US11920732B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11920732-B2 |
| Application number | US-202016806427-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 2, 2020 |
| Priority date | Aug 23, 2019 |
| Publication date | Mar 5, 2024 |
| Grant date | Mar 5, 2024 |
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A quality control method for the preparation of dry compressed gas cylinder including passivating and/or preparing the compressed gas cylinder with the technique to be validated, filling the passivated/prepared compressed gas cylinder with gaseous carbon dioxide to a normal working pressure, wherein the gaseous carbon dioxide has a known δ18O isotope ratio, maintaining the pressurized gas cylinder at ambient temperature for a first predetermined period of time, and gradually emptying the pressurized gas cylinder, while simultaneously measuring the δ18O isotopic ratio, wherein a predetermined variation in the measured isotopic ratio of δ18O indicates a properly prepared cylinder.
Opening claim text (preview).
What is claimed is: 1. A quality control method for preparing a dry compressed gas cylinder comprising: a) preparing the compressed gas cylinder with the technique to be validated, b) filling the prepared compressed gas cylinder with gaseous carbon dioxide to a normal working pressure, wherein the gaseous carbon dioxide has a known δ 18 O isotope ratio, c) maintaining the compressed gas cylinder at a first temperature for a first predetermined period of time, d) gradually emptying the compressed gas cylinder, while simultaneously measuring the δ 18 O isotopic ratio, wherein a predetermined variation in the measured isotopic ratio of δ 18 O of a standard deviation of less than 0.1‰, indicates a properly prepared cylinder. 2. The quality control method of claim 1 , wherein the gaseous carbon dioxide has a natural δ 18 O isotope ratio. 3. The quality control method of claim 1 , wherein the first predetermined period of time is between 6 hours and 100 days. 4. The quality control method of claim 1 , wherein the first predetermined period of time is 75 days or greater. 5. The quality control method of claim 1 , further comprising: c1) inverting and/or agitating the cylinder, thereby ensuring complete mixing. 6. Storing isotopically prepared mixtures in a prepared compressed gas cylinder validated by the quality control method of claim 1 . 7. Storing corrosive gas mixtures in a prepared compressed gas cylinder validated by the quality control method of claim 1 . 8. The method of claim 1 , wherein the compressed gas cylinder internal preparation comprises simultaneously exposing the cylinder to a desiccating temperature and a vacuum for a defined period of time. 9. The method of claim 8 , wherein the vacuum is less than 20 microns. 10. The quality control method of claim 1 , further comprising: c2) heating the cylinder for a second predetermined period of time, at a second predetermined temperature based on the metallurgy of the cylinder. 11. The quality control method of claim 10 , wherein the second predetermined temperature is less than 177 C, for an aluminum cylinder. 12. The quality control method of claim 10 , wherein the second predetermined temperature is less than 260 C, for a steel cylinder. 13. The quality control method of claim 7 , wherein the second predetermined period of time is between 2 days and 60 days. 14. The quality control method of claim 10 , wherein the second predetermined period of time is greater than 5 hours.
Special adaptations of indicating, measuring, or monitoring equipment (measuring in general G01) · CPC title
for filling with compressed gases · CPC title
Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass · CPC title
Investigating permeability, pore-volume, or surface area of porous materials · CPC title
Gaseous mixtures, e.g. polluted air · CPC title
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