BS-8451-2004.pdf
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1、BRITISH STANDARD BS 8451:2004 Rubber hoses for gas welding, cutting and allied processes High kink-resistant heavy duty welding hose (type H) Specification ICS 25.160.30; 83.140.40 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:06:14 GMT+00:00 2006, Uncont
2、rolled Copy, (c) BSI BS 8451:2004 This British Standard, having been prepared under the direction of the Standards Policy and Strategy Committee comes into effect on 1 March 2004 BSI 1 March 2004 The following BSI references relate to the work on this British Standard: Committee reference PRI/66/1 D
3、raft for comment 03/310327 DC ISBN 0 580 43363 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee PRI/66, Rubber and plastics tubing, hoses and hoses assemblies, to Subcommittee PRI/66/1, Industrial, chemical and petrochem
4、ical applications, upon which the following bodies were represented: Energy Industries Council Fire Extinguishing Trades Association Institute of Petroleum London Fire b) an abrasion resistance requirement; c) a more stringent adhesion requirement; d) requirements for crush and high kink resistance.
5、 In addition, marking of the hose has been increased to half metre intervals. WARNING. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user
6、from legal obligations relating to health and safety at any stage. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
7、 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: London South Bank University, London South Bank University,
8、Fri Dec 08 02:06:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8451:2004 BSI 1 March 2004 1 1 Scope This British Standard specifies requirements for two classes of flexible rubber hose for gas welding and allied processes for use up to a maximum working pressure of 20 bar1) over the temperature r
9、ange 25 C to +70 C. There is no subdivision of the classes because only the high kink resistant hose is specified. Type H hoses for gas welding, cutting and allied processes are mainly intended for use in long lengths in the construction and military sectors where the full length of hose might not b
10、e visible to the welding operative. NOTEThe hose is designated Type H, to maintain a relationship with BS 5120:1987. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the reference cited applies. For undated r
11、eferences, the latest edition of the referenced document (including any amendments) applies. BS 572:1985, Specification for interchangeable conical ground glass joints. BS 903-A2:1995, Physical testing of rubber Method for determination of tensile stress-strain properties. (ISO 37:1994) BS 903-A35,
12、Physical testing of rubber Temperatures, humidities and times for conditioning and testing of test pieces. (ISO 471) BS EN 560, Gas welding equipment Hose connections for welding, cutting and allied processes. BS EN 28033, Rubber and plastics hose Determination of adhesion between components. (ISO 8
13、033) BS EN 27326:1993, Rubber and plastics hoses. Assessment of ozone resistance under static conditions. (ISO 7326:1991) BS EN ISO 1307, Rubber and plastics hoses for general-purpose industrial applications Bore diameters and tolerances, and tolerances on length. BS EN ISO 1402:1997, Rubber and pla
14、stics hoses and hose assemblies Hydrostatic testing. BS EN ISO 1746, Rubber or plastics hoses and tubing Bending tests. BS EN ISO 4080:1995, Rubber and plastics hoses and hose assemblies Determination of permeability to gas. BS EN ISO 4671, Rubber and plastics hoses and hose assemblies Methods of me
15、asurement of dimensions. BS EN ISO 4672:1999, Rubber and plastics hoses Sub-ambient temperature flexibility tests. BS EN ISO 8330, Rubber and plastics hoses and hose assemblies Vocabulary. BS ISO 188:1998, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests. (BS 903-A19:
16、1998) BS ISO 1817:1999, Rubber vulcanized Determination of the effect of liquids. (BS 903-A16:1999) BS ISO 4649:2000, Rubber, vulcanized or thermoplastic Determination of abrasion resistance using a rotating cylindrical drum device. 3 Terms and definitions For the purposes of this British Standard,
17、the definitions given in BS EN ISO 8330 apply. 1) 1 bar = 105 N/m2 = 105 Pa. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:06:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8451:2004 2 BSI 1 March 2004 4 Classification Two classes of hose shall be specifi
18、ed, dependent upon use: a) Class A: for use with acetylene, oxygen and non-combustible gases such as argon; b) Class B: for gas cutting and welding applications using liquefied petroleum gases (LPGs). 5 Materials and construction The hose shall consist of: a) a rubber lining of minimum thickness 1.5
19、 mm; b) reinforcement applied by any suitable technique; c) a rubber cover of minimum thickness two millimetres. The lining and cover shall be of uniform thickness, free from air holes, porosity and other defects. The hose shall be mandrel or non-mandrel made and the finish shall be smooth, fluted o
20、r fabric marked. 6 Colour identification In order to identify the gas for which the hose is intended to be used, the hose cover shall be coloured in accordance with Table 1. Table 1 Colour of hose cover 7 Dimensions and tolerances 7.1 Bore sizes When measured in accordance with BS EN ISO 4671, the d
21、imensions of the bore of the hose shall conform to Table 2. Table 2 Nominal bore 7.2 Cut lengths and tolerances The tolerances on nominal lengths specified by the purchaser shall be in accordance with BS EN ISO 1307. ClassGasColour of cover AAcetylene and other fuel gases, excluding LPGRed AOxygenBl
22、ue ANon-combustible gases, e.g. argonBlack BLiquefied petroleum gas (LPG), e.g. propane, butane and mixtures of propane and butane Orange Nominal boreInternal diameter and tolerancesMaximum concentricity mmmm 4.04.0 0.551.00 5.05.0 0.55 6.36.3 0.55 8.08.0 0.651.25 10.010.0 0.65 12.512.5 0.70 16.016.
23、0 0.70 19.019.0 0.751.50 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:06:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8451:2004 BSI 1 March 2004 3 8 Physical properties of lining and cover 8.1 Tensile strength and elongation at break When tested in acc
24、ordance with BS 903-A2:1995, the rubber used in the lining and cover of the hose shall have a tensile strength and elongation at break no less than the values given in Table 3. Table 3 Tensile strength and elongation at break 8.2 Accelerated ageing When aged in accordance with BS ISO 188:1998 for 16
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