ASTM F327-78(2000)
(Practice)Standard Practice for Sampling Gas Blow Down Systems and Components for Particulate Contamination by Automatic Particle Monitor Method
Standard Practice for Sampling Gas Blow Down Systems and Components for Particulate Contamination by Automatic Particle Monitor Method
ABSTRACT
This practice describes the apparatus needed, and the procedures for connecting, preparing, and sampling pressurized gas blow down systems and components for particulate contamination by the use an automatic particle monitor. The sensing unit of the automatic particle monitor is connected to the designated sample port which is under purge condition. The system flow rate is then adjusted to the sample flow rate requirement. Finally, all the gas passing through the sensing unit is monitored for particulate contamination until the required sample volume has been analyzed.
SCOPE
1.1 This practice describes how to connect, prepare, and sample pressurized gas systems (having up to 0.75-in. (19.1-mm) diameter lines) for particulate contamination by using an automatic monitor.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety problems 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 statements, see Section 5.
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Designation:F327–78(Reapproved2000)
Standard Practice for
Sampling Gas Blow Down Systems and Components for
Particulate Contamination by Automatic Particle Monitor
1
Method
This standard is issued under the fixed designation F327; 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.
1. Scope the gas passing through the sensing unit is monitored for
particulatecontaminationuntiltherequiredsamplevolumehas
1.1 This practice describes how to connect, prepare, and
been analyzed.
sample pressurized gas systems (having up to 0.75-in. (19.1-
mm) diameter lines) for particulate contamination by using an
4. Apparatus
automatic monitor.
4.1 Automatic Monitor, with sensor that sizes and counts all
1.2 The values stated in inch-pound units are to be regarded
entering fluid in accordance with the users requirements for
as the standard. The values given in parentheses are for
pressure, flow, temperature, and accuracy.
information only.
4.2 Filtered Gas System—See Fig. 1.
1.3 This standard does not purport to address all of the
4.3 Stop Watch or Timer, with a+1,−0-s resolution.
safety concerns, if any, associated with its use. It is the
4.4 Miscellaneous Fittings, as needed for sampling point
responsibility of the user of this standard to establish appro-
adaption, cleaned and packaged within system contamination
priate safety and health practices and determine the applica-
requirements.
bility of regulatory limitations prior to use. For hazard state-
4.5 Connecting Lines, cleaned and packaged within system
ments, see Section 5.
contamination requirements.
2. Terminology 4.6 Flowmeter, calibrated for the sample port fluid, flow,
and temperature requirements.
2.1 Definitions:
2.1.1 downstream terminal point—the point in a gas system
5. Hazards
from which gas is fed into a further system or component,
5.1 Personnel must stand clear of exiting gas.
usually the designated “sample port.”
5.2 Ear protection must be used when gas flow approaches
2.1.2 filtered gas system—a gas system that is equipped
sonic velocity.
with required filtration devices to furnish gas that is suitably
5.3 All lines and associated system components must be
clean for the intended application.
connected and operated within the requirements of recognized
2.1.3 purge—to flush a gas supply system or component
safety codes.
with a regulated flow of gas.
2.1.4 sample port—the designated point in a gas system or
6. Procedure
component from which a representative gas sample may be
6.1 Establish a minimum continuous purge pressure of 1
taken.
3 3
psig (6.89 kPa) gage or 0.1 ft /min (2.83 dm /min), flow from
3. Summary of Practice the filtered gas pressure supply.
6.2 Connect one end of a suitable connecting line to the
3.1 The pressurized gas system or component and the
purge outlet of 6.1, and then connect the other end to the inlet
apparatus are prepared in accordance with the requirements of
of the component or system to be sampled.
the users sample analysis procedure. The sensing unit of the
automatic particle monitor is connected to the designated
NOTE 1—Ifthesystemtobesampledisalreadyconnectedtothefiltered
sample port which is under purge condition. The system gas pressure supply, then establish the purge as noted in 6.1.
flow-rate is adjusted to the sample flow rate requirement. All
6.3 Connect a suitable connecting line from the sample port
to the inlet of the automatic monitor sensing device. (When no
1
sample port is designated, use the down-stream terminal point
This practice is under the jurisdiction of ASTM Committee E21 on Space
Simulation andApplications of SpaceTechnology and is the direct responsibility of from which purge gas is flowing.)
Subcommittee E21.05 on Contamination.
6.4 Increase the purge to one of the following:
Current edition approved Aug. 25, 1978. Published October 1978. Originally
published as F327–72. Last previous edition F327–72.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F327
FIG. 1 Filtered Gas System
3 3
6.4.1 0.3-ft /min (8.49-dm /min) flow, 6.7 Set automatic monitor display to zero.
6.4.2 5-psig (34.5-kPa) gage pressure, or 6.8 Simultaneously begin automatic particulate counting,
6.4.3 5%ofsystemoperatingpressurewhenthispressureis sizing and timing of volumetric flow.
less than 5-psig (34.5-kPa) gage. 6.9 Record particulate contamination counts on the monitor
6.5 Surge Pressure Cleaning: display for the required sample volume.
6.5.1 Quickly increase the continuous purge pressure for a 6.10 Adjust the co
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