Kidde Fire Systems FM-200 ECS Series User Manual

4-6
90-FM200M-000 September 2004
FM-200
®
ECS Series Engineered Fire Suppression Systems
4-2.3.1 FIRST BRANCH FLOW SPLIT
To assure accuracy of the flow calculations, there are
various agent flow limits. The maximum % agent in pipe
for all systems is 80%. There is a limit on the allowable
percent of agent prior to the first tee. When these condi-
tions are not met, the computer displays a warning. It is
then up to the system designer to correct the piping vol-
ume to the first branch split. For example, when reading
Figure 4-1, in order to achieve 60% agent in pipe, a mini-
mum of 8.3% agent is required prior to the first tee. When
this condition is not met, the computer displays a warn-
ing. It is then up to the system designer to correct the
piping volume to the first branch split to meet this design
requirement (see Figure 4-2).
Limits: % of agent in pipe and % of agent
before first tee. (As computed by "FLOW",
do not use for manual computation.)
7.9%
8.3%
33.6%
0%
5%
10%
15%
20%
25%
30%
35%
0% 10% 20% 30% 40% 50% 60% 70% 80%
% OF AGENT IN PIPE
% OF AGENT BEFORE
FIRST TEE
Figure 4-1. Percent Agent Before First Tee as a
Function of Percent Agent in Pipe
4-2.3.2 TEE FLOW SPLITS
Flow splits at tee junctions are sensitive to gravity. Even
though turbulent flow exists, there is a tendency for the va-
por phase to migrate to the upper portion of the pipe leav-
ing a more dense medium at the bottom of the pipe. For
this reason, the limitations in Figure 4-2 must be observed.
4-2.3.2.1 Requirements for Tee Flow Splits
1. Bull head tees must have both outlets in the horizontal
plane. The inlet to a bull head tee may approach in a
horizontal, vertically up or vertically down direction.
2. Side tees must have the inlet and both outlets all in the
horizontal plane.
3. Elbows either before a tee, or after, which split to a
separate hazard must be located a minimum distance
of 15 pipe diameters (nominal) before the tee.
4. Tee splits going to separate hazards from a common
supply line must be spaced a minimum of 15 pipe di-
ameters (nominal) apart.
5. Pipe reducers must be the concentric reducer type.
6. Minimum flow out of a side tee branch is 10% of total
flow at the tee.
7. For flow splits less than 30%, the split shall be done
through a side tee with the smaller flow going through
the side tee member. The minimum flow through the
side tee member is 10%. The maximum flow through
the tee is 90%.
8. For flow splits equal to or greater than 30%, the split
shall be done through a bull head tee. The maximum
flow split through a bull head tee is 70%.
Table 4-5. 15 Pipe Diameters
Pipe Size
15 Pipe Diameters
feet
feet and
inches
meters
1/2"
0.63 7½ 0.192
3/4"
0.94 11¼ 0.287
1"
1.25 1'3" 0.381
1¼"
1.56 1'6¾" 0.475
1½"
1.88 1'10½" 0.573
2"
2.50 2'6" 0.762
2½"
3.13 3'1½" 0.954
3"
3.75 3'9" 1.143
4"
5.00 5' 1.524

Kidde Fire Systems FM-200 ECS Series Specifications

General

Brand	Kidde Fire Systems
Model	FM-200 ECS Series
Category	Firefighting Equipment
Language	English