| BMP ID: |
7477 |
| Title: |
Reduce Emissions with Dry Seals |
| Text: |
Dry seal springs press the stationary ring in the seal housing against the rotating ring when the compressor is not rotating. At high rotation speed, gas is pumped between the seal rings creating a high pressure barrier to leakage. Only a very small amount of gas escapes through the gap. |
| Source Publication Name: |
Methane Savings from Compressors and VRUs |
| Citation Section: |
Recommended Technologies and Practices |
| Citation Page: |
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| Supplemental Documents: |
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| Usage Type: |
Recommended |
| Timing: |
• Production / Operation / Maintenance
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| Oil / Gas Field: |
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| Surface Ownership: |
• Federal
• State
• Private
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| Mineral Ownership: |
• Federal
• State
• Private
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| Primary Contact: |
Environmental Protection Agency
Ariel Rios Building, 1200 Pennsylvania Avenue, N.W.
Washington, DC 20460 United States |
| Phone: | (202) 272-0167 |
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Alt. Phone: | (202) 272-0165 |
| Fax: | |
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E-mail: | |
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| Alternate Contact: |
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| Categories: |
Air Quality and Emissions
|
| Location: |
Unspecified |
| Species: |
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| Vegetation Types: |
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| General Comments: |
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| Cost-Benefit Analysis: |
A set of rings: $ 675 to $ 1,100 (with cups and case) $ 2,100 to $ 3,400
Rods: $ 2,500 to $13,500
Special coatings such as ceramic, tungsten carbide, or chromium can increase rod costs. Gas savings translate to approximately $112,000to $651,000 at $7/Mcf
Replacing wet seals in a 6 inch shaft beam compressor operating 8,000 hr/yr
Net Present Value = $1,216,100
Assuming a 10% discount over 5 years
Internal Rate of Return = 171%
Payback Period = 7 months
Ranges from 4 to 15 months based on wet seal leakage rates between 40 and 200 cf/m
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| BMP Efficacy: |
Can operate for compressors up to 3,000 psig safely
Dry seals typically leak at a rate of only 0.5 to 3 cf/m
Significantly less than the 40 to 200 cf/m emissions from wet seals
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| Date Entered: |
2010-07-29 08:33 UTC |
| Last Updated: |
2011-07-17 13:53 UTC |
