ford37502 Show full post »
78buckshot
Our package is in the same ballpark as d11, we subcontract the electrical with the same co. that does all our residential and commercial electrical.
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ford37502
Thanks for the inputs re: cost of install....looks like the costs vary all over the place, so I think I owe it to myself to do some local leg work. My LP supplier comes tomorrow to run the high pressure side from my tank to the generator location. Does anyone know if there is a minimum distance from the regulator to the generator ??? I've seen a lot of installation pictures on this site that have the regulator installed very close to the generator, but I've been told that it should be at least 60" from a "source of ignition" which would be the generator itself in this case...
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genme
ford37502;12086 wrote:
...I've been told that it should be at least 60" from a "source of ignition" which would be the generator itself in this case...

Look at NFPA 58 sec 3.2.12.5.
Could be more in other areas, such as MI where 6' has been mentioned.

Our secondary LP regulator is very close to our generator, however the vent on the regulator is piped about 6' away. Others here can comment on preferred distance between the regulator and the generator and pipe size.
Model 5875, Nexus controller, 999cc Engine, 20kW LP, 2011
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ceb58
You want the secondary regulator as close as possible to the gen. set. Even if it means piping the vent away from the unit.
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d11gnccer
ceb58;12089 wrote:
You want the secondary regulator as close as possible to the gen. set. Even if it means piping the vent away from the unit.


Not so. In my last update class at Generac Eric stated you need some pipe as an expansion chamber before going into the generator. The diaphragms in the generator and secondary can fight each other if not. The recomendation of 2 or 3 feet and even upsizing to a 2" pipe then back down was even made.
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ceb58
d11gnccer;12137 wrote:
Not so. In my last update class at Generac Eric stated you need some pipe as an expansion chamber before going into the generator. The diaphragms in the generator and secondary can fight each other if not. The recomendation of 2 or 3 feet and even upsizing to a 2" pipe then back down was even made.


And that is Generacs "cover our butt" take on it. When I say close as possible the secondary will be in a 12'' to 16'' range. For the real world I have 15- 35Kw LP units running carrying around a 20 to 25 Kw load. The secondary off of the 3/4" line is in the 12" distance range. They have been running fine for 4 years now (if you can believe that from a Generac)
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HKFever
d11gnccer;12137 wrote:
Not so. In my last update class at Generac Eric stated you need some pipe as an expansion chamber before going into the generator. The diaphragms in the generator and secondary can fight each other if not. The recomendation of 2 or 3 feet and even upsizing to a 2" pipe then back down was even made.


Since the vapor area in a tank is so critical it makes sense to have an "expansion tank" so to speak. I could even see having a 3" x 3' section to allow for full vaporization and sufficient feed volume. I would like to see the stats for issues with high pressure supply at genset compared to over sized piping with low pressure supply. Generac could offer a 6" x 1' expansion tank with 1" inlet and outlet fittings as an optional canister to prevent starving the engine of fuel. Even in a low pressure setup it would give you extra supply volume.
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Skip Douglas SkipD
I was in the industrial process control systems business for 39 years before retiring. Most precision regulators that I've dealt with work better with a volume chamber of some sort between the regulator and wherever the pressure controlled gas goes. The volume chamber could be a section of larger diameter pipe or a small tank tee'd off the line.
Skip Douglas
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ford37502
When my LP tech installed my new line from the tank (165 feet) he installed the secondary regulator at about 8 feet from the Generator attachment point. Code in my area states that the regulator must be no closer than 5 feet from any source of ignition which is interpreted as any part of the gen set enclosure. He'll run 1/2" black pipe attached to the house the final 8 feet to the gen set flex line attachment point once the gen set is in place.
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HKFever
ford37502;12157 wrote:
When my LP tech installed my new line from the tank (165 feet) he installed the secondary regulator at about 8 feet from the Generator attachment point. Code in my area states that the regulator must be no closer than 5 feet from any source of ignition which is interpreted as any part of the gen set enclosure. He'll run 1/2" black pipe attached to the house the final 8 feet to the gen set flex line attachment point once the gen set is in place.


What size genset are you getting?
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HKFever
1/2" black iron pipe at eight feet will give you approx. 300k BTU/HR and your machine at full load draws 267,120 btu/hr if your Propane is rated for 2520 btus per cubic foot.
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ford37502
HKFever... thanks for the input... Some of you guys on this site are SCARY with your knowledge !!!! Thanks for sharing with the rest of us. Muchly appreciated
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