00953704 PDF BRITISH STANDARD BS EN 377 1993 Incorporating Amendment No 1 Lubricants for applications in appliances and associated controls using combustible gases except those designed for use in ind[.]
BRITISH STANDARD BS EN 377:1993 Incorporating Amendment No Lubricants for applications in appliances and associated controls using combustible gases except those designed for use in industrial processes The European Standard EN 377:1993, with the incorporation of its amendment A1:1996, has the status of a British Standard BS EN 377:1993 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom This British Standard, having been prepared under the direction of the Gas Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 August 1993 © BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference GSE/22 Draft for comment 90/78081 DC ISBN 580 21251 Oesterreichisches Normungsinstitut Institut belge de normalisation Dansk Standardiseringsraad Suomen Standardisoimisliito, r.y Association franỗaise de normalisation Deutsches Institut für Normung e.V Hellenic Organization for Standardization Technological Institute of Iceland National Standards Authority of Ireland Ente Nazionale Italiano di Unificazione Inspection du Travail et des Mines Nederlands Normalisatie-instituut Norges Standardiseringsforbund Instituto Portugs da Qualidade Asociación Espola de Normalización y Certificación Standardiseringskommissionen i Sverige Association suisse de normalisation British Standards Institution Amendments issued since publication Amd No Date Comments 9328 December 1996 Indicated by a sideline in the margin BS EN 377:1993 Contents Cooperating organizations National foreword Foreword Text of EN 377 National annex NA (informative) Committees responsible National annex NB (informative) Cross-references © BSI 12-1999 Page Inside front cover ii Inside back cover Inside back cover i BS EN 377:1993 National foreword This British Standard has been prepared under the direction of the Gas Standards Policy Committee and is the English language version of EN 377:1993 Lubricants for applications in appliances and associated controls using combustible gases except those designed for use in industrial processes, including amendment 1, published by the European Committee for Standardization (CEN) EN 377 was produced as a result of international discussions in which the United Kingdom took an active part 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 document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages to 10, 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 the amendment table on the inside front cover ii © BSI 12-1999 EUROPEAN STANDARD EN 377 NORME EUROPÉENNE May 1993 + A1 EUROPÄISCHE NORM March 1996 UDC 621.892:641.534:644.62:683.97:622.95:697.245:620.1 Descriptors: Household appliances, gas appliances, lubricants, classifications, specifications, physicochemical properties, tests English version Lubricants for applications in appliances and associated controls using combustible gases except those designed for use in industrial processes (includes amendment A1:1006) Lubrifiants destinés aux appareils et équipement associés utilisant les combustibles gazeux l’exception des appareils spécifiquement destinés un usage industriel (inclut l’amendement A1:1996) Schmierstoffe für die Anwendung in Geräten und zugehưrigen Stell-Geräten für Brenngase aer denjenigen die für die Anwendung in industriellen Prozessen vorgesehen sind (enthält Änderung A1:1996) This European Standard was approved by CEN on 1993-04-25 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 alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central 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 official versions CEN members are the national standard bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © CEN 1993 Copyright reserved to CEN members Ref No EN 377:1993 + A1:1996 E EN 377:1993 Foreword Contents This European Standard has been prepared by Technical Committee CEN/TC 108 “Sealing materials and lubricants for gas appliances and gas equipment” This European Standard has been prepared under a mandate given to CEN by the Commission of the European Communities and the European Free Trade Association, and supports essential requirements of EC Directive(s) This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 1993, and conflicting national standards shall be withdrawn at the latest by November 1993 In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom Page Foreword Introduction Scope Normative references 3 Classification of the lubricants Requirements Methods of