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NONCONTACTING, LOWLEAKAGE SEALS

AUTHORS:JOHN JUSTAKCYRILLE DOUX

NOTE: REVIEW FORM LINK AT END OF THIS DOCUMENT!

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16500 rpm (female rotor)

Max. temp. 200 deg. C

Dischar e ressure 1 bar abs

Suction pressure 12 bar, abs

Rotor static deflection 0.00 Dynamic (1/rev) deflection 20000 hours

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Resonant Frequencies:

1st1488 Hz

nd

3rd 4088 Hz

4th 7829 Hz

Noncontacting

HydrostaticAdvancedLowleakage

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Seal

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labyrinth teeth mounted in soft radialsu ort to allow 0.00 radial movement.

Installed with 0.0075 radial clearance

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41 bar(discharge) sealbeam & pocket designs

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Based on Static rig Tests and Analysis

5shoe design @ 12 bar =10.2 scfm 12 bar Pocket

5pocket design @12 bar = 8.2 scfm

41 bar beam 41 mm eam 41 ar = 17 sc m

45 mm beam @ 41 bar = 12 scfm

1 r P ck 41 mm pocket @ 41 bar = 14.5 scfm

45 mm pocket @ 41 bar = 15 scfm

( poc et sea s an 41 ar sea s were insta e wit 0.0075 ra ia gap)

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Posttest Female/Male Discharge Seal

Dryfilm lubricant debris

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Noted: rustlike material residue in orifice feeds

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Seal shoes, Male/Female suction seal

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Seal Test objectives

. 2. Targeted leakages (meet predictions)

;

.

.4. Maintain low leakage thru endurance testing

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;

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Rerun 2 new sets of seals ,

seals in series (23) on the discharge side. Reduce installation gap from 0.004 gap to 0.001 gap &

suction leakage from 10 scfm to 7.

Pocket seals both suction and discharge Modif desi n to insure ocket ressure feed Decrease installation gap from 0.0075 to 0.0005, this will

reduce discharge seals from 15 scfm to 8 scfm and suction

seals from 8

10 scfm to 6 scfm. Silicon Oring temp limit is 230C (450F)

Replace problem orings with Kalrez is good to 324C (615F)

Remove material from seals to im rove heat conduction

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