The core of a round sling can be covered by an inner signal warning sleeve. This is a red Dyneema® or orange high tenacity Polyester sleeve which serves the purpose of indicating when a sling is damaged. When the inner signal warning sleeve is visible, the jacket has been damaged already and the sling can not be used any further. This way, the core of the round sling is still usable and only the jacket needs to be repaired or replaced.
Inner sleeves
Inner signal warning sleeve
Dyneema® inner signal warning sleeve
Dyneema® is extremely resistant to cuts, abrasion and puncture. Even when the outer jacket is damaged, a Dyneema® inner signal warning sleeve will protect the core of the roundsling. A Dyneema® inner signal warning sleeve will be provided in the color red, to make sure it stands out and is directly noticeable.
Dyneema® properties:
- Resistance against cuts, abrasion and puncture
- Service temperature range from -50°C up to +70°C
- Extremely resistant to UV
- Excellent on (sea)water and moisture
- Good resistance against acids and alkali
Dyneema® advantages:
- Extremely durable and stretchable
- No damage to payload
- Proven track-record in many industries/applications
- Chemical resistant
- Extremely resistant to cuts, abrasion and puncture
Polyester inner signal warning sleeve
A polyester inner signal warning sleeve is less resistant to cuts, abrasion and puncture than Dyneema®. The polyester sleeve will be provided in orange.
Polyester:
- Abrasion resistant
- Service temperature range from -40°C up to +100°C
- D:d ratio approx. 1:2 with small WLL & 1:3 with high WLL
- Elongation at WLL < 3 until 5%
- Elongation at break ≈ 8 until 10%
- Takes up water
Sand ingress protection filter
Extreema® heavy lift round slings are a perfect fit for subsea applications. They are high salt- and chemical resistant and do not absorb water. However, there are challenges when using your Extreema® round sling for subsea applications. Penetration of particles can lead to internal abrasion in the bearing core yarn. In this case it is recommended to use our Extreema® sand ingress protection filter as inner sleeve for your Extreema® round sling.
The filter can have as small characteristic opening size of O90 < 0,036mm, resulting as a good filter, and on the other hand allowing free flooding of the sling.
