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kgomez
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Join Date: Jul 2012
Posts: 3

Leakage Rate Conversion

08/15/2012 2:21 AM

Hi ,

can anyone assist me with the conversion of kg/hr to scf/yr. We normally carry out Helium leak detection to scf/yr but client has given me an acceptable leak rate of 3.4kg/hr. I am wondering what this would be in scf/yr (standard cubic feet/year)
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: leakage rate conversion

08/15/2012 3:20 AM

Hint: involve the density of He at the ambient conditions prevailing at the leakage point.

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jesw55
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Join Date: Aug 2010
Location: Wales, UK
Posts: 391
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#2

Re: leakage rate conversion

08/15/2012 3:25 AM

Hi kgomez,

I hope someone else can verify (or not) these figures.

3.4 kg/hr. = 1054.1687 scf/yr.

I have a conversion program that shows oz/hr. (UK Ounces / Hour) which I converted to kg/hr. (1 kg. = 35.27392 oz.)

It also shows Cubic Feet / Hour x 24 x 365 to get Cubic feet / Year.

Best regards,

John

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bigg
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Join Date: Jun 2010
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#3

Re: Leakage Rate Conversion

08/15/2012 9:39 AM

Are you sure that's 3.4 kilograms/hr? That sounds like a lot, especially for a leak test. At any rate, my book states 0.165 kg/m3 (0.0103 lb/ft3, sg = 0.138) at 21.1 °C (70 °F) and 1 atm.

3.4 kg/hr / 0.165 kg/m3 * 24 hr/day * 365 day/yr / 0.02832 m3/ft3 = 6.37 x 106 cu ft/year (check my math)
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Whitephone
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Join Date: Jan 2010
Location: Mineral wells Tx
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#4

Re: Leakage Rate Conversion

08/16/2012 10:27 AM

3.4Kg/H? .Sorry there is something wrong.
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kgomez
Participant

Join Date: Jul 2012
Posts: 3
#5

Re: Leakage Rate Conversion

11/06/2012 11:10 PM

Hi,

It seems that client want us to find leaks with Helium measured in Scf/yr and than want us to convert that to simillar leakage for LNG at kg/hr. Anybody know how to convert this.
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