SECTION III
UL EX-4510 7-15-02 Page 3-3
REV. 1
General Information
SYSTEM LIMITATIONS (Continued)
Design Limitations (Continued)
• Length from pressure reducer to first tee must be a mini-
mum of 10 pipe diameters.
• Discharge time for 90% of the agent shall be more than
30 seconds after actuation of the system but not to
exceed 138 seconds.
• 1/4 in. and 3/8 in. pipe is allowed in Schedule 40 only.
Schedule 80 or 160 is not allowed in these pipe sizes.
• The maximum allowed split % of INERGEN agent
through a tee is 95%:5%.
• On a side/thru tee, the side outlet must always be the
smallest of the two splits.
• Other than what is stated previously, there are no orienta-
tion or critical length requirements necessary for tee
arrangements.
Flow Calculation Limitations
• Minimum Nozzle Pressure 375 psi (2586 kPa)
Pressure:
• Maximum Pipe Volume vs. 56%
Cylinder Volume:
•For unbalanced systems, UL/ULC ratio of nozzle orifice
diameter to pipe diameter shall be a minimum of 11.5%
to a maximum of 70%.
•For unbalanced systems, UL/ULC ratio of pressure reduc-
er orifice to inlet pipe diameter shall be a minimum of
13% to a maximum of 55%.
• In an unbalanced piping system, the time lag in reaching
peak pressure at the various nozzles in the system may
vary. If the variation is beyond certain programmed limits,
an error message is generated indicating that the time to
reach pressure at one or more nozzles is too long. This
condition may result if the length of pipe leading to a noz-
zle is extremely long compared to the length of pipe lead-
ing to one or more other nozzles in the system.
•For unbalanced systems, the INERGEN Designer 5.0.1
Computer Design Program is the only calculation method
to be used with Ansul Engineered INERGEN systems.
• The INERGEN Designer 5.0.1 Computer Design Program
is designed for a +70 °F (+21 °C) cylinder operating/
storage temperature. Therefore, the cylinder operating/
storage temperature must be in the range of +60 °F to
+80 °F (+15.5 °C to 26.7 °C) for a single unbalanced sys-
tem protecting two or more separate hazards. If the cylin-
der operating/storage temperature is outside this range,
an insufficient or excessive quantity of agent may be dis-
charged from one or more discharge nozzles.
If cylinders cannot be stored within this range, then each
hazard must be protected with its own individual system.
• Maximum and minimum flow rates per table. (NOTE:
Table entries are rounded to the nearest whole numbers.
Computer calculation uses same data in equation form –
therefore there may be slight (1 scfm or less) differences
in the minimum and maximum values on the computer
printout.) This table is for general use only. It can be used
for evaluation of a completed flow calculation.
• The calculation method has been designed for specific
types of fittings, pipe, and pipe inside diameter. When
these limitations are not maintained, there is a risk that
the system will not supply the required quantity of extin-
guishing agent.
5%
002202
95%
IN
50%:5%
50%:5%
002201
IN
IN
BULL TEE
SIDE THRU TEE
50%:95% 50%:95%
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