Test method for evaluating hydrogen compatibility of plastic liner of high pressure gaseous hydrogen cylinders
1 Scope
This document specifies the general requirements, test conditions, test methods and test report of test for evaluating hydrogen compatibility of plastic liner of high pressure gaseous hydrogen cylinders.
This document is applicable to the test for evaluating hydrogen compatibility of plastic liner of high pressure gaseous hydrogen cylinders with hydrogen as storage medium and working temperature not lower than -40℃ and not higher than 85℃.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1033.1 Plastics - Methods for determining the density of non-cellular plastics - Part 1: Immersion method, liquid pyknometer method and titration method
GB/T 1040.1 Plastics - Determination of tensile properties - Part 1: General principles
GB/T 1040.2 Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics
GB/T 5163 Sintered metal materials, excluding hardmetals - Permeable sintered metal materials - Determination of density, oil content, and open porosity
GB/T 5330.1 Industrial wire screens and woven wire cloth - Guide to the choice of aperture size and wire diameter combinations - Part 1: Generalities
GB/T 5832.1 Gas analysis - Determination of moisture - Part 1: Electrolytic method
GB/T 5832.2 Gas analysis - Determination of moisture - Part 2: Dew point method
GB/T 6285 Determination of trace oxygen in gases - Electrochemical method
GB/T 13005 Terminology of gas cylinders
GB/T 28726 Gas analysis - Gas chromatograph with helium ionization detector
GB/T 29729 Essential requirements for the safety of hydrogen systems
GB/T 34542.1 Storage and transportation systems for gaseous hydrogen - Part 1: General requirements
GB/T 37244 Fuel specification for proton exchange membrane fuel cell vehicles - Hydrogen
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 13005 and the following apply.
3.1.1
plastic liner
inner plastic housing that is designed to withstand no pressure load and used for sealing the gas, with carbon fiber reinforced layer wrapped outside
3.1.2
seamless plastic liner
unibody plastic liner without splicing weld
3.1.3
welded plastic liner
plastic liner with splicing weld
3.1.4
blister
local defect in polymers that looks like a bubble
3.1.5
nominal working pressure
defined filling pressure of high pressure gaseous hydrogen cylinders at the reference temperature (15℃)
3.2 Symbols
For the purposes of this document, the following symbols apply.
B the thickness of disc specimen, m;
p the nominal working pressure of cylinder, MPa;
Pe the gas permeability coefficient of material, mol?m/(m2?s?Pa);
S the surface area of the specimen exposed to hydrogen during permeability test, m2;
Δp the pressure difference between the high-pressure side and the low-pressure side of the specimen during permeability test, Pa;
the transmission rate of gas at stable permeability, mol/s.
4 General requirements
4.1 Test for evaluating hydrogen compatibility of plastic liner of high pressure gaseous hydrogen cylinders include the plastic liner material test and cylinder liner test. Plastic liner material test includes hydrogen permeability test, physical property test, tensile property test, hydrogen cycling test and hydrogen aging test; cylinder liner test includes permeability test at extreme temperature, liner buckling and blister test. The test flow is shown in Figure 1.
4.2 The overall design, installation & commissioning and use management of the hydrogen compatibility test device shall be carried out in accordance with GB/T 29729 and GB/T 34542.1.
4.3 The hydrogen compatibility test device shall be free from impurities that can interact with the specimen or pollute the test environment.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 General requirements
5 Test conditions
6 Test methods
7 Test report
Annex A (Informative) Basic structure of main body of hydrogen permeability test device
