SWB installed an NG on the roof I wanted on. It had a compressor that fueled a turbine. The first time it ran more than 30 minutes if sucked the gas or if the whole downtown system and all the boilers went out.
On Sat, Dec 3, 2016, 6:23 PM Chuck McCown <[email protected]> wrote: > Many times it is in water column inches. I used to know the normal > amount. 4 inches I think and Propane is 12? Something like that. Very > low pressures. > For high flow you use two regulators. On LP the first takes tank pressure > down to 9 psi and then the one at the generator takes it down to 12 > inches. > > *From:* Lewis Bergman > *Sent:* Saturday, December 03, 2016 2:24 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] generator fuel > > > I tried to put an NG gen set on top of a building and the has company said > they didn't have enough pressure > > > I think I needed a few pounds and they only had 6 ounces. > On Sat, Dec 3, 2016, 10:04 AM Chuck McCown <[email protected]> wrote: > > Just cruising the used generators on Ebay. They seem to be a pretty good > value. Found several with 250-400 hours in that price range. > Wondering which brand has the best reputation of longevity. > > *From:* Mark Radabaugh > *Sent:* Saturday, December 03, 2016 7:18 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] generator fuel > FWIW I purchased a new CAT 125KW diesel genset with a 420 gallon base > tank and transfer switch for ~33k last year. I think 10k might be a > little low, but not too far off. > > Mark > > > > On Dec 2, 2016, at 9:39 PM, Chuck McCown <[email protected]> wrote: > > > It is more than a half mile away. Primary build. Not sure they would > even do it as that is at the end of a crappy line feeding a center pivot > irrigation pump and system. Up where I need it everything is underground. > > Right now I am paying about $2K/month at a different site for a similar > load. They really screw you on the demand charge. > I figure I can get a decent $100K NG 3ph generator for $10K. > > > *From:* George Skorup > *Sent:* Friday, December 02, 2016 7:29 PM > > *To:* [email protected] > *Subject:* Re: [AFMUG] generator fuel > > OK, but what would be the cost to have your power co bring 3phase to you? > More or less than a 3-phase generator? Or can they simply not do it? > > On the other hand, what would it then cost you for 3-phase service from > said power co? I know of a couple grain handling sites around here pay > about $1200/mo. But that's cheaper over the long haul than buying, > maintaining and paying fuel cost for a 100kW genset, even NG. > > On 12/2/2016 8:18 PM, Chuck McCown wrote: > > Not bad considering my NG is going to cost half or less than diesel. And > it will be periodic use, not constant. > I need to make a boatload of 3 phase 480 where only single phase exists an > the loads will be highly variable. > I could use a big ass rotary phase converter but based on the cost of fuel > alone, I will save money just running the generator when needed. > Especially true if they charge me a demand charge. > > > *From:* Eric Kuhnke > *Sent:* Friday, December 02, 2016 7:11 PM > > *To:* [email protected] > *Subject:* Re: [AFMUG] generator fuel > > Looking at it another way, I have calculated previously that the cost per > kWh for 24x7 power from a diesel generator is in the range of $0.35 to > $0.49 per kWh. That's including the purchase cost of the generator, > maintenance, expected lifespan, cost of fuel, etc. > > If you want to see prime power examples of diesel used for islanded grid > power, each town in Nunavut has its own set of diesel generators and tanks. > There is no long distance transmission setup or inter-city grid. > > http://www.qec.nu.ca/home/ > > On Fri, Dec 2, 2016 at 5:57 PM, Chuck McCown <[email protected]> wrote: > > I agree, but my application is primary power, not emergency. > > > *From:* Eric Kuhnke > *Sent:* Friday, December 02, 2016 6:53 PM > > *To:* [email protected] > *Subject:* Re: [AFMUG] generator fuel > > I don't think it's fair to directly compare diesel fuel to natural gas, > because one is portable in just about any container (in a real emergency), > the other is not. > > > http://www.datacenterknowledge.com/archives/2012/10/31/peer-1-mobilizes-diesel-bucket-brigade-at-75-broad/ > > On Fri, Dec 2, 2016 at 5:49 PM, Chuck McCown <[email protected]> wrote: > > I am assuming a BTU of fuel will make so many Wh of energy. > > If perfectly efficient 1M BTU =292.3 kWh > > That would cost me *$35* from the power utility. > > > A gallon of diesel is abou $3.25 around here. 139000 btu. > Diesel then is about $23 per 1M btu. > > However diesel engines are only 30% efficient so it will cost me *$76* in > fuel to make that 292.3 kWh > > > If that assumption is approximately correct: > I pay about $7.80 per decatherm in the winter for NG. A decatherm is 1 > million btu > About half that in summer. > > > $7.80/.3= *$26*/293.3 kWh for NG not considering depreciation and maint > of the generator. > > > It seems to me that NG is the hands down fuel cost winner? Anyone see > mistakes in this? > > >
