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392 Centrifugal Pumps: Design and Application
an effective way of reducing the power loss of a flat sealing face by as
much as 30%. The hydropad design feature is shown in Figure 17-29. In
most applications this will permit the seal to operate in a very stable con-
dition with very low leakage to the atmosphere. Leakage rates from these
Figure 17-28B. Piping plans for mechanical seals from A.P. I. Standard 610,6th
Edition, (Reproduced courtesy American Petroleum Institute.)
