1、BRITISH STANDARD BS 5342:1985 Specification for Rubber hoses for high-pressure saturated steam UDC 621.643.3-036.4:621.6.023BS5342:1985 This British Standard, having been prepared under the directionof the Rubber StandardsCommittee, was published under the authority ofthe Board of BSI and comes into
2、effect on 28February1985 BSI 09-1999 First published February 1977 First revision February 1985 The following BSI references relate to the work on this standard: Committee reference RUM/9 Draft for comment 82/55697 DC ISBN 0 580 14175 6 Committees responsible for this British Standard The preparatio
3、n of this British Standard was entrusted by the Rubber Standards Committee (RUM/-) to Technical Committee RUM/9, upon which the following bodies were represented: British Gas Corporation British Rubber Manufacturers Association Chief and Assistant Chief Fire Officers Association Department of the En
4、vironment (Property Services Agency) Fire Extinguishing Trades Association Health and Safety Executive Home Office Institution of Fire Engineers Institution of Mechanical Engineers Liquified Petroleum Gas Industry Technical Association (UK) London Fire Brigade London Transport Executive Malaysian Ru
5、bber Producers Research Association Ministry of Defence National Coal Board Society of Motor Manufacturers and Traders Limited The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Hydraulic Equipment Manufacturers British Plasti
6、cs Federation British Railways Board Engineering Equipment and Materials Users Association Amendments issued since publication Amd. No. Date of issue CommentsBS5342:1985 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Classification 1 4 C
7、onstruction 1 5 Dimensions and permissible deviations 1 6 Physical properties of the cover 2 7 Performance requirements 2 8 Marking 2 Appendix A Test for resistance to steam 3 Table 1 Nominal bores and permissible deviation 1 Table 2 Permissible deviations on cut lengths 1 Table 3 Hydrostatic pressu
8、re requirements 2 Table 4 Steam resistance requirements 2 Table 5 Mandrel sizes 3 Publications referred to 4BS5342:1985 ii BSI 09-1999 Foreword This revision of this British Standard has been prepared under the direction of the Rubber Standards Committee, and supersedes BS 5342:1977 which is withdra
9、wn. It specifies two types of rubber hoses for use at different working pressures each with two classes of resistant cover. The principal changes from the 1977 edition are as follows: a) each hose type has been specified with and without an oil resistant cover and a requirement has been included for
10、 the oil resistance; b) a requirement for uniformity of the lining and cover thickness has been added; c) a requirement for the resistance to ozone and the perforation of the cover has been added; d) a requirement for the concentricity of hoses has been added. The standard principally specifies perf
11、ormance and construction requirements. In order to take account of modern technological developments, no requirements are included for specific materials, constructions and manufacturing methods. Attention is drawn to BS 5122 which covers the requirements for low-pressure and medium-pressure steam h
12、oses. In the absence of a suitable method of test no requirement is specified for abrasion resistance of the cover or resistance to chemicals which may be contained in carry over. Correspondence with International Standards. This British Standard is related to ISO 6134:1981 “Rubber hoses for steam S
13、pecification” published bythe International Organization for Standardization (ISO), but differs from ISO6134 in the following respects: a) there is no type equivalent to type 1 with a working pressure of6.0bar(0.6MPa); b) the use of textile reinforcement is not specified; c) a nominal bore of 44.5 m
14、m is specified whilst 40, 50, 63 and 80 mm are not specified; d) the method of exposure to steam for assessment of resistance to steam is more precise; e) marking requirements are specified. Attention is also drawn to the Health and Safety at Work etc., Act1974 and the need to ensure that hoses spec
15、ified in this standard are installed in such a way that personnel are adequately protected. Certification. Attention is drawn to the certification facilities described on the inside back cover of this standard. A British Standard does not purport to include all the necessary provisions of a contract
16、. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover a
17、nd a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5342:1985 BSI 09-1999 1 1 Scope This British Standard specifies the requirements forthe construction, physical prop
