By Dean McDonald, founder, Crane Rope Solutions
Every case here comes from our own work with crane owners, inspectors and rope makers. Customer names are left out. Where a point came from a rope maker's engineers rather than from us, we say so.
Flattened crown wires on a hoist rope: discard or not?
Wear vs discard, an oversize rope, and re-terminating a high-grade compacted rope.
What a crane rope inspection report should include
The checklist we use, a worked severity example, and reference vs actual diameter.
Offshore luffing ropes lasting 2 to 4 months: what we found
Multi-layer drum wear, lubrication and slip-and-cut; rope life roughly doubled.
Crown break or valley break? Why it matters
How to tell them apart, and a worked ISO 4309 example on a 42 mm luffing rope.
Block spinning? Check the rigging and the sheaves before adding a swivel
Two twisting hoist ropes: one rigging error, one wrong-size sheave.
Why did our hoist rope only last 900 hours?
A bent dead-end clamp, a worn drum flange and a rough drum.
Waviness in a tower crane hoist rope: find the tight sheave
Waviness traced to the apex and jib heel sheaves, with a replacement priority list.
Measuring drum pitch and choosing rope tolerance
Measuring pitch over several wraps, the 0.5% clearance rule, and metric rope on an imperial drum.
Sheaves that don't fit the rope
A rebuilt sheave cut too small, and a stop-gap for worn port crane sheaves.
Damage at the dead end of a drilling rig rope: shorten or replace?
Loose wraps at the drum, shortening behind the damage, and a crowd sheave with negative imprints.
Fully compacted or partly compacted rotation-resistant hoist rope?
Counting breaks by RCN, and choosing between two rotation-resistant constructions.
Relubricating crane rope in the field
Lubricant grade, compatibility with the factory grease, and how often.
Surface rust or internal corrosion?
How to tell them apart, why photos aren't enough, and when MRT is worth it.
Crane rope questions from the field
Courses and standards, broken wire vs broken strand, lay direction, pendants and more.
Seeing something similar on your crane? Send us photos and the rope specification: dean@craneropesolutions.com or 604-813-9473.