Cooling blow-moulded fuel tanks

June 2005 Maintenance, Test & Measurement, Calibration

Car fuel tanks are blow-moulded, then clamped to a fixture to prevent distortion during the cooling cycle. The problem is that the cooling time of each tank creates a bottleneck in the production process.

Two EXAIR model 3250 vortex tubes were mounted to the cooling rack and connected to a compressed air line. Cold air produced by the vortex tubes was circulated inside the fuel tanks. Cooling time was reduced from three minutes to two minutes for each tank, improving productivity by 33%.

The vortex tubes' small size and light weight simplified mounting to the cooling rack. No moving parts assured reliability and maintenance free operation in a hostile environment. The cold air stream was easily channelled to the fuel tank via the threaded cold air outlet. When the cooling problem includes the need for simplicity, reliability and compact design, the EXAIR vortex tube is often a suitable choice.

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