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ASTM F310-70(2000)

(Practice)

Standard Practice for Sampling Cryogenic Aerospace Fluids

Standard Practice for Sampling Cryogenic Aerospace Fluids

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 and health practices and determine the applicability of regulatory limitations prior to use. For hazard statement, see Section 5.

General Information

Status
Historical
Publication Date
31-Dec-1999
ICS
49.080 - Aerospace fluid systems and components
Technical Committee
E21 - Space Simulation and Applications of Space Technology
Drafting Committee
E21.05 - Contamination
Current Stage
Ref Project

Relations

Replaces
ASTM F310-70(1996) - Standard Practice for Sampling Cryogenic Aerospace Fluids
Effective Date
01-Jan-2000
Replaced By
ASTM F310-04 - Standard Practice for Sampling Cryogenic Aerospace Fluids
Effective Date
01-Sep-2004
Referred By
ASTM F307-13(2020) - Standard Practice for Sampling Pressurized Gas for Gas Analysis
Effective Date
01-Jan-2000

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ASTM F310-70(2000) - Standard Practice for Sampling Cryogenic Aerospace FluidsASTM F310-70(2000) - Standard Practice for Sampling Cryogenic Aerospace Fluids
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ASTM F310-70(2000) - Standard Practice for Sampling Cryogenic Aerospace Fluids
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F 310 – 70 (Reapproved 2000)
Standard Practice for
Sampling Cryogenic Aerospace Fluids
This standard is issued under the fixed designation F 310; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4.3 Protective Clothing, such as an apron, face shield, and
gloves.
1.1 This practice describes procedures for taking a sample
4.4 Stainless Steel Catch Bucket (hydrocarbon clean if used
of cryogenic aerospace fluid for analysis.
for liquid oxygen sampling).
1.2 This standard does not purport to address all of the
4.5 Liquid Cryogenic Sampler, TTU-131/E, as described in
safety concerns, if any, associated with its use. It is the
MIL-S-27626A (U-SAF) and MIL-P-25508D.
responsibility of the user of this standard to establish appro-
4.6 Miscellaneous Fittings, for sample point adaption
priate safety and health practices and determine the applica-
(cleaned to be hydrocarbon and particulate-controlled in accor-
bility of regulatory limitations prior to use. For hazard state-
dance with system requirements).
ment, see Section 5.
4.7 Polyethylene Wash Bottle, 1-L capacity, filled with
2. Referenced Documents
trichlorotrifluoroethane per MIL-C-81302, filtered in the man-
ner described in ASTM Practice F 311.
2.1 ASTM Standards:
4.8 Flexible Hose, pressure-rated at 500 psig (3447 kPa
F 311 Practice for Processing Aerospace Liquid Samples for
gage) suitable for minimum temperature to be encountered and
Particulate Contamination Analysis Using Membrane Fil-
made of materials compatible with the fluid being sampled.
ters
4.9 Polychlorotrifluoroethylene Bag.
2.2 Military Standards:
MIL-C-81302
5. Hazards
MIL-P-25508D
5.1 When sampling cryogenic fluids, care should always be
MIL-S-27626A (U-SAF)
exercised to avoid contact with fluid or cold gas to prevent
3. Summary of Practice
painful frostbite. During the chill-down process, caution should
also be exercised as gas exiting from the sampling point is
3.1 A clean container is used to collect a sample of
under high pressure.
cryogenic aerospace fluid either from a sampling valve, or
poured from a larger Dewar flask used for storage. The
6. Procedure Using Dewar Flask
sampling container is chilled down by the exiting cold gas and
6.1 Clean the outlet of the sampling port with fluid from a
liquid until it will contain only liquid to be used for analysis.
polyethylene wash bottle.
4. Apparatus
6.2 Open the sampling valve and allow the chill-down to
occur until liquid is flowing into the catch bucket.
4.1 Dewar Flask, 1-L capacity.
6.3 Remove the cover from the Dewar flask.
4.2 Dewar Cover, with provisions for venting.
6.4 Hold the flask in a stream of liquid and fill to approxi-
NOTE 1—It is mandatory that this Dewar flask be maintained in a clean
mately one-half full. Dump the liquid in the catch bucket.
condition (particulate and hydrocarbon control).
...

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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.
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SIGNIFICANCE AND USE
7.1 Although a cleaning action is imparted to the test component, it is not the intent of this practice to serve as a cleaning procedure. Components are normally cleaner after each consecutive test; thus repeated tests may be used to establish process limits for a given component (Fig. 4). A specific set of test parameters must be supplied by the agency specifying cleanliness limits. Fig. 1, Fig. 2, and Fig. 3 may be used as a guide to establish the desired parameters of test fluid, vibration, extraction, and analysis.
FIG. 4 Contamination per Test Run Versus Consecutive Test Run Number  
7.2 The curve in Fig. 4 shows the typical behavior of a component when tested for cleanliness several consecutive times. Stabilization generally occurs before the fifth successive run. The stabilized region starts where a horizontal line through the maximum stabilized value intersects the curve.  
7.3 The allowable cleanliness limit of a test component should be based on the cleanliness requirements of the system in which it will be used, and the assigned value should be greater than the maximum stabilized value. When defining the allowable cleanliness limits, an important consideration is that the accuracy of the results decreases as the allowable limit value approaches the stabilized value.
SCOPE
1.1 These practices cover sampling procedures for use in determining the particle cleanliness of liquids and liquid samples from components. Three practices, A, B, and C, have been developed on the basis of component geometry in order to encompass the wide variety of configurations. These practices establish guidelines to be used in preparing detailed procedures for sampling specific components.  
Note 1: The term cleanliness used in these practices refers to solid particles in the liquid. It does not generally cover other foreign matter such as gases, liquids, and products of chemical degradation. Cleanliness with respect to particulate contamination does not necessarily give any indication of the other types of contamination.  
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Substitute fluids are recommended in place of end item fluids for preassembly cleanliness determinations on components using hazardous end item fluids. After obtaining the sample, the substitute fluid must be totally removed from the test part with particular caution given to the possibility of trapped fluid. It is hazardous to use a substitute fluid for testing assembled parts where the fluid can be trapped in dead ends, behind seals, and so forth.)  
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