18、erties and performance of two types of rubber hoses for high-pressure saturated steam. Each type is further divided into two classes having either an oil resistant or non-oil resistant cover. NOTEThe titles of the publications referred to in this standard are listed on page 4. 2 Definitions For the
19、purposes of this British Standard, the definitions given in BS3558 apply. 3 Classification Rubber hoses specified in this standard shall be classified as follows. Type 1: semi-high-pressure steam hose with maximum working pressure 10bar 1) . Type 2: high-pressure steam hose with maximum working pres
20、sure16bar. Each type of hose shall be further divided into Class A: a non-oil resistant cover, or Class B: an oil resistant cover. 4 Construction 4.1 The hoses shall consist of: a) seamless rubber lining; b) wire reinforcing layer or layers, complying with the requirements of BS 3592-2; NOTEWire rei
21、nforcing layers may be applied by any suitable technique. c) rubber cover. The lining and cover shall be free from holes, except as called for in 4.3, porosity and other defects. All rubber components shall be of heat-resistant rubber. 4.2 The hoses shall be mandrel made and the finish shall be smoo
22、th or fabric marked. 4.3 The rubber cover shall be perforated with a minimum of280holes per metre, in four rows equally spaced around the periphery, to relieve possible pressure build-up between the plies. 4.4 The end fittings used with the hose shall be of a type that provides for tightening up dur
23、ing service, such as the bolted clamp type, to compensate for creep of the rubber compounds. NOTEThe end fittings used with the hose should be those recommended by the hose manufacturer. 5 Dimensions and permissible deviations 5.1 Bore When measured as described in clause3 BS 5173-1:1976, the bore o
24、f the hose shall be in accordance with the nominal bores and permissible deviations given inTable 1. Table 1 Nominal bores and permissible deviations 5.2 Lining and cover thickness When measured in accordance with the method described in BS 5173-1, the minimum thickness of the lining shall be2.5mm a
25、nd the minimum thickness of the cover shall be1.5mm. The variation in thickness of lining or cover shall not exceed15% of the measured mean thickness, excluding cover overlaps. 5.3 Concentricity When measured in accordance with the method described in BS 5173-1, the variation from concentricity meas
26、ured between inside and outside diameters shall not exceed2.0mm. 5.4 Permissible deviations on cut lengths of hoses The permissible deviations on cut lengths of hoses shall be as shown in Table 2. Table 2 Permissible deviations on cut lengths 1) 1bar = 10 5N/m 2= 100kPa. Nominal bore Permissible dev
27、iations mm mm 12.5 16 19 25 31.5 38 44.5 51 0.75 Nominal length of hose Permissible deviations mm Up to and including 300 Over 300 and up to and including 600 Over 600 and up to and including 900 Over 900 and up to and including 1 200 Over 1 200 and up to and including 1 800 Over 1 800 3 mm 4.5 mm 6
28、 mm 9 mm 12 mm 1% of nominal length BS5342:1985 2 BSI 09-1999 6 Physical properties of the cover 6.1 Resistance to liquids (class B hoses) When tested in accordance with the volumetric method described in BS 903-A16, using oil No. 3 and immersing for at 100 1 C, the cover shall have a volume change
29、not greater than100%. 6.2 Resistance to ozone When tested in accordance with the method described in BS 5173-6, using an elongation of 20% at 40 2 C for 168 1 h, no cracking shall be visible under 2 magnification. 7 Performance requirements 7.1 Adhesion When tested in accordance with the method desc
30、ribed in BS 5173-3, the adhesion between lining and reinforcement, and between cover and reinforcement shall be not less than 2.0 N/mm. 7.2 Pressure requirements 7.2.1 When tested in accordance with the method described in BS5173-2, the hoses shall comply with the requirements ofTable 3 and shall sh
31、ow no cracks or leaks at proof pressure. 7.2.2 All manufactured lengths of hose shall be tested at proof pressure. 7.3 Steam resistance 7.3.1 168 h test. When tested in accordance with the method described in Appendix A, the hose shall comply with the requirements ofTable 4, the lining shall not be
32、cracked or pop-corned (an eruption evident on the surface of a hose lining after exposure to pressurized steam) and the cover shall not be cracked or blistered. Table 3 Hydrostatic pressure requirements Table 4 Steam resistance requirements 7.3.2 750 htest. When tested in accordance with the method
33、described in Appendix A, the lining shall not be cracked or pop-corned and the cover shall not be cracked or blistered. There shall be no leakage of steam through the walls of the hose. NOTEAny leakage at the coupling shall be ignored. 8 Marking Each manufactured length of hose shall be continuously
