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Monday, November 23, 2009

Solid and Split Casings

Solid casing implies a design in which the discharge water ways leading to the discharge nozzle are all contain in one casting or fabricated piece. The casing must have one side open so that the impeller can be introduced into it. Because the sidewall surrounding the impeller are actually part of the casing, a solid casing, strictly speaking cannot be used, and design normally called solid casing are really radially Splits.

A split casing is made of two or more parts fastened together. The term horizontally split had regularly been used to describe pumps with casing divided by a horizontal plane through the shaft centerline or axis. The term axially split is now preferred, because both the suction and discharge nozzle are usually in the same half of the casing, the other half may be removed for inspection of the interior without disturbing the bearing or the piping. Like its counterpart horizontally split, the term vertically split is poor terminology. It refers to a casing split in a plane perpendicular to the axis of rotation. The term radially split are now preferred.

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