BS_148-2020.pdf

BRITISH STANDARDBS148:2020ContentsPageForeword1Scope2 Normative references23Terms and definitions34Identification and delivery35Sampling6 Properties,their significance and test methodsTable 1-General specifications4Annex A(informative)Recycled oil properties,their significance and test methods6BibliographySummary of pagesThis document comprises a front cover,and inside front cover,pages i to ii,pages 1 to 8,an inside back cover and aback cover.THE BRITISH STANDARDS INSTITUTION 2020-ALL RIGHTS RESERVED IBS148:2020BRITISH STANDARDForewordPublishing informationThis British Standard is published by BSI Standards Limited,under licence from The BritishStandards Institution,and came into effect on 31 March 2020.It was prepared by TechnicalCommittee GEL/10,Fluids for electrotechnical applications.A list of organizations represented on thiscommittee can be obtained on request to its secretarySupersessionThis British Standard supersedes BS 148:2009,which is withdrawn.Information about this documentThe limits given in this British Standard are based on BS EN 60296.For ease of cross-reference,the clause numbering of this standard follows that of BS EN 60296 as far as possible.This standarddiffers from BS EN 60296 in specifying limits for total furans.The increasing use of total furfural/furans measurements as an in-service diagnostic tool has brought about the necessity to imposelimits on reclaimed oil,which is continued in this edition.This British Standard acknowledges UKpractice whereby the limiting values for reclaimed mineral insulating oils are based on those forunused mineral insulating oils for transformers and switchgear while having due regard for thevariability of used oil feedstock from which reclaimed oil is produced.Use of this documentIt has been assumed in the preparation of this British Standard that the execution of its provisionswill be entrusted to appropriately qualified and experienced people,for whose use it hasbeen produced.Presentational conventionsThe provisions of this standard are presented in roman(i.e.upright)type.Its requirements areexpressed in sentences in which the principal auxiliary verb is shall.Commentary,explanation and general informative material is presented in smaller italic type,and doesnot constitute a normative element.Requirements in this standard are drafted in accordance with Rules for the structure and drafting ofUK standards,subclause G.1.1,which states,Requirements should be expressed using wording suchas:When tested as described in Annex A,the product shall.This means that only those productsthat are capable of passing the specified test will be deemed to conform to this standard.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of a contract.Users areresponsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.II THE BRITISH STANDARDS INSTITUTION 2020-ALL RIGHTS RESERVEDBS148:2020BRITISH STANDARDBS EN 62697-1,Test methods for quantitative determination of corrosive sulphur compounds in unusedand used insulating liquids-Test method for quantitative determination of dibenzyldisulfide(DBDS)BS EN IEC 62961,Insulating liquids Test methods for the determination of interfacial tension ofinsulating liquids-Determination with the ring methodBS EN ISO 2719,Determination of flash point-Pensky-Martens closed cup methodBS EN ISO 3104,Petroleum products.Determination ofkinematic viscosity and calculation of dynamicviscosity of transparent and opaque liquidsBS EN ISO 3675,Methods of test for petroleum and its products-BS 2000-160:Crude petroleum andliquid petroleum products.Laboratory determination ofdensity-Hydrometer methodBS EN IS0 12185,Methods of test for petroleum and its products-Crude petroleum and petroleumproducts.Determination of density.Oscillating U-tube methodDIN 51353,Testing ofinsulating oils;detection of corrosive sulfur;silver strip test(Foreign Standard)ISO 2049,Petroleum products.Determination of colour(ASTM scale)3Terms and definitionsFor the purposes of this British Standard,the following terms and definitions apply.3.1 mineral insulating oilinsulating liquid obtained by refining,modifying and blending of petroleum products3.2 uninhibited oilmineral insulating oil to which no anti-oxidants or metal deactivating agents have been added butwhich might contain other additives3.3 inhibited oilmineral insulating oil containing an anti-oxidant3.4 passivated oilmineral insulating oil containing a metal deactivating agent3.5 unused oilmineral insulating oil,obtained by refining,modifying and/or blending of petroleum products andother hydrocarbons.NOTE Such an oil has not been used in,nor been in contact with electrical equipment or other equipment notrequired for manufacture,storage or transport.3.6 recycled oilmineral insulating oil previously used in electrical equipment that has been subjected to an off-siterecycling processNOTE A blend of unused and recycled oils in any proportion is regarded as being recycled oil.3.7 reclaimed(regenerated)oilrecycled oil which has been subjected to chemical and physical processing to reduce soluble andinsoluble contaminants2 THE BRITISH STANDARDS INSTITUTION 2020-ALL RIGHTS RESERVED