Please click the question to reveal the answer.
+ IS THIS NOT JUST TWO BOLLARDS PULLING AGAINST EACH OTHER?
Yes. What does a ship do? The equipment cannot pull outwards away from the quay edge. The custom designed dyneema can be attached to a bollard in a way that creates a turning moment, similar to some of the angles experienced from a ship. The dyneema can be elevated up to an angle of 20 degrees and further, but becomes not practical; all be it, can be custom designed.
+ CAN THE BLT SIMULATE ALL ANGLES OF PULL FROM A VESSEL?
No. The BLT pulls in both directions parallel to the quay. It also can pull at vertical angle of up to 20 degrees, thus readily simulating vessel spring lines, providing a great deal of confidence in both the mooring bollards and their surrounding structures.
+ ARE THERE ANY REACTION FORCES AROUND THE BOLLARD CAUSED BY THE BLT?
No. There are no reaction forces in the quay; it is a true test of a mooring line attached to a bollard.
+ WHAT HAPPENS IF A BOLLARD BREAKS DURING THE TEST OR DAMAGES THE SURROUNDING STRUCTURE?
Welcome it – far better to have a bollard failure during a test rather than in a real life situation resulting in multiple thousands of pounds worth of damage, or millions of pounds in law suits due to injury or death – which consequence would you prefer?
+ HOW IS THE LOAD APPLIED DURING A BOLLARD LOAD TEST?
By using a hydraulic cylinder, and gradually increasing pressure in 4 stages:
- 25 percent hold
- 50 percent hold
- 75 percent hold
- 100 percent hold
+ WHAT IS MEASURED OR RECORDED?
Hydraulic pressure converted into tonnes. Load, deflection of bollard and quay; deflection of bollard hold down bolts and other such as surrounding structure.
+ WHAT IS THE MAXIMUM LOAD THAT YOU CAN APPLY?
Currently up to 120 tonne with plans underway for up to 200 tonne plus.
+ HOW IS A TEST DEEMED TO BE SUCCESSFUL?
When the bollard successfully holds a static load.
+ WHAT DETERMINES BOLLARD LOAD TEST FAILURE?
Catastrophic failure – the bollard is separated from the quay, surrounding structure cracks or fixing bolts snap Or if load indicator does not hold a steady load and is steadily dropping this would determine that there may be potential movement in the bollard and structure surrounding it.
+ TO WHAT STANDARD ARE THESE CALCULATIONS TO BE PERFORMED
DNV recommend 20 percent over safe working load, however in reality this is up to a clients discretion e.g why overstress an old bollard quay structure.
+ WHAT WARRANTY OR OTHER STANDARD IS OFFERED IN REGARD TO TEST THE PROCEDURE?
The Bollard is certified for that load for that day. There cannot be a guarantee of how that bollard will be used in future. A test certificate is validated for a minimum of 12 months as OEM working method.
+ WHAT SIZE IS THE RIG AND HOW MUCH WEIGHT?
A basic unit is approx 1.1 tonne 1.6 mtr long (retracted) 1 mtr wide 600 high. There are variations depending on size of rig required.
+ WHAT IS THE DELIVERY TIME?
2 to 3 months.
+ WHAT ARE THE VARIATIONS OF BLT EQUIPMENT AVAILABLE?
Testing up to 120 tonnes. Testing up to 200 tonnes – machine under development. A collar type BLT purely to test fixings and bollards in any direction; although does not test quay infrastructure is currently in design and being tested at present.
+ HOW MANY BOLLARD LOAD TESTS CAN BE CARRIED OUT PER DAY?
Once equipment is set up 15 – 18.
+ HOW LONG DOES IT TAKE TO CARRY OUT A BOLLARD LOAD TEST?
Approx 30 minutes for standard test.