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7/27/2019 Oil-Free Screw Compressor 2
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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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;
Please Complete Review
https://tlshare.tamu.edu/sites/turbo/Lists/Case%20Study%2021%20Review%20Form/NewForm.aspx7/27/2019 Oil-Free Screw Compressor 2
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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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