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#1
12-06-2006, 01:11 PM
 Unregistered Guest Posts: n/a
kg/hr to MMSCFD

flow - 700000 kg/hr
gas density - 63 kg/m3
MW - 20.4
press - 986 psig
temp - 82.4F

I did the conversion without taking into consideration the effects of temp and pressure and I got 9.42 MMSCFD

Someone else did the conversion taking into consideration temp and pressure and got 677 MMSCFD

I can't figure out how to arrive at the 677 MMSCFD solution. How is this done?

Thank you.
#2
12-06-2006, 04:45 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,416 Rep Power: 12
Re: kg/hr to MMSCFD

700000 kg/hr / 63 kg/m3 = 11111.11 m3/hr

11111.11 m3/hr = 9 417 243.381 651 92 ft3/day

9417243.38165192 ft3/day / 1000000 = 9.417 MMCFD

I got the same as you, not taking pressure and temperature into account. To convert MMCFD to MMSCFD you will need to know what standard temperature and pressure is. Then use the ideal gas law.

(PiVi)/Ti = (PfVf)/Tf

With P = Pressure, V = Volume, T = Temperature, i being initial and f being final.
#3
05-02-2007, 02:00 AM
 Unregistered Guest Posts: n/a
Re: kg/hr to MMSCFD

As per the formula
(PV/T)i = (PV/T)f
THE FINAL VOL = 9.4 MMCFD
THE FINAL TEMP = 82.4 F
FINLAL PRESSURE = 986PSIG

FOR CONVERDION FROM MMCFD TO MMSCFD WHAT SHOULD BE THE BASE TEMP AND PRESSURE AND IN WHAT UNITS?

THE IDELA GAS LAW IS APPLICABLE ONLY FOR LOW PRESSURES UPTO 45 PSIA, BUT IN THE ABOVE CASE THE PRESSURE IS 1000.7 PSIA, SO WHAT SHOULD BE THE FORMULA TO BE USED?
#4
08-11-2009, 05:42 AM
 Unregistered Guest Posts: n/a
Re: kg/hr to MMSCFD

To covert kg/hr to MMscfd:
1. kg/hr / MW => kmol/hr
2. kmol/hr * 22.414 => Nm3/hr (1 kmol of gas occupies 22.414 Nm3 volume)
3. Nm3/hr * (273 + 15)/(273) => Sm3/hr (STP : 15 deg C , NTP 0 deg C)
4. Sm3/hr * (3.282^3 * 24 / 1E6) => MMscfd
#5
08-24-2009, 04:51 AM
 Unregistered Guest Posts: n/a
Re: kg/hr to MMSCFD

Cumulative of sm3/h* 35.31 / 1 000 000 = MMSCFD
#6
10-29-2009, 05:35 AM
 Unregistered Guest Posts: n/a
Re: kg/hr to MMscfd

Hi all,

Please i'm having difficulty converting kg/h to MMscfd.
For instance, i need to convert the following from kg/h to MMscfd: 930 000 and 516 240 respectively.
I will appreciate.
#7
10-29-2009, 07:25 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,222 Rep Power: 18
Re: kg/hr to MMscfd

Quote:
 Originally Posted by Unregistered Hi all, Please i'm having difficulty converting kg/h to MMscfd. For instance, i need to convert the following from kg/h to MMscfd: 930 000 and 516 240 respectively. I will appreciate.
The process is well outlined in post 4.

You need to know what the gas is and its molecular weight. You also need to know what temperature your industry uses as "standard" in "standard cubic feet". It varies by industry. If not 15 °C, adjust that step in the outline.

If you don't know either the molecular weight of your gas or its density at standard conditions, it is impossible to proceed.
#8
02-23-2010, 08:20 PM
 Unregistered Guest Posts: n/a
Re: MMSCFD to M3

MMSCFD to M3.....??????
#9
02-24-2010, 03:33 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,222 Rep Power: 18
Re: MMSCFD to M3

Quote:
 Originally Posted by Unregistered MMSCFD to M3.....??????
MMSCFD means million standard cubic feet per day. The standard means actual volume wasn't measured; it was calculated as though the gas was at some standard temperature and pressure (unfortunately different industries use different standards, so you don't really know what temperature)

The cubic feet can be converted to cubic meters, but because of the time element, it will be cubic meters per day
1 million cubic feet*(0.3048 m/1 ft)³ = 28317 m³
so 1 MMSCFD = 28317 m³/day measured at the "standard" temperature and pressure.
#10
02-24-2011, 05:55 AM
 Unregistered Guest Posts: n/a
Re: kg/hr to MMSCFD

It's a great forum, many thanks, please keep doing the good work.

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