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1、BRITISH STANDARD BS 5546:1990 Incorporating Amendment Nos. 1 and 2 Specification for Installation of gas hot water supplies for domestic purposes (1st, 2nd and 3rd family gases) UDC 662.76:683.97:696.4:006.3/.8 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrol
2、led Copy, (c) BSI BS 5546:1990 This British Standard, having been prepared under the direction of the Gas Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 May 1990 BSI 01-1999 First published as CP 333-1, September 1947 Second edition May
3、1964 Third edition as BS 5546, October 1979 Fourth edition, May 1990 The following BSI references relate to the work on this standard: Committee reference GSE/30 Draft for comment 87/74761 DC ISBN 0 580 18037 9 Committees responsible for this British Standard The preparation of this British Standard
4、 was entrusted by the Gas Standards Policy Committee (GSE/-) to Technical Committee GSE/30, upon which the following bodies were represented: British Flue and Chimney Manufacturers Association British Gas plc Confederation for the Registration of Gas Installers Consumer Policy Committee of BSI Depar
5、tment of Trade and Industry (Consumer Safety Unit, CA Division) Health and Safety Executive Institute of Domestic Heating and Environmental Engineers Institution of Gas Engineers Liquefied Petroleum Gas Industry Technical Association (UK) Society of British Gas Industries Trades Union Congress The f
6、ollowing bodies were also represented in the drafting of the standard, through subcommittees and panels: Water Research Centre Water Services Association of England and Wales Amendments issued since publication Amd. No.DateComments 6656November 1990 8129March 1994Indicated by a sideline in the margi
7、n Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5546:1990 BSI 01-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Materials and components3 4Selection of system3 5Planning the installation4
8、6Water supply8 7Gas supply12 8Electricity supply13 9Instantaneous water heater installations13 10Installation of combination appliances13 11Installation of vented storage water heaters13 12Installation of unvented storage water heaters of capacity exceeding 15 L14 13Circulator installations15 14Boil
9、er installations17 15Water-jacketed tube heater installations17 16Open-vented circulating systems17 17Showers for bathing20 18Advice to user21 Figure 1 Circulator installation in cylinder/airing cupboard7 Figure 2 Example of a cistern complying with 6.2.19 Figure 3 Examples showing the clear space n
10、eeded above storage cisterns10 Figure 4 Typical large instantaneous water heater installation on cistern supply14 Figure 5 Typical direct circulating system16 Figure 6 Temporary connection to primary circuit16 Figure 7 Typical indirect circulating system18 Table 1 Maximum permissible lengths of unin
11、sulated hot water pipes11 Table 2 Minimum vertical distance between draw-off tap and spill-over level11 Table 3 Maximum interval between pipe supports12 Publications referred to22 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5546:1990
12、ii BSI 01-1999 Foreword This British Standard has been prepared under the direction of the Gas Standards Policy Committee and supersedes BS 5546:1979 which is withdrawn. NOTEIn the preparation of this revision the opportunity has been taken to present this standard in the format of a practice specif
13、ication as defined in PD 6501-1. This format allows the requirements of the specification to be supported by recommendations. To comply with this specification, the user has to comply with all its requirements. He may depart from recommendations, but this would be on his own responsibility and he wo
14、uld be expected to have good reasons for doing so. In the preparation of this standard the opportunity has been taken to include references to combination boilers, showers and 3rd family gases. The following British Standards are relevant to this British Standard: BS 6798 and BS 6700. A British Stan
15、dard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with this British Standard does not of itself confer immunity from legal obligations. In particular, attention is drawn to the following.
