GB/T 5972-2023Cranes - Wire ropes - Care and maintenance, inspection and discard (English PDF)

3.1 nominal diameter

d

diameter by which the rope is designated

3.1 nominal diameter

d

diameter by which the rope is designated

3.2 measured diameter

actual diameter dm

average of two measurements, taken at right angles to one another, of the diameter that circumscribes the rope cross-section

3.2 measured diameter

actual diameter dm

average of two measurements, taken at right angles to one another, of the diameter that circumscribes the rope cross-section

3.3 reference diameter

dref

measured diameter (3.2) of a section of rope that is not subject to bending, taken directly after running in the new rope

Note: This diameter is used as the baseline for uniform change in diameter.

3.3 reference diameter

dref

measured diameter (3.2) of a section of rope that is not subject to bending, taken directly after running in the new rope

Note: This diameter is used as the baseline for uniform change in diameter.

3.4 cross-over zone

that portion of rope coincident with a crossing over of one wrap by another as the rope traverses the drum or rises from one layer to the next at the drum flange

3.4 cross-over zone

that portion of rope coincident with a crossing over of one wrap by another as the rope traverses the drum or rises from one layer to the next at the drum flange

3.5 wrap

one revolution of rope around a drum

3.5 wrap

one revolution of rope around a drum

3.6 reel

flanged spool on which rope is wound for shipment or storage

3.6 reel

flanged spool on which rope is wound for shipment or storage

3.7 wire rope periodic inspection

in-depth visual inspection of the rope plus measurement of the rope and, if practicable, an assessment of its internal condition

Note: If required, this may include an MRT (3.11) performed by a person competent in the operation of MRT equipment and interpretation of trace data.

3.7 wire rope periodic inspection

in-depth visual inspection of the rope plus measurement of the rope and, if practicable, an assessment of its internal condition

Note: If required, this may include an MRT (3.11) performed by a person competent in the operation of MRT equipment and interpretation of trace data.

3.8 competent person

person having such knowledge and experience of wire ropes on cranes and hoists as is necessary for that person to assess the condition of the rope, make a judgement as to whether it may remain in service and stipulate the maximum time interval between inspections

Note: If an MRT (3.11) is required, it has to be performed by a competent person in that discipline.

3.8 competent person

person having such knowledge and experience of wire ropes on cranes and hoists as is necessary for that person to assess the condition of the rope, make a judgement as to whether it may remain in service and stipulate the maximum time interval between inspections

Note: If an MRT (3.11) is required, it has to be performed by a competent person in that discipline.

3.9 valley wire break

wire break that occurs at the inter-strand contact point or valley area between two outer strands

Note: Outer wire breaks that also occur within the rope anywhere between one valley area and the next - see Figure 1 - including any strand-core breaks, may also be regarded as valley wire breaks The red lines indicate the contact points and the location of the valley breaks.

3.9 valley wire break

wire break that occurs at the inter-strand contact point or valley area between two outer strands

Note: Outer wire breaks that also occur within the rope anywhere between one valley area and the next - see Figure 1 - including any strand-core breaks, may also be regarded as valley wire breaks The red lines indicate the contact points and the location of the valley breaks.

3.10 severity rating

amount of deterioration expressed as a percentage towards discard

Note: The rating may relate to either an individual mode of deterioration [e.g. broken wires, decrease in diameter or loss of metallic area as detected by MRT (3.11)] or the combined effect of more than one mode of deterioration, e.g. broken wires and decrease in diameter.

3.10 severity rating

amount of deterioration expressed as a percentage towards discard

Note: The rating may relate to either an individual mode of deterioration [e.g. broken wires, decrease in diameter or loss of metallic area as detected by MRT (3.11)] or the combined effect of more than one mode of deterioration, e.g. broken wires and decrease in diameter.

3.11 magnetic rope test; MRT

non-destructive testing (NDT) based on the measurement of the magnetic flux leakage of a magnetized rope

3.11 magnetic rope test; MRT

non-destructive testing (NDT) based on the measurement of the magnetic flux leakage of a magnetized rope

3.12 test head

device on that part of the MRT (3.11) instrument positioned around the rope during testing which generates the magnetizing field and contains the detecting or sensing elements

3.12 test head

device on that part of the MRT (3.11) instrument positioned around the rope during testing which generates the magnetizing field and contains the detecting or sensing elements

3.13 base trace

signals on the MRT (3.11) recording display as the rope travels through the test head on the first occasion that it is tested

Note: The trace is the datum against which future in-service deterioration effects are compared. The trace reflects the construction of the rope and changes in magnetic characteristics of the rope along its length, e.g. magnetic permeability differences.

3.13 base trace

signals on the MRT (3.11) recording display as the rope travels through the test head on the first occasion that it is tested

Note: The trace is the datum against which future in-service deterioration effects are compared. The trace reflects the construction of the rope and changes in magnetic characteristics of the rope along its length, e.g. magnetic permeability differences.

3.14 local fault; LF

local flaw

short discontinuity in the wire rope.

Note: Such as a wire break, welded wire, corrosion pit or inter-strand nicking

3.14 local fault; LF

local flaw

short discontinuity in the wire rope.

Note: Such as a wire break, welded wire, corrosion pit or inter-strand nicking

3.15 loss of metallic area; LMA

change in metallic cross-sectional area expressed as percentage of nominal metallic cross-sectional area of the new rope

Note: Loss of metallic area is normally associated with damage such as uniform corrosion, wear, abrasion/mechanical damage or wire breaks.

3.15 loss of metallic area; LMA

change in metallic cross-sectional area expressed as percentage of nominal metallic cross-sectional area of the new rope

Note: Loss of metallic area is normally associated with damage such as uniform corrosion, wear, abrasion/mechanical damage or wire breaks.

4.1 General

In the absence of any instructions provided by the manufacturer of the crane in the operator's manual and/or provided by the manufacturer or supplier of the rope, the general principles given in 4.2 to 4.7 shall be followed.

GB/T 5972-2023 is referred in:

GB 16423-2006 Safety regulations for metal and nonmetal mines *

AQ 2001-2018 Safety regulations for steel-making *

JT/T 155-2021 Automotive lift *

JB/T 9008.2-2015 Electric wire rope hoists - Part 2: Testing method padding: 6px;

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GB/T 5972-2023 Cranes—Wire ropes—Care and maintenance, inspection and discard (English) Standard No.

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Detail of GB/T 5972-2023 Standard No.

Cranes—Wire ropes—Care and maintenance, inspection and discard Chinese Name

起重机 钢丝绳 保养, 维护, 检验和报废

Chinese Classification J80

Professional Classification GB ICS Classification Issued by SAMR; SAC Issued on 2023-05-23 Implemented on 2023-12-1 Status valid Superseded by Superseded on Abolished on Superseding

4.1 General

In the absence of any instructions provided by the manufacturer of the crane in the operator's manual and/or provided by the manufacturer or supplier of the rope, the general principles given in 4.2 to 4.7 shall be followed.