FLEX User Instruction – 21TEM14546 EN
Page 24 of 43
6 Operation
6.1 Commissioning
Prior to starting the FLEX system, it is essential that the following checks be made.
1. FLEX unit properly secured to the mounting bracket
2. All fasteners tightened to the correct torque
3. Pipe couplings with appropriate pressure rating in place and properly tightened
4. FLEX unit orientation matches system piping (HP/LP and in/out connections)
5. Piping is completely flooded and vented
USE APPROPRIATELY RATED COUPLINGS ON HIGH-PRESSURE CONNECTIONS
Pipe couplings with pressure ratings above the highest expected system pressure must be used
on high-pressure connections to the device.
6.2 Start-up
1. Partially close the backpressure regulating valve on the low-pressure discharge from the
FLEX system.
2. Ensure the FLEX unit and system piping is fully vented and flooded.
3. Start the low-pressure feed pump.
4. Slowly adjust the backpressure valve and the feed pump speed until the desired flow
and backpressure is reached.
5. Start the high-pressure booster pump to begin flow through the high-pressure line of the
FLEX.
6. Start the high-pressure feed pump to bring the high-pressure system up to the desired
operating pressure.
7. Adjust the high-pressure booster pump speed, low-pressure feed pump speed, and
backpressure valve position until the desired flow rates and backpressure are reached.
8. The FLEX should be spinning at this point. An optical tachometer can be used to look
through the sight-glass on each unit to confirm the rotor speed.
9. Check that no leaks exist from the pipe connections or the FLEX.
Keep in mind the minimum required backpressure and maximum flow rating (section 11.3).
NEVER ISOLATE LOW-PRESSURE LINE WHEN FLEX IS OPERATING OR PRESSURIZED
Never fully close the low-pressure inlet and outlet valves to the FLEX while it is operating or under
pressure. This can cause a dangerous build-up of pressure in the low-pressure system piping due
to internal leakage in the FLEX device. Appropriate pressure relief devices should be installed to
prevent damage to equipment or injury to personnel in this situation.
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