Bsi bs en 00377 1993 (1999)

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 1

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

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 0 580 21251 3

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 Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y

France Association française de normalisation Germany Deutsches Institut für Normung e.V

Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland

Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portuguès da Qualidade Spain Asociación Española de Normalización y Certificación Sweden Standardiseringskommissionen i Sverige

Switzerland Association suisse de normalisation United Kingdom British Standards Institution

Amendments issued since publication

1996 Indicated by a sideline in the margin

BS EN 377:1993

Contents

Page

National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back cover

ii © BSI 12-1999

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 2 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

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 377

May 1993

+ A1

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 à l’exception des appareils

spécifiquement destinés à un usage industriel

(inclut l’amendement A1:1996)

Schmierstoffe für die Anwendung in Geräten und zugehörigen Stell-Geräten für Brenngase außer 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

© BSI 12-1999 2

Foreword

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

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 1 is issued after evaluation of one

year of test experience

Contents

Page

3 Classification of the lubricants 3

Annex A (informative) Production of the

Figure 1 — Overall view of the assembly 5

Figure 7 — U shape tubes with ground stopcocks 8 Figure 8 — Fixing of spring steel guard 8

Table A.1 — Compositions of SRE-NBR 1

Table A.2 — Instructions for making the

Table A.3 — Laboratory rolling machine 10 Table A.4 — Requirements and testing 10

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

1 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

2 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

ISO 6743-9:1987, Lubricants, industrial oils and related products (class L) — Classification — Part 9: Family X (Greases)

3 Classification of the lubricants

The manufacturer shall declare the temperature class of the lubricant as given in Table 1

4 Requirements

4.1 Behaviour at low temperature

The flow pressure of the lubricant, determined

according to 5.1, shall not exceed 1 500 mbar.

4.2 Behaviour at high temperature

The loss in mass of the lubricant, tested according

to 5.2, shall not exceed 8 % of the initial value

Table 1 — Temperature classes

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 2 or less for all classes in accordance with clause 5 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

5 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 0 °C, that is to say, the pressure required for complete expulsion of the lubricant contained in a nozzle

Range of operating temperature(°C) From to 0

60

0 90

0 120

0 140

0 160

4 © BSI 12-1999

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 ± 1 °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 1 500 mbar — having

readability u 5 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 ± 1 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 1 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 1 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 1 mg and placed for (24 ) h in a normal oven

at temperatures as shown in Table 2

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 3

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

0 –0,5

EN 377:1993

Figure 1 — Overall view of the assembly

6 © BSI 12-1999

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

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 7 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)

Figure 2 — Casing

Figure 3 — Nozzle

Figure 4 — Nozzle holder

Figure 5 — Control gauge