Productivity and Cost of Integrated Harvesting of Wood Chips and Sawlogs in Stand Conversion Operations
Table 3
Harvesting system productivity and costs in the integrated harvesting system.
Process
Cycle time
Production rate
Machine rate
Joint products cost ($/BDTa)
(minutes)
(BDTa/PMHb)
($/PMHb)c
(sawlogs)
(biomass)
Felling/bunching
0.52
44.69
188.24
0.84
3.37
Shoveling
0.62
99.13
176.47
0.36
1.42
Loading
8.08
73.42
176.47
0.48
1.92
Hauling
32.50
36.51
211.76
1.16
4.64
Unloading
3.46
171.36
130.62
0.15
0.61
Sorting
0.66
71.29
138.36
0.39
1.55
Chipping
0.44
47.18
468.78
0.00
9.94
Loading (biomass)
5.84
132.36
121.48
0.00
0.92
Loading (sawlogs)
9.22
147.67
130.62
0.88
0.00
Hauling (biomass)
43.87
35.26
193.96
0.00
5.50
Total
1936.76
4.26
29.87
aBDT: bone dry metric ton.
bPMH: productive machine hours.
c$/PMH: machine rates were calculated using the assumptions of 33% fringe benefits, 10% interest, and 2% insurance.
