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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 2 System Components and Description
2.1 Cylinder Assembly
e cylinder assembly consists of the cylinder, dip tube, and cylinder valve.
2.1.1 Cylinder
e dry chemical agent is stored as a powder inside a welded steel cylinder. e cylinders are then pressurized
with dry nitrogen to a pressure of 500 psig (34.48 bar) at 70°F (21°C). Each cylinder is filled to its intended
capacity. (See Table 2.1.1 for a list of available capacities).
Standard domestic cylinders are manufactured according to the requirements of the U.S. Department
of Transportation (USDOT) and Transport Canada¹ (TC) for compressed gas and are fitted with an
identification label indicating the fill quantity of dry chemical agent. Each cylinder has internal neck threads
to allow for connection to the cylinder valve.
1 1000 lb Cylinders are not Transport Canada approved, but utilize DOT 4BW500 cylinders that are accepted in Canada.
Table 2.1.1 Cylinder Capacities
Valve
Series
Nominal
Cylinder
Size
P/N
Fill Options
App. Empty
Weight
lb kg lb kg
Mv 200 lb 26301 50, 100, 150, 200 22.7, 45.4, 68.0, 90.7 213 96.6
Mv 600 lb 25147
200, 250, 300, 350,
400, 450, 500
90.7, 113.4, 136.1, 158.8,
181.4, 204.1, 226.8
346 157.0
Lv 1000 lb 25148
200, 250, 300, 350,
400, 450, 500, 550,
600, 650, 700, 750,
800, 850, 900
90.7, 113.4, 136.1, 158.8,
181.4, 204.1, 226.8, 249.4,
272.1, 294.8, 317.5, 340.1,
362.8, 385.5, 408.2
766 347.4
Ordering Instructions: Specify the CylinderAssembly P/N followed by a dash and the ll weight in pounds ex-
pressed in three digits.
2.1.1.1 Rupture Disc
A frangible rupture disc is fitted to the Lv Series cylinder body. It functions as an emergency relief device in
the event of excessive internal pressure within the cylinder. Its rupture point is between 850 psi (58.6 bar)
and 1000 psi (68.9 bar).
is feature is not found on the Mv Series cylinder. Instead, a rupture disc is located on the side of the Mv
Series cylinder valve as detailed in section 2.1.3.1.
2.1.1.2 Pressure Vent Port
e pressure vent port is located on the cylinder body. It is used in conjunction with a cylinder venting kit
(P/N 97641) to release nitrogen from a filled cylinder in the event the agent fill port must be opened.
2.1.1.3 Agent Fill Port
e agent fill port is located at the top of the cylinder. It is used to fill the cylinder with ABC dry chemical
agent.
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