high temp dye machine

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Health and Safety Executive

High temperature textile dyeing machinesGuidanceNotePM4

This is a free-to-download, web-friendly version of PM4 (Second edition, published 1997). This version has been adapted for online use from HSE’s current printed version.

You can buy the document at www.hsebooks.co.uk and most good bookshops.

ISBN 978 0 7176 1410 3 Price £5.50

Each year there are accidents and dangerous occurrences causing serious and sometimes fatal injuries to operators of high temperature dyeing machines, as well as damage to plant.

This guidance is aimed at suppliers, operators and those concerned with maintenance and thorough examination of high temperature dyeing machines. It draws attention to various hazards and describes ways in which those hazards can be reduced or eliminated.

HSE Books

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© Crown copyright 1997

Firstpublished1976Secondedition1997

ISBN9780717614103

Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans(electronic,mechanical,photocopying,recordingorotherwise)withoutthepriorwrittenpermissionofthecopyrightowner.

Applicationsforreproductionshouldbemadeinwritingto:TheOfficeofPublicSectorInformation,InformationPolicyTeam,Kew,Richmond,SurreyTW94DUore-mail:[email protected]

ThisguidanceisissuedbytheHealthandSafetyExecutive.Followingtheguidanceisnotcompulsoryandyouarefreetotakeotheraction.Butifyoudofollowtheguidanceyouwillnormallybedoingenoughtocomplywiththelaw.Healthandsafetyinspectorsseektosecurecompliancewiththelawandmayrefertothisguidanceasillustratinggoodpractice.


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ContentsIntroduction 4

Dangers 4

Designsafeguards 4

Operations 9

Maintenance 10

Thoroughexamination 11

Useofhydrogenperoxide(H202) 12

References 14

Furtherinformation 15


Hightemperaturetextiledyeingmachines Page4of15


Introduction1 Eachyearthereareaccidentsanddangerousoccurrencescausingseriousandsometimesfatalinjuriestooperatorsofhightemperaturedyeingmachines,aswellasdamagetoplant.

2 Forthepurposesofthisguidancenoteahightemperaturedyeingmachineisonethatoperatesattemperaturesabove100°Candpressuresaboveatmospheric.

3 Dyevesselscontainingsteamorhotwaterabove0.5bargpressure(ieover110°C)willbesubjecttothePressureSystemsandTransportableGasContainersRegulations1989(PSR).1-5TheRegulationsaredesignedtoreducetheriskofseriousinjurycausedbytheunintentionalreleaseofstoredenergywithinapressurevesselandtoreducetheriskofscaldingfromsteam.

4 ThisguidancenoteisissuedbytheHealthandSafetyExecutive(HSE)andaimedatsuppliers,operators,andthoseconcernedwithmaintenanceandthoroughexaminationofhightemperaturedyeingmachines.Itdrawsattentiontovarioushazardsanddescribeswaysinwhichthosehazardscanbereducedoreliminated.

Dangers5 Themajorityofaccidentsatdyeingmachinesarecausedbyexplosionsorscalding.Forexample:

(a) Pressurevesselsorcomponentssuchasopeningcovershavefailedwhile underpressure,duetomechanicalfailureorfaultyclosing.(b) Vesselshavefailedduringbleachingoperationsusinghydrogenperoxide(H2O2). DecompositionofH2O2hasledtotherapidevolutionofoxygenwhichhasbeen beyondthecapacityofthereliefdevices,causingthevesseltofailcatastrophically.(c) Operatorsmaybeengulfedwithsteam,boilingliquid,orhotwater,when: (i) thetemperatureofdyeingliquorisaboveorabout100°Candalidor samplechamberisopened,allowingliquortoflashviolentlyintosteamand eruptfromthevessel; (ii) doorsareopenedandhotliquorallowedtospillout,egfromhorizontal vesselsnotcompletelydrainedorverticalvesselsfilledabovecover-flange level; (iii) oneofabankofmachinesisinadvertentlypressurisedfromanadjacent machine,viaacommonblow-downordrainline.

