Member of the Royal Lankhorst Euronete Group www.lankhorstropes.com The Payload Counts HEAVY LIFTING DIVISION
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Member of the Royal Lankhorst Euronete GroupMember of the Royal Lankhorst Euronete Group
www.lankhorstropes.comwww.lankhorstropes.com
The PayloadCounts
HEAVY LIFTING DIVISION
CO
NTA
CT
Lankhorst Ropes
Lankhorst Ropes is a member of the Royal Lankhorst Euronete Group. It has been a market leader for many decades in the introduction of new synthetic fi bres, starting with polyamide, polyester, polyethylene and polypropylene, later followed by HMPE, aramid and the in-house developed Tipto® range. Lankhorst focuses especially on specialized fi bre ropes and steelwire ropes, providing added value with respect to breaking strength, cost-of-ownership, safety and ease of handling. Lankhorst Ropes has been certifi ed according to ISO 9001 : 2000.
LANKHORST ROPESHEAVY LIFTING DIVISION P.O. Box 1039, 3300 BA Dordrecht, The NetherlandsMarconiweg 24, 3316 AM Dordrecht, The Netherlands Sales: +31 (0)78 6117 700Fax: +31 (0)78 6117 750 E-mail: [email protected]
Customised Heavy Lift Slings
As a specialist rope manufacturer, Lankhorst Ropes is able to produce customised slings for ‘Engineered Lifts’. These slings are designed to meet the loading and handling requirements for a specifi c lifting job involving repeated use, for example, a trial lift, lifting onto transportation to the quayside, from quayside onto the vessel, and from vessel deployment overboard.
Most Class Bureaux will certify lifting slings with Safety Factor 7:1 for general use. For an engineered lift, the safety factor will come down to 5, or even lower, if they are convinced of the dynamic factors engineered into the lifting project. Lankhorst can assist in detecting possible failure modes of the anticipated lifting confi guration.
HEAVY LIFTING DIVISIONH
EAV
Y L
IFTI
NG
DIV
ISO
N
Member of the Royal Lankhorst Euronete Group
www.lankhorstropes.com
a D
SM B
rand
Optimizing heavy lift payloads is made easier with heavy lifting slings from Lankhorst Ropes. A World Class, specialist rope manufacturer, Lankhorst brings over 200 years experience to engineering high performance, custom made ropes for lifting applications.
Synthetic ropes are lighter and as strong, if not stronger, than wire. This has signifi cant practical advantages over wire ropes: heavier loads can be handled as there is less weight in the lifting gear, enabling maximum payload lift. The lift is gentler, avoiding unnecessary damage to the load. Importantly, synthetic rope slings are designed for ease of manual handling and repeated use, enabling the whole lifting job to be done more safely and effi ciently.
From a handling perspective, the grommet has a smaller diameter compared to that of a single leg sling with the same MBF. Furthermore, when the grommet is placed over a pin or other contact point, the higher d/D ratio ensures a longer rope life. The grommet contact surface is larger than that for the single leg sling; a larger contact area with the same forces on the rope results in less contact pressure and, therefore, less yarn-on-yarn abrasion.
Maximising Heavy Lift Rope Sling Life
In order to maximise the rope sling life, twisting the sling ropes should be avoided at anytime. When placing the spliced eye over a pin or a crane hook, the d/D ratio is important. It should not be less than 2. The optimum d/D ratio is around 5. In addition, the slings should be visually checked before each lifting job, for:
• Diameter deviation• Abrasion• Inconsistent texture• Inconsistent stiffness• Glossy or glazed areas.
If any of these are detected, we recommend you do not use the sling, and request further inspection by qualifi ed engineers.
Heavy Lift Slings
Lankhorst Ropes’ heavy lift slings use LANKO®FORCE – a 12 strand plaited rope, made from Dyneema®, offering high levels of abrasion resistance as either a jacketed rope or an unjacketed coated rope. It is also stronger than conventional steel wire rope while the corresponding weight is 7 times lower.
LANKO®FORCE slings can be supplied as either a single leg sling or an endless loop rope sling:
• A single leg sling is made from a single rope with an eye splice at both ends. The splices can reduce the rope strength by up to 10% minimum breaking force (MBF).
• The endless rope sling comprises a double length splice formed into a loop, normally called a ‘grommet’. Although the appearance resembles that of a steel wire grommet, it is not the same. The loop rope sling MBF is the single rope MBF * 1.5; although in Lankhorst’s experience a factor of 1.7 is readily achievable. The grommet sling can also be tied together to form two eyes, providing an alternative approach to deploying the heavy lift sling.
Optimising Heavy Lift Sling Performance
Heavy Lift slings made from Dyneema® yarns have very little elasticity. At a loading of 20%, the elongation in the sling will be approximately 0.5%. If more stretch is required for the heavy lift, Lankhorst is able to offer slings made from other synthetic fi bre rope materials. All new synthetic ropes, including ropes made with Dyneema®, have some ‘construction elongation’, resulting in permanent elongation of the rope until it has bedded in. This can be up to 10% for LANKO®FORCE slings. In the event that a sling has to have a specifi c working length, Lankhorst is able to design the ropes accordingly. Depending on the length of the slings, they can be pre-stretched in a testbed. Otherwise, they are pre-stretched on-site to take out the construction elongation.
