Environmental Engineering Reference
In-Depth Information
•.
The.base.rests.on.a.irm.level.surface.
•.
The.jack.is.correctly.centered.
•.
The.jack.head.bears.against.a.level.surface.
•.
The.lift.force.is.applied.evenly.
Proper.maintenance.of.jacks.is.essential.for.safety..All.jacks.must.be.inspected.before.
each.use.and.lubricated.regularly..If.a.jack.is.subjected.to.an.abnormal.load.or.shock,.
it.should.be.thoroughly.examined.to.make.sure.it.has.not.been.damaged..Hydraulic.
jacks.exposed.to.freezing.temperatures.must.be.illed.with.adequate.antifreeze.liquid.
lAdders, FIxed (29 cFr 1910.27)
A.ixed.ladder.must.be.able.to.support.at.least.two.loads.of.250.pounds.each,.con-
centrated.between.any.two.consecutive.attachments..Fixed.ladders.also.must.support.
added. anticipated. loads. caused. by. ice. buildup,. winds,. rigging,. and. impact. loads.
resulting.from.using.ladder.safety.devices..Fixed.ladders.must.be.used.at.a.pitch.no.
greater.than.90.degrees.from.the.horizontal,.as.measured.from.the.back.side.of.the.
ladder.(see.Figure 25.17).
FIgure 25.17
An.example.of.a.ixed.ladder.
