GB/T 18443.4-2010 English PDF (GB/T18443.4-2010)

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GB/T 18443.4-2010: Testing method of performance for vacuum insulation cryogenic equipment - Part 4: Leak-outgassing rate measurement
GB/T 18443.4-2010
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020
J 74
Replace GB/T 18443.4-2001
Testing method of performance for vacuum insulation
cryogenic equipment - Part 4.Leak-outgassing rate
measurement
ISSUED ON. SEPTEMBER 26, 2010
IMPLEMENTED ON. FEBRUARY 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Test principle and method... 6
5 Test devices, equipment, and instruments... 7
6 Test conditions and test preparation... 7
7 Test steps... 8
8 Data processing... 9
9 Test records and test reports... 11
Appendix A (Informative) Leak-outgassing rate test record (direct method)... 12
Appendix B (Informative) Leak-outgassing rate test report... 15
Testing method of performance for vacuum insulation
cryogenic equipment - Part 4.Leak-outgassing rate
measurement
1 Scope
This part of GB/T 18443 specifies the requirements of the test principle and method,
test devices, equipment and instruments, test conditions and test preparations, test
procedures, data processing, test records, and test reports for the measurement of
interspace leak-outgassing rate of vacuum insulated cryogenic equipment.
This part applies to the measurement of interspace leak-outgassing rate of vacuum
insulated cryogenic equipment, such as vacuum insulated cryogenic pressure vessels
except for the storage and transportation of liquid hydrogen medium, vacuum insulated
cryogenic welded gas cylinders, vacuum insulated pipes and pipe fittings; the
measurement of other equipment can be implemented by reference.
2 Normative references
The provisions in the following documents become the provisions of this Part through
reference in this Part of GB/T 18443.For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Part, however,
parties who reach an agreement based on this Part are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition of
the referenced document applies to this Part.
GB/T 18443.1-2010 Testing method of performance for vacuum insulation
cryogenic equipment - Part 1.Basic requirements
GB/T 18443.2 Testing method of performance for vacuum insulation cryogenic
equipment - Part 2.Vacuum degree measurement
GB/T 18443.3 Testing method of performance for vacuum insulation cryogenic
equipment - Part 3.Leak rate measurement
3 Terms and definitions
The terms and definitions established in GB/T 18443.1-2010, GB/T 18443.2, GB/T
18443.3 and the following apply to this part.
the test.
7 Test steps
7.1 Direct measurement method
7.1.1 After the vacuum valve of the measured piece is closed, the temperatures of the
inner liner and the outer shell are close to the ambient temperature, and the interspace
pressure is relatively stable, measure the initial interspace vacuum degree, and start
recording data at the same time.
7.1.2 The duration of the test shall be not less than 2 h and not more than 72 h; measure
the vacuum degree after standing.
7.1.3 The time interval for recording the vacuum degree P1(t) shall not be greater than
2 h.
7.2 Indirect measurement method
7.2.1 Indirect measurement method 1
7.2.1.1 Close the vacuum valve of the measured piece and the vacuum valve of the
pumping system, record the background vacuum degree of the measuring pipeline, then
open the vacuum valve of the measured piece, and observe the change of the vacuum
degree of the measuring pipeline. After the pressure is balanced, record the stable initial
vacuum degree of the connected space and the time.
7.2.1.2 The duration of the test shall be not less than 2 h and not more than 72 h, and
the change process of the vacuum degree P2(t) of the connected space with time shall
be recorded at a time interval of not more than 10 min.
7.2.1.3 Close the vacuum valve of the measured piece and the vacuum valve of the
pumping system, measure the leak-outgassing rate of the measuring pipeline by the
direct measurement method, and record the change process of the vacuum degree P3(t)
of the measuring pipeline with time at a time interval of not more than 10 min.
7.2.1.4 After the measurement is completed, open the vacuum valve of the measured
piece and the vacuum valve of the pumping system, and re-evacuate the measured piece
to the original vacuum degree.
