Page: 64
FM-200® OPERATION, DESIGN, & SERVICE MANUAL
Revision F
Document # DOC102
Issued: February 1, 2009
Revised: 11-Nov-2011
40YE
Section 5 Commissioning System
5.2 Discharge Piping Pressure Test
Do not apply pressure to the discharge piping while the pipe is connected to the discharge outlet. Applying
pressure to the discharge outlet may cause the valve to open and pressurize the distribution pipe with the FM-
200® agent, causing personal injury or property damage.
NFPA 2001 mandates that all ttings be checked for tightness and pressure tested. Remove the nozzles
and install pipe caps. Remove the discharge piping from the cylinder valve and install the anti-recoil
safety device onto the cylinder discharge outlet. Connect a source of dry compressed air or nitrogen to the
distribution piping. Slowly increase the pressure in the piping to 40 psi (2.76 bar) and then close the valve
supplying pressure. Check the pressure after 10 minutes. If the pressure is above 32 psig (2.20 bar) (80%
of test pressure) the system is considered sealed. If it drops below 32 psig (2.20 bar) check and tighten all
ttings then re-run the test. After completing the test remove pipe caps, reinstall nozzles, and reconnect
discharge piping to cylinder.
Pressure testing may potentially cause a rupture of the piping system and introduce dangerous projectiles into
the protected area. Personnel should be evacuated prior to pressure testing.
NFPA 2001 allows this pressure test to be omitted if the total piping contains no more than one change in
direction between the cylinder outlet and the nozzle and all piping is physically checked for tightness.
Dry compressed air or nitrogen must be discharged through the piping network and nozzles to verify
the ow is continuous and that the piping and nozzles are unobstructed. Make certain air/nitrogen is
discharging from all nozzles.
Check all nozzles to be sure the correct nozzles are installed as shown on the installation drawing, installed
securely to the pipe, properly anchored, and properly oriented.
Check all nozzles for any obstructions or objects placed in the direct pattern of discharge.
Perform a full functional test of the control system in accordance with the appropriate technical manual and
system design drawings including verication that all control functions such as damper and door closure,
HVAC shut down, and power shut down occur as intended.
If the HVAC is NOT being shutdown prior to system discharge it must be of the re-circulating close loop
type and enough agent must be provided to compensate for the volume of the duct and plenum.
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