendations on transmission and distribution practice – Gas services, Edition 3, 1994, Loughborough: IGEM.
[14] GREAT BRITAIN. Gas Act 1986 (as amended by the Gas Act 1995 and incorporating standalone provisions of the Utilities Act 2000). London: HMSO.
[15] INSTITUTION OF GAS ENGINEERS AND MANAGERS. IGE/GM/6, Specification for low pressure diaphragm and rotary displacement meter…
[16] INSTITUTION OF GAS ENGINEERS AND MANAGERS. IGE/GM/7, Gas measurement procedures – Electrical connections and hazardous area classification for gas metering equipment (as amended), 2004, Loughborough: IGEM.
[17] HEALTH AND SAFETY COMMISSION (HSC). L56, Safety in the installation and use of gas systems and appliances. The Gas Safety (Installation and Use) Regulations 1998: Approved Code of Practice and Guidance, Sudbury: HSE Books, 1998, www.hsebooks.co.uk.
[18] INSTITUTION OF GAS ENGINEERS AND MANAGERS. IGE/SR/25, Hazardous area classification of natural gas installations, 2000, Loughborough: IGEM.
[19] INSTITUTION OF GAS ENGINEERS AND MANAGERS. IGE/G/5, Gas installations in multi-occupancy, multi-dwelling buildings, 2006, Loughborough: IGEM.
[20] GREAT BRITAIN. Dangerous Substances and Explosive Atmosphere Regulations 2002, Statutory Instrument 2002, No. 2776, London: HMSO.

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BS 6400-1:2006
$189.07