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Center Axis of Elbows & Vertical Inline Pumps 1
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TravisMack
Mechanical
My understanding is that the orientation limits are only for Horizontal Split Case as well.
Travis Mack
MFP Design, LLC
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Travis Mack
MFP Design, LLC
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skdesigner
Mechanical
The key difference is that horizontal split case pumps utilize "double suction" impellers, where water enters the impeller from both sides of the eye. Vertical inline pumps use single-suction impellers, where water enters from only one side of the eye. For a horizontal split-case pump, water flows from the suction piping into the pump casing, splits evenly around the impeller and then flows into both sides.
When water flows through an elbow, the water travelling on the "outside" of the elbow has a longer distance to cover than water on the "inside". When the elbow is laid on the horizontal plane in close proximity to the pump suction flange, this creates an imbalance that is carried into the pump since the water is no longer flowing evenly into both sides of the impeller eye. The result is increased strain on the driveshaft and bearings, as well as the potential for cavitation.
To confuse you further, vertical split case fire pumps do actually exist.
R M Arsenault Engineering Inc.
When water flows through an elbow, the water travelling on the "outside" of the elbow has a longer distance to cover than water on the "inside". When the elbow is laid on the horizontal plane in close proximity to the pump suction flange, this creates an imbalance that is carried into the pump since the water is no longer flowing evenly into both sides of the impeller eye. The result is increased strain on the driveshaft and bearings, as well as the potential for cavitation.
To confuse you further, vertical split case fire pumps do actually exist.
R M Arsenault Engineering Inc.
TravisMack
Mechanical
Thanks SKD...that is actually an explanation that I can understand and makes sense.
Travis Mack
MFP Design, LLC
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Travis Mack
MFP Design, LLC
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skdesigner
Mechanical
Glad I could help Travis - love the facebook page!
R M Arsenault Engineering Inc.
R M Arsenault Engineering Inc.
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