OPERATION MAINTENANCE MANUAL
| Issue 06 | 1st February 2019
© Pandrol 2019
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1.1 Recommendations when using the Digital Gas Box
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The two taps of the Gas Box must be closed
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Turn the cylinders on and adjust the regulators to the following pressures – Propane 1.5 bar / Oxygen 2.5 bar
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Turn the Gas Box flow gauges on and ensure that the pressure unit is displayed as “custom”
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Light the preheater by gradually increasing the Propane and Oxygen flow on the Gas Box. Adjust the Propane
pressure between 0.25 bar and 0.30 bar. The Oxygen pressure is to be adjusted to 0.50 bar (between 0.50bar
and 0.51bar) on the Gas Box gauges.
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Ensure that the cone length measures 20mm.
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If you fail to achieve the 20 mm cone length, adjust the Propane tap to obtain the correct cone length (20mm).
Never modify the Oxygen pressure outside the parameters given.
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Place the torch support onto the centre of the moulds as shown in figure 3. Tighten the thumb screw to secure
the support to the moulds. Ensure that the support is sitting centrally within the moulds. It is essential that the
pressures are checked and maintained throughout the duration of the preheat.
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The flame that comes out of the risers during the preheat must be symmetrical and measure approximately 300
– 400 mm above the moulds.
Figure 4:
