Clarke is the only one available to the best of my knowledge, and I've been to a few trade shows and installed a dozen of these. They are, BTW, the cat's meow if you need to drive a lot of water down a big pipe in a hurry (think freezer Q). What designer doesn't want a flat curve at 170 PSI at pump discharge?
Cummins thought they would develop one as they transition to the new electronically controlled Tier 3 diesel engines, but as of Oct 2008 (AFSA-DC) they had no PLD offering. Clarke, on the other hand, mentioned more offerings in early 2009, since we bid a project where the largest Clarke PLD 375 HP was used, and the water supply wasn't established yet- so if we needed more oomph, we had nowhere to turn. They should be up to 600+ HP soon- so you'll need an RPZ to prevent testosterone from going back into the public supply. And I don't know that #20 "allows" as much as "requires" the PLDs in situations where we used to just truncate the water supply by dumping a zillion gallons into the retention pond. Any one with better info than I have on electrics please chime in, but on the last time we looked at an electric driven PLD pump, i.e., using VFD, my vendor observed the controller was $75k, did he still need to price the pump and motor? Nah, slide another Clarke down to this end of the bar. glc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Frans Stoop Sent: Friday, December 19, 2008 11:12 AM To: [email protected] Subject: Variable speed pressure limiting fire pumps Gentlemen, NFPA 20 par. 5.7.6.3 allows Variable Speed Pressure Limiting Control (VSPLC). According to the distributors that I spoke with, Clark seems to be the only fire pump manufacturer in the US who actually can provide listed fire pumps with VSPLC. My question is: is that true? Or are there other manufacturers who also market diesel driven VSPLC fire pumps with a listing? If so, which one(s)? Frans Stoop TOS architecture & fire protection Netherlands <[email protected]> Tel. +31-24-324 0112 _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