16、a) Statutory Instrument 1358:1984: The Gas Safety (Installation and Use) Regulations 1984; b) Statutory Instrument 1065:1985 (as amended): Building Regulations 1985; c) Statutory Instrument 1596:1981 (as amended): The Building Standards (Scotland) Regulations 1981; d) The Water Byelaws; e) The Healt
17、h and Safety at Work, etc. Act 1974. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 22, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicat
18、ed in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5546:1990 BSI 01-19991 1 Scope 1.1 This British Standard specifies the installation requirements for the selection and installation of wa
19、ter heating appliances which supply hot water for domestic purposes in individual dwellings and in other premises where a similar service is required and 1st, 2nd and 3rd family gases are burned. 1.2 This British Standard does not apply to large scale hot water supply systems such as those in multip
20、le dwellings supplied from a central source. NOTEThe titles of the publications referred to in this standard are listed on page 24. 2 Definitions For the purpose of this British Standard the definitions given in BS 1179:1967 and in BS 1179-6 apply, together with the following. 2.1 air vent a non-adj
21、ustable purpose-made opening or duct that is designed to allow the passage of air at all times 2.2 back circulator unit a circulator designed to be installed in a fireplace opening behind a gas fire 2.3 boiler an enclosed vessel in which water is heated by the direct application of heat NOTEIt is pr
22、imarily designed to provide central heating and hot water, but if used solely for supplying hot water, it is capable of supplying a hot water service with a rapid recovery rate. 2.4 combination boiler an appliance designed to provide central heating hot water and domestic hot water without the need
23、for additional secondary storage 2.5 circulator a boiler with a rated input not exceeding 8 kW designed primarily for the supply of domestic hot water in conjunction with a separate storage vessel 2.6 circulation pipe a pipe forming part of the primary circuit of a hot water system 2.7 cistern a fix
24、ed container for holding water at atmospheric pressure 2.8 cold feed pipe a pipe that connects from a feed cistern to a cylinder, storage vessel, or primary side of a closed circuit 2.9 combination hot water storage unit 1) A hot water supply apparatus comprising of a hot water storage vessel with a
25、 cold water feed cistern immediately above it, the two being fabricated together as a compact unit. 2) A hot water supply apparatus comprising a hot water storage vessel with a cold water feed cistern beside it or inside it. 2.10 compartment an enclosure specifically designed or adapted to house a w
26、ater heater 2.11 condensing appliance an appliance designed to make use of the latent heat in the combustion products water vapour by condensing the water vapour within the appliance 2.12 direct cylinder a closed hot water storage vessel in which the stored hot water has been directly heated in a bo
27、iler or circulator 2.13 distributing pipe any pipe other than an overflow pipe or flush pipe conveying water from a storage cistern or from a hot water apparatus supplied from a feed cistern, and under pressure from that cistern or apparatus 2.14 domestic water water supplied by the water supplier f
28、or drinking, washing, cooking and sanitary purposes including hot water supplied through any outlet 2.15 double-feed indirect cylinder any indirect cylinder that requires a separate feed cistern to both the primary and the secondary circuit 2.16 draining tap a tap fitted to drain off the contents of
29、 a water system pipe or vessel 2.17 feed cistern any storage cistern used for supplying cold water to a hot water apparatus, cylinder or tank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5546:1990 2 BSI 01-1999 2.18 float-operated valv
30、e a valve for controlling the flow of water into a cistern, the valve being operated by the vertical movement of a float riding on the surface of the water 2.19 flow pipe a pipe in a primary hot water circuit in which water moves away from the boiler or circulator 2.20 flueless appliance an applianc
31、e designed for use without connection to a flue, the products of combustion being allowed to mix with the air of the room or space in which the appliance is situated 2.21 hot water storage vessel a vessel for storing hot water under pressure greater than atmospheric pressure 2.22 indirect cylinder a
32、ny hot water cylinder in which the stored water is heated by the primary heater through which hot water is circulated from a boiler or circulator without mixing of the primary or secondary water taking place 2.23 indirect-heated water-jacketed tube heater a water-jacketed tube heater which requires
33、a separate water heating appliance, e.g. boiler or circulator 2.24 instantaneous water heater an appliance in which water is heated only as it flows to the point of delivery 2.25 open-flued appliance an appliance designed to be connected to an open-flue system, its combustion air being drawn from th
