Liquid gas sampling

Patent 5195325 Issued on March 23, 1993. Estimated Expiration Date:

November 27, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3443028

3726085

Closed loop cryogenic delivery
Patent #: 3972202
Issued on: 08/03/1976
Inventor: Stearns

Controlled cryogenic liquid delivery
Patent #: 4715187
Issued on: 12/29/1987
Inventor: Stearns

Cryostat Patent #: 4773228
Issued on: 09/27/1988
Inventor: Murai , et al.

Inventors

Assignee

Praxair Technology, Inc.

Application

No. 799358 filed on 11/27/1991

US Classes:

62/50.2, With vaporizing of liquified gas downstream of storage62/50.7Specific conduit, valve, or coupling structure

Examiners

Primary: Capossela, Ronald C.

Attorney, Agent or Firm

Kent; Peter

International Class

F17C 009/02

Abstract

Apparatus and method for sampling of a liquified gas for composition analysis. A sample flow of liquified gas is induced into the open end of an admitting tube with sufficient length immersed in the liquified gas to avoid vaporization proximate the open end and in the admitting tube. Joined to the admitting tube is a conveying tube leading to an analyzer. The flow area of the admitting tube is in the range of from about 0.01 to about 0.5 times the the flow area of the conveying tube. In the proximity of the joint is a means for heating the conveying tube so as to vaporize the sample stream. The admitting tube penetrates and extends in a conduit through which, during sampling, liquified gas flows from a vessel containing the liquified gas to be sampled. During nonsampling, the liquified gas flow is valved off and vaporized liquid from the vessel is ducted to the portion of conduit contain in the admitting tube. The vapor enters the open end of the admitting tube and flows through the conveying tube preventing the entry of ambient air and moisture.