Computer program calculates actual and useable remaining propellant quantities as required in positive expulsion rocket engine propellant feed system. Program establishes relationship between helium system pressures and temperatures and propellant weight remaining in tanks. Program is written in FORTRAN 4 for IBM-360 computer

Cox, G. R.

Reynolds, R. G.

English

NASA Technical Reports Server

May 1971	 Brief 71-10130 
NASA TECH BRIEF 
Manned Spacecraft Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield,' Virginia 22151. Requests for individual copies or questions relating to the. Tech Brief program may 
be directed to the Technology. Utilization Office, NASA, Code KT, Washington, D. f. 20546. 
CSM Programs SM RCS Propellant Quantity Gaging Systems Program 
is
The problem: 
To calculate actual and useable remaining propel-
lant quantities in a positive expulsion rocket engine 
propellant feed system. 
The solution: 
A computer program which calculates the actual 
and useable remaining propellant quantities as re-
quired. 
How it's done: 
The program uses the real gas equation PV = 
ZWRT, along with system pressure and temperature 
data, to establish a relationship between the helium 
system pressures and temperatures and the weight 
of propellant remaining in the tanks. Subroutines 
within the program are used to calculate propellant, 
pressurant, and system dependent, variables, such as 
propellant densities, propellant vapor pressure, helium 
compressibility factor, and helium bottle volume as a 
function of internal pressure.
Notes: 
1. This program is written in FORTRAN IV for the 
IBM-360 computer. 
2. Requests for further information may be directed 
to:
COSMIC 
Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: B71-10130 
Patent status: 
No patent action is contemplated by NASA. 
Source: G. R. Cox and R. G. Reynolds 
North American Rockwell Corp. 
under contract to

Manned Spacecraft Center 
(MSC-17308) 
Category 09 
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.
https://ntrs.nasa.gov/search.jsp?R=19710000129 2020-03-17T02:22:53+00:00Z


CSM programs SM RCS propellant quantity gaging systems program

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