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MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
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 dry
chemical agent, causing personal injury or property damage.
Prior to the test described in the following paragraph, piping shall be physically checked for tightness.
Dry compressed air or nitrogen must be discharged through the piping network and nozzles in accordance
with NFPA 17 at a pressure not to exceed the normal operating pressure of the system (500 psi/34.48 bar)
to verify the flow is continuous and that the piping and nozzles are unobstructed. Make certain air/nitrogen
is discharging from all nozzles.
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.
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 verification 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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