test Annex A (informative) Production of the standard reference elastomer Figure — Overall view of the assembly Figure — Casing Figure — Nozzle Figure — Nozzle holder Figure — Control gauge Figure — Weighing glass Figure — U shape tubes with ground stopcocks Figure — Fixing of spring steel guard Table — Temperature classes Table Table Table Table A.1 — Compositions of SRE-NBR (in part of mass) Table A.2 — Instructions for making the mixture Table A.3 — Laboratory rolling machine 10 Table A.4 — Requirements and testing 10 Foreword to Amendment A1 This Amendment EN 377:1993/A1:1996 to EN 377:1993 has been prepared by Technical Committee CEN/TC 108, Sealing materials and lubricants for gas appliances and gas equipment, the secretariat of which is held by NNI This Amendment to the European Standard EN 377:1993 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 1997, and conflicting national standards shall be withdrawn at the latest by January 1997 According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Amendment: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom Lubricants for applications in appliances and associated controls using combustible gases except those designed for use in industrial processes Amendment No is issued after evaluation of one year of test experience © BSI 12-1999 EN 377:1993 Introduction This standard specifies the essential physical and chemical characteristics of lubricants to be used in gas and associated controls appliances using combustible gases except those designed for use in industrial processes Judgement on the suitability of the use of these lubricants for any given equipment is not the object of the present standard This has to be verified by functional tests laid down in the appropriate appliance or control standards Notwithstanding the limits of operating temperature covered by this standard, it may be necessary to check any specific operating temperature by functional testing and compatibility trials The lubricants covered by this standard are compatible with copper and copper alloys Compatibility with other metals — e.g aluminium and aluminium alloys (which might be corroded by alkaline soaps) — has to be confirmed by long term functional tests at the maximum working temperature This standard contains an informative Annex A on the preparation of a standard reference elastomer used for testing the compatibility with elastomers Scope This standard specifies requirements and methods of test for lubricants to be used in gas appliances of all categories including auxiliary equipment mounted or intended to be mounted on such appliances and which may be in contact with combustible gases, except those designed for use in industrial processes Normative references This European Standard incorporates by dated or undated reference, provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard For undated references the latest edition of the publication referred to applies ISO 1817:1985, Rubber, vulcanized — Determination of the effect of liquids ISO 2160:1985, Petroleum products — Corrosiveness to copper — Copper strip test ISO 3219:1977, Plastics — Polymers in the liquid, emulsified or dispersed state — Determination of viscosity with a rotational viscometer working at defined shear rate © BSI 12-1999 ISO 6743-9:1987, Lubricants, industrial oils and related products (class L) — Classification — Part 9: Family X (Greases) Classification of the lubricants The manufacturer shall declare the temperature class of the lubricant as given in Table Requirements 4.1 Behaviour at low temperature The flow pressure of the lubricant, determined according to 5.1, shall not exceed 500 mbar 4.2 Behaviour at high temperature The loss in mass of the lubricant, tested according to 5.2, shall not exceed % of the initial value Table — Temperature classes Range of operating temperature (°C) From to Class 60 90 0 120 140 160 A B C D E In addition, the apparent dynamic viscosity of the lubricant shall not be increased by more than 100 % or decreased by more than 50 % compared with the initial value 4.3 Resistance to gas The increase in mass of the lubricant in gaseous butane, tested according to 5.3, shall not exceed 10 % of the initial value 4.4 Compatibility with copper The appearance of copper test strips tested in accordance with 5.4 shall give a classification or less for all classes in accordance with clause of ISO 2160:1985 when compared with the reference strips 4.5 Compatibility with elastomers The increase in volume of the standard reference nitrile elastomer, tested in lubricant according to 5.5, shall not exceed 