ABOUT STEEL WIRE ROPE (SWR)

 

Veltkamp delivers in particular steel cables for:

  • Under the Hook (UTH)
  • Cargo Securing

 

 

For lifting equipment from steel cable the following European are applied:

  • EN 13414-1 to 4 (DIN 3088)
  • EN 13411-2 (DIN 3089)
  • EN 13411-3 (DIN 3093 + DIN 3095)
  • EN 13411-4 (DIN 3092)
  • EN 13411-5 (DIN 1142)
  • EN 13411-6 (DIN 43148)
  • EN 13411-7 (DIN 15315)
  • EN 12385-1 to 4 (DIN 3051)
  • ISO 3108  (BGR 151)
  • EU Machine Directive (IIA declaration)

 

 

 

In addition, for the offshore are applicable:
  • EN 12079
  • DNV 2.7-1
  • NOGEPA
  • BS 7072

 

In the offshore also apply to chains and steel cables the IMO year colors:

 

Brown
 
2010 2016 2022
Blue
 
2011 2017 2023
Yellow
 
2012 2018 2024
Orange
 
2013 2019 2025
Black
 
2014 2020 2026
Green
 
2015 2021 etc.
         

IMO-year color are applicable to hoisting ropes and chains for the offshore, to see quickly see in what year a hoisting device is inspected.
At an inspection the chains or the identification tag or the master link will be painted in the rigth IMO-year colour.

 


Types of Steel Cable

  • bright steel cable
  • galvanized steel wire
  • stainless steel wire


Bright steel cable
For steel cables whose life is strongly influenced by wear and destruction than by corrosion. However, also the bare steel cable should be protected against corrosion, by feasing the cable on the right way.

Galvanized steel cable
For steel cables that must be corrosion resistant.

Stainless steel cable
For steel wire ropes that have to be highly resistant to corrosion and, moreover, must be heat resistant up to a temperature of 250 °C.

 

 

Cores

Rope Core (polypropylene):

  1. In case of bending the strands can move more easely around the rope core, without any risk of damaging or exhausting the single wires
  2. Between the core and strands are no wire crossings (torsion)

On the other hand:

  1. Cable with a rope core is susceptible to damage
  2. In case of heat the rope core will age and shrivel faster. It that case it becomes thinner after which one of the strands can fall inwards causing a disbalance between the strands (the "corkscrew")
  3. If the rope core wears out or shrivels quickly, the load is not devided equally divided amongst the strands

Steel Core:

  1. A permanent support and equal dissemination of the surrounding strands. He is not compressible and more abrasion resistant than a rope core
  2. The steel core supplies a permanen elasticity of the steel cable
  3. It offers more resistance to deformation and destruction
  4. The steel core prevents against corrosion, the grease will not squeezed out of the core
  5. The actual breaking load of a rope with a steel core is approximately 10% higher (at 6-strand cable) than a cable with rope core

 

Elongation

Constructive Elongation:
This occurs when the cable is being used for the first time. The stretching is permanent and the value depends on the cable construction, but is standard approximately 0.25 to 0,50%.

Elastic Elongation:
This is the elongation at load, which disappears when the load is removed.
The value of the elastic elongation depends on the cable construction and the percentage of loading, but is about 0.20 to 0.60% in normal conditions.

Plastic Elongation:
This occurs when the load exceeds the elastic limit and is permanent.
The elastic limit for bare steel cable is 55 to 60% of the breaking strength.


 

Required Order Information

At redelivery is the certificate number on the tag is sufficient.

For the supply of new cables is the following information is necessary:

  1. applicatiob, type of lifting device
  2. quantity and the length per cable (allowable length-tolerance)
  3. diameter or circumference
  4. construction of the steel cable
  5. core
  6. minimum tensile force of the cable
  7. tensile strength
  8. strike direction
  9. may or may not be pre-formed
  10. end connections
  11. finishing of the loops
  12. any specific greasing
  13. type of packaging
  14. shipping instructions