1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 10619-2:2011Rubber and plastics hoses andtubing Measurement offlexibility and stiffnessPart 2: Bending tests at sub-ambienttemperatures (ISO 10619-2:2011)BS EN ISO 1061
2、9-2:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO10619-2:2011. It supersedes BS EN ISO 4672:1999 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/66/-/4, Rubber and plastics tubing, hoses and hoseassemb
3、lies - Methods of test.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012ISBN
4、 978 0 580 65421 3ICS 23.040.70Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2012.Amendments issued since publicationDate T e x t a f f e c t e dEUROP
5、EAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 10619-2 December 2011 ICS 23.040.70 Supersedes EN ISO 4672:1999English Version Rubber and plastics hoses and tubing - Measurement of flexibility and stiffness - Part 2: Bending tests at sub-ambient temperatures (ISO 10619-2:2011) Tuyaux et tubes en
6、 caoutchouc et en plastique - Mesurage de la flexibilit et de la rigidit - Partie 2: Essais de courbure des tempratures infrieures lambiante (ISO 10619-2:2011) Gummi- und Kunststoffschluche mit und ohne Einlage - Bestimmung der Biegsamkeit und Steifigkeit - Teil 2: Biegeprfungen bei Temperaturen unt
7、erhalb der Umgebungstemperatur (ISO 10619-2:2011) This European Standard was approved by CEN on 30 November 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any a
8、lteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language
9、made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Es
10、tonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION E
11、UROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 10619-2:2011: EBS EN ISO 10619-2:2011EN ISO 10619-2:2011 (E) 3 Foreword This document (EN I
12、SO 10619-2:2011) has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products” in collaboration with Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies” the secretariat of which is held by BSI. This European Standard shall be given the status of a nationa
13、l standard, either by publication of an identical text or by endorsement, at the latest by June 2012, and conflicting national standards shall be withdrawn at the latest by June 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights
14、. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 4672:1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standar
15、d: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Ki
16、ngdom. Endorsement notice The text of ISO 10619-2:2011 has been approved by CEN as a EN ISO 10619-2:2011 without any modification. BS EN ISO 10619-2:2011ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wo
17、rk of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governm
18、ental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The ma
19、in task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Att
20、ention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 10619-2 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 1,
21、 Hoses (rubber and plastics).This first edition cancels and replaces ISO 4672:1997, which has been technically revised.ISO 10619 consists of the following parts, under the general title Rubber and plastics hoses and tubing Measurement of flexibility and stiffness: Part 1: Bending tests at ambient te
22、mperature Part 2: Bending tests at sub-ambient temperatures Part 3: Bending tests at high and low temperaturesISO 10619-2:2011(E) ISO 2011 All rights reserved iiiBS EN ISO 10619-2:2011BS EN ISO 10619-2:2011INTERNATIONAL STANDARD ISO 10619-2:2011(E)Rubber and plastics hoses and tubing Measurement of
23、flexibility and stiffness Part 2:Bending tests at sub-ambient temperaturesWARNING Persons using this part of ISO 10619 should be familiar with normal laboratory practice. This part of ISO 10619 does not purport to address all of the safety problems, if any, associated with its use. It is the respons
24、ibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.1 ScopeThis part of ISO 10619 specifies two methods for measuring the stiffness and one method for the determination of the flexibility of rubber and plastics hos
25、es and tubing when they are bent to a specific radius at sub-ambient temperatures.Method A is suitable for non-collapsible rubber and plastics hoses and tubing with a bore of up to and including 25 mm. This method provides a means of measuring the stiffness of the hose or tubing when the temperature
26、 is reduced from a standard laboratory temperature.Method B is suitable for rubber and plastics hoses and tubing with a bore of up to 100 mm and provides a means of assessing the flexibility of the hose or tubing when bent around a mandrel at a specified sub-ambient temperature. It can also be used
27、as a routine quality control test.Method C is suitable for rubber and plastics hoses and tubing with a bore of 100 mm and greater. This method provides a means of measuring the stiffness of the hose and tubing at sub-ambient temperatures. This method is only suitable for hoses and tubing which are n
28、on-collapsible.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1402, Rub
29、ber and plastics hoses and hose assemblies Hydrostatic testingISO 8330, Rubber and plastics hoses and hose assemblies VocabularyISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods3 Terms and definitionsFor the purposes of this document, the terms
30、 and definitions given in ISO 8330 and the following apply.3.1bendingshaping or forcing something straight into a curve or angle at a specified temperature ISO 2011 All rights reserved 1BS EN ISO 10619-2:20113.2flexibilityease of bending a hose without it being damaged by kinking, collapse, breaking
