After doing a lot of searching, when people fail to find it they search it online. Direct tension symbolĬalculation of necessary tension force for load restraint with top-over lashing at View more.Finding a Harbor Breeze ceiling fan manual is an irritating task if you have lost the manual or it is not available in the same box when you purchased the fan from the company. To calculate the number of straps required, information about the strap itself and the load is required. STF Example: mGVM 20.000 kg, friction coefficient µ = 0.25, load weight 4000 kg, restraint in direction of travel, over-lashing at 90° angle, standard tension force STF = 500 daN: FT = 4000.(cX,Y - µ) Standard tension force FT = - µ Calculation for number of straps required: FT Number of straps = - 2.Simple calculation of necessary tension force for load securing with top-over-lashing at a 90° angle: FZ The strap can be used as long as it does not show signs of the potential damages listed. Potential damage which can occur to the strap can be taken from the label. In addition to practical instructions, indications of the need to replace components can be found.
The load is balanced, meaning the load can not slide if the following applies: Sum FF > FX, with sum FF = (FZ + FT) To achieve this 500 daN standard tension force (STF) in the ratchet, a manual force (SHF) of 50 daN has to be applied.įriction force FF can be increased for example by top-over lashing. A standard tension force STF of 500 daN is displayed on the label of the „Ergo long-lever ratchet strap“. This information can be found on the label. The standard tension force, not the lashing capacity of the strap, is relevant for the calculation of the number of straps needed! To calculate the number of straps required, information about the strap itself and the load is required. The symbols, units and terms used are in compliance with DIN EN 12195: FX,Y = Mass force of load towards the front, back and sides Fz = Weight (normal force) FT = Tension force lashing device FF = Friction force cX,Y = Front, rear or lateral acceleration µ = Friction coefficient sin α = Angle STF = Standard tension force lashing strap mGVM = Gross vehicle mass With stable loads this should be increased until the load is no longer able to slide, taking accelerating factors into account. The friction force can be increased with top-over-lashing or equipment that increases friction (e.g. ■ ■ ■ Load restraint using force locking The friction coefficient between load and vehicle floor surface can be increased with force locking.
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