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[Subject_Name_Here]

Hi all,

I have a burner for drying product that use to run off of propane but now runs on CNG (compressed natural gas). The flow meter on the feed line gives a reading of 2923 SCFH. From this reading I used a conversion of 1035 BTU/cf, or 1.035 therms/ccf (given by supplier) to get a rate of 3,025,305 BTU/h.

The problem is when I look back at past propane usage, the BTU's don't match.

Typically, we would use 642 gal/h propane, which ralates to 58,743,000 BTU/h (using 91,500 BTU/gal propane), but this means we're only using 5% of the BTU's we use to use!

I suspect the problem may lie in the SCFM units. Any ideas are much appreciated.

Thanks,
Mike

[S.AHMAD]

1. You need to do energy balance of the system in order to determine which meter is correct.
2. Either 1 is correct or both icorrect.