OAR 437-007-0655: Guylines — Tail Tree Guying

(1) Except as provided for in rule (2) and (5) of this section, a minimum of two guylines must be used on tail trees and located within guying zones to oppose the forces as shown in Figure 7-16 (azimuths 130-150 and 210-230 degrees). Figure 7-16 — Guylines — Tail Trees (2) When the angle of the lines between the tail tree and a tail hold produces an offset of more than 8 degrees between the lines as they enter and leave the tail tree, then at least three guylines are required. (3) If a suitable anchor is not available within a specified guying zone, two guylines may be used in lieu of one guyline for that zone, provided a guyline is placed on both sides of, and as near as possible, to the affected guying zone. (4) When additional guylines are needed in a tree, they must be placed to oppose the yarding forces. (5) Guylines are not required when at the point of rigging attachment the tail tree does not move more than its diameter in the direction of load as shown in Figure 7-18 and the: (a) Tail tree is not within reach of workers. (b) Resulting line movement would not pose a hazard to workers if the tail tree failed. [ED. NOTE: Figures referenced are available from the agency.]