| S0000473 | January 2022 rev6
© Pandrol 2022
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4.4.10 HFP Operation
Monitor the HFP for the time required during preheating, you can also use this time to prepare the crucible and the
portion. The noise of the turbine and the HFP provides information on its operating state; monitoring this operating
parameter requires staying in the immediate vicinity.
If the HFP does not start or does not create a flame, refer to the malfunctions table.
In the event that the problem arises from a fault in the high voltage generator generating the spark, the HFP can be
ignited with a bell igniter.
Start the cycle, position yourself with your back to the wind, reach out and activate the igniter over a pipe. Do not
position yourself above the moulds, this will avoid any risk of burns when the flame emerges. This operation must
be carried out during the first 20 seconds of the cycle, before the maximum speed is reached. After 20 seconds,
switch off the HFP and start again.
4.4.11 Stopping and removing the HFP
When the required operating time has elapsed, the HFP will shut down on its own.
Close the gas supply valve on the cylinder.
Return the main switch to position O,
The following operations are carried out on very hot parts and objects, sources of risk of serious burns.
Wearing personal protection against the risk of burns and the use of handling tools are required.
Carefully remove the HFP, along with the gas hose and the electric cable from its support, taking care not to
damage the internal walls of the moulds.
Carefully place the HFP in a safe area away from the casting operation, taking care not to touch the torch nose, or
to place it near or against anything flammable. Take care not to bang the nose as this can result in damage to it.
Loosen the thumbscrew on the rail of the HFP support and remove it.
Resume the aluminothermic welding procedure, by the casting operation, which must very quickly follow the
preheating phase.
