[DOC] [TLE] Patent US3809898 - Method of detecting aircraft fuel line leaks with ... [PAR] Method of detecting aircraft fuel line leaks with radioactive gas tracers ... 250/106 
T X [451 May 7, 1974 3,370,173 2/1968 Ackerman et al. .... These gases are inert, 
require no chemical synthesis, may be used as supplied, have sufficient... [DOC] [TLE] LEAK DETECTION METHODS AND DEFINING THE SIZES OF LEAKS [PAR] Keywords: tightness, leakage, trace gas, helium mass spectrometer leak ... 
Tipical products in which the leak detection has to be used are: vacuum ... 
technique, which is not really a leak but is the internal source of gas or vapor. ... 
This simple test helps us to describe the situation at the begining of leak tracing 
procedure. [DOC] [TLE] Helium Leak Test at 950C - NDT.net [PAR] The test specimens were exposed to helium flowing through thin pipes leading 
outwards. ... However, leaks of this magnitude are not permissible for almost any 
technical ... For gases with their smaller atoms, however, leaks of this size are still 
huge holes ... Helium is used as the tracer gas for detecting these small leaks. [DOC] [TLE] leakdetection-technology.com [PAR] Gas consists of a large number of particles (atoms, molecules) which are 
permanently ... The unit, in which the pressure is measured, is the Pascal (Pa = N
/m2, ... This value comes from the older, and no longer used unit the Torr (760 
Torr ...... But since the leak test method with the tracer gas helium and the 
detection of this... [DOC] [TLE] Leak Detection Methods - ThomasNet [PAR] their characteristics and sensitivity, can be used only for gross leak detection (
300 ..... The term tracer gas leak testing describes a group of test methods ... 
vent away, and its molecules do not stick to surfaces as easily as helium atoms. 
.... the detector is linked to the vacuum line so as to detect the tracer gas flow 
through. [DOC] [TLE] Helium - Wikipedia [PAR] Helium is a chemical element with symbol He and atomic number 2. It is a 
colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first ... It was 
first detected as an unknown yellow spectral line signature in sunlight during a .... 
Some of this gas was used in the world's first helium-filled airship, the U.S. Navy's 
C-7,... [DOC] [TLE] Advanced Tracer Technique Enhances Leak Detection.tif [PAR] makes use of SF6 as a tracer where leak rates are extremely low and ... chemical 
analysis, and even tracing with ... suitable gas into the bulk cooling water and ... 
the company has used the technique to ... line measurements, it could not detect 
a .... 2. Injection the lower half of the water- the tubesheet. While SF6 tracing at... [DOC] [TLE] Natural Gas Leak Detection in Pipelines - National Energy ... [PAR] Page 2 ... various leak detection methods used in the natural gas pipelines. ... 
unable to detect small leaks that do not produce acoustic emissions at levels ... 
chemical. This tracer chemical will seep out of the pipe in the event of a leak. This 
is... [DOC] [TLE] Tracer Gas Leak Detection for the Automotive Industry [PAR] Page 2 ... Helium / Diluted hydrogen as a tracer gas.  Tracer Gas Advantages. ... 
Is used to pinpoint or measure the total leak from a system (global test).  
Measures actual gas leakage not a derivative.  Vacuum ... Di-atomic nature 
means it dissipates fast. .... Sensors.  Heat exchangers.  Compressors.  Igniters. 
 Gas lines. [DOC] [TLE] american gas & chemical co Leak Testing Large Containers [PAR] The pipeline was not leak tested, instead the most sophisticated methods of 
traditional ... testing used for the detection (location or measurement) of fluid 
leakage in either a ... Sand in hour glass, 1 x 102 ... Gas from a pipe line, 1 x 10-5 
... This method makes use of a tracer gas, usually ammonia, on the inside of the 
vessel... [DOC] [TLE] american gas & chemical co PiNPOiNT Colormetric Leak Testing [PAR] Colormetric Leak Detection, the primary topic of this report, is

Question: This gas, atomic No. 2, is used as a tracer in detecting leaks in gas lines
Answer: helium