《BS-5342-1985.pdf》由会员分享，可在线阅读，更多相关《BS-5342-1985.pdf（10页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 5342:1985 Specification for Rubber hoses for high-pressure saturated steam UDC 621.643.3-036.4:621.6.023 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5342:1985 This British Standard, having been prepared under the d
2、irection of the Rubber Standards Committee, was published under the authority of the Board of BSI and comes into effect on 28 February 1985 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
3、/9 Draft for comment 82/55697 DC ISBN 0 580 14175 6 Committees responsible for this British Standard The preparation 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 Corporatio
4、n British Rubber Manufacturers Association Chief and Assistant Chief Fire Officers Association Department of the Environment (Property Services Agency) Fire Extinguishing Trades Association Health and Safety Executive Home Office Institution of Fire Engineers Institution of Mechanical Engineers Liqu
5、ified Petroleum Gas Industry Technical Association (UK) London Fire Brigade London Transport Executive Malaysian Rubber 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
6、 of the standard, through subcommittees and panels: Association of Hydraulic Equipment Manufacturers British Plastics Federation British Railways Board Engineering Equipment and Materials Users Association Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun s
7、heffieldun, na, Fri Dec 01 14:31:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5342:1985 BSI 09-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Classification1 4Construction1 5Dimensions and permissible deviations1 6Physical properties of the cover2
8、7Performance requirements2 8Marking2 Appendix A Test for resistance to steam3 Table 1 Nominal bores and permissible deviation1 Table 2 Permissible deviations on cut lengths1 Table 3 Hydrostatic pressure requirements2 Table 4 Steam resistance requirements2 Table 5 Mandrel sizes3 Publications referred
9、 to4 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5342:1985 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 wi
10、thdrawn. 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 include
11、d for 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
12、 performance 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 st
13、eam hoses. 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 st
14、eam Specification” published by the International Organization for Standardization (ISO), but differs from ISO 6134 in the following respects: a) there is no type equivalent to type 1 with a working pressure of 6.0 bar (0.6 MPa); b) the use of textile reinforcement is not specified; c) a nominal bor
15、e of 44.5 mm 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., Act 1974 and the need to ensure tha
16、t hoses specified 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 o
17、f a contract. 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, pages 1 to 4, an inside
18、 back cover and 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. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:41 GMT+00:00 2006, Uncontrolled Copy, (c)
19、BSI BS 5342:1985 BSI 09-19991 1 Scope This British Standard specifies the requirements for the construction, physical properties 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 res
20、istant cover. NOTEThe titles of the publications referred to in this standard are listed on page 4. 2 Definitions For the purposes of this British Standard, the definitions given in BS 3558 apply. 3 Classification Rubber hoses specified in this standard shall be classified as follows. Type 1: semi-h
21、igh-pressure steam hose with maximum working pressure 10 bar 1). Type 2: high-pressure steam hose with maximum working pressure 16 bar. 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 o
22、f: a) seamless rubber lining; b) wire reinforcing layer or layers, complying with the requirements of BS 3592-2; NOTEWire reinforcing 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 defec
23、ts. All rubber components shall be of heat-resistant rubber. 4.2 The hoses shall be mandrel made and the finish shall be smooth or fabric marked. 4.3 The rubber cover shall be perforated with a minimum of 280 holes per metre, in four rows equally spaced around the periphery, to relieve possible pres
24、sure build-up between the plies. 4.4 The end fittings used with the hose shall be of a type that provides for tightening up during 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
25、manufacturer. 5 Dimensions and permissible deviations 5.1 Bore When measured as described in clause 3 BS 5173-1:1976, the bore of the hose shall be in accordance with the nominal bores and permissible deviations given in Table 1. Table 1 Nominal bores and permissible deviations 5.2 Lining and cover
26、thickness When measured in accordance with the method described in BS 5173-1, the minimum thickness of the lining shall be 2.5 mm and the minimum thickness of the cover shall be 1.5 mm. The variation in thickness of lining or cover shall not exceed 15 % of the measured mean thickness, excluding cove
27、r overlaps. 5.3 Concentricity When measured in accordance with the method described in BS 5173-1, the variation from concentricity measured between inside and outside diameters shall not exceed 2.0 mm. 5.4 Permissible deviations on cut lengths of hoses The permissible deviations on cut lengths of ho
28、ses shall be as shown in Table 2. Table 2 Permissible deviations on cut lengths 1) 1 bar = 105 N/m2 = 100 kPa. Nominal bore Permissible deviations mmmm 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 Ove
29、r 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 mm 9 mm 12 mm 1 % of nominal length Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5342:1985 2 BSI
30、 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 not greater than 100 %. 6.2 Resistance to ozone When
31、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 described in BS 5173-3, the adhesion between lining an
32、d 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 BS 5173-2, the hoses shall comply with the requirements of Table 3 and shall show no cracks or leaks at proof pressure. 7.2.2 A
33、ll 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 of Table 4, the lining shall not be cracked or pop-corned (an eruption evident on t
34、he 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 h test. When tested in accordance with the method described in Appendix A, the lining shall not
35、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 marked and also labelled with a tag tied at e
36、ach 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) the design working pressure. This information sha
37、ll be stated in the following form: MR/BS 5342/1A/19 mm/January 1985/10 bar. PropertyType 1Type 2 Design working pressure 10 bar16 bar Proof pressure50 bar80 bar Change in diameter at proof pressure + 15 %, 5 % + 15 %, 5 % Change in length at proof pressure 12 % 12 % Maximum twist at proof pressure
38、30/m30/m Minimum burst pressure 100 bar160 bar 70+2 0 h PropertyMinimum requirements Mean burst pressure90 % 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 piece Mean elongation at break of lining after steaming N
39、ot less than 50 % of mean non-steamed value with a minimum figure of 150 % 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 such a claim is therefore solely the manufacturers r
40、esponsibility. 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 or to the appropriate authority for other certific
41、ation marks. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5342:1985 BSI 09-19993 Appendix A Test for resistance to steam A.1 Test pieces Cut six lengths of hose each with fittings to give minimum lengths of 1 m between the end fittings
42、. A.2 Procedure A.2.1 168 h test. Select any two test pieces and subject them for 168 2 h to flowing saturated steam using method B described in clause 11 of BS 5173-3:1977, at a pressure of 10 0.5 bar for type 1 hose and 16 0.5 bar for type 2 hose. Allow the test pieces to cool and then, at room te
43、mperature, bend them four times through 180 for nominal bore sizes up to and including 31.5 mm 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”. T
44、able 5 Mandrel sizes A.2.1.1 Mark two test pieces through which steam 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 9
45、03-A26 and the elongation at break of the lining rubber as described 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 pressu
46、re described in A.2.1 for 750 5 h and report the condition of the hose and 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
47、) individual values for elongation at break of hose lining; f) mean elongation 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 5 h steaming, including stiffening, cover cra
48、cking, leaks (not due to fittings), condition of lining and hose bursts. Nominal boreMandrel radius mmmm 12.5 16 19 25 31.5 38 44 51 150 190 230 300 375 455 540 600 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5342:1985 4 BSI 09-1999 P
49、ublications 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 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 5173-2, Hydra