Design safeguardsIntegrity of the vessel

6 Designers,manufacturers,importersandsuppliersofhightemperaturedyeingmachineshaveadutyunderthePSRtopreventdangerbyensuringthateverypressurevesselisproperlydesignedandconstructedtoprovideanadequatemarginofsafetyforthedutyithastoperform.TheuseofappropriatestandardssuchasBritishStandardBS5500:1994Specification for unfired fusion welded pressure vessels6isrecommended.Thevesselshould:



(a) beproperlyconstructedfromsuitablematerial;(b) permitaccesstoconductexaminationsforpreventingdanger(egnon- destructivetestingofwelds);(c) havemarkedonitthesafeworkingpressureandcorrespondingtemperature;(d) haveacorrectpressuregauge;(e) haveasuitablesafetydevice(safetyvalveandorburstingdisc)havingsuch capacityandbeingsoadjustedastopreventthevesselfrombeingover- pressurised.(Asafetydevicefittedtoavesseldesignedfordyeingmaynot havesufficientcapacityforbleachingwithhydrogenperoxide-seeparagraphs 36to38.);(f) haveitssupplypipefittedwithasuitablereducingvalve,orothersuitable automaticdevice,topreventthesafeworkingpressurebeingexceededif pressureissuppliedfromanoutsidesource,egsteamorairatpressuregreater thanthesafeworkingpressureofthevessel.

Multi-bolted doors

7 Anoperatorisunlikelytoreleaseallboltsonamulti-bolteddoorunderfullpressurewithoutbeingwarnedofdangerbyagradualleakageofsteamorliquidduringtheslackeningofthebolts.However,whenthevesselisunderslightorresidualpressure,thereisadangerofdoorsstickingafteralltheboltshavebeenremovedandthedoorthenbeingviolentlyblownopenwhenfreed.Tofacilitatethesafereleaseofanyresidualpressure,thedoorshouldbefittedwithadevicetoeitherbreakthesealortorestrainthedoorfromopeningmorethan3mm.Typically,aswingboltmaybefittedoppositethehingeinwhichitstrappednutisrestrainedbythedoorhousinguntilthesealisbrokenandthedooriscrackedopenedby3mm.



Quick-opening doors (other than multi-bolted doors)

8 Pressurevesseldoorsofthequick-openingtypeshouldbefittedwiththefollowingdevices.

(a) Aninterlockbetweenthedoor-lockingmechanismandthepressurisingsystem, eg (i) Ifpressureisappliedbysteam,liquid,airorothergases,theinletvalve shouldbeinterlockedwiththedoor-lockingmechanisminsuchamanner astopreventthevalvebeingopenedtopressurisethevesseluntilthedoor isfullyclosedandlocked. (ii) Ifthepressureisappliedbyboilingtheliquoruntilsteamisformed,then thereshouldbeaninterlockwhichpreventsheatbeingapplieduntilthe doorisfullyclosedandlocked.Theinterlockshouldalsoensurethatthe sourceofheatisturnedoffbeforethedoorcanbeunlocked. (iii) Ifthevesselispressurisedbyanexternalpumpthenthereshouldbean interlockwhichpreventsthepumpfromapplyingpressureuntilthedooris fullyclosedandlocked.Theinterlockshouldalsoensurethatthepumpis switchedoffbeforethedoorcanbeunlocked.

(b) Aninterlockbetweenthedoor-lockingmechanismandthemainvent,arranged sothattheventmustbeopenbeforethedoorcanbeunlocked(butitcanbe closedoncethedoorisclearoftheseal).Note:Itissometimesnecessaryto carryoutnon-pressurisedorlowtemperaturedyeingwiththedoorofthe vesselopenbutitshouldnotbepossibletocommenceahightemperature dyeingcyclewiththedoorpartiallyclosed.(c) Atest-cock,unlessthemainventoutletisclearlyvisibletotheoperativeatthe vesseldoor.Thetest-cockshouldbesituatedatalevelbelowthevesseldoor andsointerlockedthatithastobeopenedbeforethedoorcanbeunlocked. Thetest-cockshouldgiveaudibleorvisualindicationastowhetherthevessel isstillpressurisedorhashotliquidabovethedoorlevel.Theboreofthe test-cockshouldbelargeenoughtoavoidblockage,typicallyatleast12mm.

