Petol BA118, Руководство по эксплуатации, Страница: 12 / 24

10
Operation
The typical application of one Bukup Tong is shown in the figure below. Normally backup
will be provided by an additional tong or by a vise. The backup tong or vise is not shown for
clarity. The tong will exert torque when the line is pulled as shown below. The tong will
ratchet when the tong is moved in the opposite direction. Ratcheting is used when the tong
must be pulled more than once to completely makeup or breakout the connection.
WARNING: The pipe must be constrained to prevent excessive deflection of the
pipe. Excessive deflection of the pipe could lead to side loading. Side loading will
result in premature failure of the tong and/or chain which may result in injury or
death.
WARNING: Do not actuate the tong with an overhead bridge crane unless the
crane is guarded from derailing. Sudden release of energy, such as when a
connection is broken loose, can cause an overhead bridge crane to spring upwards
resulting in the crane derailing. Derailing of an overhead crane may result in the
crane falling to the floor resulting in injury or death.