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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
THE SODIUM HEAT-PIPE FURNACE, MODEL 17705
FINAL PART OF THE COMMISSIONING INSTRUCTIONS
The initial slow temperature ramp is maintained until the temperature reaches 450°C. Impose a heat-pipe set-point
of 500°C and set the over-temperature controller to 550°C. Allow 1 to 2 hours for the furnace to stabilise and then
reduce the over-temperature cut-out setting until the relay trips and thus switching off the furnace.
Allow the furnace to cool and isolate it from the electricity supply.
At the rear are two water connections; these should be connected to a controllable supply and a flow of 1 to 2 litres
of water per minute established - this prevents the top of the cabinet being overheated at high furnace temperatures.
Run the water for 1 hour to check the furnace for absence of leaks (the floor underneath the cabinet should be
inspected).
The 17705 furnace is now ready for use.
N.B. The sodium heat-pipe incorporated in Model 17705 has a life of about 1000 hours at 1100°C, limited by the
Inconel containment.
It should endure operation for at least 10,000 hours at 1000°C.
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