1 Bob Hughes-FTSCPAC Mark LaPrevotte-FTSCLANT Cleaning Oxygen and Diver’s Breathing Air...
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Transcript of 1 Bob Hughes-FTSCPAC Mark LaPrevotte-FTSCLANT Cleaning Oxygen and Diver’s Breathing Air...
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Bob Hughes-FTSCPACMark LaPrevotte-FTSCLANT
Cleaning Oxygen and Diver’s Breathing Air Instruments
Eliminating Ozone Depleting Solvents
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Background• Navy OICR’s clean oxygen
Instrumentation with CFC-113 solvent and verify cleanliness with Infrared (IR) Spectroscopy
• CFC-113 solvent is an Ozone Depleting Solvent that stopped manufacture in 1996 IAW the Montreal Protocol
• CFC-113 is stockpiled in the DoD Mission Critical Reserve
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Stockpile• Initially sized for 2 years to “buy time”
until alternative in place
• Sizable stockpile remains due to late purchase, conservation, and use of replacement solvents for other applications
• Some estimates indicate it could last at least 10 years
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Stockpile• The life span may be reduced to 4 to 5 years
based on:– USAF may replace HCFC-141b in spray cans with
CFC-113 due to near-term future use restrictions (2000 gallons annually)
– One LOX producer has required partial flushing in the last 4 years. A complete flush uses 1500 gallons
– Resources to maintain stockpile indefinitely have not been programmed
– Quality problems
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Stockpile PolicySupply CFC-113 until it is depleted, at
which time approved alternative
replacement solvents will be substituted
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HFE-7100• Replacement oxygen instrument cleaning
solvent for CFC-113
• No ozone-depleting potential
• Toxicity similar to CFC-113
• No compatibility problems
• Can be used with existing cleaning and atmosphere monitoring equipment
• Quality product available per A-A-59105
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HFE-7100 • Cleaning Performance - Dissolving and
Displacement– Marginal hydrocarbon solvency– Excellent fluorocarbon solvency– Excellent removal by displacement due to low
surface tension and high density– NASA testing showed for instrument cleaning,
HFE-7100 removed 92% of soil and CFC-113 removed 97%
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Cleanliness Verification - IR• IR analysis is usable ONLY with solvents
that are transparent in the C-H Stretch Region
• All approved replacement solvents (HCFC-141b, HCFC-225, and HFE-7100) are not verifiable with IR
• Unlikely that other candidate solvents will be verifiable with IR
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• Industry standard is Non-Volatile Residue (NVR) by Evaporative Gravimetrics
• NVR usable with any solvent
• NVR requires 75 to 100 ml sample
• Takes 2 hours per analysis
• Must be performed in a Chemistry Laboratory
Cleanliness Verification - NVR
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• Optically Stimulated Electron Emission (OSEE) is newly developed alternative analysis technique
• OSEE usable with any solvent
• 1.5 ml sample taken as gage is cleaned
• Performed on-site in OICR in about 20 minutes
• Replaces NVR and implemented at NASA
Cleanliness Verification - OSEE
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OSEE Synopsis• An instrument shines an ultraviolet light on
a surface and measures the electrons emitted from the surface. As the surface is more soiled, it will emit less light (electrons).
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OSEE Synopsis (Cont’d)• An evaporating dish is hand cleaned with
detergent. This dish holds the solvent. After the solvent evaporates, it leaves residue behind. This residue is compared to the residue remaining from a 5 ppm standard to determine if it is above or below 5 ppm.
