SECTION 2 – DESIGN
Page 22 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
2.8.5 MINIMUM PIPING DISTANCE (ENGINEERED SYSTEMS)
A minimum of ten (10) pipe diameters must be maintained between fittings to stabilize the flow and maintain the
accuracy of the splits occurring at the tees. The (10) pipe diameter rule applies to the following configurations.
2.8.5.1 DISTANCE FROM A TEE TO AN ELBOW OR TEE
When a Tee is located before an Elbow or another Tee, the minimum distance between the fittings must be ten
(10) pipe diameters.
2.8.5.2 DISTANCE FROM AN ELBOW TO A TEE
When an Elbow is located before a Tee, the minimum distance between the Elbow and the Tee must be ten (10)
pipe diameters.
NOTE: The ten (10) pipe diameter rule does not apply:
- between an Elbow and another Elbow.
- when using back-to-back 180º nozzles as long as:
1) Agent supplied and flow rate from both nozzles are the same.
2) Pipe size from tee to both nozzles is the same.
3) Pipe lengths from tee to each nozzle are within 10% of each other.
L
L
L
L
10 PIPE DIAMETERS VS. PIPE SIZE
Pipe Size
Minimum
Length
Pipe Size
Minimum
Length
3/8” NPT 4” 10 mm 102 mm
1/2” NPT 5” 15 mm 127 mm
3/4” NPT 8” 20 mm 204 mm
1” NPT 10” 25 mm 254 mm
1-1/4” NPT 12” 32 mm 305 mm
1-1/2” NPT 15” 40 mm 381 mm
2” NPT 20” 50 mm 508 mm
2-1/2” NPT 25” 65 mm 635 mm
3” NPT 30” 80 mm 762 mm
4” NPT 40” 100 mm 1016 mm
5” NPT 50” 125 mm 1270 mm
6” NPT 60” 150 mm 1524 mm
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