Figure 1Hightemperaturedyerforfabricwithmulti-bolteddoors



(d) Arestraint,toholdthedoorafterithasbeenunlockedandtopreventit openingviolentlybyanyresidualpressureremaininginthevesselnotindicated eitherbythetest-cockorpressuregauge,egacatchwhichhastobeopened independentlyafterthedoorhasbeenunlockedandwhichmaynotbe releaseduntilthedoorhasbeenunlockedandcrackedopen.Alternatively,a hydraulicorpneumaticdamperorram,designedtoactasaneffectiverestraint tothedoormovement,maybeused.(e) Atemperaturesensitiveinterlock,topreventthedoorbeingopenedwhilethe temperatureoftheliquorinsidethevesselexceeds80°C.Thetemperature sensingprobeofsuchaninterlockshouldbelocatedinapositionsothatit normallyregistersthehighesttemperatureinthesystem.Thedeviceshould fail-safe,ieiftheinterlockisnotinplace,thenthetemperaturemaynotexceed 80°C.Wherethenormalflowofliquorisdisruptedordistorted,egbyfailureof pumpormotor,orbyjammingofvalvesorentanglementoffabric,then extremecareisnecessarytoensurethatthewholeofthemachineandits contentsarecooledtoasafetemperaturebeforethevesselisopened.

Interlocks

9 Whileitispreferableforinterlockingsystemsondyeingmachinestobesimpleandmechanicalinoperation,itissometimesimpracticabletoachievethis.Aninterlockingkeysystemisoftenappropriate,egonsamplingdevices.

10 Allinterlockingsystems,whethermechanically,electrically,pneumaticallyorhydraulicallyoperated,shouldfail-safeintheirmodeofoperation.

Figure 2Verticalcylindricalhightemperaturedyeingmachineforyarnpackages,withquickopeningdoor



11 Whensafetydependsuponelectricalsystems,andnootherback-upsafetydevicesareprovided,integritycanbeimprovedbyfittingtwolimitswitchesdesignedtooperateinoppositemodes.Whereelectricalinterlocksareusedforsafetypurposesthecircuitshouldbecompletelyindependentofanyothersystem.AdviceontheapplicationofelectricallimitswitchesisgiveninBSEN1088:19967andBS5304:1988.8Limitswitchesmountedonahightemperaturedyeingmachineoperateinanadverseenvironmentofheatandmoisture.Topreventmoisturegettingin,itisrecommendedthatswitchesfittedhaveenclosuresthatachieveaminimumratingofIP55asdefinedinBSEN60529:1992Specification for degrees of protection provided by enclosures.9

Sampling device

12 Numerousaccidentshaveoccurredwhileoperatorshavebeentakingsamplesfrompressuriseddyeingmachines.Thereareseveraldifferentmethodsofsamplingbutanysamplingdeviceshouldbeinterlockedtoensurethatthesamplingpotordeviceisdepressurised(opentodrain)beforeitcanbeopenedtoremovethesample.Itisimportantthatdesignerscarefullyconsiderthesamplingmechanismtopreventforeseeablemistakenactionsbyoperatorstakingsamples.

13 Overrecentyearsprogrammablecontrollershavebeenfittedtohightemperaturedyeingmachinestoreducecostsandensureconsistentquality.Withmanydye-housesaimingtoachieveaonestopdyeprocess,newmachinesfittedwithprogrammablecontrollersareoftensuppliedwithoutasamplingdeviceandthemachinemustbestoppedinmid-cycleandthemainlidopened.Insuchsituationsthedoorinterlocks(seeparagraphs7-11)shouldensurethattheliquoriscooledandanypressurewithinthevesselisrelievedpriortosampling.

