1、March 2012 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 2
2、3.040.70!$zC:“1873223www.din.deDDIN EN 26801Rubber or plastics hoses Determination of volumetric expansion (ISO 6801:1983 + Amd 1:2011)(includes Amendment A1:2011)English translation of DIN EN 26801:2012-03Gummi- oder Kunststoffschluche Bestimmung der Volumenzunahme (ISO 6801:1983 + Amd 1:2011) Engl
3、ische bersetzung von DIN EN 26801:2012-03Tuyaux en caoutchouc ou en plastique Dtermination de lexpansion volumique (ISO 6801:1983 + Amd 1:2011) Traduction anglaise de DIN EN 26801:2012-03SupersedesDIN EN 26801:1993-04www.beuth.deIn case of doubt, the German-language original shall be considered auth
4、oritative.Document comprises 10 pages02.12(enthlt nderung A1:2011)(Amendement A1:2011 inclus)DIN EN 26801:2012-03 2 A comma is used as the decimal marker. National foreword This document has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products”, Subcommittee SC 1 “Hoses (rubber
5、 and plastics) (both secretariats are held by DSM, Malaysia), in collaboration with Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Kautschuktechnik (Rub
6、ber Technology Standards Committee), Working Committee NA 045-02-12 AA Schluche. Amendment A1:2011 was approved by CEN on 31 August 2011. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. For safety reasons, alcohol is no longer permitted as pressur
7、izing fluid in the hydrostatic pressure test. Distilled water is now to be used instead. Amendments This standard differs from DIN EN 26801:1993-04 as follows: a) alcohol as pressurizing fluid in the hydrostatic pressure test has been deleted; b) in Clause 2, the footnote reference number at the end
8、 of the title of ISO 1402 and the associated footnote have been deleted. Previous editions DIN EN 26801: 1993-04 September 2011 ICS 23.040.70 English Version Rubber or plastics hoses Determination of volumetric expansion (ISO 6801:1983 + Amd 1:2011) Tuyaux en caoutchouc ou en plastique Dtermination
9、de lexpansion volumique (ISO 6801:1983 + Amd 1:2011) Gummi- oder Kunststoffschluche Bestimmung der Volumenzunahme (ISO 6801:1983 + Amd 1:2011) EN 26801:1993 was approved by CEN on 1992-12-04 and Amendment A1:2011 on 2011-08-31. CEN members are bound to comply with the CEN/CENELEC Internal Regulation
10、s which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. The European S
11、tandards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national sta
12、ndards bodies of 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, an
13、d United Kingdom. All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 26801:1993 + A1:2011 E EN 26801:1993 + A1 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM 2011 CEN EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATIO
14、N EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels DIN EN 26801:2012-03 EN 26801:1993 + A1 (E)Contents Page Foreword to EN 26801:1993 . 2 Foreword to EN 26801:1993/A1:2011 2 0 Introduction 4 1 Scope and field application . 5 2 Reference 5 3 Apparatus 5 4 Calibratio
15、n of apparatus 5 5 Procedure 5 6 Expression of results . 6 7 Test report . 7 Foreword to EN 26801:1993/A1:2011 This document (EN ISO 26801:1993/A1:2011) has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products” in collaboration with Technical Committee CEN/TC 218 “Rubber and pl
16、astics hoses and hose assemblies” the secretariat of which is held by BSI This Amendment to the European Standard EN 26801:1993 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2012, and conflicting national standa
17、rds shall be withdrawn at the latest by March 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Inter
18、nal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxemb
19、ourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 6801:1983/Amd 1:2011 has been approved by CEN as a EN ISO 26801:1993/A1:2011 without any modification. Foreword to EN 26801:1993 This
20、 European Standard is the endorsement of ISO 6801. Endorsement of International Standard ISO 6801:1983 Rubber or plastics hoses Determination of volu-metric expansion was recommended by CEN/TC 218 “Rubber and plastics hoses and hose assemblies”, the Secretariat of which is held by BSI, under whose c
21、ompetence this European Standard will henceforth fall. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by July 1993 at the latest. In accordance with the CEN/CENELEC I
22、nternal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Nether-lands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of
23、the International Standard ISO 6801:1983 was approved by CEN as a European Standard without any modification. DIN EN 26801:2012-03 EN 26801:1993 + A1 (E) 30 Introduction When used for dispensing specific volumes of fluids, the volumetric capacity of a hose is often required to vary by only small amo
24、unts at the dispensing pressure. This International Standard describes a method of checking that such requirements can be met. DIN EN 26801:2012-03 EN 26801:1993 + A1 (E)1 Scope and field application This International Standard specifies a method for the determination of the volumetric expansion of
25、rubber or plastics hoses under hydrostatic pressure. This International Standard does not specify the dimensions of the test piece and the test pressure(s) as each of which will be specified in the appropriate specification. 2 Reference ISO 1402, Rubber and plastics hoses and hose assemblies Hydrost
