The Gap between the Archimedes Screw Pump flights and the Archimedean Screw Pump trough

The Archimedes screw, suspended between the upper and lower bearing, is rotating above the trough with a minimal gap of only a few millimetres between the flights and the trough.

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The Gap

The screw, suspended between the upper and lower bearing, is rotating above the trough with a minimal gap of only a few millimetres between the flights and the trough. Some water will flow back through this gap, however this is marginal as long as the gap remains within allowable limits. The smaller the gap, the better the pump efficiency.

On the other hand the gap must allow for some deflection of the pump body! The optimum gap depends on the size of the pump (a large pump requires a larger gap) but is always in between 4 and 8 mm. In order to maintain an even and accurate gap along the total length of the screw it is important that the deflection of the screw pump is kept to a minimum.

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