Isn't Bromine becoming more prevalent than chlorine in the pool business? How does SS stand up to the intended pool treatment if its not chlorine?
Is there a contingency plan for when the pool is emptied? I suppose it being a secondary water source makes it less significant, but I recently got permission to go back to city water from the last "swimming pool as sole pump suction" job, and one of my points was that if someone drops a tootsie roll in the pool, they'd have to empty the apt complex while the pool was emptied and foreign object analyzed since they'd have no FP at all (except the "Schirmer 13 system" of standpipes, smokes and extinguishers that are apparently all the elderly need in SoCal highrises to be completely safe from fire). We certainly are able to use SS piping in spkr systems, and I believe when I did a cooling tower in SS a 6" vic coupling, SS, was $120, 15 or 20 years ago, probably why we don'tuse it as a first choice except maybe revengeful T&M. We can use 4" PVC to feed a 13R pump, I wouldn't expect any implosion under suction SS whether its sch 10 or 40. We can run Sch 5 black steel for pump suction, and I believe the SS is much stronger material than A795 requires. glc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Type 304L stainless has corrosion resistance handling finished potable waters with a chlorine content of up to 2ppm. 316L and higher alloys can handle water with up to 5ppm chlorine. Craig L. Prahl, CET -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Charles McKnight Stainless steel is a good product in a lot of applications. However, in a situation where you have chlorine in the water it may not be the best choice. Chlorine can attack some stainless steels and cause stress cracking. Regards Chuck McKnight Battelle Energy Alliance On 6 Oct 2007 at 16:34, Dave Phelan wrote: Greetings again all, I am in the process of reviewing plans for the secondary water source to a high-rise residential building where they are taking water from the pool on the parking garage roof and piping to the grade level fire pump room. All indications are that there is enough head pressure to overcome friction and fitting loss even at the max. 1500 GPM flow to make this a do-able solution. They have selected to use 8" sch 10 or 40 stainless steel piping for the approx. 215 foot distance between the pool drain and pump room, which happens to be exposed overhead - aboveground piping through two levels of an open parking garage. They are indicating that this is the best material for the application since chlorinated pool water will sit in the pipe indefinately awaiting a seismic event. Here's my dilemma(s): a. I have no previous experience in reviewing or inspection systems with stainless piping. I also dont think it is listed as an approved AG material in NFPA 13 or 24 of any edition. (99,02,07). Does anyone on the list know of a type / brand of fire protection listed stainless steel pipe? b. Is this really the best material for the application? I mean sure I hear the word on the street is stainless is very resistant to ACQ lumber and for boat railings .... does that also mean its right for pools supplying sprinkler systems? I was also wondering since this is almost a near vacuum application, versus a pressure application, would stainless be as resilent and durable with the atmosphere pushing in on it from the outside and large volume flows and a fire pump pulling in on it from the inside. c. I understand from the plumbing consultant who is working on the plans (YIKES!!) that Victaulic makes a grooved coupling and fittings that are stainless ... but could not tell me if they are also listed for FP use since I have seismic design and differential movement requirements in the project and somewhere along that piping I will need 'flexible' couplings. Much appreciate the assistance once again. Dave P. An AHJ in New Jersey _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
