TABLE 4-1. PIPING LIMITATIONS
Length
Pipe Identification
Pipe Size
Maximum
Between detector cabi-
3/4 in. I.D. (Nom)
1000 equivalent feet
net and furthest accumulator.
Between detector cabinet and
3.5 in. I.D. (Nom)
100 equivalent feet
suction blower housing
Between blower housing and
3.5 in. I.D. (Nom)
15 equivalent feet
atmosphere
Between blower housing and
1 in. I.D. (Nom)
250 equivalent feet
olfactory valve
NOTE 1: Equivalent lengths are based on those given for O02 piping in NFPA Pamphlet 12.
NOTE 2: Equivalent length for detection lines in addition to the 3-way valve.
