ASTM F310-07(2020)
(Practice)Standard Practice for Sampling Cryogenic Aerospace Fluids
Standard Practice for Sampling Cryogenic Aerospace Fluids
ABSTRACT
This practice establishes the apparatuses and materials needed, possible hazards, and two standard procedures for taking samples of cryogenic aerospace fluids for analysis. For the Dewar flask procedure, a clean Dewar flask is used to collect a sample of cryogenic aerospace fluid either from a sampling valve, or poured from a Dewar flask used for storage. Whereas, for the cryogenic sampler procedure, the sampler is used to withdraw a small amount of liquefied gas from a large supply, and is then allowed to cool until a steady stream of cryogenic liquid exists in the sampler. Once the sampling valves are closed, the trapped liquid will convert to gas and pressurize the sampling vessel.
SCOPE
1.1 This practice describes procedures for taking a sample of cryogenic aerospace fluid for analysis.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory requirements prior to use. For hazard statement, see Section 5.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F310 − 07 (Reapproved 2020)
Standard Practice for
Sampling Cryogenic Aerospace Fluids
ThisstandardisissuedunderthefixeddesignationF310;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 3.2 Cryogenic Sampler Procedure—The sampler is used to
withdraw a small amount of liquefied gas from a large supply.
1.1 This practice describes procedures for taking a sample
The sampler is allowed to cool until a steady stream of
of cryogenic aerospace fluid for analysis.
cryogenic liquid exists in the sampler. Once the sampling
1.2 This standard does not purport to address all of the
valves are closed the trapped liquid will convert to a gas and
safety concerns, if any, associated with its use. It is the
pressurize the sampling vessel.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4. Apparatus and Materials
mine the applicability of regulatory requirements prior to use.
4.1 Apparatus and Materials Common to Both Procedures:
For hazard statement, see Section 5.
4.1.1 Protective Clothing, such as an apron, face-shield, and
1.3 This international standard was developed in accor-
thermal gloves. Coveralls meeting safety requirements for
dance with internationally recognized principles on standard-
static dissipation, and flammability may be required depending
ization established in the Decision on Principles for the
on local safety regulations or operating procedures. White
Development of International Standards, Guides and Recom-
coveralls are recommended while working with cryogenic
mendations issued by the World Trade Organization Technical
oxygen as they will show dirt or oil which may react violently
Barriers to Trade (TBT) Committee.
with cryogenic oxygen.
4.1.2 Wash Bottle, 1–L made of a material compatible with
2. Referenced Documents
the solvent selected for the cleaning procedure, Teflon FEP is
2.1 ASTM Standards:
generally acceptable with the solvents and fluids used.
F311 Practice for Processing Aerospace Liquid Samples for
4.1.3 Solvents—must be selected to meet the performance,
Particulate Contamination Analysis Using Membrane Fil-
safety, cleanliness, and environmental requirements based on
ters
standardized procedures, local and international environmental
G93 Guide for Cleanliness Levels and Cleaning Methods for
regulations, and local procedures.
Materials and Equipment Used in Oxygen-Enriched En-
4.1.3.1 Cleaning Solvents for Cryogenic Oxygen Sampling
vironments
Equipment—Solvents for use on oxygen sampling equipment
G127 Guide for the Selection of Cleaning Agents for
should be selected in accordance with 5.6. Examples of
Oxygen-Enriched Systems
solvents currently used for this purpose include, but are not
limited to:
3. Summary of Practice
Hydrofluorochlorocarbons, such as Asahiklin AK 225,
3.1 Dewar Flask Procedure—A clean Dewar Flask is used Hydrofluorocarbons, such as DuPont Vertrel XF or Vertrel
to collect a sample of cryogenic aerospace fluid either from a MCA,
sampling valve, or poured from a larger Dewar flask used for Hydrofluoroethers, such as 3M HFE 7100 or HFE 71DE,
storage. Water-based solvents, such as non-ionic detergents.
4.1.3.2 Cleaning Solvent for Sampling Equipment Used with
other Cryogenic Fluids:
This practice is under the jurisdiction of ASTM Committee E21 on Space
Ethylacetateshallhavenomorethan1µg/mLresidueafter
Simulation andApplications of Space Technology and is the direct responsibility of
evaporation,
Subcommittee E21.05 on Contamination.
Cyclohexaneshallhavenomorethan1µg/mLresidueafter
Current edition approved April 1, 2020. Published April 2020. Originally
evaporation,
approvedin1970.Lastpreviouseditionapprovedin2012asF310 – 07(2012).DOI:
10.1520/F0310-07R20.
The cleaning solvent will be an azeotrope mixture of ethyl
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
acetate and cyclohexane, filtered in accordance with Practice
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
F311. The mole fraction axeotropic mixture is 0.5286 ethyl
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. acetate and 0.4714 cyclohexane. This is prepared by mixing
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F310 − 07 (2020)
503 mL of ethyl acetate with 497 mL of cyclohexane to 6. Dewar Flask Procedure
produce 1 L of cleaning solvent. A fluorocarbon wash bottle
6.1 Clean all equipment to meet oxygen system cleanliness
should be used with this cleaning solvent.
standards in accordance with Guide G93.
4.2 Dewar Flask Procedure:
6.2 Clean the outlet of the sampling port with fluid from the
4.2.1 Dewar Flask, 1-L capacity.
wash bottle in 4.1.2 in accordance with Guide G93.
4.2.2 Dewar Cover, with provisions for venting.
6.3 Open the sampling valve and allow the chill-down to
4.2.3 Stainless Steel Catch Bucket—(hydrocarbon clean if
occur until liquid is flowing into the catch bucket.
used for liquid oxygen sampling).
4.2.4 Tongs, stainless steel (Type 300).
6.4 Remove the cover from the Dewar flask.
4.2.5 Carrying Case for flask.
6.5 Hold the flask in a stream of liquid and fill to approxi-
4.2.6 Polychlorotrifluoroethylene Bag.
mately one-half full. Dump the liquid in the catch bucket.
4.3 Cryogenic Sampler Procedure:
6.6 Repeat the procedure described in 6.4 until the flask has
4.3.1 Liquid Cryogenic Samplers
been sufficiently chilled down.
4.3.2 Miscellaneous Fittings, for adapting to the sample
...
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