Copper tubing for fuel oil

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  #1  
Old 03-14-15, 10:46 AM
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Copper tubing for fuel oil

I want to run some new copper tubing from my tank outside to the floor heater under my house. Currently I have 3/8" tubing in place that has been there since probably late 80's to early 90's. I bought a 50 ft coil of 3/8" O.D. from Lowes. I asked the sales kid what type it was and he told me that it was Type L. From what I've read Type L is acceptable for fuel oil. My roommate is questioning the label on the box because it says "Refrigeration 3/8" x 50 ft".

So does this sound like I got the proper tubing even though it says "Refrigeration" on the box?

Shades
 
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Old 03-14-15, 10:59 AM
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Yes.... type L copper is approved for use with fuel oil transfer.
 
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Old 03-14-15, 11:20 AM
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Thanks PJMax!

One last question, my roommate insists that it should be 3/8" I.D. whereas I have 3/8" O.D. that the walls of the tubing is thinner and the I.D walls are thicker and better for fuel oil. Is there any reason I shouldn't use what I have or return it and exchange it for I.D. 3/8"?

Shades
 
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Old 03-14-15, 11:26 AM
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See if this chart helps some..... the OD remains constant for 3/8" copper.
Type L is commonly used for oil tanks.
 

Last edited by PJmax; 03-14-15 at 12:23 PM. Reason: removed incorrect chart
  #5  
Old 03-14-15, 11:31 AM
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So the chart is saying that the wall thickness on a 3/8" O.D. is 0.500 which is actually thicker than the I.D. of 0.430?

Hopefully last question. I appreciate your expertise.

Shades
 
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Old 03-14-15, 11:58 AM
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No... it's saying that with 3/8" copper pipe.... the OD is always .500

The ID and the wall thickness depends on type of pipe.
 
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Old 03-14-15, 12:04 PM
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3/8 inch copper tubing as used with refrigeration and fuel oil systems is 3/8 inch outside diameter. Tubing is always measured by its outside diameter. 1/2 inch nominal copper water piping is 5/8 inch outside diameter.
 
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Old 03-14-15, 12:24 PM
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I removed my incorrect chart. It was incorrectly in the place of standard copper tubing not roll tubing.

Thanks for the correction... Furd
 
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Old 03-14-15, 12:36 PM
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Thank you so much for your time and expertise Furd and PJMax!


Shades
 
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Old 03-14-15, 12:39 PM
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So use the 3/8 soft roll copper and all will be good. Make sure the pipe is clean at the compression fittings.
 
  #11  
Old 03-14-15, 02:14 PM
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Flared fittings, PJ. Never use compression fittings with fuel oil. And use only Permatex number two goop on any pipe threads.
 
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