Table 8-4.Summary of Inspection and Test Frequencies for Gaseous Systems
Check CO2 and Halon nozzles and hand hose lines
Check liquid level in low-pressure CO2 storage tanks
Check devices and connections of low-pressure CO2 systems for
Test tank alarm pressure switch and identification device
Conduct actuating and operating tests of CO2 and Halon system
Hydrostatic test of cylinders and hoses
(See text for frequency)
. Weigh cylinders with a beam scale or with
reading on the liquid level gauge of all storage
a platform scale. To weigh with a platform scale,
tanks. Refill tanks when the quantity is less than
remove the cylinders completely from the rack and
the minimum required to protect the largest single
lift them on to the scale.
hazard, including any required reserve supply.
Monthly, check for leaks on all devices and
Test cylinders and hoses hydrostatically as
connections under continuous pressure, including
valve packing glands, screwed connections, and
Hydrostatically test cylinders to a minimum
pressure of 3,000 psi. The frequency for testing
is as follows:
. If discharged after 5 years from date of last
test, perform hydrostatic test.
. If not discharged after 12 years from date
of last test, discharge cylinder and perform
Hydrostatically test hoses to a minimum
pressure of 1,250 psi. The frequency of testing is
the same as for cylinders.
Carbon Dioxide Low-Pressure Systems
safety relief valves.
Semiannually, test the tank-alarm pressure
switch and the operation of the alarm bell or light
by reducing and increasing the pressure. Perform
this test as follows:
. Close valve on the piping from the vapor
space to the alarm pressure switch.
. Remove the test plug to reduce pressure.
l Increase pressure by connecting a high-
-pressure cylinder to the test opening. -
. After testing, disconnect the high-pressure
cylinder, replace the test plug, and reopen the
valve on the alarm pressure switch piping.
Check nozzles, pressure and level gauges, and
for leaks in all devices.
l If the bell or light fails to operate on the
Weekly, check to see that all nozzles are clear
pressure test, repair or replace, and test again.
and in the proper position and that all operating
Check the liquid level and pressure gauges for
controls are properly set. Check and record the
accuracy once each year.