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Equipment The equipment easily fits into OICR
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On-Site Testing (Past and Proposed)• Testing has been accomplished at PSNS
and NASA for the last 2 years
• Perform additional on-site testing at minimum of two facilities (other than PSNS), one under FTSCPAC and the other under FTSCLANT, for one year
• Clean with CFC-113 and analyze with IR and OSEE
• Closely monitor testing and get input
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• Equipment will be provided to activities that request the equipment and agree to use the equipment (limited quantities)
• Operation of equipment will be verified and sampling line will be oxygen cleaned
• Equipment will be assembled into a kit and shipped (limited quantities)
• Training will be provided by Bangor, WA when established
• Bangor, WA will provide 5 ppm standards
Implementation
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Implementation
• Facilities can clean with CFC-113 and analyze using both IR and OSEE to gain confidence and familiarity with OSEE
• Once comfortable with OSEE, it is the option of the facility to use CFC-113 with IR and/or OSEE or HFE-7100 with OSEE until stockpile depleted
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• A new manual for Instrument and Gage Cleaning for MIL-STD-1330 (-) Applications will be generated
• Currently usable by NAVSEA Facilities, Vendors, and Foreign Military
When will this happen?
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Why do we need to do this?• The stockpile is not programmed to last
“forever”
• A change of events could deplete it rapidly
• IR can not be used for new oxygen cleaning solvents
• It aligns the Navy with Industry (currently we use IR and industry uses NVR)
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Why do we need to do this?• The Navy has been directed to eliminate
the use of Ozone Depleting Solvents
• Implementing an alternative starting now and over a period of 5 years will ease the transition
• It is inevitable
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Diver’s Breathing Air Instruments
• MIL-STD-1622(B): Appendix C added to address diver’s air breathing instruments. Status: At NAVSEA for approval
• UIPI 5510-905(-): New UIPI for cleaning diver’s air breathing systems, including instruments. Status: Has been issued
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Calibration Only-No Cleaning• Installed Instrument
– Used exclusively in Diver’s breathing air or cleaner application
• New or previously cleaned and not installed– Sticker or tag indicating cleaned per MIL-
STD-1622 or equal
• Properly packaged
• Internals pass visual inspection
If any of these not met, cleaning is required
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Cleaning and Calibration• Pre-cleaning and final cleaning
– Inspection of internals reveals other than particulate
• Final cleaning only (pre-cleaning not required)– Inspection of internals reveals only particulate
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• Pre-cleaning– Apply pre-cleaner (HFE-71DE or CFC-
113) using any method such as a syringe
– Rotate instrument to wet internals
– Repeat until 10 ml is obtained
– Visually inspect effluent
– Repeat until passes visual inspection
Cleaning Procedures
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• Final Cleaning– Option 1:
• Repeat precleaning except use final cleaner (HFE-7100 or CFC-113)
• Perform final cleaning once for instruments that hold less than 10 ml and twice for instruments that hold more than 10 ml
Cleaning Procedures
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• Final Cleaning– Option 2:
• Final clean per NAVSEA ST700-AM-GYD-010/OICR except use dedicated equipment
• Analysis for organic cleanliness verification (hydrocarbons) is not required
Cleaning Procedures
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NEW TECHNOLOGY
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Fast
Rugged
Automated
Small Sample Size
NanoScale 9100
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Run more samples in less time
Easy to run verification samples
Average run time is 5 to 7 minutes
FAST
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No vibration isolation required
Office type environment acceptable
Easily transported
RUGGED
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Reduces human error
Can be integrated with other tasks
Highly skilled operators not required
Automated
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Greatly reduces emissions
Reduces cost of analysis
Greatly reduces depletion of a bath in
a production QC application
SMALL SAMPLE SIZE
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Log sample information
Acquire sample
Inject sample
Record results
Clean to prepare for next sample
SIMPLE TO OPERATE
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Log Sample Information
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Acquire Sample
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Acquire Sample
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Acquire Sample
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Acquire Sample
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Acquire Sample
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Fast, rugged, automated, small sample
size
Simple to operate
Unique Flexural Plate Wave (FPW)
gravimetric sensor
Nanogram sensitivity
SUMMARY
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Direct readout in mass or
concentration
Reduces total laboratory emissions
NVR measurement in as little as 5
minutes
Variety of applications
SUMMARY (Con’t)
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Company incorporating recommended
improvements
Technology “new” in industry less
than one year
NASA doing evaluation
Possible Navy evaluation
CURRENT STATUS