4-14
90-FM200M-000 September 2004
FM-200
®
ECS Series Engineered Fire Suppression Systems
4-3.2.2.1 Ferrous Piping
Black steel or galvanized pipe must be either ASTM A-53
seamless or electric resistance welded, Grade A or B, or
ASTM A-53 furnace weld Class F (up to 1½ diameter) or
ASTM A-106, Grade A, B or C. ASTM B-120 and ordinary
cast iron pipe must not be used. The thickness of the pipe
wall must be calculated in accordance with ANSI B-31.1,
Power Piping Code. The internal pressure for this calcula-
tion shall not be less than the minimum piping design pres-
sure of 402 PSIG (28 bar gauge) at 70°F (21°C). The
minimum piping design pressure of 402 PSIG at 70°F cor-
responds to eighty percent of the maximum pressure of
502 PSIG (35 bar gauge) in the agent container at the maxi-
mum storage temperature at 130°F (54°C), using the maxi-
mum allowable fill density at 70 lb./cu.ft. (1121 kg/cu.m).
CAUTION
!
Pipe supplied as dual stenciled A-120/A-53
Class F meets the requirements of Class F
furnace welded pipe ASTM A-53 as listed above.
Ordinary cast-iron pipe, steel pipe conforming
to ASTM A-120, or nonmetallic pipe must not
be used.
4-3.2.2.2 Piping Joints
The type of piping joint shall be suitable for the design con-
ditions and shall be selected with consideration of joint tight-
ness and mechanical strength.
4-3.2.2.3 Fittings
Fittings shall conform to the requirements of NFPA 2001,
Sections 2-2.3 and A-2-2.3.1. Class 150 and cast iron fit-
tings must not be used. Class 300 lb. malleable or ductile
iron fittings in sizes 3-inch and smaller, or 1000 lb. ductile
iron or forged steel fittings in sizes greater than 3-inch are
to be used. Class 300 flanged joints are acceptable for use
in all sizes. All grooved couplings and fittings shall be
UL Listed and/or FM Approved (as appropriate) and have a
minimum rated working pressure equal to or greater than
the minimum piping design pressure of 402 PSIG (28 bar
gauge) at 70°F (21°C).
Concentric bell reducers are the only means for reducing
pipe size. Reductions can be made after a tee or after a
union. Where reducers are used at tees, the reducers must
be downstream of each tee. Reductions made after a union
are possible only if the next change in direction (tee split) is
located a minimum of 15 nominal pipe diameters down-
stream of the concentric bell reducer. Gaskets for flanged
fittings shall be flat gray asbestos, neoprene impregnated.
CAUTION
!
The calculation software has only been
verified for use with the piping, inside pipe
diameter and fittings specified in this manual.
When unspecified piping and fittings are used
for unbalanced systems, there is a risk that
the system will not supply the required
quantity of FM-200.
4-3.3 Installation of Pipe and Fittings
Pipe and fittings must be installed in strict accordance with
the system drawings and good commercial practices. The
piping between the cylinder and the nozzles must be the
shortest route possible, with a minimum of fittings. Any de-
viations in the routing or number of fittings must be ap-
proved by the design engineer before installation.
Note: Strict piping rules regarding flow splits to mul-
tiple hazards must be adhered to. Please refer
to Paragraph 4-2.3.2 of this manual for proper
tee installations.
Piping must be reamed free of burrs and ridges after cut-
ting, welding or threading. All threaded joints must conform
to ANSI B1-20-1. Joint compound or thread tape must be
applied only to the male threads of the joint, excluding the
first two threads. Welding must be in accordance with Sec-
tion IX of the ASME Boiler and Pressure Vessel Code. Each
pipe section must be swabbed clean, using a non-flam-
mable organic solvent.
All piping must be blown clear with dry nitrogen or com-
pressed air before installing the discharge nozzles.
The piping must be securely braced to account for discharge
reaction forces and thermal expansion/contraction. Care
must be taken to ensure the piping is not subjected to vi-
bration, mechanical or chemical damage. All hangers must
be UL Listed, must conform to general industry standards
for pipe hangers and conform to ANSI B-31.1. Refer to ANSI
B-31.1 for additional bracing requirements.
4-3.4 Installation of Check Valves
Install the check valves as shown on the system drawings.
Apply Teflon
®
tape or pipe compound to all the male threads,
except the first two threads. Valves greater than two inches
in size are provided with flanged outlets. All valves must be
installed with the arrow on the valve body pointing in the
proper direction of the flow.
4-3.5 Installation of Discharge Nozzles
After the system piping has been blown free of debris, install
the discharge nozzles in strict accordance with the system
drawings. Orient the nozzles as shown on drawings. Make
certain that the correct nozzle type, part number and orifice
size are installed in the proper location. See Paragraph
4-2.3.5 for correct nozzle placement and orientation.
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