Wire Rope Sling Inspection

Wire Rope Sling Inspection

Tali tambang harus diperiksa oleh orang yang kompeten setiap hari sebelum digunakan dan selama penggunaan. Sling harus tidak digunakan ketika beberapa kondisi di bawah ini ditemukan :

1. Hook dan pengunci berubah bentuk atau rusak (jika ada)
2. Tidak ada identifikasi pembuat, tingkat beban, diameter

Menurut Standard :

BRITISH STANDARD BS EN 13411-3 : 2004 (Terminations for steel wire ropes — Safety — Part 3: Ferrules and ferrule-securing)

The length (h) of a soft eye from the ferrule to the bearing point of the eye shall be at least fifteen (15) times the nominal rope diameter.

NOTE 1 The width (h/2) of the eye with the rope under no load should be approximately half of  its length. see figure 3

In all other cases the rope end shall protrude by no more than one half of the rope diameter. In the case of ropes severed by a heat process the ferrule shall be positioned such that after pressing the rope end shall protrude from the ferrule by an amount no more than one rope diameter, i.e. only the annealed portion shall protrude.

Positioning of the ferrule before pressing shall ensure that the distance after pressing provides :

• clearance between thimble and ferrule
• the thimble is secured within the eye (secured against the possibility of rotation within the eye  or rolling out of the eye).

NOTE 2 Typically after pressing the clearance between the base of the thimble and the ferrule should be a approximately of 1,5 times the nominal rope diameter for a thimble without a point, and 1 times the nominal diameter for a thimble with a point unless specified otherwise by a competent person. See informative annex A for a specification of one design of turnback eye ferrule-secured termination

BROKEN WIRES

BRITISH STANDARD BS EN 13414-2:2003 (Steel wire rope slings —Safety — Part 2: Specification for information for use and maintenance to be provided by the manufacturer)

A.2.3.5.2 Randomly distributed broken wires

6 randomly distributed broken outer wires in a length of 6d but no more than 14 randomly distributed broken wires in a length of 30d where d is the nominal rope diameter.

A.2.3.5.3 Concentrated broken wires

3 adjacent broken outer wires in one strand.

A.2.3.6 Rope distortion

Kinking, crushing, birdcaging or core protrusion or other damage which distorts the rope structure.

NOTE: The main thing to look for is wires or strands that are pushed out of their original positions in the rope. Slightbends in a rope where wires or strands are still relative ly in their original positions would not be considered serious damage.

A.2.3.7 Rope wear

10% of the nominal rope diameter (d).

Baca Juga Kriteria Reject Wire Rope Sesuai Standard : API RP 2D

THIMBLES FOR ROPE SLINGS

BRITISH STANDARD BS EN 13411-1:2002 (Terminations for steel wire ropes — Safety — Part 1: Thimbles for steel wire rope slings)

Kriteria Reject 

1. Pengikisan parah yang terpusat
2. Perubahan bentuk seperti yang dijelaskan di slide tambang  sebelumnya
3. Kerusakan akibat panas
4. Ujung yang rusak
5. Korosi (berupa lubang-lubang kecil pada kawat atau kehilangan kelenturan pada kabel karena korosi yang terjadi di dalam)