26、atic testing. 3 Apparatus (see the figure) 3.1 The Apparatus comprises a suitable source of fluid which can be maintained at the required pressure, together with pressure gauges, piping, valves and fittings, so that a vertical length of hose can be subjected to hydraulic pressure. A graduated burett
27、e of sufficient accuracy is also required for measuring the volume of fluid corresponding to the expansion of the hose under pressure. 3.2 The bore of all piping and connections shall be smooth without recesses or off-sets, so that all air may be freely removed from the system before carrying out ea
28、ch test. The valves shall be of such design as to open and close with minimum displacement of fluid. The apparatus shall be capable of increasing the pressure in the test piece in accordance with ISO 1402. The rate of pressure increase shall be a) between 0,075 and 0,175 MPa/s for test pressures up
29、to 12,5 MPa; b) between 0,35 and 1,0 MPa/s for higher test pressures. 4 Calibration of apparatus 4.1 Prior to testing the hose, the correction factor(s) for the apparatus, to allow for its increased capacity under the test pressure(s), shall be determined as described in 4.2. 4.2 Following the proce
30、dure as described in clause 5, using a length of steel hydraulic tubing with external diameter 6,3 mm and minimum wall thickness 1,52 mm in place of the test pieces, determine the correction factor as the mean value of three expansions. 4.3 If the correction factor, determined at a pressure of 10,3
31、MPa, exceeds 0,08 cm3, the apparatus is unsuitable. 5 Procedure 5.1 Carefully connect the test piece in position on the apparatus in such a way as to obtain a leak-proof seal, taking care to avoid twisting it. Maintain the test piece in a vertical position without being in tension while under pressu
32、re. The free length of the test piece should be measured. DIN EN 26801:2012-03 EN 26801:1993 + A1 (E) 55.2 ! Fill the tank with distilled water, taking care that it is free of air or dissolved gases. “ Open valve A and fill the pressure source with liquid. Partially open valve D and allow the liquid
33、 to run from the tank through the burette until no air bubbles are seen in the burette. NOTE Removal of air bubbles may be facilitated by moving the test piece back and forth. 5.3 Close valves A, C and D and raise the pressure in the test piece to the test pressure for not more than 10 s. Check for
34、leaks at the connections and release the pressure completely in the test piece by opening valve C, which shall then be closed before proceeding as described in 5.4. 5.4 Adjust the liquid level in the burette to the zero mark by means of valve D. 5.5 Increase the pressure at the rate specified in 3.2
35、 until the pressure gauge shows the test pressure. Maintain this pressure in the test piece by closing valve B. Then determine the expansion immediately by opening valve C and allowing the liquid in the expanded test piece to rise in the burette. As soon as the liquid level has become constant, dose
36、 valve C and record the volume in the burette. 5.6 Repeat the procedure as described in 5.5 twice, so that the final reading on the burette is the total volume of the three expansions. 5.7 If the pressure in the test piece is inadvertently raised, just prior to reading the expansion, to a value abov
37、e the test pressure but not exceeding 50 % of the specified minimum burst pressure for the hose, release the pressure completely, allow the test piece to recover for 15 nnin and repeat the procedure described in 5.4 to 5.6. If the pressure in the test piece is allowed to exceed 50 % of the specified
38、 minimum burst pressure for the hose, discard the test piece and repeat the test using another test piece. If, at any time during the test, an air bubble flows out of the test piece, repeat the test after allowing the test piece to recover for at least 5 min. 6 Expression of results The volumetric e
39、xpansion, E, expressed in cubic centimetres per metre of free length of the test piece, is given by the equation lCVE 3/where V is the total volume of the three expansions, in cubic centimetres, read from the burette, rounded to the nearest 0,01 cm3; C is the correction factor, in cubic centimetres,
40、 rounded to the nearest 0,01 cm3(see clause 4) ; l is the free length of the test piece in metres. Report the result in cubic centimetres per metre, rounded to the nearest 0,01 cm3. NOTE The result may be expressed as a percentage, if required, by determining the internal diameter and the free lengt
41、h of the hose assembly, and hence its volume, prior to testing. DIN EN 26801:2012-03 EN 26801:1993 + A1 (E)7 Test report The test report shall include the following information: a) a reference to this International Standard; b) a full description of the hose and its origin; c) the dimensions of the
42、test piece; d) the test pressure; e) the correction factor for the apparatus; f) the total volume of the three expansions; g) the calculated hose expansion, in cubic centimetres per metre; h) the percentage volumetric expansion, if required. DIN EN 26801:2012-03 EN 26801:1993 + A1 (E) 7Figure 1 Schematic arrangement of test apparatus DIN EN 26801:2012-03 EN 26801:1993 + A1 (E)
