1、 STD-BSI BS EN 10275-ENGL 1777 Lb24bb7 0778030 533 W BRITISH STANDARD Metallic materials - Tillbe ring hydraulic pressure test The European Standard EN 10275 1999 has the status of a British Standard ICs 77.040.10 BS EN L0275:1999 U- NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT
2、 LAW STD-BSI BS EN 30275-ENGL 3777 Lb24bb7 0778033 47T direction of the Engineering Amd.No. Date Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 September 1999 BS EN 10276:1999 Comments National foreword This British Standard is the English
3、language version of EN 102751999. The TJK participation in its prepdon was entrusted by Technical Committee ISE/NFE/4, Mechanical testing of metals, to Subcommittee ISE/NFE/4/2, Ductility tests, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible Eur
4、opean committee any enquiries on the interpretation, or proposals for change, and keep he UK interests informed - monitor related international and European developments and promulgate them in the UK A list of organizations represenkd on this subcommittee can be obtained on request to its secretary.
5、 Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Elec
6、tronic Catalogue. 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 confer immunity from legal obligations. Summary of pages This d
7、ocument comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright notice displayed throughout this document indicates when the document was last issued O BSI 09-1999 I I ISBN O 680 32637 3 I l EUROPEANSTANDARD NORME EUROPENNE EUROP- NOW EN 10
8、275 May 1999 ICs 77.040.10 English version Metallic matrials- hbe ring hydraulic pressure test Matriaux mtaiiques - Ecsai dexpansion hydraulique sur annm tubulaire Metallische Werkstoffe - Hydraulisch er Ringaufweitvemch This European Standard was approved by CEN on 16 April 1999. CEN members are bo
9、und to comply with the CENKENELEC Internal Regulations which stipuate the conditions for giving this European Standard the status of a nationai standard without any atemtion. Upto-date lists and bibliographid references concerning such national standards may be obtained on application to the Central
10、 Secretariat or to any CEN member. This European Standard exists 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 Central Secretariat has the same status as the
11、 official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United hgdom. European Committee for Standardization Co
12、mit Europen de Normabation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1999 CEN AU rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 102751999 E Page 2 EN 10275:1999 Foreword This European Standa
13、rd has been prepared by khnicai Committee ECISSAY 29, Steel tubes and fittings for steel tubes, the Secretariat of which is held by UNI. This European Standard shall be given the status of a nalional standard, either by publication of an identical txt or by endorsement, at the latest by November 199
14、9, and conflicting national stanhds shdi be withdrawn at the latest by November 1999. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free We Associaion. This European Standard is considered to be a supporting standard to those applic
15、ation and product standards which in themselves support an esseniid safety requirement of a New Approach Directive and which make reference to this European Standard. According to the CENKENELEC Intenial Regulations, the nationai standards organizations of the following countries are bound to implem
16、ent this European Stan- Austria, Belgium, Czech Republic, Denmark, Finiand, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Foreword 1 Scope 2 Symbols 3 Principle 4 APPW 5 Testring 6 Test procedu
17、re 7 Hoop strength evaluation 8 Test report Annex A (informative) Proof and reduced section testing pa% 2 3 3 3 3 3 5 6 6 7 O BSI 09-1999 1 scope This hopean Standard specifies the ring hydraulic pressure test for metallic tubes. It is generally applied to tubes with an outside diameter generally gr
18、eater than 120 mm and outside diameter to thickness ratio not less than 20. The objective of this test is to ascertain the value of the hoop stress required to produce a specified total circumferential (hoop) strain. 2 Symbols Symbols and corresponding designations are given in ?LIble 1. Table 1 - S
19、ymbols and designations SpbOl T D L P X Rtx Unit Designation Measured tube test ring thickness Measured outside diameter of the tube test ring Length of tube test ring Hydrostatic pressure to produce the specified total strain Specified total strain Hoop strength at the specified total strain 3 Prin
20、ciple The test involves the unrestrained expansion of the test ring between two platens, under internal hydraulic pressure; the outer circumference of the tube is the effective test piece gauge length. The test is carried out on a test piece (see Figure 1) removed from a welded or seamless tube of t
21、hickness up to a limit dependent upon the capacity of the machine and the strength of the tube. Where the hydraulic pressure required to produce the specified circumferential strain exceeds the capacity of the test machine modified hts may be carried out as described in annex A The test is specified
22、 when a measure of the hoop strength is required which is not influenced by cold forming and residual stress introduced when flattening a standard tensile test piece. The standard tensile test is nec-, however, when tensile strength and elongation measurements are required Page 3 EN 10275:1999 4 App
23、aratus 4.1 The testing machine shall be capable of allowing the test ring to expand freely without imposing any end restraint. This shall be achieved by leaving a small gap between the test piece and the top platen. Fressure loss during testing shall be prevented by the use of a flexible seal. NOTE
24、A typical testing machine is shown schematically in Figure 2. 4.2 To reduce fiction between the test piece, platens and inner die to a minimum, the platens shall be parallel and have a fine turned or ground finish. Prior to each test, friction at the contact surfmes shall be further minimized either
25、 by the use of a lubricant e.g. graphited grease or by the use of PTFE oiytetsafiuorethylene) sheet. The platens shall be inspected regularly and any ridges that develop shall be removed. 4.3 Stress shall be applied to the test ring by means of a pressurized fluid. Frovision shall be made to remove
