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Pressure (dePa)

10/05/2007 2:27 PM

I received some information today regarding a blower and the specifications list that the blower moves 75 cbm of air and following this it listed 500 dePa.

The 75 cbm is 75 cu.ft/min this I verified. But does the dePa stand for dPa?

Regards,

HXE

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#1

Re: Pressure (dePa)

10/06/2007 12:34 AM

Well, according to Wikipedia, DEPA = Dimosia Epichirisi Paroxis = Public Gas Supply Corporation of Greece. Go figure!

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#2

Re: Pressure (dePa)

10/06/2007 10:33 AM

'de' could be 'deci' or 'deca'. DeciPascal seems ridiculously low, So I'd vote for 500 decaPascal or 50 HectoPascal which should be 50 millibars - reaonable overpressure for a large benign blower.

Or maybe I forgot all my not up to date unit conversions.

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#3

Re: Pressure (dePa)

10/06/2007 11:14 AM

In SI Units:-

d = deci (0,1)

da = deca (10)

Looks like someone got their wires crossed with dePa. As suggested it should probably been daPa and just to add this is not a preferred unit.

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#4

Re: Pressure (dePa)

10/08/2007 3:56 AM

As it seems the blowers data are given in metric units but I agree with other participiants, the maker is not really familar with these units.

  1. Flow rate
    cbm probably stands for cubicmeter - but in what time? A minute would be a common approach, but can we assured it is not within a second?
    If a volume of 75 m3 is true it would be 3219 cu.ft., not 75 cu.ft.
    Thus you probably will have a flow of 3219 cu.ft/min.
  2. Pressure difference
    Again I agree to already mentioned interpretations of the 500 dePa. "de" isn't a valid metric sign: we can have d for deci (1/10) or da for deka (x10). In fact 50 Pa pressure increase makes no practical sense for a blower I would think "da" was meant (nevertheless, for a technician it is nonsens using other multiplicators than milli, kilo, Mega, etc. - the deka, deci and hecto are just for confusion): 500 daPa is about 500 mmWaterScale (therefore the da is used with Pa from oldfashioned technicians). 500 daPa = 5000 Pa = 50 mbar.

For your application you better asking the maker of the blower what he has meant with these faulty data - possibly there is more crosswired than the metric units ...

Albert

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#5

Re: Pressure (dePa)

10/08/2007 9:56 AM

Did the blower have a motor? What's the HP rating? Power is related to pressure and flow.

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Active Contributor

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#6

Re: Pressure (dePa)

10/08/2007 10:25 AM

In response to Albert C.

75 cbm being equates to 2649 cfm. I forgot to do the conversion!

In response to Bill, the motor is a 20hp motor.

I've contacted the vendor for blower curves and I haven't gotten a response yet.

Regards,

HXE

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#7
In reply to #6

Re: Pressure (dePa)

10/08/2007 11:08 AM

Near as I can figure, 20 HP motor moving 2650 cfm @ 1725 RPM will yield a pressure of nearly 28" H2O. Rough calculation @ STP, 11,925 lb/hr.

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Users who posted comments:

Albert Caspers (GER) (1); Bill (2); dovy (1); hnorwood@urrc.net (1); MOBI (1); vermin (1)

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