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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 4 System Installation
4.1.2 Installing Discharge Piping
Discharge pipe, fittings, brackets, and hangers are not normally supplied by Janus Fire Systems and must
be provided by installer. Materials should be new and free from rust and corrosion. Pipe size, schedule,
routing, reductions, changes in elevations, etc must be in accordance with the drawings and in accordance
with calculations performed using the Janus Design Suite® software. Any deviations in routing or fitting
quantities must be coordinated and verified by the system designer prior to implementing changes.
Pipe must comply with NFPA 17 and be either Schedule 40 or 80. Pipe can be of any of the following
fabrication classifications.
Seamless - Round pipe without a longitudinal seam.
Electric Resistance Welded (ERW) - Pipe with a longitudinal joint where fusion of the joint is produced
by the heat obtained from the resistance to the flow of electric current.
Furnace Butt Welded Pipe (Welded Pipe) - Pipe fabricated by mechanical pressure developed by drawing
the furnace heated metal through a conical die that serves to form and weld the tubular shape.
Refer to Table 4.1.2 for acceptable pipe grades.
Cast iron pipe, steel pipe conforming to ASTM A-120, aluminum pipe, or non-metallic pipe shall not be used.
4.1.2.1 Threaded Pipe
At a minimum threaded pipe joints must be reamed free of burrs and obstructions. Any lubricants used in
the threading process must be cleaned from the ends of the pipe to reduce the chance of cutting lubricant
or shavings entering the nozzle orifices or being deposited in ceilings or equipment. readed joints must
conform to ANSI B1-20.1. Pipe sections should be swabbed with appropriate nonflammable degreasing
solvent to remove any traces of preservatives or lubricant.
Prior to fit up dry compressed air or nitrogen can be used to “blow out” any debris left in the pipe bore
during the cleaning process.
Pipe thread compound or tape shall not be used.
4.1.2.2 Threaded Fittings
readed fittings must comply with NFPA 17 and be at a minimum class 300 malleable iron, class 300
ductile iron, or have a minimum rated working pressure of 500 psi (34.48 bar) at 70°F (21.1°C).
Table 4.1.2 Acceptable Pipe Grades
Seamless Grade A-53 A or B, Grade A-106 A or B or C
Electric Resistance Welded (ERW) Grade A-53 A or B
Furnace Welded Grade A-53 F - 3/8" (10 mm) to 4" (100 mm) Pipe Sizes
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