Toshiba LF150 Instruction Manual page 14

4.1.2 Precautions on Piping
(1a) Ideal Upstream Straight Pipe Length Installation Requirements
If various joints are used upstream of the detector outlet, the straight pipe
length as shown in Table 4.2 is required.
Table 4.1 Ideal straight pipe length on the upstream side
(1) 90°bent
(2) Tee
(3) Diffuser
(4) Fully opened sluice
L: Required straight pipe length—straight pipe length plus half length of the detector.
D: Nominal bore size (diameter)
NOTES
The length of a reducer, if connected, can be counted as a part of the straight
pipe length.
No straight pipe length is needed on the downstream side. If a butterfly valve is installed
downstream of the detector, do not let the valve plate protrude into the pipe of the
detector.
L=5D
L
L
L
L
13
— —
L=10D
(5) Other valves (not fully opened)
L
６Ｆ８Ａ０９１６