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124 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Blocks Method of reeving tackle blocks will vary with the application. With heavy lifting systems where blocks with multiple sheaves are needed the number of blocks has to be determined. This is done for a given load that needs to be lifted, by calculating the number of parts of line as follows: L = load to be lifted in t P = single line pull in t R = ratio L R = P Example: L = 16 t P = 3 t How many parts of line are needed? L 16 R = = = 5.3 P 3 Refer to ratio 5.3 in table 2 or the next larger number nearest to it, and then check the column under the header “number of parts of line” For blocks with roller bearing sheaves this results in 6 parts of line that should be used to lift a 16 t load with a line pull of 3 t. Lifting with multiple line parts number of bronze roller parts bushed bearing of line sheaves sheaves  1 0.96 0.98  2 1.87 1.98  3 2.75 2.88  4 3.59 3.81  5 4.39 4.71  6 5.16 5.60  7 5.90 6.47  8 6.60 7.32  9 7.27 8.16 10 7.91 8.98 11 8.52 9.79 12 9.11 10.6 Table 2 2 parts of line 3 parts of line 4 parts of line 5 parts of line 6 parts of line