[RE-wrenches] AC Back feed from Radian.

[Chris Mason]

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 <ray at 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, toddcory at 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" <ray at solarray.com><ray at 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 <Tom at 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: **tom at thesolar.biz <tom at thesolar.biz>*
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-- 
Chris Mason
President, Comet Systems Ltd
www.cometenergysystems.com
Cell: 264.235.5670
Skype: netconcepts
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