Recommendations
Working with heavy lift slings on board in a safe and effi cient manner, could require careful preparations in advance. Please consult with our salespeople. To preserve the full strength and safety of the slings on the job, Lankhorst recommends following practices. • On a single leg sling key parameters are:
• On a grommet sling, place the spliced area in one of the eyes. The elongation
properties of the spliced area are slightly different from the elongation proper-ties of the non-spliced area. If the splice is positioned in the lifting confi guration in one of the two legs, the two legs will not work together optimally.
• The pin or the crane hook where the sling is mounted, or any other contact points between sling and vessel or cargo, should be smooth. Rough surface will create friction and wear on the sling. A surface that has been exposed to steel wire rope may offer sharp edges which will cut into the synthetic fi bers of the sling. Loss of yarns in the sling, due to abrasion or cutting, will result in loss of strength.
Other recommendations could be important as well. The Lankhorst technical staff should study the lifting plan and advise accordingly.
THE PAYLOAD COUNTS!
LANKO®FORCE Single Leg Sling Grommet Sling
Ropediameter
(mm)
Ø 52 Ø 56Ø 60Ø 64Ø 68Ø 72Ø 80Ø 88Ø 96Ø 104Ø 112Ø 120Ø 128Ø 136
weight
(per meter)
1.49 1.762.022.32.542.93.584.35.166.957.989.1
10.3
weight
(per meter)
2.98 3.524.044.65.085.87.168.610.21213.915.9618.220.6
MBF *1
(kN)
1,9442,2412,5382,8893,2493,6094,0594,7885,6076,1207,0297,9838,9739,990
MBF *2
(kN)
3,2403,7354,2304,8155,4156,0156,7657,9809,345
10,20011,71513,30514,95516,650
For both types of slings, thimbles can be set into the eyes. Optionally, a protective sleeve can be applied to the main rope length and eyes.
*1 MBF has been calculated on a readily spliced single leg sling *2 MBF in grommet sling, with an applied grommet factor of 1.5.
A single line LANKO®FORCE sling showing both eye splices and a grommet sling (yellow).
0512
- Diameter (pin or crane hook) / diameter (rope) > 2- The angle between the two legs of the eye < 30°
HEAVY LIFTING DIVISION
HEA
VY
LIF
TIN
G D
IVIS
ON
Member of the Royal Lankhorst Euronete Group
www.lankhorstropes.com
a D
SM B
rand
Optimizing heavy lift payloads is made easier with heavy lifting slings from Lankhorst Ropes. A World Class, specialist rope manufacturer, Lankhorst brings over 200 years experience to engineering high performance, custom made ropes for lifting applications.
Synthetic ropes are lighter and as strong, if not stronger, than wire. This has signifi cant practical advantages over wire ropes: heavier loads can be handled as there is less weight in the lifting gear, enabling maximum payload lift. The lift is gentler, avoiding unnecessary damage to the load. Importantly, synthetic rope slings are designed for ease of manual handling and repeated use, enabling the whole lifting job to be done more safely and effi ciently.
From a handling perspective, the grommet has a smaller diameter compared to that of a single leg sling with the same MBF. Furthermore, when the grommet is placed over a pin or other contact point, the higher d/D ratio ensures a longer rope life. The grommet contact surface is larger than that for the single leg sling; a larger contact area with the same forces on the rope results in less contact pressure and, therefore, less yarn-on-yarn abrasion.
Maximising Heavy Lift Rope Sling Life
In order to maximise the rope sling life, twisting the sling ropes should be avoided at anytime. When placing the spliced eye over a pin or a crane hook, the d/D ratio is important. It should not be less than 2. The optimum d/D ratio is around 5. In addition, the slings should be visually checked before each lifting job, for:
• Diameter deviation• Abrasion• Inconsistent texture• Inconsistent stiffness• Glossy or glazed areas.
If any of these are detected, we recommend you do not use the sling, and request further inspection by qualifi ed engineers.
Heavy Lift Slings
Lankhorst Ropes’ heavy lift slings use LANKO®FORCE – a 12 strand plaited rope, made from Dyneema®, offering high levels of abrasion resistance as either a jacketed rope or an unjacketed coated rope. It is also stronger than conventional steel wire rope while the corresponding weight is 7 times lower.
LANKO®FORCE slings can be supplied as either a single leg sling or an endless loop rope sling:
• A single leg sling is made from a single rope with an eye splice at both ends. The splices can reduce the rope strength by up to 10% minimum breaking force (MBF).
