Safety 1st Advancer Manual del operador descargar pdf (Pagina 71)

Environmental Remediation Drilling

Safety Guidelines

Page 71 of 132

4.10.1 - Wire Rope Safety

Worn or misused wire rope is potentially one of the most dangerous pieces of equipment on any drilling rig.

When a wire rope breaks, it is typically under significant tension and therefore has a tendency to snap back,

like a rubber band. Be constantly aware of the condition of wire rope, which is used to hoist drill pipe or

other heavy object. Wire rope used for such purposes and has begun to fray or unravel, or which has a

number of breaks, should be removed from service and replaced prior to mobilization. This also applies to

hemp rope, which is used to hoist the hammer during split-spoon sampling. See the chart below.

Mechanical damage due to

rope movement over sharp

edge projection while under

load.

Typical wire fractures because of

bending fatigue.

Localized wear due to abrasion on supporting

structure. Vibration of

rope between drum and jib

head sheave.

Wire fractures at the strand, or core

interface, as distinct from crown

fractures, caused by failure of core

support.

Narrow path of wear resulting in fatigue fractures,

caused by working in a

grossly oversize groove, or

over small support rollers.

Strand core protrusion because of torsional unbalance

created by drop ball or other shock

loading application.

Two parallel paths of broken wires indicative of

bending through an

undersize groove in the

sheave.

Break up of IWRC resulting from

high stress application. Note nicking

of wires in outer strands.

Severe wear, associated

with high tread pressure.

Protrusion of fiber main

core.

Typical example of localized wear

and deformation created at a

previously kinked portion of rope.

Severe wear in Lang Lay,

caused by abrasion or

cross-over points on multi-

layer coiling application.

Multi strand rope bird-caged due to

torsional unbalance. Typical of build

up seen at anchorage end of multi-fall

crane application.

Corrosion of severe degree

caused by immersion of

rope in chemically treated

water.

Protrusion of IWRC resulting from

shock loading.

Figure 4.1 – Types of Wire Rope Wear

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