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Diaphragm Failure #2 - What Has Caused This Issue??
As far as diaphragm failures are concerned, there are a number of failure types. Different types of failures are caused by different problems.
Regarding the diaphragm rupture in the photo above, what has caused this problem?
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Answer: Abrasion
On the liquid side of the diaphragm, one will notice an abrasion ring worn where the diaphragm meets its outer disk. Life of the diaphragms will dictate whether the abrasion is excessive; as some wear is normal. The pumps are rated to 40% by weight solids, however when this is exceeded or when solids are particularly sharp (e.g. Silica Slurry) this type of failure is more common. Maintaining a good flushing system, paying attention to the % solids, using an abrasion pads and/or slowing down fluid velocities will help. Note: if a diaphragm is torn dramatically along the bottom side and one experiences bending of the center shafts this is definitely a solids settling issue and should be addressed accordingly.
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