MTS 85X Damper - Manual (Page 51)

Damper System Operation Decommission 51
Decommission
The decommissioning process is performed when the system is going to be
moved or taken out of service. Disassembly is required when performing either
of these tasks.
1. Remove specimen(s) and fixtures. Large grips should be removed if the load
frame is going to be tipped over.
2. Move the actuator piston rod down to its lowest position, fully into that
cushion.
3. If the unit has hydraulic lifts move the crosshead to its lowest position and
torque the manual crosshead locking bolts. However, if the unit is going to
be moved, the crosshead might need to be locked at a higher position to
accommodate moving the unit.
If the unit has manual locks select a crosshead position that will
accommodate moving the unit and torque the manual locking bolts.
4. If there are hydraulic grips on the unit, ensure that the hydraulic pressure is
relieved from the grip and release ports and hoses on both grips.
On large grips, position the wedge chambers to the lowest positions, similar
to the unit’s piston rod as noted above.
If the unit has a remote 685 grip supply, cycle the grip/release handles while
reducing the pressure setting to release all pressure from the grips and hoses.
Turn off the 685 grip control and disconnect electrical power. Remove the
hoses.
If the unit has an integrated grip control (318 and Landmark) on the frame
control panel move the grip/release handle to the null position and release
the pressure using the pressure release valves on the grip manifold under the
control panel.
5. Turn off the HSM.
6. Turn off the HPU or shut off valves if the unit is connected to a hard line
distribution system. Allow time for pressure to bleed off before closing the
return shut off valve.
7. Remove the accumulator charging pressure from all accumulators.
8. Hydraulic locks can retain stored pressure. Manually bleed them if the unit
is going to be stored or disassembled.
9. Isolate the system hydraulically.
To isolate the system from hydraulic power requires that the hydraulic
supply valve or control is closed. Depending on your system’s
configuration, there is either a manual valve that must be moved to its Off
position or an electronically controlled supply valve that must be turned off.
Electronically controlled valves are either turned off using local controls or
the system software interface controls.