How to convert m3/hr into Nm3/hr?

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Anonymous Poster	How to convert m3/hr into Nm3/hr? 01/17/2010 4:32 AM
	please any body guide to convert 2916 m3/hr gaseous oxygen flow rate into Nm3/hr at temperature of 35deg C & pressure of 32 kg/cm2 in a 12 inch diameter of pipe line .
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TVP45 Guru Join Date: Jul 2007 Posts: 4448 Good Answers: 143	#1 Re: How to convert m3/hr into Nm3/hr? 01/17/2010 8:14 AM
	Multiply m³/hr by (T_STP· P_ACTUAL/T_ACTUAL· P_STP) to get Nm³/hr. T is absolute temperature and P is absolute pressure. STP is standard temperature and pressure conditions. __________________ "Well, I've wrestled with reality for 35 years, Doctor, and I'm happy to state I finally won out over it." Elwood P. Dowd
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Anonymous Poster	#2 In reply to #1 Re: How to convert m3/hr into Nm3/hr? 01/17/2010 8:28 AM
	Dear , Many thanks for the reply , one point is clear that is T stp = 273 deg K ; but what will be P stp ?
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#3 In reply to #2 Re: How to convert m3/hr into Nm3/hr? 01/17/2010 8:53 AM
	I don't know where you are going to school, but if you don't know what the values are for standard temp/pressure your money is being wasted. Wiki.
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Anonymous Poster	#5 In reply to #3 Re: How to convert m3/hr into Nm3/hr? 01/17/2010 10:44 PM
	"I don't know where you are going to school, but if you don't know what the values are for standard temp/pressure your money is being wasted." Why the sarcasm and bitterness? Live and let live Mr. Lynch, never too late.
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#7
In reply to #3

01/18/2010 2:24 AM

Beware, not all STP's are equal - see this extract from Wiki.

Table 1: Standard reference conditions in current use

Temperature	Absolute pressure	Relative humidity	Publishing or establishing entity
°C	kPa	% RH	Publishing or establishing entity
0	100.000	IUPAC (present definition)^[1]
0	101.325	IUPAC (former definition)^[1], NIST^[6], ISO 10780^[7]
15	101.325	0 ^[8]^[9]	ICAO's ISA,^[8] ISO 13443,^[9] EEA,^[10] EGIA^[11]
20	101.325	EPA,^[12] NIST^[13]
25	101.325	EPA ^[14]
25	100.000	SATP ^[15]
20	100.000	0	CAGI^[16]
15	100.000	SPE^[17]
20	101.3	50	ISO 5011 ^[18]
°F	psi	% RH
60	14.696	SPE, ^[17] U.S. OSHA,^[19] SCAQMD^[20]
60	14.73	EGIA, ^[11] OPEC,^[21] U.S. EIA^[22]
59	14.503	78	U.S. Army Standard Metro ^[23]^[24]
59	14.696	60	ISO 2314, ISO 3977-2 ^[25]
°F	in Hg	% RH
70	29.92	0	AMCA,^[26]^[27] air density = 0.075 lbm/ft³. This AMCA standard applies only to air.

Notes:

__________________
I have no special talent. I am only passionately curious. Albert E

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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#8 In reply to #7 Re: How to convert m3/hr into Nm3/hr? 01/18/2010 9:21 AM
	OK, there may be more than one accepted value. But, I would think some value would have been introduced to the student during discussion of STP. Forgive me if I'm too critical/snarky.
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Anonymous Poster	#12 In reply to #8 Re: How to convert m3/hr into Nm3/hr? 07/15/2010 9:37 AM
	Once more you have been shown uo for what you are - an ignorant uneducated grumpy fool. Where did you go to school?
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TVP45 Guru Join Date: Jul 2007 Posts: 4448 Good Answers: 143	#4 In reply to #2 Re: How to convert m3/hr into Nm3/hr? 01/17/2010 9:49 AM
	You may use any units you like just so long as the lowest possible temperature is 0 and the pressure of a vacuum is 0. __________________ "Well, I've wrestled with reality for 35 years, Doctor, and I'm happy to state I finally won out over it." Elwood P. Dowd
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sv13 Commentator Join Date: Jun 2009 Location: Between India & Australia Posts: 71 Good Answers: 3	#6 In reply to #2 Re: How to convert m3/hr into Nm3/hr? 01/18/2010 1:31 AM
	P stp 1.01325 bar, convert to kg/cm2 and use with 32 kg/cm2 in your equation. Ensure the pressures are in absolute. __________________ Continuous Learning
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sabriahmad Commentator Join Date: Nov 2009 Posts: 78 Good Answers: 9	#9 Re: How to convert m3/hr into Nm3/hr? 01/18/2010 8:04 PM
	I believe the pressure 32 kg/cm2 is a gauge pressure. If this is so then convert this into atm absolute. My conversion shows that this is equal to 31.97 atm absolute (please reconfirm). Then apply the Gas Law to get the volume at STP or sometime it is called NTP that refers to 0C and 1 atm. Let V is the volume at STP then V = [P1/P] x [T/T1] x V1 Where P1 = 31.97 atm P = 1 atm T1 = 273.15 + 35 = 308.15 T = 273.15 V1 = 2916 m3/h therefore V = [31.97/1] x [273.15/308.15] x 2916 = 82,635.98 Nm3/h
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Anonymous Poster	#10 In reply to #9 Re: How to convert m3/hr into Nm3/hr? 01/19/2010 2:08 AM
	Excellent , I have also the same results , requirement was only the confirmation and some clarifications . Thanks for your support dear Sabri .
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sabriahmad Commentator Join Date: Nov 2009 Posts: 78 Good Answers: 9	#11 In reply to #10 Re: How to convert m3/hr into Nm3/hr? 01/19/2010 4:07 AM
	You are most welcome, dear friend
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