tjcin
After at least 5 years of service I had to replace an LPG regulator. I didn't think anything of it until I was questioned by my friend(a fuel oil and LPG dealer). By the way he is not the supplier of LPG to this perticular generator. I installed the 14kw generator and gas piping originally. Here is how it is done: Approx 30' from the generator there is a 100 gallon bottle just for the generator, no other appliances. I piped it to the generator in 1/2" threaded pipe above ground. Installed a sediment tee, shutoff valve and I used the provided flex hose. At the LPG bottle, the provider installed a 2 stage regulator. Until now the machine has run great. In your opinion, should I have used a high pressure and then a low pressure regulator in lieu of a 2 stage? My friend the LPG dealer used his pipe calculation info and said that 1/2" threaded pipe is not enough volume for the machine to run at full load if low pressure LPG is flowing through it. Give me your thoughts please. Keep in mind the generator has performed great during many power outages.
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ohmslaw
You are just shy of the fuel requirements at full load. I would love to see a load bank on this at 14kw to see what happens. We always pipe first stage/ second stage if it is over 10 feet. We also always pipe with 3/4 iron when we use a twin stage regulator. The books say that there is less chance of a freeze up using two regulators opposed to the twin stage regulator.
I have a customer who piped a 17 KW with 30 feet of 1/2 inch copper
at 14 "WC. He does not believe me when I tell him it will not work properly when loaded. He says the unit starts and runs fine .I believe your piping arrangement is capable of 180,000 Btu and you need around 211,000.
Tim
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ceb58
tjcin;7968 wrote:
After at least 5 years of service I had to replace an LPG regulator. I didn't think anything of it until I was questioned by my friend(a fuel oil and LPG dealer). By the way he is not the supplier of LPG to this perticular generator. I installed the 14kw generator and gas piping originally. Here is how it is done: Approx 30' from the generator there is a 100 gallon bottle just for the generator, no other appliances. I piped it to the generator in 1/2" threaded pipe above ground. Installed a sediment tee, shutoff valve and I used the provided flex hose. At the LPG bottle, the provider installed a 2 stage regulator. Until now the machine has run great. In your opinion, should I have used a high pressure and then a low pressure regulator in lieu of a 2 stage? My friend the LPG dealer used his pipe calculation info and said that 1/2" threaded pipe is not enough volume for the machine to run at full load if low pressure LPG is flowing through it. Give me your thoughts please. Keep in mind the generator has performed great during many power outages.


First I would ask is how is the unit running now with the new regulator? If it runs fine the way it is then so be it.

From a personal stand point I do not/will not install less than 3/4" as most of the mfg. instructions recommend no less. I install the primary reg. on the tank and the secondary at the unit. Most units will run at 10-14 inches of water column. At this WC the pressure is less than 1/2 lb psi. This is probably why your friend is concerned. From the primary the pressure would be in the 100lb psi range to the secondary. If there were a heavy load coming on, the low pressure from that distance may not be enough flow for the gen. to maintain correct speed. With the secondary installed at the unit it is a very shot distance to the flow regulator on the gen.

It all comes down to supply and demand. If your gen. has been operating fine with the set up you describe then the supply is adequate to maintain the load on the gen.
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josephteel
GAs volume is likely a problem in col or cooler weather and load variations

a 100 Gallon bottle of propane is not recommended. check your manual for fuel tank applications under tenperatures and generator KW sizes/fuel demands.
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