• The endless rope sling comprises a double length splice formed into a loop, normally called a ‘grommet’. Although the appearance resembles that of a steel wire grommet, it is not the same. The loop rope sling MBF is the single rope MBF * 1.5; although in Lankhorst’s experience a factor of 1.7 is readily achievable. The grommet sling can also be tied together to form two eyes, providing an alternative approach to deploying the heavy lift sling.
Optimising Heavy Lift Sling Performance
Heavy Lift slings made from Dyneema® yarns have very little elasticity. At a loading of 20%, the elongation in the sling will be approximately 0.5%. If more stretch is required for the heavy lift, Lankhorst is able to offer slings made from other synthetic fi bre rope materials. All new synthetic ropes, including ropes made with Dyneema®, have some ‘construction elongation’, resulting in permanent elongation of the rope until it has bedded in. This can be up to 10% for LANKO®FORCE slings. In the event that a sling has to have a specifi c working length, Lankhorst is able to design the ropes accordingly. Depending on the length of the slings, they can be pre-stretched in a testbed. Otherwise, they are pre-stretched on-site to take out the construction elongation.
Recommendations
Working with heavy lift slings on board in a safe and effi cient manner, could require careful preparations in advance. Please consult with our salespeople. To preserve the full strength and safety of the slings on the job, Lankhorst recommends following practices. • On a single leg sling key parameters are:
• On a grommet sling, place the spliced area in one of the eyes. The elongation
properties of the spliced area are slightly different from the elongation proper-ties of the non-spliced area. If the splice is positioned in the lifting confi guration in one of the two legs, the two legs will not work together optimally.
• The pin or the crane hook where the sling is mounted, or any other contact points between sling and vessel or cargo, should be smooth. Rough surface will create friction and wear on the sling. A surface that has been exposed to steel wire rope may offer sharp edges which will cut into the synthetic fi bers of the sling. Loss of yarns in the sling, due to abrasion or cutting, will result in loss of strength.
Other recommendations could be important as well. The Lankhorst technical staff should study the lifting plan and advise accordingly.
THE PAYLOAD COUNTS!
LANKO®FORCE Single Leg Sling Grommet Sling
Ropediameter
(mm)
Ø 52 Ø 56Ø 60Ø 64Ø 68Ø 72Ø 80Ø 88Ø 96Ø 104Ø 112Ø 120Ø 128Ø 136
weight
(per meter)
1.49 1.762.022.32.542.93.584.35.166.957.989.1
10.3
weight
(per meter)
2.98 3.524.044.65.085.87.168.610.21213.915.9618.220.6
MBF *1
(kN)
1,9442,2412,5382,8893,2493,6094,0594,7885,6076,1207,0297,9838,9739,990
MBF *2
(kN)
3,2403,7354,2304,8155,4156,0156,7657,9809,345
10,20011,71513,30514,95516,650
For both types of slings, thimbles can be set into the eyes. Optionally, a protective sleeve can be applied to the main rope length and eyes.
*1 MBF has been calculated on a readily spliced single leg sling *2 MBF in grommet sling, with an applied grommet factor of 1.5.
A single line LANKO®FORCE sling showing both eye splices and a grommet sling (yellow).
0512
- Diameter (pin or crane hook) / diameter (rope) > 2- The angle between the two legs of the eye < 30°
Member of the Royal Lankhorst Euronete GroupMember of the Royal Lankhorst Euronete Group
www.lankhorstropes.comwww.lankhorstropes.com
The PayloadCounts
HEAVY LIFTING DIVISIONC
ON
TAC
T
Lankhorst Ropes
Lankhorst Ropes is a member of the Royal Lankhorst Euronete Group. It has been a market leader for many decades in the introduction of new synthetic fi bres, starting with polyamide, polyester, polyethylene and polypropylene, later followed by HMPE, aramid and the in-house developed Tipto® range. Lankhorst focuses especially on specialized fi bre ropes and steelwire ropes, providing added value with respect to breaking strength, cost-of-ownership, safety and ease of handling. Lankhorst Ropes has been certifi ed according to ISO 9001 : 2000.
LANKHORST ROPESHEAVY LIFTING DIVISION P.O. Box 1039, 3300 BA Dordrecht, The NetherlandsMarconiweg 24, 3316 AM Dordrecht, The Netherlands Sales: +31 (0)78 6117 700Fax: +31 (0)78 6117 750 E-mail: [email protected]
Customised Heavy Lift Slings
As a specialist rope manufacturer, Lankhorst Ropes is able to produce customised slings for ‘Engineered Lifts’. These slings are designed to meet the loading and handling requirements for a specifi c lifting job involving repeated use, for example, a trial lift, lifting onto transportation to the quayside, from quayside onto the vessel, and from vessel deployment overboard.
Most Class Bureaux will certify lifting slings with Safety Factor 7:1 for general use. For an engineered lift, the safety factor will come down to 5, or even lower, if they are convinced of the dynamic factors engineered into the lifting project. Lankhorst can assist in detecting possible failure modes of the anticipated lifting confi guration.
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