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 Convert and Calculate Post any conversion related questions and discussions here. If you're having trouble converting something, this is where you should post.* Guest Posting is allowed.

#1
08-20-2008, 08:25 AM

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

#2
08-20-2008, 08:53 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,445 Rep Power: 19

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/m³ for pure methane, and 0.7 - 0.9 kg/m³ 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 m³/min; just divide by the (hopefully correct) density value.
#3
08-20-2008, 07:05 PM

Dear John,

#4
04-30-2009, 09:17 AM
 Unregistered Guest Posts: n/a

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
#5
04-30-2009, 09:47 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,445 Rep Power: 19

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/Nm³ x 1 kg/10000 kcal = 0.8 kg/Nm³

112000 kg/day x 1 Nm³/0.8 kg = 140 000 Nm³/day.
#6
09-07-2009, 11:28 PM
 alaa alamin Guest Posts: n/a

if i have a garages room ( 20m*12m*2.25m),i need ur help to calculate the air flow required in meter cubedper houre
#7
09-08-2009, 02:32 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,445 Rep Power: 19

Quote:
 Originally Posted by alaa alamin 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 m³. However, different building codes require different rates of air exchange per hour. Two exchanges per hour would require 1080 m³/h.
#8
06-20-2012, 04:46 PM
 Andy Cameron Oasis Andy Join Date: Jun 2012 Posts: 2 Rep Power: 0

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.
#9
06-20-2012, 04:49 PM
 Andy Cameron Oasis Andy Join Date: Jun 2012 Posts: 2 Rep Power: 0

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

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