Installation and modification

14 Installersshouldensurethatthemethodofinstallationdoesnotgiverisetodanger.Hotwork,suchascuttingorwelding,whichmayaffectmechanicalintegrityshouldnotbecarriedoutwithouttheagreementofacompetentperson.Itisgoodpracticetoensurethatpipeworkandfittingsdonotobscurepressuregaugesandmanufacturer’smarkingsorobstructpartsofthedyeingmachinewhereaccessisrequiredforexamination.

15 Whenmachinesareinterconnectedviaacommondrainorblow-downline,itisrecommendedthatanon-returnvalveandanisolatingvalvearefittedineachline.Thisistopreventthepossibilityofsteamandhotwaterbeingtransferredfromonedyeingmachinetoanotherinwhichpersonnelmaybeworking,forexampleduringmaintenance.UsefuladviceisgiveninHSEGuidanceNotePM60Steam boiler blow-down systems.10

16 Acompetentpersonshouldbeconsultedbeforeworkbeginsonanymodificationsorrepairsthatmayaffectthevesselintegrityortheoperationofanyprotectivedevices.

Information provided by the supplier

17 Suppliershaveadutytoprovidesufficientwritteninformationtoenabletheusertooperatetheequipmentsafely.Typically,thisinformationwouldincludethemaximumpermissibleworkingpressureandtemperature.

18 Suppliersalsohaveadutytoprovidesufficientinformationconcerningthedesign,construction,examination,operation,andmaintenanceoftheplantto



assisttheusertoprepareawrittenschemeofexaminationunderPSR.Itishelpfulforthemanufacturertoprovideasamplewrittenschemeofexaminationastheywillknowhowtheequipmentisdesignedtooperate,itsanticipatedlife,andtheinitialfrequencyofexamination.

Operations19 Inadditiontostructuralfailures,itisimportanttorememberthathumanfailurescanleadtoaccidents.Sooftenandfrequentlyafterlongassociationwithaprocess,eventhebesttrainedoperatorscanbecomecomplacentandpronetoerror.Itisthereforeessentialthatalloperatorsareadequatelytrainedandsupervised.ThePSRrequireuserstoestablishthesafeoperatinglimits,andtoensurethattheequipmentisoperatedwithinthem.Themanufacturer’sinstructionsoradviceonoperationshouldbemadereadilyavailabletooperatorsandshouldbefollowedstrictly.

20 Operatingpersonnelshouldbesurethatvesselsarecompletelyventedbeforeattemptsaremadetoopenlidsordoors,andtheyshouldbemadeawareofthedangersofbypassingsafetydevicesandofusingextensionstohandlesofdoor-openingmechanisms.Theyshouldalsobefamiliarwiththefunctionsandoperationsofvariouscontrolsandsafetydevicesusedwiththeunitandshouldreportatonceanymalfunctionordamagedcomponents.Managementareadvisedtokeeprecordsofreportedmalfunctionssothattheycanidentifytrendsandtakeappropriateremedialaction.

21 Atjetdyeingmachinesinparticular,attemptsatunblockingtangledfabricmayreleasepocketsofliquorwhichcanbeatahighertemperaturethanismeasuredbythetemperaturesensingprobeandthismayflashintosteamwhenreleased.Itisthereforevitalthatcorrectproceduresarefollowedandtheseshouldbesetoutinasafesystemofwork,whichmayincludetheuseofsuitableprotectiveclothingandfaceshields.

Figure 3Schematicofhightemperaturedyerforfabric



MaintenanceLids and doors

22 Itisrecommendedthatapreventativemaintenanceschemebeemployedtomakesuretherearenofaultsormissingpartsonthedoormechanismsandthatthevariouscontrolsorsafetydevicesarefunctioningcorrectly.Wherelimitswitchesareusedinthedooropeninginterlockcircuitsitisimportantthatthemechanicaloperationoftheswitchesisregularlytestedinadditiontoanyelectricaltestcarriedoutduringroutinemaintenance.Accidentshaveoccurredduetoswitchescominglooseontheirmountings,throughwearontherollersandcams,andincorrectpositioningsothattheswitchcontactsopenafterthedoorhasbeencrackedopen.Anyfaultsordefectsshouldbereportedtoaresponsiblepersonandremediedbeforethevesselisre-used.

