2023年全國(guó)碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、BRITISHSTARDBSENISO158755:2003Plasticspipingsystemsfhotcoldwaterinstallations—Crosslinkedpolyethylene(PEX)—Part5:FitnessfpurposeofthesystemTheEuropeanStardENISO158755:2003hasthestatusofaBritishStardICS23.040.0191.140.60?

2、?????????????????????????????????????????????????????????????????????LicensedCopy:InstituteOfTechnologyTallaghtInstituteofTechnologyTueDec1909:54:13GMT00:002006UncontrolledCopy(c)BSIBSENISO158755:2003?BSI14June2004ib)Ina

3、dditiontotheabove:1)ThenmalmaximumoperatingcoldwatersupplypressureintheUKis12.5bar4)whichsomecategiesofpipingsystemsintheBSENISO15875seriesofstardsdonotmeet.2)TheBSENISO15875seriesofstardsdoesnotspecificallydescribepushf

4、itjointswhicharethepredominantjointingmethodintheUK.3)ThereisadisparitybetweenthemalfunctiontemperaturequotedinBSENISO158751Table1(100C)themalfunctiontemperaturesapplicabletoboilers(110C)confmingtoBSEN297:19945)BSEN483:2

5、0006)BSEN625:19967).Consequentlypipingsystemscouldbesubjectedtotemperaturesinservicefwhichtheyhavenotbeentested.4)TheuniquetraditionalpracticeintheUKistouseproductscertifiedtoBS72912BS72913ClassSfallapplicationsasdefined

6、inBS72911.ThisisrecognizedinthenationalannextoBSEN128288)whichrecommendstheuseofsystemssuitablefthemaximumtemperaturespressuresftheirintendedapplicationspecifiedinBS72911.UpdatedversionsofBS72911BS72912BS72913arebeingpre

7、paredwhichmaintainthesetraditionalUKoperatingconditionsmeasuresarebeingtakentoaddressthisissueinappropriateharmonizedEuropeanStards.CrossreferencesTheBritishStardswhichimplementinternationalEuropeanpublicationsreferredto

8、inthisdocumentmaybefoundintheBSICatalogueunderthesectionentitled“InternationalStardsCrespondenceIndex”byusingthe“Search”facilityoftheBSIElectronicCatalogueofBritishStardsOnline.Thispublicationdoesnotpurpttoincludeallthen

9、ecessaryprovisionsofacontract.UsersareresponsiblefitscrectpliancewithaBritishStarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcoveraninsidefrontcoverpagesiiitheENISOtitlepag

10、epages2to10aninsidebackcoverabackcover.TheBSIcopyrightnoticedisplayedinthisdocumentindicateswhenthedocumentwaslastissued.4)1bar=100kPa.5)BSEN297:1994Gasfiredcentralheatingboilers—TypeB11B11BSboilersfittedwithatmosphericb

11、urnersofnominalheatinputnotexceeding70kW.6)BSEN483:2000Gasfiredcentralheatingboilers—TypeCboilersofnominalheatinputnotexceeding70kW.7)BSEN625:1996Gasfiredcentralheatingboilers—Specificrequirementsfthedomestichotwateroper

12、ationofcombinationboilersofnominalheatinputnotexceeding70kW.8)BSEN12828Heatingsystemsinbuildings—Designfwaterbasedheatingsystems.LicensedCopy:InstituteOfTechnologyTallaghtInstituteofTechnologyTueDec1909:54:13GMT00:002006

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