STEP 6. Freespan confirmation
(
)
S
P • l ’ –
+ R
K’ =
2 –––––––––––––– 2
S
F 0 = – + K ’ 2 S F 1 = – + K ’ 3 S F 2 = – + K ’ 4
Freespan without support roller
The values of F 0 , F 1 , andF 2 must not exceed the maximum freespan from the capability graph below. If it does, a larger chain size must be chosen or more support rollers added, but only up to a maximum of two.
Freespan with one support roller
Freespan with two support rollers
Capability Graph
How to use the capability graph For the TK095, if the weight of the cables or hoses is 4.03 lbs./ft., the moving strokes are:
With no support roller: The intersection of the cable weight axis (2.75 lbs./ft.) and the freespan length axis (26.25 ft.) at point A is within the range of TK095. Therefore, it can use a bending radius within 78.74 inches and satisfy the diameter of the cable or hose. With one support roller: The intersection at point B is within the range of TK070, but the allowable bending radius of cables or hoses is more than the allowable bending radius of the cableveyor. The diameter of the hoses or cables is bigger than that which is on the chart. Therefore, it does not satisfy the requirement.
25.6 ft. with no support roller 38.4 ft. with one support roller 51.2 ft. with two support rollers
There are five different bending radii of the chain standardized at 4.92, 5.71, 7.87, 9.84, 11.81 inches. Maximum hole diameter is 1.81 inches. Example Weight of the cables or hoses: 2.69 lbs./ft. Allowable bending radius of cables or hoses: 7.48 inches External diameter of the biggest cable or hose: 11.81 inches Moving stroke: 26.25 ft.
B-102
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