1、BRITISH STANDARD BS5122:1986 Specification for Rubber hoses for low-pressure and medium-pressure saturated steam UDC621.643.3-036.4:678.066-462:621.186.3.013.1BS5122:1986 This British Standard, having been prepared under the directionof the Rubber StandardsCommittee, was published under the authorit
2、y ofthe Board of BSI and comes intoeffect on 31 December1986 BSI09-1999 First published June1975 First revision December1986 The following BSI references relate to the work on this standard: Committee reference RUM/9 Draft for comment85/38743DC ISBN 0 580 15461 0 Committees responsible for this Brit
3、ish 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 Coal British Gas Corporation British Rubber Manufacturers Association Chief and Assistant Chief Fire O
4、fficers Association Department of the Environment (Property Services Agency) Fire Extinguishing Trades Association Health and Safety Executive Home Office Institution of Fire Engineers London Fire Brigade London Transport Executive Malaysian Rubber Producers Research Association Ministry of Defence
5、Society of Motor Manufacturers and Traders Limited Water Authorities Association The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Hydraulic Equipment Manufacturers British Railways Board Energy Industries Council Engineering
6、 Equipment and Materials Users Association Amendments issued since publication Amd. No. Date of issue CommentsBS5122:1986 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Classification 1 4 Construction 1 5 Dimensions and tolerances 1 6 Ph
7、ysical 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 deviations 1 Table 2 Permissible deviations on cut lengths 1 Table 3 Hydrostatic pressure requirements 2 Table 4 Steam resistance requirements 2 T
8、able 5 Mandrel sizes 3 Publications referred to Inside back coverBS5122:1986 ii BSI 09-1999 Foreword This revision of this British Standard has been prepared under the direction of the Rubber Standards Committee and supersedes BS5122:1975 which is withdrawn. The principal changes from the 1975 editi
9、on are as follows: a) the hoses are classified as being with or without an oil resistant cover and are then divided into types according to the design working pressure; b) the requirement for uniformity of the lining and cover thickness is more precise; c) a requirement for the resistance to ozone a
10、nd the perforation of the cover has been added; d) a requirement for the concentricity of hoses has been added; e) the method of exposure to steam for assessment of resistance to steam is more precise; f) a requirement for marking the hose (as well as labelling with a tag) has been added. The standa
11、rd principally specifies 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 BS5342 which covers the requirements for high-pressur
12、e steam hoses. In the absence of a suitable method of test no requirement is specified for the abrasion resistance of the cover of these hoses. When a suitable test method is available it will be incorporated in the standard together with a requirement. Itshould be recognized, however, that adequate
13、 abrasion resistance is essential. In the preparation of this standard consideration was given to ISO6134, published by the International Organization for Standardization (ISO). Attention is also drawn to the Health and Safety at Work etc.,Act1974 and the need to ensure that hoses specified in this
14、standard are installed in such a way that personnel are adequately protected. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself con
15、fer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to4, 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 indicated in
16、 the amendment table on the inside front cover.BS5122:1986 BSI 09-1999 1 1 Scope This British Standard specifies the requirements for the construction, physical properties and performance of two classes of rubber hoses having either an oil resistant or non-oil resistant cover. Each class is further
17、divided into two types for low-pressure and medium-pressure saturated steam. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard, the definitions given in BS3558 apply. 3 Classification Rubber ho
18、ses specified in this standard shall be classified as follows: Class A: having a non-oil resistant cover; Class B: having an oil resistant cover. Each class of hose shall be further divided into Type1: low-pressure steam hose with maximum working pressure2bar 1) ; Type2: medium-pressure steam hose w
19、ith maximum working pressure5bar. 4 Construction 4.1 The hoses shall consist of: a) seamless rubber lining; b) textile reinforcing layer or layers; NOTETextile reinforcing layers may be applied by any suitable technique. c) rubber cover. The lining and cover shall be free from holes, except as speci
20、fied in4.3, porosity and other defects. 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 of280 holes per metre, in four rows equally spaced around the periphery, to relieve possible pressure build-up between
21、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. 5 Dimensions and tolerances 5.1 Bore When measured in accordance with the method described in BS5173-1
22、01.1, the bore of the hose shall be as given in Table 1. Table 1 Nominal bores and permissible deviations 5.2 Lining and cover thickness When measured in accordance with the method described in BS5173-101.1, the minimum thickness of the lining shall be2.0mm and the minimum thickness of the cover, ex
23、cluding overlaps, 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 BS5173-101.1, the variation from concentricity measured between insi
24、de and outside diameters shall not exceed2.0mm. 5.4 Permissible deviations on cut lengths of hoses When measured in accordance with BS5173-101.2, the permissible deviations on cut lengths of hoses shall be as given in Table 2. Table 2 Permissible deviations on cut lengths 1) 1bar=10 5 N/m 2 =100kPa.
