Axi MTC HC-300 Installation, Operating And Maintenance Manual Download Page 8

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System Operation

Operating Procedure

Hoses: The intake/suction hose is a reinforced vacuum hose. The return hose is black or blue/black, non-marking, high
quality, discharge fuel hose. Both hoses are equipped with quick disconnects or Cam & Groove couplings.
1. Attach quick disconnect end of suction hose to the quick disconnect Pre-Filter Inlet Port of the MTC.
2. We highly recommend attaching a “stinger” or pipe (cut at an angle at the end that goes into the tank and is at minimum

the same inner diameter as the suction hose) to the suction hose to reach the lowest part of the tank bottom.

3. Attach quick disconnect end of blue/black discharge hose to quick disconnect Pump Skid Discharge Port (before fine

filters) of the MTC.

4. Place the end of the discharge hose in an appropriate-size container (Phase One only). Try to not agitate the fuel in the

tank and stir up and disperse water and sediment throughout the fuel –this will make it more difficult to remove later on.

5. For Phases Two and Three, place the end of the discharge hose back in the tank as far away as possible from the

suction hose. Ensure that the hose is secured and will not vibrate out of the container when the system is operating.

6. Verify that drain valves are closed and the system is set up in a stable and safe position.

Note: Never restrict the flow on the suction side of an MTC; e.g. by using a smaller ID hose or pipe or attaching the suction
hose to a fitting on the tank that has a smaller ID than the hose. This will lead to excessive pump load, noise and ultimately
damage the pump.

AXI recommends 3 phases to successfully polish a fuel tank:
•  1. Bulk water and sludge removal
•  2. Pre-filtration
•  3. Final fuel polishing
This will ensure all water is removed from the fuel, particulate is removed, and the fuel is in an optimal condition. The goal
of Phase One is to remove any free water and sludge on the bottom of the tank without mixing the water into an emulsified
state within the fuel. Start the pump motor and be ready to immediately stop it. The vane pump will start pumping as long as
the system is primed and the suction lift is not excessive. The flow of fuel can be observed in the suction hose. Watch for a
steady flow of fuel into the container. Connect the Discharge Hose to the Pump Skid Discharge Port (before fine filters). It is
also recommended to install a small ball valve on the suction “stinger” to break the vacuum for draining.

Phase 1:

1. Connect a “stinger” to the tank end of the suction hose. The stinger is obtained locally and fashioned according to the

requirements of the particular job. In general, the “stinger” is a piece of PVC pipe cut at an angle to facilitate removal of
water and contaminants, when the “snorkel” is inserted into the fuel tank.

Note: Avoid restricting the flow on the suction side of the system. If it is necessary to use a smaller ID suction hose, a smaller
ID “stinger”, or if the length of the suction hose is increased, reduce pump speed with the Speed Control Dial so that the
vacuum gauge remains in the green color band. The system’s PLC controller will halt system operation automatically if the
suction vacuum exceeds safe limits.

Note: To adjust vacuum settings of MTC HC-300, please contact AXI International.