Large diameter seals are fabricated from narrow strip stock welded in segments to form a complete ring. This technique could be used to reduce the cost of critical, large diameter seals in the heating and ventilating industry, petrochemical industry, and marine fabrication industry

Daniels, C. M.

Hanes, V. D.

English

NASA Technical Reports Server

October 1966	 Brief 66-10464 
NASA TECH BRIEF	 /W 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Large Seals Fabricated from Small Segments Reduce Procurement Lead Time 
The problem:	 2. 
Static seals for certain applications requiring large 
diameter closures are found to involve long procure-
ment lead time and high cost due to a design re-
quirement that they be fabricated from large nickel 
alloy sheet stock.	 3. 
The solution: 
Large diameter seals (greater than 25 inches in 
diameter) are fabricated from narrow strip stock •
welded in segments to form a complete ring. 
How it's done: 
TIG (Tungsten inert gas) welding is used to join 
several segments of nickel alloy strip stock that are 
cut and rolled to the proper contour. After welding, 
the rough ring is stress relieved and finish machined. 
Notes: 
1. One seal, so fabricated, has been subjected to 32 
hotfire starts totaling 4519 seconds elapsed time 
in an application as seal between turbine and 
heat exchanger in the Saturn F-i rocket engine.
This technique could be used to reduce the cost 
of critical, large diameter seals in the heating and 
ventilating industry, petrochemical industry, and 
marine fabrication industry (large commercial 
and military craft). 
Inquiries concerning this innovation may be di-
rected to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B66-10464 
Source: C. M. Daniels and V. D. Hanes 
of North American Aviation, Inc. 
under contract to
Marshall Space Flight Center 
(M-FS-1 117) 
Patent status: 
No patent action is contemplated by NASA. 
Category 05 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Large seals fabricated from small segments reduce procurement lead time

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