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Part No. 715-0088, Rev. B
- 99 -
Purge Method 2:
1.
Install a shut-off valve on output of regulator.
2.
Install and tighten the regulator onto tank.
3.
Open regulator to allow flow through it.
4.
Close shut-off valve.
5.
Crack and immediately close the tank valve.
6.
Open shut-off valve and bleed pressure to 0, preferably to an external vent. Close
shut-off valve.
7.
Repeat steps 5 and 6 four more times.
8.
The tank valve may now be left open as needed.
9.
The regulator is now purged and ready to use.
Purge Method 3:
1.
Install and tighten regulator onto tank.
2.
Open regulator to allow flow through it.
3.
Crack open and immediately close tank valve and allow regulator to bleed down to
0, venting the gas to atmosphere.
4.
Repeat step 3 at least 5 more times to ensure that all air has been purged from
regulator.
5.
Connect to equipment and open the tank valve as needed.
Although not as elaborate as the previous two methods, this is far better than typical
practice of attaching a regulator, opening the tank valve, and starting to use it. Once a
regulator is installed on a tank, it should be left on the tank until the tank is empty to
minimize the chance of tank contamination.
CONTAMINATION EFFECTS OF AIR ON NO
2
FORMATION IN NO/N
2
Sample calculations to indicate the significance of contamination due to inadequate
purging procedures:
LARGE 2040 LITER (SIZE 2R) TANKS:
2040 Liter cylinder, 800 ppm NO in N
2
@ 2000 psi
Contains 1632 ml of NO, balance N
2
.
1 molecule of O
2
will convert 2 molecules of NO to NO
2
.
Volume of air trapped between tank valve and regulator body is typically 1.25 ml or more.
Conceivably, an additional 0.75 ml could be contained in the regulator body for a total of 2 ml.
Internal dimensions of regulator nipple: 0.18 dia 3.1 long = 0.079 in
3
= 1.29 ml
Internal dimensions of regulator nipple: 0.18 dia 3.5 long = 0.089 in
3
= 1.46 ml
Assuming 21% Oxygen in air, (.21 2 ml) = 0.42 ml of Oxygen will be
available.
This can convert 0.84 ml of NO to NO
2
.
0.84 ml represents [(0.84 / 1632) 100]% = 0.05% of the NO present in the tank.
0.05% of 800 ppm is 0.4 ppm.
Содержание AeroNO 2.0
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