air flows, compressors & diffusers
air flows, compressors & diffusers
(OP)
Guys
We have a blower producing 4000 m3/hr of air at 0.3-4 bar which feeds 4 lanes of under water diffusers. Manifold pipe is 24” dia with 8” branches to individual lanes.
When the blower is down the plan is to isolate the 8 inch pipes from the manifold and feed air (1m3/min @ 7 bar) from a diesel road drill compressor into the 8 inch pipe via a ¾” hose and claw coupling.
Any thoughts, questions or warnings from those who know better than me would be welcome
We have a blower producing 4000 m3/hr of air at 0.3-4 bar which feeds 4 lanes of under water diffusers. Manifold pipe is 24” dia with 8” branches to individual lanes.
When the blower is down the plan is to isolate the 8 inch pipes from the manifold and feed air (1m3/min @ 7 bar) from a diesel road drill compressor into the 8 inch pipe via a ¾” hose and claw coupling.
Any thoughts, questions or warnings from those who know better than me would be welcome





RE: air flows, compressors & diffusers
4000m3/hr is 66m3/min or 86m3/min free air(at 0.3 bar) and 330m3/min free air (at 4 bar) which is quite a big unit.
I presume that the road compressor is a 250cfm unit (They use volume of free air for capacity), so that you will get a lot less air at 4 bar than the main unit. It is likely that not all the diffusers will work, it depends on the water head.
You will lose a lot of pressure using a 3/4" hose and for better efficiency I would use a 2" hose, and as short as possible.
Is there an environmental issue will the oil in the road compressor?
RE: air flows, compressors & diffusers
Forgive me but I don’t understand the terminology you are using.
The compressor people said 1m3/min @ 7 bar which I assumed would expand to 7m3/min @ 1 bar or 17.5 m3 @ 0.4 bar.
Is this correct or have I got hold of the wrong end of the stick?
RE: air flows, compressors & diffusers
If the latter then it is better.
The 7m3/min is the free air volume. If you are pumping at 1 bar atmospheric plus 0.4bar (4m water depth) i.e. 1.4 bar, then you will get 5m3/min.
Best regards
StephenA
RE: air flows, compressors & diffusers
does this mean i will get 17.5 m3 @ 0.4 bar if i expend 1 m3 @ 7 bar?
RE: air flows, compressors & diffusers
Best regards
StephenA