7.2.2 Indirect measurement method 2
7.2.2.1 Close the vacuum valve of the measured piece and the vacuum valve of the
pumping system, record the background vacuum degree of the measuring pipeline, then
open the vacuum valve of the measured piece, and observe the change of the vacuum
degree of the measuring pipeline. After the pressure is balanced, record the stable initial
vacuum degree P1 of the connected space; P1 is the initial interspace vacuum degree P1′
of the measured piece; close the vacuum valve of the measured piece, and record the
time at the same time.
7.2.2.2 The duration of the test shall be not less than 2 h and not more than 72 h; close
the vacuum valve of the pumping system, record the background vacuum degree P0 of
the pipeline, open the vacuum valve of the measured piece, and observe the change of
the vacuum degree of the measuring pipeline. Observe for 2 min; after the pressure
between the interspace and the measuring pipeline space is balanced, record the stable
vacuum degree P2 of the connected space.
7.2.2.3 After the measurement is completed, open the vacuum valve of the measured
piece and the vacuum valve of the pumping system, and re-evacuate the measured piece
to the original vacuum degree.
8 Data processing
8.1 When using the direct measurement method to measure the leak-outgassing rate,
calculate it according to formula (1).
Where.
Q --- The leak-outgassing rate of the vacuum interspace of the measured piece,
and the unit is Pa cubic meters per second (Pa • m3/s);
P1 --- The rate of change of the interspace vacuum degree, and the unit is Pa per
second (Pa/s); that is, the ratio of the amount of change of the interspace
vacuum degree ΔP1(t) to the time Δt required by the happening of the
change; take the amount of change in the last 1/3 time period of the test
recording time as ΔP1(t);
V --- The geometric volume of the vacuum interspace of the measured piece, in
cubic meters (m3);
K --- The correction coefficient of interspace volume; for vacuum insulation, K=1;
for vacuum multi-layer insulation, K=0.9; for vacuum powder insulation,
K=0.6.
8.2 When using the indirect measurement method 1 to measure the leak-outgassing rate,
calculate it according to formula (2).
Where.
Q --- The leak-outgassing rate of the vacuum interspace of the measured piece,
and the unit is Pa cubic meters per second (Pa • m3/s);
P2 --- The change rate of vacuum degree in connected space, and the unit is Pa per
second (Pa/s); that is, the ratio of the amount of change of the vacuum
degree in connected space ΔP2(t) to the time Δt required by the happening
of the change; take the amount of change in the last 1/3 time period of the
test recording time as ΔP2(t).
V0 --- The geometric volume of the measuring pipeline, in cubic meters (m3);
K --- The correction coefficient of interspace volume; for vacuum insulation, K=1;
for vacuum multi-layer insulation, K=0.9; for vacuum powder insulation,
K=0.6;
V --- The geometric volume of the vacuum interspace of the measured piece, in
cubic meters (m3);
P3 --- The change rate of the vacuum degree of the measuring pipeline, and the
unit is Pa per second (Pa/s); that is, the ratio of the amount of change of the
vacuum degree of the measuring pipeline ΔP3(t) to the time Δt required by
the happening of the change; take the amount of change in the last 1/3 time
period of the test recording time as ΔP3(t).
8.3 When using the indirect measurement method 2 to measure the leak-outgassing rate,
calculate it according to the following formulas.
8.3.1 The interspace vacuum degree after the standing time interval t is calculated
according to formula (3).
Where.
GB/T 18443.4-2010
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020
J 74
Replace GB/T 18443.4-2001
Testing method of performance for vacuum insulation
cryogenic equipment - Part 4.Leak-outgassing rate
measurement
ISSUED ON. SEPTEMBER 26, 2010
IMPLEMENTED ON. FEBRUARY 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Test principle and method... 6
5 Test devices, equipment, and instruments... 7
6 Test conditions and test preparation... 7
7 Test steps... 8
8 Data processing... 9
9 Test records and test reports... 11
Appendix A (Informative) Leak-outgassing rate test record (direct method)... 12
Appendix B (Informative) Leak-outgassing rate test report... 15
Testing method of performance for vacuum insulation
cryogenic equipment - Part 4.Leak-outgassing rate
measurement
1 Scope
This part of GB/T 18443 specifies the requirements of the test principle and method,
test devices, equipment and instruments, test conditions and test preparations, test
procedures, data processing, test records, and test reports for the measurement of
interspace leak-outgassing rate of vacuum insulated cryogenic equipment.
