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  #1  
Old 08-20-2008, 08:25 AM
mac daddy
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Thumbs up Please help to convert flowrate kg/minute to cubic meter

kindly help me to solve this conversion problem.

I'm selling CNG compressed natural gas- methane;
the most dispenser standard are using kg/minute - for flowrate unit.
and i want to convert the unit to normal cubic meter for our standard volume.

- what's the formula ?
- what the common for methane gas density

if we are not sure, lets assume that the density of methane is 0.667kg/m3

so i would like to know the volume;
1 kg/minute = ??? NM3

Highly appreciated for your help
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  #2  
Old 08-20-2008, 08:53 AM
JohnS JohnS is offline
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Default Re: Please help to convert flowrate kg/minute to cubic meter

Quote:
Originally Posted by mac daddy
kindly help me to solve this conversion problem.

I'm selling CNG compressed natural gas- methane;
the most dispenser standard are using kg/minute - for flowrate unit.
and i want to convert the unit to normal cubic meter for our standard volume.

- what's the formula ?
- what the common for methane gas density

if we are not sure, lets assume that the density of methane is 0.667kg/m3

so i would like to know the volume;
1 kg/minute = ??? NM3

Highly appreciated for your help
The volume of a gas depends on temperature and pressure. Since you want normal cubic meters, this implies the conditions of measurement are 101.325 kPa and 0 C, You need a density measured at these conditions or at least at known conditions you can convert to these (with ideal gas equation)

The second problem is natural gas is mostly, but not purely, methane. The impurities are enough that the average molecular weight and density are noticably different from pure methane.

At 101.325 kPa and 0 C, this site http://www.engineeringtoolbox.com/ga...ity-d_158.html
gives a density of 0.717 kg/m for pure methane, and 0.7 - 0.9 kg/m as typical range for natural gas. For a rough conversion, you could use midpoint, 0.8, but for a conversion that meets "legal for trade" accuracy, you probably need a measured density and quantitative chemical analysis (if you want heat content) for the gas you are selling.

Using the 0.8 figure, 1 kg/min is also 1.25 m/min; just divide by the (hopefully correct) density value.
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  #3  
Old 08-20-2008, 07:05 PM
mac daddy
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Default Re: Please help to convert flowrate kg/minute to cubic meter

Dear John,

appreciate for your replied
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  #4  
Old 04-30-2009, 09:17 AM
Unregistered
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Default Re: Please help to convert the following

The calorific value is app. 10.000 kcal/kg gas or 8.000 kcal/Nm3.

1.400.000 x 800 / 10.000 kg/day = 112.000 kg/day or 112 ton/day

Would like to know the value in m3.

Thaks very much
juanpablogimenezj@gmail.com
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  #5  
Old 04-30-2009, 09:47 AM
JohnS JohnS is offline
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Default Re: Please help to convert the following

Quote:
Originally Posted by Unregistered
The calorific value is app. 10.000 kcal/kg gas or 8.000 kcal/Nm3.

1.400.000 x 800 / 10.000 kg/day = 112.000 kg/day or 112 ton/day

Would like to know the value in m3.

Thaks very much
juanpablogimenezj@gmail.com
Given that you have both heat content values, you can determine the density: 8000 kcal/Nm x 1 kg/10000 kcal = 0.8 kg/Nm

112000 kg/day x 1 Nm/0.8 kg = 140 000 Nm/day.
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  #6  
Old 09-07-2009, 11:28 PM
alaa alamin
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Default Re: Please help to convert flowrate kg/minute to cubic meter

if i have a garages room ( 20m*12m*2.25m),i need ur help to calculate the air flow required in meter cubedper houre
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  #7  
Old 09-08-2009, 02:32 AM
JohnS JohnS is offline
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Default Re: Please help to convert flowrate kg/minute to cubic meter

Quote:
Originally Posted by alaa alamin View Post
if i have a garages room ( 20m*12m*2.25m),i need ur help to calculate the air flow required in meter cubedper houre
The volume of your garage is just the product of those dimensions, 540 m. However, different building codes require different rates of air exchange per hour. Two exchanges per hour would require 1080 m/h.
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  #8  
Old 06-20-2012, 04:46 PM
Andy Cameron Andy Cameron is offline
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Default Re: Please help to convert flowrate kg/minute to cubic meter

Dear mac daddy and JohnS,
THere used to be a conversion table on the Emerson Web site for the micromotion meter.
There is a lot of pressure on CNG equipment makers to rate their Cv factors so one can calculate the pressure needed to dispense gas at the 150kg/min rate the meteres are designed for.
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  #9  
Old 06-20-2012, 04:49 PM
Andy Cameron Andy Cameron is offline
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Default Re: Please help to convert flowrate kg/minute to cubic meter

THe Emerson Micromotion CNG50 data sheet gives 7550Nm3/hr equal to 100kg/min.
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