NIRE-170-1-6
21
4. Piping
The procedures of the pipe arrangement for the air diffusers and the filtrate water manifold
are described in this section. The connections of the air diffuser and the filtrate water
manifold are shown in the module drawings attached to this manual.
(1) Pipe Arrangement for the air diffusers
The pipe from the air supply device (blower) is connected to the two flanges (A)
located on the air diffuser (see Fig.IV-9)
. When using polypropylene diffuser, heat tolerant
plastic pipe and/or use of flexible pipe/joint is recommended for the pipe for easy flange
connection without putting stress to the air diffuser. It is recommended that the air supply
flange (B) be installed above the tank liquid level to facilitate removal should the module
need to be lifted from the tank.
To facilitate cleaning of the air diffuser install branch pipes and valves as illustrated in Fig.
IV-9, it is recommended that these valves be located less than 500 mm above the liquid
surface. It is also highly recommended that these valves be automatically actuated valves
with associated PLC control circuits for automatically controlled air diffuser maintenance
cleaning. Refer to VIII-2 for the procedure recommended for cleaning the air diffusers.
Fig.IV-9 Example of Piping to Air diffuser
B
A
B
Discharge valve
Branch pipe
Air diffuser
500mm or less
Liquid level
Header pipe
A
B
