PT Bhaita Wire Rope Inspection Procedure

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INSPECTION OF WIRE ROPE

SLINGS PROCEDURE Page 1 of 4
PT. BHAITA
Authorized by: Director Issued by: HSE Dept. Date of issue: Aug, 2009
INSPECTION OF WIRE ROPE SLINGS
Guidelines
Store slings in a manner that will protect them from
damage by moisture, heat, corrosion or physical
abuse.
Determine that the sling is being used in accordance
with the rated capacity as listed in the current
catalog of the sling manufacturer.
Apply the following criteria for rejection when
examining a sling.
Broken wire criteria

For strand laid and single part slings - ten randomly
distributed broken wires in one rope lay or five
broken wires in one strand in one rope lay.
(The length of lay in a wire rope is the length of
travel which any strand makes in one full revolution
about the wire rope core.).
Abrasion, scrubbing or peening causing loss of more
than 1/3 the original diameter of outside individual
wires.
Evidence of rope deterioration from corrosion.
Kinking, crushing or other damage that results in
detrimental distortion of the rope structure.
Any marked reduction in diameter either along the
entire main length or in one section.
Unlaying or opening up of a tucked splice.
Core protrusion along the main length.
End attachments that are cracked, deformed, worn or loosened.
Any indication of strand or wire slippage in end attachments.
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PT. BHAITA
SLINGLINE MAINTENANCE
Due to the importance of the slingline during mast raising and lowering, BHAITA
considers it imperative to perform proper slingline maintenance before and after each
use. While it might be possible to develop a formula that would indicate the service
life for a sling-line, variations in operational and environmental conditions could
reduce the effectiveness of the formula. For these reasons BHAITA considers a
thorough visual inspection and, if necessary, a certified test pull to be the safest and
most accurate method of determining the service life of a slingline.
The following information is provided to assist operational personnel in performing

proper slingline maintenance.
SLINGLINE INSPECTION
As indicated above, the best way to determine whether a slingline has outlived its
usefulness is by means of a visual inspection. Although some personnel might
consider such an inspection an imposition on their time, the benefits of the inspection
heavily offset the time required. During the inspection, consideration should be given
to three principle factors that can affect the life of a slingline. These are wear due to
operation, corrosion and incidental damage. When conducting the inspection, the
following points may be used as general guidelines in determining the type and
extent of wear on the slingline.
a) Wear Due to Operation
This can be defined as that wear which occurs through the normal use
of the slingline. This type of wear is primarily evident in the areas near
the slingline sockets and those sections of the slingline which bend and
travel over sheaves. Emphasis should be placed on locating broken
wires, elongation and reduction in area of the wire rope.
Although Appendix A of API Spec. 4E states that "a line with any
broken wires should be replaced", some wire rope manufacturers

consider this too strict and make allowance for two broken wires before
retiring the slingline from service. The inspection of the slingline for
broken wires must be very thorough, since much of the time the breaks
occur on the inner wires that form the strands. Wire rope manufacturers
suggest the best time to inspect for broken wires is after the mast has
been raised or lowered and the load on the wires is relaxed.
Elongation of the wire rope in a slingline is a good indicator of how
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PT. BHAITA
much it has been worked. While wire rope is designed to have a certain
amount of elasticity, an overworked wire rope or slingline will tend to
stretch without returning to its normal lay length. The length of lay in a
wire rope is the length of travel which any strand makes in one full
revolution about the wire rope core. When a significant increase in the
length of the lay is evident in any section of the slingline, it should be
replaced. The API specifications for wire rope used in slinglines (6 x 19
classification, 6 x 37 classification) states that the length of lay should
not exceed 7-1/4 times the nominal diameter of the rope. Again,
however, it may be advisable to consult the wire rope manufacturer
regarding specific measurements. When inspecting slinglines for
elongation the critical areas are those sections for the rope which pass
over sheaves.
Reduction in area due to abrasion is another indicator of how much a

slingline has been worked. Again the critical areas are those sections of
the slingline which bend and pass over sheaves. Included in this
category is reduction in rope diameter due to core failure. Any slingline
that shows a reduction in rope diameter should be replaced. The
diameter of the rope can easily be measured at several locations along
the line with a pair of calipers, and these measurements can be
compared to those taken when the rope was new.
b) Wear Due to Corrosion
This type of wear is primarily evident in the slinglines that have not
been maintained through proper slingline lubrication. The damage may
be due to operational or environmental conditions; but once the rust or
corrosion has penetrated the inner surfaces of the strands and wires,
the slingline should be replaced. The reason here is that free
movement required to develop the full strength of the rope is prohibited
by the presence of the corrosion. The best way to guard against this
type of wear is to periodically lubricate the wire rope. Check with the
wire rope manufacturer regarding the appropriate type of lubricant for
use in a specified territory.
c) Wear Due to Incidental Damage
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PT. BHAITA
Incidental damage is due to incorrect handling of sling-lines. This may

result in bends, kinks or birdcages in the wire rope is reason for
slingline replacement. Slinglines should not be left hanging in the mast,
but should be stored on reels or coils. Proper handling and storage of
slinglines is similar to any other wire rope product and is discussed
elsewhere in this manual.
CERTIFIED TEST PULL

If a good visual inspection for the slingline reveals little in terms of damage due to
operation, corrosion or incidental damage, a certified test pull may prove helpful in
determining the safety of the slingline. Due to the variations in mast design, the
nominal strength of the slinglines used will differ. Reference should be made to the
revving diagrams for detailed information.
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Rev:

INSPECTION OF WIRE ROPE

INSPECTION OF WIRE ROPE SLINGS

Broken wire criteria

The following information is provided to assist operational personnel in performing

a) Wear Due to Operation

broken wires should be replaced", some wire rope manufacturers

Elongation of the wire rope in a slingline is a good indicator of how

Reduction in area due to abrasion is another indicator of how much a

c) Wear Due to Incidental Damage

Incidental damage is due to incorrect handling of sling-lines. This may

CERTIFIED TEST PULL

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