Dry gas purging with Nitrogen Purging Systems removes moisture and creates low dew points within sensitive equipment.
A Nitrogen Enhanced Purging System (NEPS), like the NEPS 1000, is a single-point device used to pressurize and purge airspace with nitrogen or other dry gas. As a single-point system, our NEPS 1000 Advantage Purge System is more efficient and delivers a better purge. This system is available in either a transportable case or a rack-mount unit.
The single-point purge of the NEPS 1000 is superior to a standard two-point purge as it uses the nitrogen, or dry gas, more efficiently, thereby purging the equipment more quickly and sparing the additional expense of wasted gas. The single point feature of the NEPS 1000 also provides a dew point temperature measurement for the gas stream leaving the equipment.
As a dry, inert gas, nitrogen displaces oxygen and the moisture it contains. Purging an enclosure with nitrogen essentially replaces the internal atmosphere with a dry atmosphere.
Dry nitrogen can be supplied to equipment through purging (venting of purge gas) or the more effective single-point pressure purging (NEPS). Nitrogen is generally a reliable dry gas, which is economic, safe (when handled properly) and chemically inert with most metals and materials. Dry nitrogen can also be supplied from bottles, cryogenic factories or nitrogen generators.
In the early years of air separation, oxygen was the most sought-after component for use in the steel industry. This situation began to change when nitrogen was no longer considered a waste product and its inert properties could be exploited as a blanketing gas. Dry nitrogen can be supplied from bottles, cryogenic factories or nitrogen generators.
Today, nitrogen is used in a host of applications, including:
Purging and blanketing are probably the most popular uses of nitrogen gas. Tanks filled with hydrocarbon liquids have vapor space at the top of the tank, which collects hydrocarbon vapors. In atmospheric tanks, air can be drawn in when emptying the tank and it would be easy to ignite this by static electricity or friction. Purging the vapor space with nitrogen prevents this.
Bottled nitrogen is often specified as dryer than 2 ppm (parts per million) equivalent to a dew point of -94°F (-70°C). The gas source for drying should always be validated before use. As a rule of thumb the gas must be at least 10°C lower than required purge dryness.
60 Minutes to degrade by 0.01 psi
1,000 cc volume = 1.9 x 10-4 cc/second
10,000 cc volume = 1.9 cc x 10-3 cc/second
CAUTION: Leak testing must be conducted with a stable/constant ambient/equipment temperature. A variation of 3.6°F (2°C) can cause up to a 0.1 psi change in pressure.
AGM Container Controls, Inc.
3526 E. Fort Lowell Rd.
Tucson, AZ 85716