31、 or crackingNOTE A hose can be bent around a mandrel, for example.3.3stiffnessresistance of a hose to bending4 Method AThis method applies to non-collapsible hoses with a bore of up to and including 25 mm only.4.1 Apparatus4.1.1 Torque wheel, having a diameter equal to twice the minimum bend radius
32、specified for the hose, provided with equipment for holding the hose tangential to the wheel, a suitable device to bend the hose around the wheel, and a strain gauge and graphical recorder to measure the torque with an accuracy of 3 % (see Figure 1). If the minimum bend radius is not specified, the
33、torque wheel shall have a diameter equal to 12 times the nominal bore of the hose (see Figure 1).4.1.2 Cooling container, equipped with an agitator, a temperature-measuring device and a roller having a diameter of 50 mm for guiding the hose (see Figure 1). The coolant shall not affect the hose under
34、 test and shall be used as prescribed in ISO 23529. A suitable coolant liquid is methanol or ethanol with crushed dry ice (solid carbon dioxide) added. Gaseous coolants may be employed when the design of the apparatus is such that the tests using such coolants give results equivalent to those obtain
35、ed with liquid coolants.4.2 Hose test piece4.2.1 TypeThe hose test pieces shall be cut from the hose under test and shall have a length equal to:2 piR d+( ) (1)whereR is the minimum bend radius as specified in the relevant hose product standard;d is the hose bore.4.2.2 Number of hose test piecesAt l
36、east three hose test pieces shall be used for each test.No test shall be carried out less than 24 h after manufacture of the hose.4.3 Test temperatureThe test shall be conducted at one of the following temperatures:0 C 2 C10 C 2 C25 C 2 CISO 10619-2:2011(E)2 ISO 2011 All rights reservedBS EN ISO 106
37、19-2:201140 C 2 C55 C 2 Cor any other sub-ambient temperature as defined in the relevant product standard.4.4 ProcedureClamp one end of the hose test piece (4.2) on the wheel (4.1.1), with the rest of the test piece straight. If the hose has natural curvature, this curvature shall follow that of the
38、 wheel.Without coolant in the container (4.1.2), determine the torque required to bend the test specimen through 180 round the wheel at the standard temperature chosen from those given in ISO 25329. The time for bending shall be (12 2) s. Repeat the test with the container filled with coolant at the
39、 chosen test temperature (see 4.3). Condition the hose test piece in a cold chamber at the test temperature for 24 h followed by conditioning at the test temperature in the apparatus for at least 30 min before testing.4.5 Expression of resultsFor each hose test piece, calculate the mean torque at th
40、e standard temperature and the mean torque at the test temperature by calculating the mean of the peak values contained in the central 50 % of the respective torque traces.Calculate the stiffness, S, expressed as the ratio of the mean torque at the test temperature to that at the standard temperatur
41、e, from Equation (2):STT=ot(2)whereTtis the torque at the test temperature (mean value from three tests);Tois the torque at the standard temperature (mean value from the three tests).If the individual values for the three test specimens do not agree to within 15 % of the mean value at each temperatu
42、re, the test shall be repeated.4.6 Test reportThe test report shall include the following:a) reference to this part of ISO 10619, i.e. ISO 10619-2:2011;b) a full description of the hose and its origin;c) the dimensions of the hose test pieces;d) the coolant used;e) the standard temperature and the t
43、est temperature;f) the torque at the standard temperature, To, and at the test temperature, Tt;g) the calculated value of the stiffness, S;h) the date of the test.5 Method BThis method applies to hoses and tubing with a bore size of up to 100 mm only.ISO 10619-2:2011(E) ISO 2011 All rights reserved
44、3BS EN ISO 10619-2:20115.1 Apparatus5.1.1 Mandrel, having an outside diameter equal to twice the minimum bend radius specified for the hose, or a former, with an arc of at least 180. If the minimum bend radius is not specified, the mandrel or former shall have an outside diameter equal to 12 times t
45、he bore of the hose.5.1.2 Conditioning chamber, capable of being maintained at the specified temperature (see 5.3).5.1.3 For hoses with a bore greater than 22 mm that need to be flexed outside the conditioning chamber an example of a test rig that may be used is shown in Figure 2. A pneumatic ram pu
46、shes the mandrel so as to contact the hose sample and bend it around the mandrel.5.2 Hose test piecesThe hose test piece shall be cut from the hose under test and shall have a length at least greater than 10 % of the circumference of the mandrel used. The sample should be long enough to allow the sa
47、mple to be gripped at each end in addition to the section which will be bent around the periphery of the mandrel.The test specimen shall be discarded on completion of the test.5.3 Test temperatureThe test shall be conducted at one of the following temperatures:0 C 2 C10 C 2 C25 C 2 C40 C 2 C55 C 2 C
48、or any other sub-ambient temperature as defined in the relevant product standard.5.4 ProcedureCondition the mandrel (5.1.1) and the hose test piece (5.2) in the conditioning chamber (5.1.2) at the chosen test temperature (see 5.3) for 24 h. Without removing them from the conditioning chamber, bend a
49、round the mandrel, hoses up to and including 22 mm bore through 180 in less than 10 s and hoses greater than 22 mm bore through 180 in less than 12 s.For hoses of greater than 22 mm bore, testing outside the conditioning chamber is permitted, using apparatus shown in Figure 2 (if the sample cannot be bent by hand). The sample should be bent around the mandrel in less than 12 s after removal from the cold box.Observe whether any cracking or breaking of the hose cover occurs during th
