SECTION 2 – DESIGN
Page 34 of 39 Fike Clean Agent System w/ FM-200™ UL / ULC Ex4623
Revision Date: January, 2010 Manual P/N: 06-215 (Rev G) FM 3010715
2.11.3.2 TOTAL PRESSURE DROP (TPD) CALCULATION
Refer to the appropriate factor table, (based on the number of nozzles & container size), and calculate the
following:
Length Factor – Multiply the length of each pipe section by the Length Factor (based on the pipe
size for each section)
90
o
Elbow Factor – Multiply the quantity of 90
o
Elbows in each pipe section by the 90
o
Elbow Factor
(based on the pipe size for each section)
45
o
Elbow Factor – Multiply the quantity of 45
o
Elbows in each pipe section by the 45
o
Elbow Factor
(based on the pipe size for each section)
Tee Factor – Multiply the quantity of Tees (this should always be <1>) in each pipe section by the
Tee Factor (based on the pipe size for each section). The Tee Factor MUST be counted in the INLET
section.
Check Valve Factor – Add the equivalent length of the Check Valve (based on the discharge outlet
valve size) for Main & Reserve system configurations
Figure the Total Pressure Drop Factor – The TPD is the SUM of the Length, Elbow, Tee and
Check Valve Factors for each section
NOTE: The TPD is based upon the flow to one (1) nozzle only. Since the Pre-Engineered System requires a
balanced flow arrangement, it is assumed that if one (1) nozzle will discharge in the ten (10) second
discharge requirement, the others will discharge similarly. However, the TPD MUST be based on the
nozzle that is located farthest from the container.
WARNING: The Total Pressure Drop (TPD) MUST be <100> or less for the design/installation to be
acceptable.
2.11.3.2-A SINGLE NOZZLE FACTORS TABLE
TPD FACTORS TABLE (ENGLISH)
Pipe Size
Length Factor
90
o
Elbow
Factor
45
o
Elbow
Factor
1” NPT 1.00 2.80 1.30
1-1/2” NPT 0.85 3.66 1.70
2” NPT 0.80 4.40 2.08
TPD FACTORS TABLE (METRIC)
Pipe Size
Length Factor
90
o
Elbow
Factor
45
o
Elbow
Factor
25 mm 3.28 2.80 1.30
40 mm 2.79 3.66 1.70
50 mm 2.62 4.40 2.08
A
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