August 2014

Special Report: Fluid Flow and Rotating Equipment

Update on secondary seals for fluid machines

Elastomer-based O-rings are used as secondary sealing components in millions of fluid machines. Although O-ring seals are primarily intended for fluid containment between different but nonrotating com..

Bloch, H. P., Hydrocarbon Processing Staff; Carmody, C., AESSEAL plc

Elastomer-based O-rings are used as secondary sealing components in millions of fluid machines. Although O-ring seals are primarily intended for fluid containment between different but nonrotating components, there are also many other applications where “flying O-rings” are performing needed duties, ranging from fluid shut-off to making the rotor and stator into a nonseparable assembly. The unusual term “flying O-ring” implies that this flexing component can expand and contract, while an adjacent machine element either remains stationary or is rotating. Design benefits Interesting examples of flying O-rings are illustrated in Fig. 1. This figure shows the design princip

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