BS EN ISO 12127-2-2008 Clothing for protection against heat and flame - Determination of contact heat transmission through protective clothing or constituent materials - Test methoc.pdf

1、BRITISH STANDARDBS EN ISO 12127-2:2007Clothing for protection against heat and flame Determination of contact heat transmission through protective clothing or constituent materials Part 2: Test method using contact heat produced by dropping small cylindersICS 13.340.10g49g50g3g38g50g51g60g44g49g42g3

2、g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 12127-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30

3、May 2008 BSI 2008ISBN 978 0 580 58993 5National forewordThis British Standard is the UK implementation of EN ISO 12127-2:2007.The UK participation in its preparation was entrusted by Technical Committee PH/3, Protective clothing, to Subcommittee PH/3/2, Clothing for protection against heat and flame

4、.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from

5、 legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 12127-2December 2007ICS 13.340.10English VersionClothing for protection against heat and flame - Determination ofcontact heat transmission through protective clothing o

6、rconstituent materials - Part 2: Test method using contact heatproduced by dropping small cylinders (ISO 12127-2:2007)Vtements de protection contre la chaleur et la flamme -Dtermination de la transmission thermique par contact travers les vtements de protection ou leurs matriauxconstitutifs - Partie

7、 2: Mthode dessai utilisant latransmission thermique par contact produite par des petitscylindres compte-gouttes (ISO 12127-2:2007)Schutzkleidung gegen Hitze und Flammen - Bestimmungdes Kontaktwrmedurchgangs durch Schutzkleidung oder -materialien - Teil 2: Durch fallende Zylinder erzeugteKontaktwrme

8、 (ISO 12127-2:2007)This European Standard was approved by CEN on 21 September 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and

9、bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibilit

10、y of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Irel

11、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36

12、B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 12127-2:2007: EForeword This document (EN ISO 12127-2:2007) has been prepared by Technical Committee ISO/TC 94 “Personal safety - Protective clothing and equipm

13、ent“ in collaboration with Technical Committee CEN/TC 162 “Protective clothing including hand and arm protection and lifejackets“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endors

14、ement, at the latest by June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. 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

15、any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s). For relationship with EC Directive(s), see informative Annex ZA, which is an integra

16、l part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,

17、Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 12127-2:2007 has been approved by CEN as a EN ISO 12127-2:2007 without any modifica

18、tion. BS EN ISO 12127-2:2008iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body intere

19、sted 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-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical

20、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 main task of technical committees is to prepare International Standards. Draft International Standards adopted by the tec

21、hnical 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. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO

22、 shall not be held responsible for identifying any or all such patent rights. ISO 12127-2 was prepared by Technical Committee ISO/TC 94, Personal safety Protective clothing and equipment, Subcommittee SC 13, Protective clothing. ISO 12127 consists of the following parts, under the general title Clot

23、hing for protection against heat and flame Determination of contact heat transmission through protective clothing or constituent materials: Part 1: Test method using contact heat produced by heating cylinder Part 2: Test method using contact heat produced by dropping small cylinders BS EN ISO 12127-

24、2:2008iv Introduction Protective clothing designed to protect the welders is exposed to high-temperature particles generated from the welding point into the welding environment. These hot particles are small splashes of molten metal, sparks and slag. When the small splashes of molten metal are scatt

25、ered, they produce heat into the atmosphere, become oxidized and start to change from a molten state into a solidified state. The diversity of the conditions in which splashes of molten metal and other hot particles may come into contact with materials used for welders protective clothing makes it d

26、ifficult to evaluate the hazards that may arise under conditions of use. The most important protective function is resistance to heat transfer through the layers of clothing from high-temperature metal drops, sparks and solidified hot particles trapped on the fabric in folds or in seamed areas. The

27、test method described in this part of ISO 12127 allows this heat transfer to be assessed when a hot steel cylinder simulating a small hot particle is allowed to fall on the material. Furthermore, this method can be used to assess charring and hole formation in the material. This part of ISO 12127 fo

28、rms a part of a series of standards concerned with clothing designed to protect against heat and fire. This part of ISO 12127 is especially used to assess the consequences for protection of the impact of small hot metal particles on clothing materials. ISO 12127-1 is a revision of ISO 12127:1996. BS

29、 EN ISO 12127-2:20081Clothing for protection against heat and flame Determination of contact heat transmission through protective clothing or constituent materials Part 2: Test method using contact heat produced by dropping small cylinders 1 Scope This part of ISO 12127 specifies a test method desig

30、ned to evaluate the heat transfer and the behaviour of materials used for protective clothing when such materials are struck by high temperature metal particles, especially when these are trapped in the folds of the garment in working saituations. The results obtained by this method permit the compa

31、rison of the behaviour of different materials which have undergone this test under standardized conditions. They do not permit conclusions to be drawn with respect to contacts with large splashes of molten cast iron or other metal, nor do they allow the behaviour of complete garments under industria

32、l conditions to be predicted. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 maximum temperature Tmaxmaximum temperature of the calorimeter after contact of the cylinder with the sample 2.2 starting temperature T0temperature of the calorimet

