Posted by admin | Posted in Parts And Stuff | Posted on 14-09-2009
Tags: propane regulator automatic changeover
Regulator Automatic Changeover
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How to use more than 2 propane tanks at a time?
I'm in the process of planning / setting up an off grid cabin, and I plan on using propane for heat as well as to power my refrigerator, stove, and possibly other things. I would like to use a larger tank (100 gallons...not pounds... for more) so I don't have to worry about running out of propane in the dead of winter. However, finding a 100 gallon tank locally isn't panning out. So, my question is, can I connect sat....4 100 POUND tanks together (which should give me right around 100 gallons) with some kind of automatic changeover liquid propane gas regulator setup?
I can only find 2 way automatic regulators. Is it safe or feasible to connect 2 of the tanks using an automatic regulator, the other 2 tanks using a different auto regulator and then connect the 2 regulators together using a different regulator to tie the whole thing together? Or does this whole thing seem a bit hokie? Thanks
Changeover regulators don't work well in cold temperatures. This is in part because of the properties of propane and in part by the design of these type of regulators. Without going into exactly how they work (that is a book in itself!) suffice it to say that they work well when loads are relatively light and temperatures are moderate. In cold temperatures or heavy loads the regulator will draw from both sides anyway, so in this application it's not the best idea.
You can connect cylinders together using what are commonly called "pigtails" and t-blocks. see 1350R on page A32 of this document as well as 912PS20 on page A31 http://www.regoproducts.com/PDFs/L-500_Section-A.pdf
In most places fuel handling code limits this to 3 cylinders connected at a time. So that would give you about 60 gallons with three 100LB cylinders. You would put a standard regulator that is correctly sized for the installation into one side of a t-block on the first cylinder and use another t-block and 2 pigtails to manifold the other two cylinders in. You will draw on all three cylinders at once. Or you could manually turn one off as a reserve. Keep in mind though, that you must always have three cylinders connected up! You cannot disconnect one cylinder and leave the pigtail hanging! All three cylinders have to be turned off to switch any empties out.
As always make sure all connections are leak free using a 50/50 solution of dish soap and water and you should have the installation inspected by a qualified technician before turning the gas on.
Hope this helps! Be safe!
