Added a new 500 gallon LP tank...

   / Added a new 500 gallon LP tank... #1  

nikdfish

Platinum Member
Joined
Oct 14, 2010
Messages
989
Location
Person Co. NC
Tractor
John Deere 3038E & 1025R FILB
We put in a 22kw whole house generator last year, plumbed to our existing self-owned 500 gallon propane tank. Since that time I had been ruminating over run times vs. fill level & finally decided we really needed to expand our fuel reserve.

The issue was that we normally wait until about 50% full to call for a refill, i.e. 100+ gallons on a fill to avoid a potential additional fee. At the 1/2 full point, I was estimating about 4 days - maybe less if we are burning a lot of gas in the furnace (5 ton heat pump is primary, LP is backup). Our most likely outages occur during severe ice storms - which also make LP refills potentially harder to come by due to road conditions.

Southern States was happy to order us a new 500 gallon tank and handle the install to parallel the existing one (other suppliers were not interested - they wanted to supply a "free" tank). Cost for the tank itself was about $1590, delivery & install about $300 (may be less, haven't seen final bill [ETA final delivery+install was ~ $116 as I had already prepped the pads]). They quoted $1.699 /gallon for the initial fill, which is a decent price around here at the moment for a residential LP delivery, $0.10/gallon cheaper than our other local supplier.

It took a week or so for the tank to come in. I prepped pads & gravel for the new tank while waiting, when the installers came out they tweaked them a bit & set the tank, filled it, then left for another job. I cut a slot on the old tank cap (mirroring the one on the other side) to accommodate a line coming from the new tank.

new-lp-tank-02.jpg


After a couple of days, the mechanic came by & set up a "T" connection for both tanks to supply the existing regulator.

joined tanks-02.jpg


joined tanks-03.jpg


The 1/2" line runs under ground for a space between the tanks. This was to reduce the potential for damage from things like falling limbs or running deer.

joined tanks-01.jpg



With the new tank, we should be good for better than a week, even with the tanks down to the 50% mark (longer if applying conservation measures).


Nick
 
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   / Added a new 500 gallon LP tank... #2  
That's a lot of propane, what are you using it for besides heat in NC? My local dealer installs any tank setup you want for free if you fill the tanks after installation. I have it for a backup, I burn and heat the house with firewood in Northern Maine, do you have a pilotless heater hooked to the tank?
 
   / Added a new 500 gallon LP tank...
  • Thread Starter
#3  
The first owner of the house had a propane furnace for heat & owned the original 500 gallon tank. We replaced the HVAC equipment when we moved in and installed a heat pump & 99% efficient furnace in place of the old furnace & central air unit. The heat pump is our primary heat source now (used down to about 20 degrees), the LP furnace is a backup for very cold weather & there is a seldom used set of unvented gas logs. Prior to adding the generator, we probably used only about 50 gallons or so of LP per year. We were refilling every other year or so.

The primary driver for the new capacity is the LP powered whole house generator (22Kw) we put in last year. A 500 gallon tank only represents about 300 gallons or so of usable capacity with regards to the generator (you only start w/400 gallons & drawing down below 100 may result in insufficient vaporization rates & freezeups with regards to the BTU draw especially if you are also running the furnace). I feel 300 gallons is a reasonable level for comfort , accommodating over a week of normal household operations. Less than that gets me concerned about worst case scenerios like a region wide ice storm that has us without power & without possibility of refill for an extended period. The second tank ensures that we never drop below that 300 gallon minimum comfortable availability before being able to call for a refill.

Nick
 
   / Added a new 500 gallon LP tank... #4  
WOW!! I guess prices on 500 gal.propane tanks have sky rocketed in the past 7 years.When we purchased our new 500 gal. tank the price was $700 with install.Told my wife at the time the price seemed pretty high but I guess not.We only fill 1 time per year as we heat with wood pellets,this years august price was 90 cents per gal. I like your setup.
 
   / Added a new 500 gallon LP tank... #5  
Interesting. Our propane supplier now is charging 10 cents/gal more for their leased tanks than they do for privately owned tanks. I did the math on it and decided to keep using theirs. Your LP is expensive! Got summer fill here a week ago at $1.14. Is there any mechanism to prevent a failure in one tank from causing both tanks to bleed out?
 
   / Added a new 500 gallon LP tank...
  • Thread Starter
#6  
I asked about that with regards to the connecting line before he started. He indicated that routing it under ground reduced that potential. So, no excess flow valve in this configuration. You would need to turn a valve (or two) to prevent loss depending on leak location.

Regarding price, our daughter (60 miles away in an urban area) got quoted $2.69 as if it was a "good price"!

Nick
 
   / Added a new 500 gallon LP tank... #7  
The first owner of the house had a propane furnace for heat & owned the original 500 gallon tank. We replaced the HVAC equipment when we moved in and installed a heat pump & 99% efficient furnace in place of the old furnace & central air unit. The heat pump is our primary heat source now (used down to about 20 degrees), the LP furnace is a backup for very cold weather & there is a seldom used set of unvented gas logs. Prior to adding the generator, we probably used only about 50 gallons or so of LP per year. We were refilling every other year or so.

The primary driver for the new capacity is the LP powered whole house generator (22Kw) we put in last year. A 500 gallon tank only represents about 300 gallons or so of usable capacity with regards to the generator (you only start w/400 gallons & drawing down below 100 may result in insufficient vaporization rates & freezeups with regards to the BTU draw especially if you are also running the furnace). I feel 300 gallons is a reasonable level for comfort , accommodating over a week of normal household operations. Less than that gets me concerned about worst case scenerios like a region wide ice storm that has us without power & without possibility of refill for an extended period. The second tank ensures that we never drop below that 300 gallon minimum comfortable availability before being able to call for a refill.

Nick

I'd do a little research on the HVAC/thermostat. Should be a simple way to have the furnace go to the backup mode straight away. That will take your biggest gen draw way down and take the efficiency from about 20% to 80+% for your heating. This would significantly increase the gen run time.
 
   / Added a new 500 gallon LP tank...
  • Thread Starter
#8  
I was already planning to flip off the heat pump breaker if we have an outage during heating season. The air handler, furnace & thermostat are on a different breaker. Burning propane for heat would surely use less than turning it to electricity first...

Nick
 

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