Technique measures leakages of high pressure test specimens occurring on the input rather than the output side of a test specimen. Technique involves paralleling-off the pressure supply line and duplicating and measuring the leakage flowing into a specimen rather than attempting to measure the leakage flowing out of it

Clausen, H. J.

English

NASA Technical Reports Server

September 1969	 Brief 69-10438 
U	 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., 
U
Pressure 
Source 
=	 _' l 
iI
Leakage Measuring Method 
01
-- - - - 
-0. - - - - ,
(1
	
Multiple 
- Leakage Flow 0
kVy	 Leaks 
Specimen
Test 
Duplicated 
Leakage Flow 
The problem: 
To measure leakages of high pressure test speci-
mens by paralleling-off the pressure supply line and 
duplicating and measuring the leakage flowing into 
a specimen rather than attempting to measure the 
leakage flowing out of it. Normally, a rotometer is 
placed in the pressure supply line to measure leakage, 
but this covers only a narrow range of leakage rates 
for each size of flow tube and float combination. 
The solution: 
A technique to measure leakages of high pressure 
test specimens occurring on the input rather than the 
output side of a test specimen. 
How it's done: 
A shutoff valve (1) is located in the pressure supply 
line to direct the leakage flow through the parallel
leak-test setup (see fig.). To measure the leakage, 
operating pressure is applied to the system while 
valves (2), (3), and (4) are open and valves (1) and 
(5) are closed. With the specimen leakage flow pass-
ing through valve (4), a differential pressure is set up 
across this valve by adjusting it towards the closed 
position until the desired reference reading appears 
on the gage (6). This may be any arbitrary reading in 
the mid-scale range of the gage. Leakage flow to the 
specimen is now shut off at valve (3) and a duplicate 
leakage flow is set up to the leakage-measuring de-
vice by gradually opening valve (5). Valve (5) is 
adjusted until the previous differential pressure has 
been re-established on the gage (6) with valve (4) 
unchanged. Duplicate leakage is then measured from 
the outlet of valve (5) by conventional equipment 
operated at atmospheric pressures.
(continued overleaf) 
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=19690000429 2020-03-16T18:01:34+00:00Z
Notes: 
1. A check valve (7), with an appropriate opening 
pressure protects the differential pressure gage. 
2. No further documentation' is available. Inquiries 
may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B69-10438
Patent status: 
No patent action is contemplated by NASA. 
Source: Hans J. Clausen of 
Douglas Aircraft Company, Incorporated 
under contract to 
Marshall Space Flight Center 
(M FS- 14722)
. 
. 
Brief 69-10438.	 Category 01


Leakage measuring method

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