Janus FM-200 Sv Series - 3.6 Pipe Determination

Page: 43
FM-200® OPERATION, DESIGN, & SERVICE MANUAL
Revision F
Document # DOC102
Issued: February 1, 2009
Revised: 11-Nov-2011
40YE
Table 3.6 - Pipe Size vs. Flow Rate
Schedule
40 Pipe Size
Nominal
Inches (mm)
Minimum Flow
Rate For All
Sections Leading
to a Tee
60% of Flow Rate
For All Sections
Ending with a
Nozzle
Lbs/Sec Kg/Sec Lbs/Sec Kg/Sec
3/8 (10) .775 .352 .465 .211
1/2 (15) 1.29 .585 .774 .351
3/4 (20) 2.27 1.03 1.36 .617
1 (25) 3.65 1.65 2.19 .993
1 1/4 (32) 6.34 2.88 3.80 1.72
1 1/2 (40) 8.73 3.96 5.24 2.38
2 (50) 14.91 6.76 8.95 4.06
2 1/2 (65) 22.03 9.99 13.22 6.00
3 (80) 35.67 16.18 21.40 9.71
4 (100) 64.64 29.32 38.78 14.63
6 (150) 143.27 64.99 85.96 39.00
NFPA 2001 mandates that agent shall not directly impinge on areas where personnel could be found in the
normal work area and that agent shall not directly impinge on loose objects or shelves, cabinet tops, or similar
surfaces where loose objects could be present and become airborne during discharge.
Flow calculations have been veried at an ambient temperature of 70°F (21.1°C). Storage outside of the range
of 70°F ±10° (21.1°C ±5.5°) may result in inaccurate ow calculations and cause one or more nozzles to not
discharge the designed quantity of FM-200®.
Flow calculations have been veried for specic types of ttings, pipe and pipe ID. Failure to maintain the veried
limitations as stated in the Janus Design Suite® Flow Calculation Software Manual may result in inaccurate ow
calculations and cause one or more nozzles to not discharge the designed quantity of FM-200®.
Section 3 System Design
All nozzles: Discharge nozzles must be located at or near the ceiling with the centerline of the orices no
more than 4 ft (1.2 m) below the ceiling. e maximum height for a single tier of nozzles is 16 ft (4.88 m)
from oor to ceiling. For ceiling heights greater than 16 ft (4.88 m), additional tiers may be installed so that
the maximum distance between the oor and lowest row does not exceed 16 ft (4.88 m) and the maximum
distance between rows does not exceed 16 ft (4.88 m). Each nozzle must be positioned vertically, installed
either on the bottom or top of a vertical pipe section and should be placed as close to the cylinders as
possible to minimize system piping. e ceiling tiles around each nozzle must be clipped to hold them in
place during a discharge and to prevent damage.
Underoors: e coverage and limitations
for a nozzle protecting an underoor are
identical to those stated above. In addition, the
minimum height of an underoor that may be
protected is 12 in (305 mm). e density of
equipment present in a protected underoor
eects the coverage capability of a nozzle.
In most circumstances, when horizontal line
of sight in the underoor is more than 70%
obstructed, reduce the maximum coverage
distance for each nozzle by 50%. Otherwise,
use the maximum coverage calculations.
3.6 Pipe Determination
Pipe sizes must be determined using the Janus
Design Suite® ow calculation software.
Table 3.6 may be referenced for the purposes
of estimation. e actual diameters may vary
due to distance or software optimization.