33、er at the starting point of the temperature measurement 2.3 start of the temperature measurement start the temperature measurement at the exact time when the solenoid is switched on 2.4 temperature difference T change in temperature between the maximum temperature reached and the temperature of the

34、calorimeter at the start of temperature measurement (T = Tmax T0) 2.5 cone temperature Tctemperature of the cone when removed from the oven BS EN ISO 12127-2:20082 2.6 hole scorched break in the test specimen caused by charring or melting of the material NOTE The break is assessed as a hole if threa

35、ds or construction of the material have been clearly diminished or deteriorated, when viewed with the aid of a magnifying glass, in which case a comparison is made of the new and test samples. 3 Principle This test method consists of two phases, which are carried out in order. In the first phase of

36、this method, a hot steel cylinder is allowed to fall on a point on a horizontally oriented test specimen, which is then checked for the formation of a hole. The hole formation is assessed immediately after the sample is gently unfastened from the counterweights, if used. No mechanical stress shall b

37、e deliberately applied to the sample before examination. In the second phase, the maximum temperature difference is measured for the materials that passed the first phase. Changes in appearance of the specimen are recorded. Figure 1 shows the overview of the dropping device. For details and measurem

38、ents, ask for technical engineering pictures1). Key 1 steel cone 7 support block for specimen 2 cone holder 8 framework 3 solenoid with rod 9 aluminium block (connect to cooling unit) 4 insulation brick 10 cooling unit 5 drop guide 11 counterweight 6 test specimen Figure 1 Overview of the dropping d

39、evice 1) Technical engineering pictures are available from Finnish Institute of Occupational Health, Protection and Product Safety, Topeliuksenkatu 41 A, FIN-00320 Helsinki, Finland, Fax +358-30 474 2115. BS EN ISO 12127-2:200834 Apparatus and materials 4.1 Heating oven, capable of reaching a temper

40、ature of at least 800 C and with inside measurements adequate for heating the steel cone, e.g. (110 140 160) mm. 4.2 Steel cylinder, comprising a normal commercial cylindrical roller for roller bearings, with the following dimensions2): Material: Steel 58-65 HRC Diameter: 6,0 mm 11 m Height: 12 mm 1

41、1 m Mass: 2,6 g 20 mg A new steel cylinder is used for every single drop. The flat circular end of the cylinder shall be in contact with the specimen. 4.3 Steel cone (Figure 2), in which the steel cylinders are heated and from which they are transferred to the test specimen. The cone is machined fro

42、m heat resistant steel. A thin slot is machined through the cone for a sliding plate, which releases the cylinder to the specimen. 4.4 Cone holder (Figure 3), made from heat resistant steel and which locates the cone in position for releasing the steel cylinder. Figure 2 Steel cone Figure 3 Cone hol

43、der 4.5 Support table (Figure 1), which supports the cone on the metal holder, solenoid and cooling unit. The support table is made of heat resistant and thermo negative material. 4.6 Solenoid with a rod, used to push the sliding plate inside the cone to release the cylinder (Figure 1). The solenoid

44、 is located to one side of the support table so that the rod is able to push the sliding plate and release the cylinder from the cone. 2) Torrington product ZRO. 6 12* PO/M6* is an example of a suitable product available commercially (). This information is given for the convenience of users of this

45、 document and does not constitute an endorsement by ISO of this product. BS EN ISO 12127-2:20084 4.7 Drop guide (Figure 4), designed to guide the steel cylinder to the horizontally oriented test specimen. Drop guide part 1 (ceramic pipe covered with aluminium pipe) is fixed to the support table. Dro

46、p guide part 2 is separate and machined from the aluminium pipe. It is surrounded by glued neoprene cover and has inside ceramic pipe with a tapered throat. Part 2 is lowered on the sample. Figure 4 Parts of drop guide and assembly 4.8 Support block for the specimen and calorimeter (Figure 5), made

47、of a curved aluminium sheet and fitted on a plastic base element. Two blocks are needed: one without calorimeter: plain curved aluminium sheet; one with the temperature calorimeter: glass-fibre strips are glued on both sides of the calorimeter on the top of the curved aluminium sheet, as shown in Fi

48、gure 5. The blocks can be moved forward and backward under the drop guide (see Figure 1). 4.9 Calorimeter for measuring the temperature under the test specimen, comprising a K-type thermocouple (Figure 6) inserted into the copper disc. The dimensions of the copper disc are: purity 99,9 %; thickness

49、1,7 mm 0,02 mm; diameter 8 mm 0,02 mm; mass 766 mg 13 mg. BS EN ISO 12127-2:20085The calorimeter manufactured in accordance with Figure 6 is mounted to a ceramic ferrule. This assembly is mounted tightly with a thin layer of heat resistant glue3)to the hole in the curved aluminium sheet of the support block. (Figure 5). Figure 5 Support block for the specimen and calorimeter Figure 6 Calorimeter, mounting the thermocouple to the copper disc 4.10 Thermo electric cooler (Figure 7), attached to