Nitrogen gas at a pressure of 60 atmospheres and ambient temperature facilitates the calibration of turbine flowmeters used for monitoring the flow of liquid hydrogen in cryogenic systems. Full-scale calibration factors can be obtained to an accuracy of 0.4 percent

Krause, L. N.

Szaniszlo, A. J.

English

NASA Technical Reports Server

May 1968	 Brief 68-10145 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
High-Pressure Gas Facilitates Calibration of Turbine
Flowmeters for Liquid Hydrogen 
Nitrogen gas at a pressure of 60 atmospheres and 
ambient temperature permits accurate and relatively 
inexpensive calibration of turbine flowmeters used for 
monitoring the flow of liquid hydrogen in cryogenic 
systems. The effectiveness of 60-atmosphere nitrogen 
gas as a meter calibration fluid for liquid hydrogen 
has been experimentally established, for three different 
internal configurations of 1.5-inch turbine flowmeters. 
The experimental measurements show that full-scale 
calibration factors can be obtained to an accuracy of 
0.4 percent. Typical meter repeatability obtained with 
the nitrogen gas for a 95 percent confidence band is 
±0.3 percent. All of the accuracy values include an 
analytically derived thermal-correction factçr for non-
zero blade clearance. 
Notes: 
Calibration of turbine flowmeters using liquid 
hydrogen itself as the working fluid is both time 
consuming and costly.
For the majority of flowmeters tested, liquid 
hydrogen calibrations were more accurately simu-
lated by using the high-pressure nitrogen gas 
rather than water as the test fluid (see Tech Brief 
67-10506). 
Complete technical details are given in NASA TN 
D-3773, "Simulation of Liquid-Hydrogen Turbine-
Type Flowmeter Calibration Using High-Pressure 
Gas," by A. J. Szaniszlo and L. N. Krause, Decem-
ber 1966, available from the Clearinghouse for 
Federal Scientific and Technical Information, 
Springfield, Virginia 22151. Inquiries may also be 
directed to: Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B68-10145 
Patent status: 
No patent action is contemplated by NASA. 
Source: A. J. Szaniszlo and L. N. Krause 
(LEW- 10402) 
Category 01 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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High-pressure gas facilitates calibration of turbine flowmeters for liquid hydrogen

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