23 Itisrecommendedthatthebearingsurfacesofthedoorlockingdevicesberegularlychecked.Ifcracksorotherdefectsaresuspectedinthevesselordooroperatingmechanism,thevesselshouldbetakenoutofuseandacompetentpersonconsultedimmediatelytodeterminewhethertheintegrityofthevesselhasbeencompromised.Repairsshouldbecarriedoutinaccordancewithparagraph16.

24 Whenadoor-lockingmechanismisdesignedtopermitreleaseintwostages,itismostimportantforthegapbetweenthecoverandthesealtobesufficientlywidetoensurepressureequilibrium(generallyatleast3mm).Thisgapshouldnotbereducedbytheuseofnewseals.Thecorrectjointsizeshould,therefore,beestablishedandonlyreplacementsealsrecommendedbythemanufacturerused.Twostagedoorsshouldneverbemodifiedtogivesinglestageopening.

Operating procedure

25 Beforeeverydyecycle,itisgoodpracticetocheckthedoor-lockingmechanisminboththeopenandclosedpositionstoensurethatengagementofthelockingdeviceisevenandcompleteovertheentirecircumference,andthatthedoorlocatescorrectlyeachtimeitisclosed.

26 Afterloadingthevesselandbeforeitisclosed,alldirtandspillageshouldbecleanedfromthelockingpartsofthedoorandthejointexaminedtoconfirmitisproperlyseatedinthegroove.

27 Thedoorsafetydevicesshouldneverbeforcedintoposition.Anyresistancetoclosingorlockingshouldbeinvestigatedimmediately,andrectifiedbeforethemachineisputintouse.Careshouldbetakenthatthelockingringsofdoorsdonotbindduringrotation,otherwisethepointoffrictioncanbecomeafulcrumleadingtohighstresseswhichcancausefailure.

Vents and pressure relief devices

28 Itisimportantthatventdevicesaredesignedsothatproofofclearwaycanbeestablishedbeforecoversareopened.Itispreferablethatdischargeoutletsarevisibletooperatingpersonnel,andareledtoasafeplace.

29 Aneffectivemaintenanceregimewillensurethatthesafetyvalvesareingoodorderandthattheyoperateatthesetpressure.Whereloosestockisdyed,fibresmayaccumulateinthereliefvalveoritsassociatedpipeworkwhichwouldimpede



efficientventing.Usersareadvisedtocheck,andwherenecessaryclean,thesafetyvalveatregularintervals.Theexaminationandsettingofthesafetyvalveshouldbeincludedinthewrittenschemeofexamination.Itisimportanttotestpressuregaugesregularly.

Common drain and blow-down lines

30 Ifablow-downpitormufflersystemisinstalleditisimportantthatitisinspectedfrequentlytoverifythatthedrainsystemisnotblockedduetodeteriorationand/orsludge.

31 Maintenancestaffhavebeeninjuredwhenadjacentmachineshaveventedintoacommonpit.Ventingcanoccurduringthenormaldyecycleorifadrainvalveisunintentionallyopened.Itisrecommendedasafesystemofworkisemployedthatincludestheisolationofthemachinebeingworkedon.

Thorough examination32 ThePSRrequiretheuserofahightemperaturedyeingmachinetoensurethatawrittenschemeofexaminationisdrawnup,certifiedassuitablebyacompetentperson,andthatthevesselisexaminedinaccordancewiththewrittenscheme.Thewrittenschemeofexaminationshouldspecifythenatureandfrequencyoftheexaminationsnecessarytopreventdangerandshouldtakeaccountofknownfailuremechanismssuchascorrosion,erosion,andfatigue.Itshouldbereviewedovertimetoreflectchangesinoperatingconditionsandanydeteriorationdetectedonpreviousexaminations.Adviceonthepreparationofawrittenschemeofexaminationcanbesoughtfromthemanufacturerorsupplier(seeparagraphs17and18).

