Environmental Engineering Reference
In-Depth Information
All.guards.for.inclined.belts.must.conform.to.the.standards.for.construction.of.
horizontal.belts,.and.shall.be.arranged.in.such.a.manner.that.a.minimum.clearance.of.
7.feet.is.maintained.between.the.belt.and.loor.at.any.point.outside.the.guard..Where.
both.runs.of.horizontal.belts.are.7.feet.or.less.from.the.loor.or.working..surface,.the.
guard.is.to.extend.at.least.15.inches.above.the.belt.or.to.a.standard.height..An.excep-
tion.is.that.where.both.runs.of.a.horizontal.belt.are.42.inches.or.less.from.the.loor,.
the. belt. must. be. fully. enclosed. by. guards. made. of. expanded. metal,. perforated. or.
solid.sheet.metal,.wire.mesh.on.a.frame.of.angle.iron,.or.iron.pipe.securely.fastened.
from.the.loor.to.the.frame.of.the.machine.
Flywheels.located.so.that.any.part.is.7.feet.or.less.above.the.loor.or.work.plat-
form.must.be.guarded.with.an.enclosure.of.sheet,.perforated,.or.expanded.metal,.or.
woven.wire..Flywheels.protruding.through.a.working.loor.must.be.entirely.enclosed.
by.a.guardrail.and.toeboards.
Gears,.sprocket.wheels,.and.chains.must.be.enclosed.unless.they.are.more.than.
7.feet.above.the.loor,.or.the.mesh.points.are.guarded..Couplings.with.bolts,.nuts,.
or. setscrews. extending. beyond. the. lange. of. the. coupling. must. be. guarded. by. a.
safety.sleeve.
Pressure vessels (29 cFr 1910.106, 1910.216, And 1910.217)
Generally,. a. pressure. vessel. is. a. storage. tank. or. vessel. that. has. been. designed. to.
operate. at. pressures. above. 15. pounds. per. square. inch. (psi).. Recent. inspections. of.
pressure. vessels. have. shown. that. there. are. a. considerable. number. of. cracked. and.
damaged.vessels.in.workplaces..Cracked.and.damaged.vessels.can.result.in.leakage.
or. rupture. failures.. Potential. health. and. safety. hazards. of. leaking. vessels. include.
poisonings,.suffocations,.ires,.and.explosion.hazards..Rupture.failures.can.be.much.
more.catastrophic.and.can.cause.considerable.damage.to.life.and.property..The.safe.
design,. installation,. operation,. and. maintenance. of. pressure. vessels. in. accordance.
with.the.appropriate.codes.and.standards.are.essential.to.worker.safety.and.health.
Pressure.vessel.design,.construction,.and.inspection.is.referenced.in.the.ASME.
Boiler. and. Pressure. Vessel. Code,. 1968,. and. current. 1910.106(b),. 1910.217(b)(12),.
1910.261(a)(3),. and. OSHA. Technical. Manual. CPL. 2-2.208,. Chapter. 10. (Pressure.
Vessel.Guidelines)..These.set.the.guidelines.for.pressure.vessel.safety..Two.conse-
quences.result.from.a.complete.rupture:.(1).blast.effects.can.happen.due.to.a.sudden.
expansion. of. the. pressurized. luid,. and. (2). fragmentation. damage. and. injury. can.
result.if.vessel.rupture.occurs.
In.the.event.of.leakage.failure,.the.hazard.consequences.can.range.from.no.effect.
to.very.serious.effects..Suffocation.or.poisoning.can.occur,.depending.on.the.nature.
of.the.contained.luid,.if.the.leakage.occurs.into.a.closed.space..Fire.and.explosion.
can.cause.physical.hazards.when.a.lammable.luid.ignites..Chemical.and.thermal.
burns.can.result.from.contact.with.process.liquids.
Most.of.the.pressure.or.storage.vessels.in.service.in.the.United.States.have.been.
designed.and.constructed.in.accordance.with.one.of.the.following.two.pressure.vessel.
design.codes:
