I'm a Generac service tech and have some experience installing gaseous generators (their term). I don't have any experience with freezing, being in the Caribbean. Virtually every installation not designed by a tech will have fuel piping that is too small. The 20KW Generac Guardian needs a minimum 3/4" pipe but we typically install 1" TRACPIPE to allow for more volume. I have seen plumbers install two lengths of 4ft flexible pipe designed for stoves. A domestic stove requires about 50K btu/hr, a 20KW LPG generator requires about 400,000 btu/hr.
We normally use twin stage regulators but if the run is long we may use two separate stages. As the intermediary stage is higher pressure it can use a smaller pipe size. As I understand it, the larger pipe before the generator allows the gas to smooth out any standing waves or pulses. On Mon, Feb 17, 2014 at 8:04 PM, Ray Walters <r...@solarray.com> wrote: > Wow, so would you need a small expansion tank to dampen that out? IS > that even allowed on LPG? What was the cure? > > R.Ray Walters > CTO, Solarray, Inc > Nabcep Certified PV Installer, > Licensed Master Electrician > Solar Design Engineer303 505-8760 > > On 2/17/2014 4:19 PM, toddc...@finestplanet.com wrote: > > to further complicate things, i have seen "regulator oscillation" problems > with 2 in series. > > > > todd > > > > > > > > > > On Monday, February 17, 2014 2:30pm, "Ray Walters" > <r...@solarray.com><r...@solarray.com>said: > > Alot of these generator setups need 2 regulators, so usually the regular > one stays at the tank, size the pipe for the flow rate ( just like wire and > amps.... ;-) .) and put the 2nd regulator right at the generator. > > R.Ray Walters CTO, Solarray, Inc Nabcep Certified PV Installer, Licensed > Master Electrician Solar Design Engineer 303 505-8760 On 2/17/2014 3:17 > PM, Larry Crutcher, Starlight Solar Power Systems wrote: > > Ditto Tom, seen this too often in Mexico. I carry a manometer to make > check the pressure at the LP input to the generator with the engine > running. Make sure it is at/above 11" WC when it starts to act up. If the > regulator is at the tank, long vapor runs can cause too much pressure loss. > Larry > > > On Feb 17, 2014, at 1:36 PM, Tom Duffy <t...@thesolar.biz> wrote: > > Hi Guys > We have had "icing" problems here in Central America as well where the > gas company put in 1/2' pipe to a 12K Gillette Generator, same description > the gen would initially start and run fine but then it went erratic the > Radian didn't like it, the customer wanted to blame the Radian (I was sure > it wasn't) > The installer/dealer couldn't figure it out. I went out and immediately > saw the small pipe, plus they had bent a crimp into the incoming fuel line > as well. 3/4 " line fixed the whole thing. LP has a lot of moisture and will > always have delivery problems with funky installation of pipe. Seems that a > lot of gas guys just hook up kitchen ranges (Here) > Kind regards > *Tom Duffy* > *Senior Solar Design Engineer* > <image002.png> > *E-Mail: **t...@thesolar.biz <t...@thesolar.biz>* > *Panama Office: **507-6126-1253* > *Direct Toll Free:* *888-503-6772 <888-503-6772>* > *International: **575-539-2111 <575-539-2111>* > *SKYPE Address: **thesolarbiz* > *Although no trees were killed in the sending of this message, a large > number of electrons were terribly inconvenienced.* > *Confidentiality Notice*: This message including any attachments is for > the sole use of the intended recipient and may contain confidential and > privileged information. Any unauthorized review, use, disclosure or > distribution is prohibited. If you are not the intended recipient, please > contact the sender and delete any copies of this message. > > > _______________________________________________ List sponsored by Home > Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change > email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.orgList-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List > rules & etiquette: www.re-wrenches.org/etiquette.htm Check out > participant bios: www.members.re-wrenches.org > > > > > Sent from Finest Planet WebMail. > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out participant bios:www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts
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