boom is at zero degrees or adjusted to read zerodegrees. Measure the radius to avoid anypossibility of error. Take the 48,800 pounds andmultiply it by 110 percent (48,800 x 110% or 1.10 =53,680). The test weight for this crane example is53,680 pounds. After the test weight is figured,you must remember that the hook blocks andrigging gear are weight that are part of the testweight.The number of parts of line rigged on the craneis important (fig. 3-13). Most load charts will havethe rated capacity of the crane for different partsof the line; for example, a crane that is capable ofbeing rigged with a eight-part line is rigged with asix-part line. Check the load chart for the six-partline capacity; take that rated capacity andmultiply it by 110 percent. The answer will beyour test weight.Another weight to figure is the weight for thestability test. The stability test requires that themaximum test load be lifted first at the maximumradius and then be swung through eachmanufacturer’s recommended quadrant ofoperation for the crane, which is normally over theside and rear. Using the load chart (fig. 3-11) withthe crane assembled with 60 feet of boom, themaximum radius is 55 feet. Note on the load charta rated capacity for over the rear and over theside. Since the weight has to be transferred fromone quadrant to the other as part of the testprocedure, use the recommended capacity for overthe side. You will find on some load charts therated capacity will be the same for over the sideand rear. The rated capacity for this example is8,400 pounds. Multiply the 8,400 by 110 percent(1.10). (8,400 X 1.10 = 9,240.) In this case, thestability test weight is 9,240 pounds. After the testweight is figured, you must remember that thehook blocks and rigging gear are weight that arepart of the test weight.A third test weight to compute is the testweight for the auxiliary line, commonly knownas the whip line. This test weight is computedby the maximum load capacity for the winchhoist or the safe working load (SWL) of thewire rope installed on the winch. You mustremember that when the winch capacity isFigure 3-13.—Eight-part line hook block.3-14
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business