Environmental Engineering Reference
In-Depth Information
cylinder. valves,. couplings,. regulators,. hoses,. and. apparatus. must. be. kept. free. of.
oily.or.greasy.substances..Do.not.drop.or.strike.cylinders..Unless.secured.on.special.
trucks,. regulators. must. be. removed. and. valve-protection. caps. put. in. place. before.
moving. cylinders.. Liqueied. gases. must. be. stored. and. shipped. valve-end. up. with.
valve.covers.in.place.
Provisions. must. be. made. to. never. crack. a. fuel. gas. cylinder. valve. near. sources.
of. ignition.. Before. a. regulator. is. removed,. the. valve. must. be. closed. and. gas. must.
be. released. from. the. regulator.. Red. is. used. to. identify. the. acetylene. (and. other.
fuel-gas). hose,. green. is. for. the. oxygen. hose,. and. black. is. for. inert. gas. and. the. air.
hose..Pressure-reducing.regulators.are.used.only.for.gas.and.the.pressures.for.which.
they.are.intended.
When. the. object. to. be. welded. cannot. be. moved. and. ire. hazards. cannot. be.
removed,.shields.must.be.used.to.conine.heat,.sparks,.and.slag..A.ire.watch.should.
be. assigned. when. welding. or. cutting. is. performed. in. locations. where. a. serious.
ire. might. develop.. When. welding. is. done. on. metal. walls,. precautions. should. be.
taken. to. protect. combustibles. on. the. other. side.. Before. hot. work. is. begun,. used.
drums,.barrels,.tanks,.and.other.containers.should.be.thoroughly.cleaned.so.that.no.
substances.remain.that.could.explode,.ignite,.or.produce.toxic.vapors.
Arc. welding. and. cutting. operations. must. be. shielded. by. noncombustible. or.
lame-retardant. screens. that. will. protect. employees. and. other. persons. working. in.
the.vicinity.from.the.direct.rays.of.the.arc..Arc.welding.and.cutting.cables.must.be.
of.the.completely.insulated,.lexible.type,.capable.of.handling.the.maximum.current.
requirement.of.the.work.in.progress..Cables.in.need.of.repair.should.not.be.used..
When.the.welder.or.cutter.has.occasion.to.leave.work.or.to.stop.work.for.any.appre-
ciable.length.of.time,.or.when.the.welding.or.cutting.machine.is.to.be.moved,.the.
power.supply.switch.to.the.equipment.should.be.shut.off..All.ground.return.cables.
and.all.arc.welding.and.cutting.machine.grounds.must.be.in.accordance.with.regula-
tory.requirements..Ground.connections.must.be.made.directly.to.the.material.being.
welded..The.open.circuit.(no-load).voltage.of.arc.welding.and.cutting.machines.must.
be.as.low.as.possible.and.not.in.excess.of.the.recommended.limits.
Under.wet.conditions,.automatic.controls.for.reducing.no-load.voltage.should.be.
used..Electrodes.must.be.removed.from.the.holders.when.not.in.use..It.is.required.
that. electric. power. to. the. welder. shut. off. when. no. one. is. in. attendance.. Suitable.
ire.extinguishing.equipment.must.be.available.for.immediate.use..The.welder.shall.
be. forbidden. to. coil. or. loop. welding. electrode. cable. around. his. or. her. body.. Wet.
machines.must.be.thoroughly.dried.and.tested.before.being.used,.thereby.decreasing.
the.risk.of.electrical.shock.or.electrocution.(see.Figure.25.24).
It.is.required.that.eye.protection.helmets,.hand.shields,.and.goggles.meet.appropri-
ate.standards..Employees.exposed.to.hazards.created.by.welding,.cutting,.or..brazing.
operations.must.be.protected.with.personal.protective.equipment.and.clothing.
WoodWorkIng mAchInery (29 cFr 1910.213)
Sufice.it.to.say,.there.would.not.be.an.OSHA.regulation.on.woodworking.machinery.
if.an.extreme.hazard.did.not.exist.for.these.fast,.sharp,.and.powerful.pieces.of.machin-
ery..For.this.reason,.speciic.precautions.must.be.undertaken.to.prevent.injuries.
