Quick Answer
Choosing the right thickness of tarred bankline depends on the intended use, such as securing loads on ships or as a climbing aid. Consider factors like load weight, usage frequency, and desired durability. A general guideline is to use a 3/8 inch (9.5mm) thickness for most applications.
Determining Load Capacity
When selecting a tarred bankline, it’s essential to consider the maximum load weight it will be subjected to. As a general rule, a 3/8 inch (9.5mm) thickness can withstand loads up to 1,000 pounds (453.59 kg) per inch of circumference. For example, a 1-inch (2.54 cm) diameter bankline with a 3/8 inch thickness can handle loads up to 1,000 pounds.
Tar Quantity and Application
The quality and quantity of tar applied to the bankline also play a significant role in determining its strength and durability. A minimum of 10% tar content is recommended, with a maximum of 20% for optimal performance. Apply the tar evenly, making sure to cover the entire surface of the bankline. Avoid over-tarred banklines, as this can lead to a brittle, prone-to- cracking finish.
Field Testing and Maintenance
While choosing the right thickness and tar quality is crucial, regular field testing and maintenance are also vital to ensure the bankline’s integrity. Inspect the bankline regularly for signs of wear, damage, or excessive tar buildup. Perform routine tests, such as the ‘finger test,’ to evaluate the bankline’s tensile strength. This involves grasping the bankline between the thumb and index finger and pulling in opposite directions to assess its resistance to stretching or breaking.
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