Leakage Considerations

The Humidicore™ should not exhibit external leaks from the case. Should such leaks occur, the cause may be cut or worn “O” rings or loose fasteners. A small amount of shaft seal leakage may occur and is normal. However, excessive venting indicates a worn seal and will require a replacement seal and shaft re-surfacing.

The Humidicore™ internal face seals are designed to reduce the leakage from the fresh side to the exhaust side. Cross-over leakage in this mode consists of two components:

1. Crack flow – air leaking between the seal/core dynamic interface
2. Pump over – air carried over from the fresh side to the exhaust side in the volume of the rotating core

The crack flow component predominates, especially in the smaller wheels, but the pumpover component is noticeable in the 8 inch diameter units. It is a direct function of the core size, speed and pressure differential and can account for a third of total leakage.

The total cross-over leakage specifications for the various cartridge sizes are as follows, at 40 rpm and 3 psid (0.2 bar):

1. 4 inch diameter < 1.0 scfm (28 l/m)
2. 6 inch diameter < 1.5 scfm (42 l/m)
3. 8 inch diameter < 2.5 scfm (70 l/m)

The seal system is designed for a 5 psi (0.3 bar) differential.

Next: Installation Considerations

How Humidicore™ Works
Picking the Right Size
Cartridge Details
Manifold Design
Motor Options
Leakage Considerations
Installation Considerations
Field Service

Application Manual

Application Manual

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