Matting cover thermally insulates cryogenic-liquid transfer pipelines. The matting consists of layers of commercially available fiber glass tape in which the fibers are randomly oriented in parallel planes

Lindgren, A. R.

English

NASA Technical Reports Server

August 1966
	
Brief 66-10348 ¶7	 NASA TECH BRIEF 
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. 
Inexpensive Insulation Is Effective for Cryogenic Transfer Lines 
The problem: 
To provide a low cost thermal insulation for cry-
ogenic-liquid transfer pipelines. 
The solution: 
Cover the transfer pipeline with a matting consisting 
of layers of commercially available fiberglass tape in 
which the fibers are randomly oriented in parallel 
planes. 
How it's done: 
The surface of the pipe is coated with a suitable 
adhesive, and the fiberglass tapes are laid up longi-
tudinally or wrapped spirally on the coated pipe. 
Because of the construction of the tape, all of the 
fibers will lie in concentric cylindrical shells parallel 
to the surface of the pipe, and thus offer greater 
thermal resistance than randomly oriented fibers 
(which include radial orientation) as in wrapped con-
ventional fiberglass insulation. The insulation is com-
pressed to a density of approximately 10 pounds per 
cubic foot when the outer metal pipe jacket is pulled 
over it.
For optimum operation of the system, the insula-
tion is purged of all gases and then backfllled with 
carbon dioxide at a pressure of 3 psig. Cryopumping 
(condensation of the carbon dioxide) at the interface 
between the outer surface of the transfer pipe and the 
inner surface of the fiberglass reduces the carbon 
dioxide pressure to approximately 1 micron of mer-
cury, thus minimizing convective and radiative heat 
transfer. 
Note: 
Inquiries concerning this innovation may be di-
rected to:
Technology Utilization Officer 
Manned Spacecraft Center 
Houston, Texas 77058 
Reference: B66-10348 
Patent status: 
No patent action is contemplated by NASA. 
Source: Arnie R. Lindgren 
of North American Aviation, Inc. 
under contract to 
Manned Spacecraft Center 
(MSC-618) 
Category 02 
-.
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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Inexpensive insulation is effective for cryogenic transfer lines

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