26、any air in the system through a bleed line. 5 %st ring 6.1 Shape and position 6.1.1 Prior to separation from the main body of the tube the test ring shaU be marked with a unique identifcation. 6.1.2 The test ring may be prepared from an oversize flame cut sample. Final preparation shail be by a cold
27、 machining process to ensure removal of any heat affected zones. The machined edges sha have a fme turned or ground finish and be free from burrs. 6.1.3 The dimensions and tolerances for the test piece are given in Figure 1. The machined edges shall be parallel and normal to the axis of the tube to
28、within 0,15 mm measured across the diameter. 6.2 Determination of dimensions 6.2.1 The outside diameter of the test ring shall be calculated from measurement of the tube circumference, e.g. using a flexible steel tape. The maximum tolerance on the accuracy of this measurement shall be fl mm. 6.2.2 T
29、he wall thickness shall be determined by calculating the mean of eight measurements taken at approximately 45“ internais around the test piece, excluding the weld region of welded tubes (see Figure 3). The measuring device shall be capable of measuring thickness with an accuracy of better than 0,025
30、 mm. 6.2.3 AU tube diameter and thickness measurements of the test ring shall be fully documented. O BSI 09-1999 STDmBSI BS EN 20275-ENGL 1999 = Lb29bb7 0778035 015 Page 4 EN 10275:1999 a Both faceito b machined parallel with fine turned or ground finish from normal 0,15 mm Tolerance on L a,25 mm. L
31、 is commonly taken as 76 mm. NOTE Remove all sharp edges and protect machined surfaces. Figure 1 - Test ring dimensions and tolerances -Top piaten / Rubber seal or gasket Pressurizing fluid Boitam - piaten Figure 2 - Schematic diagram of testing machine (with insalled test ring) O BSI 09-1999 STD-BS
32、I BS EN L0275-ENGL 1999 m 1b24bbl 077803b T5L m Page 5 EN 102761999 6 lkst procedure 6.1 The test procedure consists of applying pressure and measuring circumferential extension. 6.2 Circumferential extension of the test ring shali be measured during pressurization as follows. The equipment for meas
33、uring the change of circumference, e.g. steel tape or roller chain extensometer shall be wrapped around the test ring perimeter at the mid-point and crossing at the weld NOTE in Figure 4. When a steel tape is used friction shd be minimized by coating both the tape and test ring circumference with a
34、suitable lubricant. Change in circumference shall be measured by a suitable mechanical or electrical device having an accuracy of Q,25 mm. An example of the use of a steel tape is shown 6.3 The equipment for measuring the increase in circumference shall be wrapped around the test ring before applica
35、tion of the internai pressure. 6.4 The tolerance for the measurement of internai pressure shail be within fl % Accuracy of the pressure measurement device shail be verified, e.g. by comparison with dead weight test equipment, at the commencement of a sequence of testing and then once every 200 tests
36、, and not less than once per year during the testuig period. 6.6 The rate of strain shall not exceed 0,2 % per minute. 6.6 The pressure and circumferential extension output signais shall be recorded, for example on a X-Y plotter, and related to the test piece identi 8 (Adjacent to the weld) I 4 Figu
37、re 3 - Wall thickness measurement positions O BSI 09-1999 STD-BSI BS EN 10275-ENGL 1999 = Lb2Vbb9 0798037 998 M Page 6 EN 102751999 Test ring NOTE The separation between the two parallel portions of the measuring device shall be between 1,5 mm and 3,O mm. Figure 4 - Measuring device position for ext
38、ension measurement 7 Hoop strength evaluation 7.1 A typical test pressmwircumferential extension record is shown in Figure 5. 8 Test report The test report shall contain at least the following infomation: 7.2 The pressure p corresponding to the specified total strain shall be detennined from the tes
39、t record I 7.3 the specified totai strain shall be calculated from the formula: For tubes where D/T 2 20 the hoop strength at PD ; L1 NOTE 1 For tubes with DIT c 20 the hoop strength calculated from this formula becomes increasingly inaccurate and quantitative results should be used with caution. Fa
40、ctors such as strain hardening could have a significant effect on the validity of the calculated sbength. NOTE 2 The specified total strain is calculated from the circumferential extension divided by the original test ring circumference. a) reference to this European Standard i.e. EN 10275; b) ident
41、ification of test ring, e.g. cast No.hbe No. /identification No.; c) material specification, if known; d) diameter and wall thickness of the tube; e) length of the tube test ring; f) calculated hoop strength at specified total strain, g) reference to an alternative test method used, when appropriate
42、 (see annex A). O BSI 09-1999 STD-BSI BS EN 10275-ENGL 1799 m lb24bb7 0798038 82Li m Page 7 EN 102751999 Pressure at /specilied extension f l I I I I I I l I I I I I I I I I Specified total extension L * c Circumferential extension Figure 5 - Wpical pressure/extension test record Annex A (informativ
43、e) Proof and reduced section testing A.l Proof testing This method may be used where the stress necessary to produce the specied circumferentiai extension has not been achieved but where the stress in the test ring exceeds the specified minimum hoop strength requirement. In this case the percentage
44、circumferential expansion achieved shall be quoted in the report. A.2 Reduced section testing This method enables the stress corresponding to the specified circumferential extension to be achieved by a reduction in the test ring thickness. This reduction can be effected by machining the inside andlo
45、r outside diameter. TO ensure that the full thichess is represented two or possibly three tests should be carried out after machining i) inside, ii) outside and iii) both diameters. Details of all test piece locations and dimensions relative to the fuli thickness ring section will be included in the
46、 report. O BSI 09-1999 STD=BSI BS EN 3U275-ENGL 3799 = Lb2LibbS 0778039 7b0 BS EN 10275: 1999 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe
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