GB/T 18443.8-2010 English PDF (GBT18443.8-2010)

This part of GB/T 18443 specifies the test principle and method, test devices, equipment and instruments, test conditions and test preparation, test procedures, data processing, test record and test report, and other requirements for the volume measurement of vacuum insulated cryogenic equipment. This Part applies to the volume measurement of vacuum insulated cryogenic pressure vessels, vacuum insulated cryogenic welded gas cylinders, vacuum insulated pipes and their fittings, other than the storage and transportation of liquid hydrogen medium.

GB/T 18443.8-2010
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020
J 74
Replacing GB/T 18443.1-2001
Testing method of performance for vacuum insulation
cryogenic equipment - Part 8.Volume measurement
ISSUED ON. SEPTEMBER 26, 2010
IMPLEMENTED ON. FEBRUARY 01, 2011
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Test principle and method... 6
5 Test devices, equipment and instruments... 7
6 Test conditions and test preparation... 7
7 Requirements for test procedures... 8
8 Data processing... 8
9 Test record and test report... 13
Appendix A (Informative) Volume test record (measurement by geometric dimensions) ... 14
Appendix B (Informative) Volume test report (measurement by geometric dimensions) ... 15
Testing method of performance for vacuum insulation
cryogenic equipment - Part 8.Volume measurement
1 Scope
This part of GB/T 18443 specifies the test principle and method, test devices, equipment and instruments, test conditions and test preparation, test procedures, data processing, test record and test report, and other requirements for the volume measurement of vacuum insulated cryogenic equipment.
This Part applies to the volume measurement of vacuum insulated cryogenic pressure vessels, vacuum insulated cryogenic welded gas cylinders, vacuum insulated pipes and their fittings, other than the storage and transportation of liquid hydrogen medium. 2 Normative references
The terms in the following documents become the terms of this Part through the reference of this Part of GB/T 18443.For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this Part. However, parties to agreements that are based on this Part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition 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
GB/T 18443.4, Testing method of performance for vacuum insulation cryogenic equipment - Part 4.Leak-outgassing rate measurement
GB/T 18443.5, Testing method of performance for vacuum insulation cryogenic equipment - Part 5.Static evaporation rate measurement
GB/T 18443.6, Testing method of performance for vacuum insulation cryogenic equipment - Part 6.Heat-leak rate measurement
Use the length measuring instrument - by measuring the length parameters of the regular geometric configuration of each measured piece - to calculate the volume that shall be included in the overall volume; accumulate the volume of each measured piece to obtain the overall volume. It is used for the measurement of geometric volume and interspace volume, etc.
4.2 Measurement by weighing
Fill the measured piece with liquid of known density, and calculate the volume of the measured piece by weighing the mass of the liquid. It is used for the measurement of container volume or component volume, etc.
4.3 Measurement by a flowmeter
Use a flowmeter to accumulatively measure the amount of liquid injected into or out of the measured piece, and calculate the volume of the measured piece.
5 Test devices, equipment and instruments
Test devices, equipment and instruments shall comply with the provisions of 4.2 in GB/T 18443.1-2010, and shall meet the following requirements.
a) Length measuring instruments shall meet the following requirements.
-- Steel ruler. accuracy 0.05, division value 1 mm;
-- Steel tape. accuracy grade II, indication error less than ±(0.3+0.2L) mm. b) The accuracy of thickness measuring instruments is 0.1 mm.
c) Weighing measuring instruments shall meet the following requirements. -- The maximum weighing is 1.5 ~ 3 times of the actual weighing;
-- Floor scale. weighing range 30 t, accuracy 1/1 000;
-- Rail scale. weighing range greater than 30 t, accuracy 1/1 000.
d) The accuracy of the flowmeter is grade 1.5.
6 Test conditions and test preparation
Test conditions and test preparation shall comply with the provisions of GB/T 18443.1. 7 Requirements for test procedures
7.1 Measurement by geometric dimensions
7.1.1 According to the size of the measured piece, use a steel tape to measure the outer circumference D of the measured piece, and use a thickness gauge to measure the wall thickness S; calculate its average inner radius R.
7.1.2 Use a steel ruler and a steel tape to measure the height of the measured piece from at least 3 points; calculate the average height H.
7.2 Measurement by weighing
7.2.1 Place the measured piece on the selected weighing instrument, and weigh out the mass m0 of the container or component when it is not filled with liquid. 7.2.2 When the measured piece is a component, fill the component with liquid, and weigh the mass m at this time.
7.2.3 When the measured piece is a container, fill the measured container with liquid. After reaching balance, refill the container with liquid.
7.2.4 Close the gas and liquid inlet and outlet valves of the measured piece, and weigh the total mass m.
7.3 Measurement by a flowmeter
7.3.1 Connect the measured piece to the flowmeter; record the initial value Q0 of the flowmeter; inject liquid.
7.3.2 Observe the duration, from the liquid is injected to the liquid overflows; record the cumulative value Q1 of the flowmeter.
7.3.3 During the test, record each test data.
8 Data processing
8.1 Measurement by geometric dimensions
8.1.1 The geometric volume of the cylinder shall be calculated according to Formula (1).
Where.
V3 – volume of the inner containment vessel component, in cubic meters (m3); n – number of components;
V3i – volume of the ith measured inner containment vessel component, in cubic meters (m3).
8.1.6 The volume of the interspace component shall be calculated according to Formula (5).
Where.
V’3 – volume of the vacuum insulation interspace component, in cubic meters (m3); n – number of components;
V’3i – volume of the ith measured vacuum insulation interspace component, in cubic meters (m3).
8.1.7 Calculation of the geometric volume of the inner containment vessel When the geometric volume of the inner containment vessel is measured by geometric dimensions, its geometric volume shall be calculated according to Formula (6). Where.
V inner – geometric volume of the inner containment vessel, in cubic meters (m3); V1 – geometric volume of the inner containment vessel cylinder, in cubic meters (m3); V2 – geometric volume of the inner containment vessel head, in cubic meters (m3); V3 – geometric volume of the inner containment vessel component, in cubic meters (m3).
8.1.8 Calculation of total geometric volume of the interspace
The total geometric volume of the interspace shall be calculated according to the Formula (7).
V’3 =
V inner = V1 + 2V2 - V3
V interspace = V outer – V’ inner
Where.
V interspace – interspace volume, in cubic meters (m3);
V outer – geometric volume of the outer shell, in cubic meters (m3), calculated according to Formula (8).
Where.
V outer – geometric volume of the outer shell, in cubic meters (m3);
V’1 – geometric volume of the outer shell cylinder, in cubic meters (m3); V’2 – geometric volume of the outer shell head, in cubic meters (m3);
V’3 – volume of the vacuum insulation interspace component, in cubic meters (m3). V’ inner – total volume of the inner containment vessel, in cubic meters (m3), calculated according to Formula (9).
Where.
V’’1 – volume of the inner containment vessel cylinder, in cubic meters (m3), calculated according to Formula (10).
Where.
d inner o – outer diameter of the inner containment vessel, in meters (m); Li – straight length of the inner containment vessel, including the length of the straight side of the head, in meters (m).
V’’2 – volume of the inner containment vessel head, in cubic meters (m3); the volume of the spherical head shall be calculated according to the Formula (11), and the volume of the standard elliptical head shall be calculated according to the Formula (12).
V outer = V’1 + 2V’2 – V’3
V’ inner = V’’1 + 2V’’2
V’’1 = d2inner o Li