I have a document that expresses the gas flow rate in kNm3/day. I
would like to have an explaination of what the unit KNm3 is. What is
the conversion factor to change the rate to cubic feet/day (Flow
calcualtion AGA-3compliant).

Nm3 is a common unit used in industry to refer to gas emissions or
exchange.  It stands for Normal cubic meter.  Normal, in this case,
refers to the gas at 0 degrees Celsius.

To convert Nm3 to a cubic foot of gas (under standard conditions),
multiply by 38.04.

Therefore, 1,000 Nm3/day = 1 kNm3/day = 38,040 cf/day.

The following sites offer some additional background on these units of
measurement:

http://www.engva.org/view.phtml?page=127.phtml

has a conversion factors chart.

http://www.puregastechnologies.com/glossary.htm#n

and

http://216.239.37.100/search?q=cache:t7SNJl4ybmgJ:www.omanlng.com/htm/lng_facts/glossary_appc.asp+site:www.omanlng.com+Nm3&hl=xx-elmer&ie=UTF-8

provide some definitions of Nm3.  


Hope this is what you need.  If anything requires explanation or
additional information, just let me know through a Request for
Clarification, and I'll be glad to help you further.


Search strategy:  Google searches on:  

kNm3/day

kNm3/hr

Nm3/day

Nm3/hr

Thanks..Provided the right level of information in answer to my questions.