10 % of the initial value The maximum change in hardness is 10 IRHD Methods of test 5.1 Behaviour at low temperature 5.1.1 Principle The method consists of determining the relative flow pressure of the lubricant at °C, that is to say, the pressure required for complete expulsion of the lubricant contained in a nozzle EN 377:1993 5.1.2 Apparatus (Figure 1) The apparatus comprises a tube in the shape of a cross made from glass or metal, with a nozzle and its holder at the end of the lower tube section and a stopper with a hole for the thermometer at the top end of the upper tube section complete with holder One of the lateral tube sections is connected to an air supply under pressure, the other to a pressure gauge These different components are described below — Nozzle The nozzle (Figure 3) is a steel cylinder having a collar and with an orifice in the form of a truncated cone It is mounted in a nozzle holder (Figure 4) which, in turn, screws onto a brass casing (Figure 2) retained with a suitable glue — Thermometer The thermometer measures the test temperature with an accuracy of ± °C It is inserted into the vertical section of the test apparatus where it is held in position by a rubber stopper through which it passes and which fits into the enlarged section of the tube thus locating the thermometer in the centre of the triangular orifice at the entry to the nozzle in conjunction with the casing — Control gauge This accessory (Figure 5) is used to position the lower part of the thermometer in the casing — Pressure gauge up to 500 mbar — having readability u mbar — Test tube with a diameter of around 25 mm and a height of 130 mm to accept the lower part of the equipment with the nozzle It is closed by a perforated and split rubber stopper — Liquid bath with cover, containing a liquid, the temperature of which can be controlled to (0 ± 1) °C The bath cover shall have an opening through which the lower part of the test apparatus (N.B Inserted into the test tube) can be immersed into the temperature controlled liquid to a depth of at least 65 mm — Chronometer, tolerance ± s — Cotton lint or absorbent paper — Glass plate — Source of compressed air 5.1.3 Method of operation Clean the base of the apparatus and the nozzle carefully with cotton lint or absorbent paper without using solvents The thermometer is mounted as shown in Figure and adjusted by means of the control gauge which is inserted into the apparatus through the nozzle for a length of 21 mm The lower step of the gauge is positioned level with the exit of the nozzle The lower end of the thermometer shall touch the upper end of the gauge Remove the nozzle Fill the nozzle by spreading lubricant on the glass plate as a bubble free layer and placing the nozzle on this bed of lubricant with the large opening underneath, pressing until it contacts the glass plate.The nozzle should then be separated from the glass plate by lateral movement and the operation repeated until lubricant is emitted from the smaller opening Excess lubricant is removed with a spatula Assemble the apparatus with the nozzle arranged as in Figure and insert the lower part into the test tube Connect one of the laterals to the pressure source and the other to the pressure gauge Condition the apparatus at a temperature of (0 ± 1) °C for (2,5 ± 0,5) h in the liquid bath Raise the pressure by stages of 25 mbar every 30 s The flow pressure is defined as being the highest level of pressure reached, corresponding to the complete expulsion of the lubricant from the nozzle 5.2 Behaviour at high temperatures Three weighing devices consisting of two ground glass discs of 60 mm diameter (Figure 6) are cleaned with acetone and weighed (1 ± 0,05) g of the lubricant is equally distributed on both parts of the devices by circling movements Then both discs are separated by lateral movement to give a smooth lubrication film The lubricant samples are weighed to mg and placed for (24 ) –0,5 h in a normal oven at temperatures as shown in Table The change in mass with reference to the initial mass of the samples is determined after the devices have cooled down to ambient temperature in a desiccator containing calcium chloride Use the arithmetic mean value of the three results obtained The change of the viscosity is determined on lubricant samples which were stored in the same manner at temperatures shown in Table The test method is that of cone and plate described in ISO 3219 with the following parameters: — Temperature (23 ± 0,2) °C; — Shear rate 250 s–1 © BSI 12-1999 EN 377:1993 Figure — Overall view of the assembly © BSI 12-1999 EN 377:1993 