sorta-OT, VFD's on firepumps
So I got roped into an interesting project, a log cabin in Califunny. It will have a small (80,000 gallon indoor) pool, 20KW of PV solar array, and lots of other complications. We're doing everything in 208/3ph [but actually take a PG&E feed at 4160vac]. This makes things both easier & interesting. To meet fire regulations, there will be 10,000 gal of potable water storage and one pump that feeds both domestic users and the NFPA 13D sprinklers. The code requires one pump so that the owners don't just neglect the sprinker pump. They use a VFD drive to meet the varying needs of one faucet or a dozen sprinker heads. But thus far, I can't find a system that put in the added diodes to run from 3 phase... Argh. Anyone seen a VFD-driven firepump that takes 208/3ph in? -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
sorta-OT, VFD's on firepumps
David Lesher wrote:
So I got roped into an interesting project, a log cabin in Califunny. It will have a small (80,000 gallon indoor) pool, 20KW of PV solar array, and lots of other complications. We're doing everything in 208/3ph [but actually take a PG&E feed at 4160vac]. This makes things both easier & interesting. To meet fire regulations, there will be 10,000 gal of potable water storage and one pump that feeds both domestic users and the NFPA 13D sprinklers. The code requires one pump so that the owners don't just neglect the sprinker pump. They use a VFD drive to meet the varying needs of one faucet or a dozen sprinker heads. But thus far, I can't find a system that put in the added diodes to run from 3 phase... Argh. Anyone seen a VFD-driven firepump that takes 208/3ph in? That is wild. We had a major fire where I used to work. After the fire was out and the insurance company had to pay, they came up with a spec on GPH delivery that the village could not meet. This got us into the realm of a water tower and other expensive ideas. We ended up with a booster pump that litteraly sucked on the fire water supply main enough to meet the insurance companies specs. Getting back to your problem, that sounds bit insane. A really big bladder tank sounds like the way to go so you don't run the monster pump often. Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller |
sorta-OT, VFD's on firepumps
On Mon, 26 Apr 2010 19:24:23 +0000 (UTC), David Lesher
wrote: So I got roped into an interesting project, a log cabin in Califunny. It will have a small (80,000 gallon indoor) pool, 20KW of PV solar array, and lots of other complications. We're doing everything in 208/3ph [but actually take a PG&E feed at 4160vac]. This makes things both easier & interesting. To meet fire regulations, there will be 10,000 gal of potable water storage and one pump that feeds both domestic users and the NFPA 13D sprinklers. The code requires one pump so that the owners don't just neglect the sprinker pump. They use a VFD drive to meet the varying needs of one faucet or a dozen sprinker heads. But thus far, I can't find a system that put in the added diodes to run from 3 phase... Argh. Anyone seen a VFD-driven firepump that takes 208/3ph in? Any 3phase firepump will work on a VFD at the proper voltage. Now..finding a fire pump that has a 3 phase motor on it...thats something I know idea about. Or removing the single phase motor and putting on a replacement 3ph. Put a 3 minute timer to the fire alarm, a loud warning indicator and then have it automatically turn on the VFD. G Gunner "First Law of Leftist Debate The more you present a leftist with factual evidence that is counter to his preconceived world view and the more difficult it becomes for him to refute it without losing face the chance of him calling you a racist, bigot, homophobe approaches infinity. This is despite the thread you are in having not mentioned race or sexual preference in any way that is relevant to the subject." Grey Ghost |
sorta-OT, VFD's on firepumps
Gunner Asch writes:
Any 3phase firepump will work on a VFD at the proper voltage. The pump is the easy part. Put a 3 minute timer to the fire alarm, a loud warning indicator and then have it automatically turn on the VFD. G CalFire/NFPA 13D require there be one pump for potable water and fire; seems too many homeowners neglected the sprinkler-only pump. That's why the VFD's are used. When the flow-switch on the sprinkler line trips, it's time to boogy. I could use an ordinary VFD but the ones from pump companies offer many advantages: low flow/high flow protection, low/high suction, pump overheat, etc. I found the ITT Technologic 502 which does EVERYTHING including RS-485. But I'm hoping for something less exotic. -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
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