A simple method is described for computing the volumetric displacement of a tubular diaphragm on a mandrel, as used in a diaphragm separator pump, for any given pressure differential across it. The computer model involves a plane strain analysis and regards the diaphragm as a curved beam in bending, shear and tension. Comparison with experiment has shown the model to give accurate predictions of diaphragm behaviour.
The design of a diaphragm is discussed, making use of the computer model. Attention is given to the choice of wall thickness, elastic modulus and mandrel support and the manner in which they affect diaphragm life, the volumetric efficiency and operation of the pump.
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