Figure — Nozzle holder Figure — Casing Figure — Control gauge The values are read off after a rotation period of 30 s and compared with the initial value Use the arithmetic mean value of the three results obtained 5.3 Resistance to gas Figure — Nozzle The mass increase of the lubricant in gaseous butane (W 99,5 % n-butane by mass) is determined in a U-tube with ground stopcocks, see Figure Each side of the U-tube contains an aluminium strip 110 m × 10 mm × 0,5 mm The stopcocks are greased with the lubricant to be tested in such a way that no lubricant comes out from the ground glass The stopcocks should be protected against over pressure inside the U-tube by means of a guard or a steel spring (e.g Figure 8) © BSI 12-1999 EN 377:1993 Figure — Weighing glass Table Temperature (°C) Class A B C D E 90 ± 120 ± 150 ± 170 ± 190 ± Table Class A B C D E © BSI 12-1999 Temperature (°C) 60 ± 90 ± 120 ± 140 ± 160 ± The mass (m1) of the U-tube prepared in this way is determined to mg Afterwards the U-tube is flushed free of air in a thermostatically controlled water bath at (20 ± 1) °C for 10 with butane (about 150 ml/min) Thereafter the outlet stopcock is closed and the pressure is adjusted to the absolute test pressure of (1 065 ± 5) mbar After temperature equalization (about min) the inlet stopcock is closed and the mass (m2) of the carefully dried U-tube is determined The U-tube is opened and flushed with air A total mass of (2,0 ± 0,1) g of lubricant is equally spread on both sides of the aluminium strips leaving 10 mm at the end free of lubricant for handling by forceps The exact amount of lubricant is the difference between the mass of the U-tube with the coated aluminium strips (m3) and the mass m1 After flushing the U-tube free of air in the prescribed manner let butane under an absolute pressure of (1 065 ± 5) mbar at (20 ± 1) °C act on the lubricant sample for h and determine thereafter the mass of the U-tube (m4) under test pressure analogous to m2 Such h loading tests with subsequent weighing are repeated until the mass (m4) differs by not more than mg from the previous measured value Note that care should be taken that the gas lines are first flushed free of air and adjusted to the prescribed test pressure, before opening the inlet stopcock of the U-tube again The absorption (B) by the lubricant of butane is calculated as mass % from the maximum value of mass m4 according to the following equation: ( m – m2 ) – ( m3 – m1 ) B = ´ 100 ( m3 – m ) 5.4 Compatibility with copper The test is carried out in accordance with ISO 2160 using the method described for lubricants (8.1.6) with the special condition, shown in Table The ) h test period is (24 –0,5 5.5 Compatibility with elastomers The compatibility of lubricants with standard reference elastomer according to Annex A is tested in accordance with ISO 1817 — volumetric method (8.2) and hardness test (11.2) — and the following special conditions Three test pieces of 50 mm × 20 mm × mm were weighed and immersed into at least 50 ml of lubricant for (168 –20 ) h at a temperature of (100 ± 1) °C Determine the increase in volume and the change in hardness EN 377:1993 Figure — U shape tubes with ground stopcocks Table Class A B C D E Test temperature (°C) 60 ± 90 ± 120 ± 140 ± 160 ± Figure — Fixing of spring steel guard © BSI 12-1999 EN 377:1993 Annex A (informative) Production of the standard reference elastomer A.1 Composition The standard reference elastomer (SRE) for testing the compatibility with lubricants consists of a butadien acrylonitrile rubber (NBR) which is cross-linked by peroxide Table A.1 shows its composition The parts of the composition are mixed together at a roller surface temperature of (50 ± 5) °C preferably using the information of Table A.2 Table A.1 — Composition of SRE-NBR (in parts of mass) This information refers to a laboratory rolling machine with the properties shown in Table A.3 and a standard mixture of 400 g rubber NOTE Sheets of standard reference elastomer with the designation SRE-NBR are available from Bundesanstalt für Materialforschung und prüfung (BAM), unter den Eichen 87, D-1000 Berlin 45 The produced mixture is stored for at least h and not more than 24 h at the temperature of 23 °C From the stored mixture a plate which nearly fits the hole of the mould is cut, on a clean dry base (preferably a metal plate) A.2 Vulcanizing Before the filling of the form [size: length ë 150 mm, width ë 150 mm, height ë (2,0 ± 0,2) mm], the form is preheated for at least 20 at a temperature of (170 ± 2) °C in a NBR with (28 ± 0,5) weight % press with a locking pressure