ASTM F327-08(2022)

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: F327 − 08 (Reapproved 2022)
Standard Practice for
Sampling Gas Blow Down Systems and Components for
Particulate Contamination by Automatic Particle Monitor
Method
ThisstandardisissuedunderthefixeddesignationF327;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Summary of Practice
1.1 This practice describes how to connect, prepare, and
3.1 The pressurized gas system or component and the
sample pressurized gas systems (having up to 19.1-mm (0.75-
apparatus are prepared in accordance with the requirements of
in.) diameter lines) for particulate contamination by using an
the users sample analysis procedure. The sensing unit of the
automatic monitor. automatic particle monitor is connected to the designated
sample port which is under purge condition. The system
1.2 ThevaluesstatedinMKSunitsaretoberegardedasthe
flow-rate is adjusted to the sample flow rate requirement. All
standard. The values given in parentheses are for information
the gas passing through the sensing unit is monitored for
only.
particulatecontaminationuntiltherequiredsamplevolumehas
1.3 This standard does not purport to address all of the
been analyzed.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Apparatus
priate safety, health, and environmental practices and deter-
4.1 Automatic Monitor, with sensor that sizes and counts all
mine the applicability of regulatory limitations prior to use.
entering fluid in accordance with the users requirements for
For hazard statements, see Section 5.
pressure, flow, temperature, and accuracy.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4.2 Filtered Gas System—See Fig. 1.
ization established in the Decision on Principles for the
4.3 Stop Watch or Timer, with a+1,−0-s resolution.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4.4 Miscellaneous Fittings, as needed for sampling point
Barriers to Trade (TBT) Committee.
adaption, cleaned and packaged within system contamination
requirements.
2. Terminology
4.5 Connecting Lines, cleaned and packaged within system
2.1 Definitions:
contamination requirements.
2.1.1 downstream terminal point—the point in a gas system
from which gas is fed into a further system or component, 4.6 Flowmeter,calibratedforthesampleportfluid,flow,and
usually the designated “sample port.” temperature requirements.
2.1.2 filtered gas system—agassystemthatisequippedwith
5. Hazards
required filtration devices to furnish gas that is suitably clean
for the intended application.
5.1 Personnel must stand clear of exiting gas.
2.1.3 purge—to flush a gas supply system or component
5.2 Ear protection must be used when gas flow approaches
with a regulated flow of gas.
sonic velocity.
2.1.4 sample port—the designated point in a gas system or
5.3 All lines and associated system components must be
component from which a representative gas sample may be
connected and operated within the requirements of recognized
taken.
safety codes.
This practice is under the jurisdiction of ASTM Committee E21 on Space
6. Procedure
Simulation andApplications of SpaceTechnology and is the direct responsibility of
Subcommittee E21.05 on Contamination.
6.1 Establish a minimum continuous purge pressure of 6.89
Current edition approved April 1, 2022. Published May 2022. Originally
3 3
kPa (1 psig) gage or 2.83 dm /min (0.1 ft /min), flow from the
approvedin1972.Lastpreviouseditionapprovedin2015asF327–08(2015).DOI:
10.1520/F0327-08R22. filtered gas pressure supply.
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