34、 marked and also labelled with a tag tied at each end of the hose with the following information: a) the hose manufacturers name or identification; b) the number of this British Standard 2) , with the type and class number as suffixes; c) the nominal bore; d) the month and year of manufacture; e) th
35、e design working pressure. This information shall be stated in the following form: MR/BS 5342/1A/19 mm/January 1985/10 bar. Property Type 1 Type 2 Design working pressure 10 bar 16 bar Proof pressure 50 bar 80 bar Change in diameter at proof pressure + 15%, 5% + 15 %, 5% Change in length at proof pr
36、essure 12% 12% Maximum twist at proof pressure 30 /m 30 /m Minimum burst pressure 100 bar 160 bar 70 +2 0h Property Minimum requirements Mean burst pressure 90 % of mean value for hoses not exposed to steam Hardness of lining after steaming Not more than 10 IRHD above value for non-steamed test piec
37、e Mean elongation at break of lining after steaming Not less than 50 % of mean non-steamed value with a minimum figure of150% 2) Marking BS 5342 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The accuracy of s
38、uch a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification to support such claims should be addressed to the Director, Quality Assurance Division, BSI, PO Box 375, Milton Keynes MK 14 6LO for certification marks administered by BSI
39、 or to the appropriate authority for other certification marks.BS5342:1985 BSI 09-1999 3 Appendix A Test for resistance to steam A.1 Test pieces Cut six lengths of hose each with fittings to give minimum lengths of1m between the end fittings. A.2 Procedure A.2.1 168 h test. Select any two test piece
40、s and subject them for 168 2h to flowing saturated steam using method B described in clause11 of BS5173-3:1977, at a pressure of10 0.5bar for type 1hose and 16 0.5bar for type 2hose. Allow the test pieces to cool and then, at room temperature, bend them four times through 180 for nominal bore sizes
41、up to and including 31.5mm and through 90 for larger bore sizes, over a mandrel of appropriate radius given in Table 5, rotating the test piece through 90 between each bending. After bending, mark these test pieces “steamed hose”. Table 5 Mandrel sizes A.2.1.1 Mark two test pieces through which stea
42、m has not flowed “non-steamed hose”. A.2.1.2 Determine the burst pressure of all four test pieces as described in BS 5173-2. A.2.1.3 Cut open the four test pieces and determine the hardness by the micro-test method described in BS 903-A26 and the elongation at break of the lining rubber as described
43、 in BS 903-A2 using the type 2 dumb-bell. Record the hardness and elongation at break of the lining for the four test pieces. A.2.2 750 h test. Subject two further samples of hose to flowing saturated steam at the appropriate pressure described inA.2.1 for7505h and report the condition of the hose a
44、nd any failure. A.3 Calculation and report Calculate and report the following information: a) date of test; b) individual burst pressures; c) mean burst pressure of “steamed hose”; d) mean burst pressure of “non-steamed hose”; e) individual values for elongation at break of hose lining; f) mean elon
45、gation at break of “non-steamed hose” lining; g) mean elongation at break of “steamed hose” lining; h) hardness of non-steamed and steamed hose lining; i) condition of hose after 750 5h steaming, including stiffening, cover cracking, leaks (not due to fittings), condition of lining and hose bursts.
46、Nominal bore Mandrel radius mm mm 12.5 16 19 25 31.5 38 44 51 150 190 230 300 375 455 540 600BS5342:1985 4 BSI 09-1999 Publications referred to BS 903, Methods of testing vulcanized rubber. BS 903-A2, Determination of tensile stress-strain properties. BS 903-A16, The resistance of vulcanized rubber
47、to liquids. BS 903-A26, Determination of hardness. BS 3558, Glossary of rubber terms. BS 3592, Steel wire for rubber hose reinforcement. BS 3592-2, Coated patented steel wire. BS 5122, Rubber hose for saturated steam. BS 5173, Methods of test for hoses. BS 5173-1, Measurement of dimensions. BS 5173-
48、2, Hydraulic pressure tests. BS 5173-3, General physical tests. BS 5173-6, Environmental tests. ISO 6134, Rubber hoses for steam Specification 3) . 3) Referred to in the foreword only.BS5342:1985 BSI 09-1999 BSI certification marks A licence to use the Kitemark or “Safety Mark” on or in relation to
49、a product will be granted to any manufacturer or producer who demonstrates that he can and will be able consistently to make that product to the requirements specified in the British Standard product specification. His capability of doing so is initially established by assessment of his production process, quality control organization and test facilities against the required Part of BS 5750 “Quality systems”, and by testing the product against all the criteria of the relevant standard