33 UsershaveadutyunderthePSRtokeeprecordsofpreviousreportsofexaminationandanydocumentsthatwillassistthecompetentpersontoassesswhetherthevesselisfitforfurtheroperation.Itisrecommendedthatrecordsbekeptofallmaintenanceandremedialworkcarriedout.Recordsforeachindividualdyeingvesselshouldbekept,togetherwithentriescountersignedbyaresponsibleperson.

34 Regulation12(protectionagainstspecifiedhazards)oftheProvisionandUseofWorkEquipmentRegulations199211(PUWER)concernstherequirementtopreventtheunintendedorprematuredischargeofanygas,liquidorvapourstoredinworkequipmentsuchasahightemperaturedyeingmachine.Asthecorrectoperationofthedoorinterlocksiscrucialtopreventingdanger,theintegrityofdoorinterlocksshouldbeexaminedperiodically.Whereusersdonotpossessthenecessaryin-houseexpertise,competentspecialistsshouldbeconsulted.

35 AhightemperaturedyeingmachinewillnotbesubjecttothePSRifitdoesnotemploysteamandcannotbeoperatedabove110°C.However,tocomplywiththeirdutiesunderPUWER,employersareadvisedtoensurethatsuchvesselsareexaminedatregularintervalsbyacompetentperson.Theperiodbetweenexaminationsshouldreflecttheriskofinjuryfromstoredenergyandscalding.Anyfaultsrevealedduringtheexaminationshouldbereportedtoaresponsiblepersonandremediedbeforethepressurevesselisre-used.



Use of hydrogen peroxide (H2O2)36 Hydrogenperoxideissometimesusedasableachingagentintextilefinishingprocesses.IfthechemicalreactionduringperoxidebleachingisnotstrictlycontrolledtherecanbearapidevolutionofoxygencausedbythedecompositionoftheH2O2.Therapidityofthereactionandthevolumeofoxygenproducedmaybebeyondthecapacityofthereliefdevicesandthevesselmayfailcatastrophically.Thevesselcouldalsofailduetostresscorrosioncrackingifitwasnotdesignedorconstructedforperoxidebleachingusinganappropriategradeofausteniticstainlesssteelorothersuitablematerialresistanttoattack.FurtheradviceontheexplosionrisksatpressurevesselsusedforbleachingwithhydrogenperoxideisgiveninHSEInformationDocumentHSE764/3.12

Design

37 Toreducetheriskofexplosion,itisrecommendedthattheconcentrationofthebleachingliquor,normallyexpressedinmillilitres/litre(ml/l)orgrammes/litre(g/l)doesnotexceed14mlof35%H2O2perlitreofliquor(16g/l).Atthatconcentrationthepressurevesselheatingsystemshouldlimittherateoftemperaturerisetoamaximumof6°C/min.Ifahigherconcentrationisrequiredaseparateassessmentshouldbecarriedoutastothestabilityoftheperoxideandthecapacityofthepressurereliefsystem.Itisstronglyrecommendedthattheuserseekadvicefromtheperoxidesupplier.

38 Thereliefdevicesshouldbeproperlysizedforadischargecapacitybasedonthemaximumforeseeableconcentrationofperoxide,andtheyshouldensurethatthedesignpressurecannotbeexceededbymorethan10%.Thereliefdevicesshouldalsobesizedfortwophaseflowconditions,andventtoasafeplace.

Operations

39 Usersareadvisedtoimplementprocedurestodefinethevariousrecipesandconditionsunderwhichbleachingtakesplacetoensurethatthemaximumconcentrationofthedosingsolutionisnotexceeded.

40 Peroxidebleachingsolutionmustalwaysbedilutedbeforeitistransferredtothevessel.Atemperatureinterlockshouldbeprovidedsothatthebleachingsolutioncannotbetransferredtothepressurevesselifthetemperatureofthesolutionexceeds45°C.

