INERT AIR (N2) SYSTEM MANUAL
Inert Air (N2) Systems are manufactured and distributed by Waukesha
®
Service & Components, a division of SPX Transformer Solutions, Inc.
N2-Manual, REV 2.16, 11/2/2019
12
MAINTENANCE
Inert air systems are shipped with the system tested and operational. To make certain that all components
are functioning properly, the system should be checked according to the following schedule:
First Week — Check daily (minimum)
Second through Fourth Week — Check once per week (minimum)
After Fourth Week — Check as required by utility maintenance program and record with dates and
times noted. Readings showing consistency indicate the equipment is operating properly.
Parameters to be checked include supply cylinder pressure, transformer tank pressure, transformer oil
temperature and ambient temperature.
Nitrogen Gas Cylinder Replacement
The cylinder that should be used is a standard, commercially available, 244 cu. ft. nitrogen gas cylinder
pressurized to 2000 psi. Replacement cylinders should meet all required pressure vessel specifications and
be filled with oil pumped nitrogen or nitrogen with a certified moisture content of less than 0.03 percent by
weight. The impurity content must be less than 7.5 parts per million.
Nitrogen consumption is dependent on transformer load variations and on the condition of the gas
pressurizing equipment. Cylinder must be replaced when the supply pressure gauge reads 200 psi or
below.
The factory set point for the low bottle alarm is 200 PSIG.
To Replace the Cylinder:
1)
Close transformer inlet valve.
2)
Turn the Low Bottle Alarm Enable Switch to the OFF position.
3)
Close the supply cylinder shutoff valve.
4)
Release the union connection and remove the empty cylinder.
5)
Position the replacement cylinder and make the connection.
Do not tighten more than finger tight.
6)
Open the shut-off valve on the replacement cylinder very slightly. Allow escaping gas to leak past the
loose union connection and blow away any loose dirt, and then tighten the connection with a wrench
until leakage stops.
7)
Open transformer inlet valve.
8)
Turn the Low Bottle Alarm Enable Switch to the ON Position.
REPLACEMENT PARTS AND SERVICE
Please contact your local sales representative or authorized distributor for replacement parts
and/or service, or visit us online at
. For technical support, call
us at 800-338-5526.