This part applies to the measurement of interspace leak-outgassing rate of vacuum
insulated cryogenic equipment, such as vacuum insulated cryogenic pressure vessels
except for the storage and transportation of liquid hydrogen medium, vacuum insulated
cryogenic welded gas cylinders, vacuum insulated pipes and pipe fittings; the
measurement of other equipment can be implemented by reference.
2 Normative references
The provisions in the following documents become the provisions of this Part through
reference in this Part of GB/T 18443.For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Part, however,
parties who reach an agreement based on this Part are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition of
the referenced document applies to this Part.
GB/T 18443.1-2010 Testing method of performance for vacuum insulation
cryogenic equipment - Part 1.Basic requirements
GB/T 18443.2 Testing method of performance for vacuum insulation cryogenic
equipment - Part 2.Vacuum degree measurement
GB/T 18443.3 Testing method of performance for vacuum insulation cryogenic
equipment - Part 3.Leak rate measurement
3 Terms and definitions
The terms and definitions established in GB/T 18443.1-2010, GB/T 18443.2, GB/T
18443.3 and the following apply to this part.
the test.
7 Test steps
7.1 Direct measurement method
7.1.1 After the vacuum valve of the measured piece is closed, the temperatures of the
inner liner and the outer shell are close to the ambient temperature, and the interspace
pressure is relatively stable, measure the initial interspace vacuum degree, and start
recording data at the same time.
7.1.2 The duration of the test shall be not less than 2 h and not more than 72 h; measure
the vacuum degree after standing.
7.1.3 The time interval for recording the vacuum degree P1(t) shall not be greater than
2 h.
7.2 Indirect measurement method
7.2.1 Indirect measurement method 1
7.2.1.1 Close the vacuum valve of the measured piece and the vacuum valve of the
pumping system, record the background vacuum degree of the measuring pipeline, then
open the vacuum valve of the measured piece, and observe the change of the vacuum
degree of the measuring pipeline. After the pressure is balanced, record the stable initial
vacuum degree of the connected space and the time.
7.2.1.2 The duration of the test shall be not less than 2 h and not more than 72 h, and
the change process of the vacuum degree P2(t) of the connected space with time shall
be recorded at a time interval of not more than 10 min.
7.2.1.3 Close the vacuum valve of the measured piece and the vacuum valve of the
pumping system, measure the leak-outgassing rate of the measuring pipeline by the
direct measurement method, and record the change process of the vacuum degree P3(t)
of the measuring pipeline with time at a time interval of not more than 10 min.
7.2.1.4 After the measurement is completed, open the vacuum valve of the measured
piece and the vacuum valve of the pumping system, and re-evacuate the measured piece
to the original vacuum degree.
7.2.2 Indirect measurement method 2
7.2.2.1 Close the vacuum valve of the measured piece and the vacuum valve of the
pumping system, record the background vacuum degree of the measuring pipeline, then
open the vacuum valve of the measured piece, and observe the change of the vacuum
degree of the measuring pipeline. After the pressure is balanced, record the stable initial
vacuum degree P1 of the connected space; P1 is the initial interspace vacuum degree P1′
of the measured piece; close the vacuum valve of the measured piece, and record the
time at the same time.
7.2.2.2 The duration of the test shall be not less than 2 h and not more than 72 h; close
the vacuum valve of the pumping system, record the background vacuum degree P0 of
the pipeline, open the vacuum valve of the measured piece, and observe the change of
the vacuum degree of the measuring pipeline. Observe for 2 min; after the pressure
between the interspace and the measuring pipeline space is balanced, record the stable
vacuum degree P2 of the connected space.
7.2.2.3 After the measurement is completed, open the vacuum valve of the measured
piece and the vacuum valve of the pumping system, a...