Butt Fusion Procedure
3 - 9
Determine Drag Pressure
Drag pressure should be determined using the following
procedure:
Move the carriage so that the faced pipe ends are
approximately 1" apart.
Shift the carriage control valve to the middle (neutral) position.
Select the heating mode, and adjust the middle pressure
reducing valve to its lowest pressure by turning the valve
completely counterclockwise.
Shift the carriage control valve to the left.
Gradually increase the pressure by turning the valve clockwise.
Increase the pressure until the carriage moves.
Quickly reduce the heating pressure valve counterclockwise
until the carriage is just barely moving.
Record this actual drag pressure.
TX03023-8-19-09
Check for Slippage
Bring the pipe ends together under fusion pressure to check for
slippage. If slippage occurs, return to Loading Pipe into Machine.
TX00971-5-31-96
Calculate Fusion Pressure
With the selector valve in the down position, the fusion pressure
can be set.
The theoretical fusion pressure can be calculated using the
enclosed fusion pressure calculator. Always add drag pressure to
the theoretical fusion pressure.
Gauge (Fusion) Pressure = Theoretical Fusion Pressure + Drag
Pressure
TX03024-8-19-09
PH04128-4-12-10 PH04004-8-25-09
PH04140-4-12-10
A - Carriage Control Valve
B - Pressure Gauge
C - Pressure Selector Valve
D - Pressure Reducing Valves (3)
C
B
A
D
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