Rule of thumb for cargo above 10 MT

The total MSL values of the securing devices on each side (Port or Starboard) should be equal or exceed the weight of the unit. Basically, MSL of lashings should be considered according to determination of MSL The total of the MSL values in tons of the securing devices on each side of a unit of cargo (port as well as starboard) should equal the weight of the unit in tons.

NOTE: The rule of thumb for cargo above 10 MT, is not valid for Top-over lashing.

The following criteria should be adhered to:

1. Good friction between the contact surfaces. (At least one of the surfaces should consist of rubber or wood).
2. Lashings working together should be of about equal length.
3. For units that are not rigid in form or that have a high center of gravity, the number of lashings should be increased.
4. Lashing should always be done to the satisfaction of the vessels Master.

Example:

Unit weight = 40MT

MSL for Chain lashings 7,5 MT

Unit Weight/MSL = 40/7,5 = 5,333 = 6 chains on each side of the unit, a total of 12 chain lashings to be used.