FLEX User Instruction – 21TEM14546 EN
Page 28 of 43
7 Maintenance
The FLEX does not require scheduled or preventative maintenance. As long as the device is
properly operated and flushed before extended shutdowns, the device is designed to operate
maintenance free for many years.
7.1 Maintenance procedure
Any work on the FLEX must be performed when it is at a standstill and de-energized state. It is
imperative that the procedure for shutting down the device is followed, as described in Chapter
6.
SHUT DOWN, DEPRESSURIZE, AND ISOLATE BEFORE PERFORMING MAINTENANCE
Ensure the system has been shut down and completely depressurized before disassembling any
connections to the FLEX units or system piping. Use valves to hydraulically isolate FLEX units from
the rest of the system and prevent accidental pressurization.
DO NOT APPROACH A HIGH-PRESSURE LEAK
Do not approach the FLEX equipment when a high-pressure leak has been detected. Shut
down and relieve pressure on the entire train before further inspecting or repairing any high-
pressure leaks.
Before working on the equipment, take measures to prevent an uncontrolled start.
• Put a warning board on the starting device with the words:
"Machine under repair: do not start"
• Use lockout tagout equipment on valves used to hydraulically isolate the FLEX units from
the rest of the system.
METAL OBJECTS CAN CHIP OR CRACK CERAMIC
Use caution when handling ceramic components to avoid damage.
7.2 Cleanliness
One of the major causes of FLEX failure is the presence of contaminants in the device. This
contamination can be in the form of dust, dirt, and other solid particles such as metal chips.
Contamination can be harmful to the ceramic components, especially the precise clearances
between the rotor, axle, and end covers. For this reason, it is very important that proper
cleanliness be maintained. Some guidelines are listed below.
• The work area should be clean and free from dust, dirt, debris, oil, grease, etc.
• Hands and gloves should be clean.
• Towels, rags, and tools should be clean.
• Covers should be used to prevent ingress of contaminants.
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