34、e room or space in which it is installed 2.26 primary circuit a circuit in which water circulates between a boiler or circulator and a hot water storage vessel 2.27 return pipe a pipe in a primary hot water circuit in which water moves back to the boiler or circulator 2.28 room-sealed appliance an a
35、ppliance which, when in operation, has the combustion air inlet and the combustion products outlet isolated from the room or space in which the appliance is installed 2.29 safety valve a pressure relief valve fitted on or close to a boiler or circulator 2.30 servicing valve a valve for shutting off
36、the flow of water in a pipe connected to a water fitting to facilitate the maintenance or servicing of that fitting 2.31 single-feed indirect cylinder an indirect cylinder which has only one cold feed pipe connection to supply both the primary and secondary circuits NOTEIt is so designed that the fo
37、rmation of an air seal during filling prevents mixing and accommodates the expansion of the primary circuit. 2.32 stopvalve a valve, other than a servicing valve, fitted in a pipeline for controlling or stopping the flow of water when necessary 2.33 storage water heater an appliance in which a volum
38、e of water is heated under thermostatic control and stored for use when required 2.34 warning pipe an overflow pipe so fixed that its outlet, whether inside or outside a building, is in a conspicuous position where the discharge of any water from it can readily be seen 2.35 water service pipe any pi
39、pe that supplies water from a main to any premises, and that is subject to water pressure from that main, or would be so subject but for the closing of a stopvalve 2.36 direct storage system a system in which the hot water supplied from a storage vessel to the draw-off taps has been heated directly
40、in a boiler or circulator Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5546:1990 BSI 01-19993 2.37 indirect storage system a system in which the hot water supply to the draw-off taps has been heated and stored in an indirect cylinder a
41、nd has not passed through the boiler or circulator 2.38 large instantaneous water heater a water heater with a heat input exceeding 12 kW intended to supply hot water to a bath or a comprehensive service to a number of draw-off points 2.39 large storage water heater a storage system with an integral
42、 storage vessel that is intended to supply hot water to a bath or a comprehensive service to a number of draw-off points 2.40 storage system a system in which water is heated and held in a storage vessel 2.41 small instantaneous water heater a water heater with a heat input not exceeding 12 kW inten
43、ded to supply hot water to a sink or basin 2.42 small storage water heater a storage system with an integral storage vessel that is intended to supply water to a sink or basin 2.43 water-jacketed tube heater an appliance in which the primary hot water, which may be used for heating purposes, is stor
44、ed and the water for domestic use is drawn off after being heated inside a coil sited within the stored hot water 2.44 vent pipe a pipe connected to an open water system and communicating with the atmosphere 3 Materials and components All materials and components used shall comply with the relevant
45、requirements of the appropriate British Standards. Where no appropriate British Standard exists, materials and components shall be designed, constructed and installed so that the safety of persons is not put at risk, and the materials and components shall be acceptable to the gas supplier and the wa
46、ter supplier. Materials containing asbestos shall not be used. When used under the conditions for which they are designed, materials in contact with or likely to come into contact with potable water shall not constitute a toxic hazard, shall not support microbial growth and shall not give rise to un
47、pleasant taste or odour, cloudiness or discoloration of the water. COMMENTARY AND RECOMMENDATIONS ON CLAUSE 3. Copper tubing in accordance with BS 2871-1 and capillary or compression fittings to BS 864-2 should be used for all water supply pipes subject to the approval of the local water supplier. O
48、ther materials may be used, but only in consultation with the water supplier (see also BS 6920). Products for installation and use in the United Kingdom which are verified and listed under the U.K. Water Fittings Byelaws Scheme, administered by W.R.C. Water Byelaws Advisory Service, 660, Ajax Avenue
49、, Slough, SL1 4BG, are deemed to satisfy the requirements of this clause. 4 Selection of system 4.1 The choice of system shall be made to suit the requirements of the user, bearing in mind locations, quantities, temperature, cost (including maintenance and fuel costs) water delivery rate and the characteristics of the different systems. COMMENTARY AND RECOMMENDATIONS ON 4.1. Combination boilers with no water storage capacity have typical hot water delivery rates between 6 L/min and 9 L/min with a 45 C rise. Where the combination boiler incorporates primary wa
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