693OccupationalSafetyandHealthAdmin.,Labor§1910.254produceasourceofignition,thecar-bidechargeandfeedmechanismshallbecompletelyremoved.Allacetyleneshallbeexpelledbycompletelyflood-ingthegeneratorshellwithwaterandthegeneratorshallbedisconnectedfromthepipingsystem.Thegeneratorshallbekeptfilledwithwater,ifpos-sible,orpositionedtoholdasmuchwateraspossible.(vi)Hotrepairsshallnotbemadeinaroomwherethereareothergenera-torsunlessallthegeneratorsandpip-inghavebeenpurgedofacetylene.(g)Calciumcarbidestorage—(1)Pack-aging.(i)Calciumcarbideshallbecon-tainedinmetalpackagesofsufficientstrengthtopreventrupture.Thepack-agesshallbeprovidedwithascrewtoporequivalent.Thesepackagesshallbeconstructedwater-andair-tight.Sol-dershallnotbeusedinsuchamannerthatthepackagewouldfailifexposedtofire.(ii)Packagescontainingcalciumcar-bideshallbeconspicuouslymarked‘‘CalciumCarbide—DangerousIfNotKeptDry’’orwithequivalentwarning.(iii)Caution:Metaltools,eventheso-calledsparkresistanttypemaycauseignitionofanacetyleneandairmixturewhenopeningcarbidecon-tainers.(iv)Sprinklersystemsshallnotbeinstalledincarbidestoragerooms.(2)Storageindoors.(i)Calciumcar-bideinquantitiesnottoexceed600pounds(272.2kg)maybestoredindoorsindry,waterproof,andwell-ventilatedlocations.(A)Calciumcarbidenotexceeding600pounds(272.2kg)maybestoredindoorsinthesameroomwithfuel-gascyl-inders.(B)Packagesofcalciumcarbide,ex-ceptforoneofeachsize,shallbekeptsealed.Thesealsshallnotbebrokenwhenthereiscarbideinexcessof1pound(0.5kg)inanyotherunsealedpackageofthesamesizeofcarbideintheroom.(ii)Calciumcarbideexceeding600pounds(272.2kg)butnotexceeding5,000pounds(2,268kg)shallbestored:(A)Inaccordancewithparagraph(g)(2)(iii)ofthissection;(B)Inaninsidegeneratorroomoroutsidegeneratorhouse;or(C)Inaseparateroominaone-storybuildingwhichmaycontainotheroc-cupancies,butwithoutcellarorbase-mentbeneaththecarbidestoragesec-tion.Suchroomsshallbeconstructedinaccordancewithparagraphs(f)(6)(i)(H)and(f)(6)(i)(I)ofthissectionandventilatedinaccordancewithparagraph(f)(6)(ii)ofthissection.Theseroomsshallbeusedfornootherpurpose.(iii)Calciumcarbideinexcessof5,000pounds(2,268kg)shallbestoredinone-storybuildingswithoutcellarorbase-mentandusedfornootherpurpose,orinoutsidegeneratorhouses.Ifthestor-agebuildingisofnoncombustiblecon-struction,itmayadjoinotherone-storybuildingsifseparatedtherefrombyunpiercedfirewalls;ifitisdetachedlessthan10feet(3m)fromsuchbuild-ingorbuildings,thereshallbenoopen-inginanyofthemutuallyexposingsidesofsuchbuildingswithin10feet(3m).Ifthestoragebuildingisofcom-bustibleconstruction,itshallbeatleast20feet(6.1m)fromanyotherone-ortwo-storybuilding,andatleast30feet(9.1m)fromanyotherbuildingex-ceedingtwostories.(3)Storageoutdoors.(i)Calciumcar-bideinunopenedmetalcontainersmaybestoredoutdoors.(ii)Carbidecontainerstobestoredoutdoorsshallbeexaminedtomakesurethattheyareingoodcondition.Periodicreexaminationsshallbemadeforrustingorotherdamagetoacon-tainerthatmightaffectitswaterorairtightness.(iii)Thebottomtierofeachrowshallbeplacedonwoodenplankingorequivalent,sothatthecontainerswillnotcomeincontactwiththegroundorgroundwater.(iv)Containersofcarbidewhichhavebeeninstoragethelongestshallbeusedfirst.[55FR13696,Apr.11,1990,asamendedat55FR32015,Aug6,1990;55FR46053,Nov.1,1990;61FR9241,Mar.7,1996;72FR71070,Dec.14,2007]§1910.254Arcweldingandcutting.(a)General—(1)Equipmentselec...
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