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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 6 System Inspection and Maintenance
6.2.1 Semi-Annual Maintenance
In addition to the monthly inspection steps, at least semiannually the agent quantity and pressure shall be
checked.
6.2.1.1 Pressure Check
Check the pressure indicated by the gauge and the temperature of the cylinder and compare with the Table
6.2.1.1 in Appendix B. If the gauge pressure is below the pressure shown in the “90% Pressure” column
for the temperature of the cylinder, the cylinder must be removed from service, agent recovered, all leaks
identified and repaired, and the cylinder refilled.
6.2.1.2 Cylinder Weighing
e cylinder shall be weighed on a calibrated scale and the weight compared to the weight stamped on the
cylinder label. When weighing the cylinder the anti-recoil safety plug or device must be installed in the
discharge outlet and the electric or pneumatic valve actuator must be removed from the cylinder valve and
the shipping cap installed on the top of the valve.
e maximum weight loss allowed is 5% of the fill weight (agent weight).
6.2.2 Annual Maintenance
In addition to the monthly inspection steps and semiannual maintenance the system shall be thoroughly
examined at least once each year.
A minimum of the following steps should be performed during the annual maintenance:
• Survey the hazard to determine if it has changed from what the system was designed to protect. While
surveying the hazard look for different fuels, loss of hazard integrity, new hazards, etc. If discrepancies are
found the changes must be noted and the system re-calculated to determine if the system is appropriate
for the existing hazard.
• oroughly inspect the perimeter of the enclosure for penetrations or openings that could adversely
affect agent leakage. Any openings found should be noted on the service report and sealed.
• Remove all actuators from cylinder valves and test for proper operation. Leave all actuators off until
service is completed.
Do not install the electric, pneumatic, or manual valve actuators until the system has been fully inspected.
Failure to comply could result in personal injury or death from violent cylinder movement or over-exposure to
high concentrations of agent.
• Examine the cylinder and valve assembly for any signs of damage, denting, corrosion, etc. as described
in NFPA 17. If any deficiency is identified the cylinder shall be hydrostatically tested.
• Check the cylinder bracket for corrosion or damage and make certain it is securely fastened to a rigid
vertical structure.
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