Echometer Company
Model – M Manual
Phone: (940) 767-4334
5001 Ditto Lane
Page
43
Fax: (940) 723-7507
Wichita Falls, Texas 76302, U.S.A.
E-Mail:NITROGEN INFORMATION (N
2
)
Nitrogen comprises approximately 79
0
/
0
by volume of the air. It is found chemically combined in many forms in nature.
Nitrogen will not burn and will not support combustion. Nitrogen is normally available in cylinders compressed to 2200-psi.
Nitrogen is used as an inert gas in electrical systems, the chemical industry, and in the food packaging industry. Nitrogen,
also finds extensive use as an inert atmosphere and in the filling of some incandescent lamps.
Nitrogen is nontoxic but can asphyxiate human beings and animal life by displacing the necessary amount of oxygen in the air
to sustain life.
ACOUSTIC LIQUID LEVEL DEPTH MEASUREMENT CONSIDERATIONS
Generally, a pressure regulator should be used with N
2
since the initial cylinder pressure is 2200-psi, which is normally in
excess of the wellhead pressure rating or the maximum rating of some of the pressure gauges.
During pressure buildup testing, the pressure regulator should be set so that the pressure in the volume chamber will exceed
the pressure on the casing annulus when the operator returns to check the equipment. Less gas will be used if the pressure
regulator is set to a lower value.
HANDLING PRECAUTIONS
Never drop cylinders or permit them to strike each other violently.
Never tamper with safety devices in valves or cylinders. See your local gas supply dealer for other precautions.
PHYSICAL CONSTANTS
Molecular Weight
28.016
Density @ 70
o
F, 1-atm
0.17247 lb/cu ft
Critical Temperature
-232.87
o
F (-147.15
o
C)
Critical Pressure
492.45-psia (33.5-atm)
Specific Volume @ 70
o
F, 1-atm
13.8 cu ft/lb or 31,000 cu in/lb