Evaluations of five types of steel for use in high pressure pneumatic piping systems include tests for impact strength, tensile and yield strengths, elongation and reduction in area, field weldability, and cost. One type, AISI 4615, was selected as most advantageous for extensive use in future flight vehicles

Loeb, M. B.

Smith, J. C.

English

NASA Technical Reports Server

November 1967	 Brief 67-10437 
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. 
Study Made of Pneumatic High Pressure Piping Materials (10,000 psi) 
The storage and transfer of purging and pressuriz-
ing media (nitrogen and helium) require high pressures 
for increased efficiency. These media are presently 
stored and transferred in the 6000 psi range. The 
continuous development of new and larger flight ve-
hicles requires that these media be handled at much 
higher pressures. This increase in pressure requires 
additional piping system strength. To meet these and 
other criteria, a study program was initiated to de-
velop and test new 10,000 pound high pressure piping 
materials. 
The basic system requirements for the new tubing 
material are: (I) good weldability; (2) yield strength 
75,000-90,000 psi; (3) ultimate strength 90,000-
110,000 psi; (4) elongation 17% minimum; (5) charpy 
V-notch 15 ft/lb minimum at —150°F; (6) costs of 
the new material should be competitive with presently 
available materials. 
The steels selected for testing were: AISI 4320 (5% 
nickel); AISI 4320 (3-1/2% nickel); AISI 4615; AISI 
8615; and AISI 9310. Each of these steels was eval-
uated for use in high pressure pneumatic piping 
systems in accordance with the following criteria: 
impact strength; tensile and yield strengths; elonga-
tion and reduction in area; field weldability; and cost.
The test results showed that both AISI 4615 and AISI 
9310 are equal to, or better than AISI 4320 at 10,000 
pounds and temperatures from ambient to —150°F. 
AISI 4615 would be most advantageous for extensive 
use, since the cost is lower than AISI 4320, and much 
lower than AISI 9310. 
Notes: 
1. Complete details of this study are contained in 
the Boeing Company New Technology Report 
BATC No. 65, Technical Data on Pneumatic High 
Pressure Piping Materials, by J. C. Smith and 
M. B. Loeb, May 15, 1967. 
2. Copies of this report are available from: 
Technology Utilization Officer 
Kennedy Space Center 
Kennedy Space Center, Florida 32899 
Reference: B67-10437 
Patent status: 
No patent action is contemplated by NASA. 
Source: Jesse C. Smith and Marx B. Loeb 
of The Boeing Company 
under contract to 
Kennedy Space Center 
(KSC-10 133) 
Category 03 
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=19670000437 2020-03-11T21:13:57+00:00Z


Study made of pneumatic high pressure piping materials /10,000 psi/

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