28 posts
TimePosted 18/11/2008 05:27:17
Saprina says



Why does the gas flow in the mills and kiln measure by Nm^3 not only m^3 ?

How can we change the unit of gas flow from Nm^3 to m^3 or the opposite?



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32 posts
TimePosted 18/11/2008 12:27:02
guddu says

Re: Nm^3


Shake hand

Well when we talk about gas law STP comes into play stp is nothin but the(Standardrd temp pressure). Basically the air is being specified on the Europe standard benchmark. Dont get stymie about this Nm3 is Nominal m3 with the nominal cond T=27DEFG, P-15PSI,

If your value being changed from this by external means, that spells indicates the value is not in nomonal condition rather it is actual output of particular M/C.

To get a sense the relation b/w both

1M3/HR= 1.15NM3/HR

Hope iam able to make you conceivable, just thread your query furthur if any

All for now



29 posts
TimePosted 18/11/2008 17:56:45
vinayak says

Re: Nm^3


In general, for some the questions asked in the forum, we can get good answers in the internet itself

For ex STP and NTP, the def in net is as below

STP - Standard Temperature and Pressure

STP is commonly used to define standard conditions for temperature and pressure which is important for the measurements and documentation of chemical and physical processes:

  • STP - Standard Temperature and Pressure - is defined by IUPAC (International Union of Pure and Applied Chemistry) as air at 0oC (273.15 K, 32 oF) and 1 atm (101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 29.92 in Hg, 760 torr, 33.95 Ft.H2O, 407.2 In.W.G, 2116.8 Lbs./Sq.Ft.)
  • STP - commonly used in the Imperial and USA system of units - as air at 60 oF (520 oR) and 14.696 psia (15.6oC, 1 atm)

NTP - Normal Temperature and Pressure

NTP is commonly used  as a standard condition  for testing and documentation of fan capacities


Coming back to the question asked, NM3 is used to have the common norms. If we use m3 /hr , then we have to know at what temperture it is? . To combine both, we are converting the actual volume in to the NTP usinf\g the formula

(P1 X V1)/ T1   = (P2  X V2 ) / T2

 where P1 - Norma prssure and P2 - Actual pressure





22 posts
TimePosted 19/11/2008 03:04:35
kesavaraj says

Re: Nm^3


i could guess that is normal cubic metre.And not nominal .

Am i correct?