HMPE slings are safety products; acceptance and inspection should follow objective criteria, not impressions. Below are the points to note in acceptance and inspection.
1. Receiving acceptance
- Label check — WLL, material, fitting grade, rated length, manufacturer, traceability code and standard number (ISO 18264:2022) all present; color follows the manufacturer's WLL coding (conventionally the roundsling colors).
- Dimensions — effective working length, eye size, etc. match the PO.
- Documentation complete — manufacturer's certificate of conformity, CE marking; for offshore projects, check MTC/MTR (material/test report) and third-party reports as required.
- No visible defects — cover free of holes and cuts; ends/stitching free of cracks; no unusual odour or signs of chemical contamination.
- Batch record — register the manufacturer, batch number and arrival date for later traceability.
2. Inspection before and after first use
Before the first lift, confirm the sling matches the lift points per the plan (construction, length, WLL); after use, do a visual check and record the initial state as a baseline. New HMPE slings should undergo a pre-tensioning (bedding-in) process before first use to stabilise length and stiffness[1][2].
3. Periodic in-service inspection
- Inspection frequency — for frequent or critical lifts, visual check before each use and a detailed inspection on a schedule (e.g. monthly or per project milestone) with records.
- Environment — salt spray, UV, high temperature and chemical environments shorten the inspection interval.
- Records — maintain a service log for each sling, recording the number of uses, loads, anomalies and how they were handled.
4. Discard criteria
If in-service inspection finds any of the following seven types of damage, act per the corresponding criterion:
| Inspection item | What to look for | Discard / take-out-of-service criterion |
|---|---|---|
| 1. Overload / shock | Whether an overload or shock load has occurred | Take out of service and evaluate if it has occurred |
| 2. Abrasion | Internal/external abrasion, fiber fuzzing, cover thinning | Discard if the cover is damaged exposing the core |
| 3. Cutting | Cut damage, sharp-edge damage | Discard if severe cuts reach the load-bearing fibers |
| 4. Strand pull-out | Strands pulled out of the splice | Discard immediately if found |
| 5. Splicing defects | Skipped stitches, loosening at the splice, eye deformation | Discard if splicing is defective |
| 6. Chemical / heat damage | Contact with strong oxidisers, concentrated acids, heat sources | Discard if burnt or corroded |
| 7. Fitting deformation & irreversible elongation | Thimble/shackle deformation; length noticeably longer after unloading (creep) | Discard if fittings are deformed or elongation is irreversible |
Core principle: retire a sling at the first sign of obvious damage; when in doubt, discard — the load is worth more than the sling.
5. FAQ
Can a sling still be used if the label is unreadable?
No. The label is the only evidence of WLL, material, batch and traceability. If the information is unclear or missing, take the sling out of service and ask the supplier to re-label or replace it.
Cutting damage vs service damage: how to tell?
In practice, artificially cut damage and service-ageing damage fail differently: cut damage tends to show a stepped fracture profile, while aged damage degrades gradually. For the field, remember one rule: whatever the cause, discard if the load-bearing fibers are reached or the cover exposes the core.
How often should inspection be done?
At least once a year by a competent person — that is the regulatory minimum. The monthly or per-milestone schedule in Section 3 is the project-level baseline and takes precedence when more frequent; shorten the interval further for harsh environments (offshore, salt spray, high temperature) or after a shock load.
Does inspection require professional qualification?
In-house staff can do routine visual checks; the annual inspection should be done by professionals or a qualified third party.
Further reading
- HMPE Slings: The Complete Procurement Guide for Offshore Projects
- HMPE Slings vs Steel Wire Rope vs Polyester: How to Choose for Offshore Lifting
- Why Owners Increasingly Specify HMPE in Lifting Plans
- Precautions for Procuring HMPE Slings
6. Technical notes
EN 1492-2 base materials do not include HMPE; HMPE-specific values follow ISO 18264:2022. This article is a procurement and maintenance overview and does not constitute a lifting design basis; actual parameters follow the rigging plan issued by the owner/EPC.
References
[1] Davies P. et al., Mechanical behaviour of HMPE and aramid fiber ropes for deep sea handling operations. Ocean Engineering 38 (2011).
[2] Lian Y. et al., Effects of bedding-in loading history on mechanical behaviors of aramid HMPE and polyester mooring ropes. Ocean Engineering 321 (2025).
[3] Background: Lian Y. et al., Experimental investigation on service safety and reliability of full-scale HMPE fiber slings for offshore lifting operations. Ocean Engineering 285 (2023).
* The source references cited in the body support the inspection guidance. Please note that literature-based guidance complements, but never replaces, the certification and rigging plan issued for your specific project.