25、 Nominal bore Permissible deviations mm 12.5 16 19 25 31.5 38 44.5 51 mm 0.75 Nominal length of hose Permissible deviations mm Up to and including300 Over300 up to and including600 Over600 up to and including900 Over900 up to and including1200 Over1200 up to and including1800 Over1800 3mm 4.5mm 6mm
26、9mm 12mm 1% of nominal length BS5122:1986 2 BSI 09-1999 6 Physical properties of the cover 6.1 Resistance to liquids (class B hoses only) When tested in accordance with the volumetric method described in BS903-A16, using oil No.3 and immersing for 70h at100 1 C, the cover shall have a volume change
27、not greater than100%. 6.2 Resistance to ozone When tested in accordance with the method described in BS5173-106.3 using an elongation of20% at40 2 C for1681h, no cracking shall be visible under 2 magnification. 7 Performance requirements 7.1 Adhesion When tested in accordance with the method describ
28、ed in BS5173-103.1, the adhesion between lining and reinforcement, between layers of reinforcement and between cover and reinforcement shall be not less than2.0N/mm. 7.2 Hydrostatic pressure requirements 7.2.1 When tested in accordance with the methods described in BS5173-102.1, the hoses shall comp
29、ly with the appropriate requirements given in Table 3 and shall show no cracks or leaks at proof pressure. Table 3 Hydrostatic pressure requirements 7.2.2 All manufactured lengths of hose shall be tested at proof pressure. 7.3 Steam resistance When tested in accordance with the method described in A
30、ppendix A, the hose shall comply with the requirements given in Table 4, the lining shall not be cracked or popcorned (an eruption evident on the surface of a hose lining after exposure to pressurized steam) and the cover shall not be cracked or blistered. NOTEAny leakage at the coupling may be igno
31、red. Table 4 Steam resistance requirements 8 Marking Each manufactured length of hose shall be continuously 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 and date of this British Standa
32、rd, i.e.BS5122:1986 2) , with the class letter and type number as suffixes; c) the nominal bore; d) the month and year of manufacture; e) the design working pressure. This information shall be stated in the following form: MR/BS5122:1986 A1/19mm/7-86/2bar. Property Type1 Type2 Design working pressur
33、e Proof pressure Change in diameter at proof pressure Change in length at proof pressure Maximum twist at proof pressure Minimum burst pressure 2bar 10bar +15%,5% 12% 30 /m 20bar 5bar 25bar +15%,5% 12% 30 /m 50bar +2 0 Property Minimum requirements Mean burst pressure Hardness of lining after steami
34、ng Mean elongation at break of lining after steaming 50% of mean value for hoses not exposed to steam Not to vary by more than10 IRHD from the value for non-steamed test piece Not less than50% of mean non-steamed value with a minimum value of150% 2) Marking BS5122:1986 on or in relation to a product
35、 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 responsibility. Enquiries as to the availability of third party certification should be addressed to the appropriate certific
36、ation body.BS5122:1986 BSI 09-1999 3 Appendix A Test for resistance to steam A.1 Test pieces Cut four lengths of hose each with fittings to give minimum lengths of1m between the end fittings. A.2 Procedure A.2.1 Select any two test pieces and subject them for168 2h to flowing saturated steam using m
37、ethod A described in BS5173-103.8, at a pressure of3.5 0.5bar for type1 hose and7.0 0.5 bar for type2 hose. Allow the test pieces to cool and then, at room temperature, bend them four times through180 for nominal bore sizes up to and including31.5mm and through90 for larger bore sizes, over a mandre
38、l of appropriate radius given in Table 5, rotating the test piece through90 between each bending. After bending, mark these test pieces “steamed hose”. Table 5 Mandrel sizes A.2.2 Mark two test pieces through which steam has not flowed “non-steamed hose”. A.2.3 Determine the burst pressure of all fo
39、ur test pieces as described in BS5173-102.1. A.2.4 Cut open the four test pieces and determine the hardness by the micro-test method described in BS903-A26 and the elongation at break of the lining rubber as described in BS903-A2 using the type2 dumb-bell. Record the hardness and elongation at break
40、 of the lining for the four test pieces. 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
41、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 hose” and “steamedhose” lining. Nominal bore Mandrel radius mm 12.5 16 19 25 31.5 38 44 51 mm 80 100 135 170 240 290 340 3754 blankBS5122:1986 BSI
42、09-1999 Publications referred to BS903, Methods of testing vulcanized rubber. BS903-A2, Determination of tensile stress-strain properties. BS903-A16, The resistance of vulcanized rubber to liquids. BS903-A26, Determination of hardness. BS3558, Glossary of rubber terms. BS5173, Methods of test for ru
43、bber and plastics hoses and hose assemblies. BS5173-101.1, Measurement of dimensions (excluding length). BS5173-101.2, Measurement of length of hoses and hose assemblies. BS5173-102.1, Hydrostatic tests. BS5173-103.1, Determination of adhesion between components. BS5173-103.8, Determination of resis
44、tance to steam. BS5173-106.3, Determination of ozone resistance. BS5342, Specification for rubber hoses for high-pressure saturated steam 3) . ISO6134, Rubber hoses for steam Specification 3) . 3) Referred to in the foreword only.BS5122:1986 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandar
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