of at acrylonitrile 100,0 least 35 bar (3,5 MN/m2) N-(1,3 Dimethyl-butyl)-N-phenyl-pA suitably cut piece of the mixture (100,5 to 101 % phenylene diamine 0,5 of the expected mass of the plate) is inserted in the Zinc oxide, precipitated 5,0 mould as fast as possible to avoid cooling down It is Carbon black FEF ASTM-N 550 70,0 vulcanized for (20 ± 1) at the temperature Dicumyl peroxide 40 % 3,0 of (170 ± 2) °C under the full locking pressure of the total 178,5 press Afterwards the plate is removed immediately from the mould and cooled down in cold water for 10 to 15 Table A.2 — Instructions for making the mixture Operation Point of time Roll width mm Feeding of rubber 1,4 ± 1,5 Mixing with zinc oxide at uniform distribution mixing with ageing inhibitor 1,4 ± 0,5 Cutting in # of the roll width (3 times right, times left) 1,4 ± 0,5 Mixing with the half mass of carbon black over the whole width Stepwise expansion for keeping the torus dimensions Cutting in #of the roll width (3 times right, times left) 12 Mixing with the residual carbon black 14 Mixing with peroxide 19 Cutting in # of the roll width (6 times right, times left) 21 The removed mixture is wound up and passed through in longitudinal direction for times at small slit width 25 Removing of the mixture with the width of 2,1 to 2,2 mm 29 © BSI 12-1999 Stepwise expansion for keeping the torus dimensions 2,0 EN 377:1993 Table A.3 — Laboratory rolling machine size — Outside diameter of roller — Width of working space, adjustable between boundary jaws Number of revolutions Front, slow roller Friction Ratio of numbers of revolutions of the fast and the slow roller (150 ± 5) mm 250 to 280 mm (24 ± 1) min–1 A.3 Properties of test plates Thickness of the plate (2,0 ± 0,2) mm The requirements for the properties of the material are shown in Table A.4 The pieces for testing the properties of the material are cut from the test plate in a distance of at least 15 mm from the edge of the test plate A.4 Storage of testing plates The testing plates have to be stored according to ISO 2230 Under these conditions they could be used up to one year after their production 1,4 : Table A.4 — Requirements and testing Property Unit Tensile strength MPa Elongation at break % Hardness IRHD Density g/cm3 Compression set % Requirements Test 21 to 25 According to ISO 37, dumb-bell test pieces, type 180 to 220 According to ISO 37, dumb-bell test pieces, type 78 to 83 1,22 to 1,26 10 to 16 According to ISO 48, test pieces, micro test According to ISO 2781, test pieces According to ISO 815, standard test pieces, small type, times laminated, small type, times laminated, (24 Resistance to ageing — — Storage (24 0) –2 –2 at (100 ± 1) °C h at (100 ± 1) °C in a normal oven Change of tensile strength % – 15 to + 15 According to ISO 37, dumb-bell test pieces, type Change of elongation at break % rel – 15 to + 15 According to ISO 37, dumb-bell test pieces, type Increase in mass in fuel B according to ISO 1817 % 10 24 to 27 According to ISO 1817, test pieces (50 mm × 20 mm × mm), storage during (24 –20 ) h at (23 ± 2) °C ratio of volume: test piece/testing material 1/(80 ± 5) © BSI 12-1999 BS EN 377:1993 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Gas Standards Policy Committee (GSE/-) to Technical Committee GSE/22 upon which the following bodies were represented: Association of Control Manufacturers [TACMA (BEAMA Ltd.)] British Combustion Equipment Manufacturers’ Association British Gas plc Chief and Assistant Chief Fire Officers’ Association Department of Trade and Industry (Consumer Safety Unit, CA Division) Health and Safety Executive LP Gas Association Society of British Gas Industries National annex NB (informative) Cross-references Publication referred to Corresponding British Standard ISO 2160:1985 BS 2000 Methods of test for petroleum and its products Part 154:1982 Detection of copper corrosion from petroleum products by the copper strip tarnish test BS 2782 Methods of testing plastics Part Rheological properties Method 730B:1978 Determination of the viscosity of polymers in the liquid, emulsified or dispersed state using a rotational viscometer working at a defined shear rate BS 6413 Lubricants, industrial oils and related products (class L) Part 9:1988 Classification for family X (greases) BS 903 Physical testing of rubber Part A16:1987 Determination of the effect of liquids ISO 3219:1977 ISO 6743-9:1987 ISO 1817:1985 © BSI 12-1999 BS EN 377:1993 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: 020 8996 9000 Fax: 020 8996 7400 BSI offers members an 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