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Type 93FR

Type 93FR
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Floating Ring Separation Seal A B C D E – Housing – Retainer – Clamp Plate – Garter Spring – Anti-rotation Pin F – Bushing Segment G – Sleeve Product Description The Type 93FR is a non-contacting carbon bushing designed to protect dry gas seals from bearing oil ingress. Segments are specifically designed to prevent oil migration. Separation gas (normally nitrogen or air) is injected between the two segmented bushings effectively creating a pressure barrier between the bearing and dry gas seal cavity. Advanced materials and design eliminate wear under normal running, promoting long service life. Size range: 1.57" to 14.76"/40 mm to 375 mm with sleeve to fit all metric or imperial shaft sizes Maximum separation gas operating differential pressure: 7.5 psi/0.5 bar Recommended separation gas operating differential pressure; 0.75 to 1.5 psi/0.05 to 0.1 bar Non-contacting for longer life and improved reliability; low heat generation Separation Gases: Nitrogen, Air Runs at low operating pressure differential enabling low gas consumption Specially designed segments further minimise gas consumption Universal design, independent of shaft rotation Will retrofit many traditional carbon bushing rings Suitable for running with nitrogen separation gas irrespective of dew point Self-centring design minimises wear even during upset conditions For alternative conditions, consult John Crane Engineering.

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TYPE 93FR Floating Ring Separation Seal Required Installation and P&ID for Type 93FR Separation Seal Seal Gas Inlet (Dry/Clean Process Gas) Primary Vent (To flare) Secondary Vent Buffer Gas Inlet Product Side Bearing Housing Typical arrangement with a Type 28XP Tandem Seal Separation gas can be pressure controlled (recommended, to minimise gas consumption) or flow controlled. Typical example shown, variations may be necessary depending on individual circumstances including availability and quality of separation gas and safety considerations.

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TYPE 93FR Floating Ring Separation Seal Type 93FR Consumption Rates 1000 Cold Static Consumption Hot Dynamic Consumption Consumption (scfm) Consumption (scfm) Consumption (sl/min) Consumption (sl/min) Cold Static Consumption Hot Dynamic Consumption Consumption (scfm) Consumption (scfm) Consumption (sl/min) Consumption (sl/min) Cold Static Consumption Hot Dynamic Consumption Consumption (scfm) Consumption (scfm) Consumption (sl/min) Consumption (sl/min) Seal Sleeve Diameter Shaded areas indicate expected consumption ranges for typical application conditions. Actual consumption is dependent...

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TYPE 93FR Floating Ring Separation Seal Materials of Construction SEAL COMPONENT DESCRIPTION STANDARD MATERIALS Bushing Segments Garter Spring Stainless Steel Housing Assembly Clamp Plate Assembly Alternative materials are available, consult John Crane Engineering. Separation Gas Specification: Filtration: 10 microns and dry. Proper consideration must be given as to the possibility of explosive mixtures. Operating Environment: Vibration levels within API 617. Bearing housing should be well drained. Bearing housing should not be pressurized. Consideration should be given to the secondary...

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