Figure 4Hightemperaturejetdyeingmachineforfabric



41 Asafemethodofcontrollingtheconcentrationofhydrogenperoxideistoinstallavolumetrictankbeforetheadditionstankofthedyeingmachine.Thevolumetrictankshouldbesizedatthemaximumsafevolumeofhydrogenperoxidethatthevesselcanacceptandbefittedwithanoverflowpipe.Beforethelineconnectingtheadditionstanktothevesselcanbeopened,thefeedtotheadditionstankhastobeisolatedtopreventfurtherperoxideflow.

42 Operatorsshouldbeawareofthehazardsofperoxidebleachingandbeproperlytrainedtocarryouttheprocessinsafety.

Maintenance

43 Whenusinghydrogenperoxideitisvitaltohaveaneffectivemaintenancesystemforcheckingandcleaningofthepressurereliefsystems(seeparagraph29)

Thorough examination

44 Thewrittenschemeofexaminationshouldrefertotheintendeduseofthevesselandthesuitabilityofthevesselanditsprotectivedevicesforusewithhydrogenperoxide.Reportsofexaminationsunderthewrittenschemeshouldalsorefertothevessel’suseandwhetherornotitisfitforthepurpose.



References1 The Pressure Systems and Transportable Gas Containers Regulations 1989StatutoryInstrument1989No2169HMSOISBN0110981693

2 Safety of pressure systems. Pressure Systems and Transportable Gas Containers Regulations 1989. Approved Code of PracticeCOP37HSEBooks1990ISBN011885514X

3 A guide to the Pressure Systems and Transportable Gas Containers Regulations 1989HS(R)30HSEBooks1990ISBN0717604896

4 Introducing competent persons: Pressure Systems and Transportable Gas Containers Regulations 1989HSEleafletIND(S)29HSEBooks.AvailableinpricedpacksISBN0717608204

5 Written schemes of examination: pressure systemsHSEleafletIND(G)178HSEBooks

6 BritishStandardBS5500:1994Specification for unfired fusion welded pressure vessels

7 BritishStandardBSEN1088:1996Safety of machinery - interlocking devices associated with guards. Principles for design and selection

8 BritishStandardBS5304:1988Code of practice for safety of machinery

9 BritishStandardBSEN60529:1992Specification for degrees of protection provided by enclosures

10 HSEGuidanceNotePM60Steam boiler blow-down systemsHSEBooks1987ISBN0118839497

11 The Provision and Use of Work Equipment Regulations 1992StatutoryInstrument1992No2932HMSOISBN0110258495

12 Explosion risk at pressure vessels used for bleaching textile materials with hydrogen peroxideHSEInformationDocumentHSE764/3

13 BritishStandardBSENISO11111:1995Safety requirements for textile machinery

Thefutureavailabilityandaccuracyofthereferenceslistedinthispublicationcannotbeguaranteed.

Further informationForinformationabouthealthandsafetyringHSE’sInfolineTel:08453450055Fax:08454089566Textphone:08454089577e-mail:[email protected],CaerphillyBusinessPark,CaerphillyCF833GG.

HSEpricedandfreepublicationscanbeviewedonlineororderedfromwww.hse.gov.ukorcontactHSEBooks,POBox1999,Sudbury,SuffolkCO102WATel:01787881165Fax:01787313995.HSEpricedpublicationsarealsoavailablefrombookshops.

BritishStandardscanbeobtainedinPDForhardcopyformatsfromtheBSIonlineshop:www.bsigroup.com/ShoporbycontactingBSICustomerServicesforhardcopiesonlyTel:02089969001e-mail:[email protected].

TheStationeryOfficepublicationsareavailablefromTheStationeryOffice,POBox29,NorwichNR31GNTel:08706005522Fax:08706005533e-mail:[email protected]:www.tso.co.uk(Theyarealsoavailablefrombookshops.)StatutoryInstrumentscanbeviewedfreeofchargeatwww.opsi.gov.uk.

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