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Onan Generators

Onan 45EM Project


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  #21  
Old 09-28-2017, 11:11:22 AM
I like oldstuff I like oldstuff is offline
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Default Re: Onan 45EM Project

For a perspective, I have about 50 feet of piping from the meter and running a 15kW. 1 1/4 is used. This is on the typical 7-11" WC nat gas pressure.
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  #22  
Old 09-28-2017, 01:12:28 PM
Utah Onan Utah Onan is offline
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Default Re: Onan 45EM Project

/\ Birken Vogt is correct, you can set it all up and with what you are doing, you probably won't see any issues. I've seen plenty of restaurants with that same AC-250 gas meter flowing way more gas than it was "supposed to" but haven't had any problems. Some meters as they are used above their limits begin to lose their accuracy. They can err either way - in favor of the customer or the gas company.
He also brings up a good point in that how often is your generator run at full rated load. At best I would guess intermittently.

/\I like oldstuff also has good perspective. I too ran an underground gas line to my detached garage for a heater out there as well as for my Onan. 130' long of 1 1/4" pipe however mine is up to 2 PSI. Overkill.... most likely
All I know is that it will handle what ever I attach to it!
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  #23  
Old 09-28-2017, 01:18:00 PM
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Default Re: Onan 45EM Project

Thanks for the replies. I looked and the gas company only has a 3/4 inch line coming to my meter.
I practically got this generator for free at an auction and am replacing an older 15kw generator that ran just fine on the natural gas line. That being said my real load is only around 50 amps at 240 volts which is 12kw. This would be about 40% loading for the generator rating at single phase 240. Do you think I can get buy with the 3/4 pipe at this low load? I can always put a smaller output breaker in the generator as a pecaution.
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  #24  
Old 09-28-2017, 02:16:10 PM
Birken Vogt Birken Vogt is offline
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Default Re: Onan 45EM Project

Do you have a regulator right at the meter? Most do. If so the 4 feet of 3/4 or less in and out of the meter is not a significant restriction. Just expand it to 1.5" pipe and run the rest of the way to the generator as soon as practical. It does not have to be the large size pipe all the way.
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  #25  
Old 09-28-2017, 02:27:29 PM
Utah Onan Utah Onan is offline
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Default Re: Onan 45EM Project

Quote:
Originally Posted by radiotech View Post
I looked and the gas company only has a 3/4 inch line coming to my meter.
That's the line coming out of the ground, correct? The gas company's pressure is much greater than what you're getting. So even though the line is small, the higher pressure helps to deliver the necessary volume to your home.

I agree with what Birken suggest. Do what he is saying.
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  #26  
Old 09-28-2017, 03:51:16 PM
Birken Vogt Birken Vogt is offline
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Default Re: Onan 45EM Project

Snap a picture of your riser/regulator/meter setup and show us what you have. Especially the badge on the meter.

Utah Onan, I have been trying for years now to find the meter pressure drop curves. I know I once saw them in an older publication somewhere. Are there any old meter books in your company?
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  #27  
Old 09-28-2017, 06:47:27 PM
Utah Onan Utah Onan is offline
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Default Re: Onan 45EM Project

Yes Birken we have some books about American Meter's products. I'll have to ask the boys in the meter shop. They'll tell me anything we want to know.



... and we have books and data about all the other stuff we use too.
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  #28  
Old 09-28-2017, 07:46:09 PM
radiotech radiotech is offline
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Default Re: Onan 45EM Project

OK I have 1-1/4" Poly pipe and will run that since I will never run full load of 125 amps. I confirmed the distance to the meter is 12 feet. So when I get done the black pipe and poly pipe from the meter to the generator will all be 1-1/4". I don't know what size the pipe from the road to the meter is but if you look at the attached riser nameplate it shows the riser is 3/4".
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  #29  
Old 09-28-2017, 09:52:17 PM
Birken Vogt Birken Vogt is offline
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Default Re: Onan 45EM Project

Bummer that it is an R200. That is like an extra small meter.

https://webcache.googleusercontent.c...&ct=clnk&gl=us

Still it might work. I would give it a try. Otherwise the rest of the system is almost surely up to par.
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  #30  
Old 10-11-2017, 01:34:54 PM
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Default Re: Onan 45EM Project

Well I got my 1-1/4 gas line installed.
I brought the tracer wire up at the gas meter and at the generator.
Is either end of the tracer supposed to be grounded?
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  #31  
Old 10-11-2017, 03:22:12 PM
Birken Vogt Birken Vogt is offline
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Default Re: Onan 45EM Project

Tracers do not need to be connected to anything.
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