How big are the freezers? Is stainless steel that expensive? On Wed, Oct 4, 2017 at 10:38 AM, rongreenman . <[email protected]> wrote:
> I think their are too many variables for any definitive answer. Chemistry > of the pipe. Chemistry of the water. How they react to each other. And the > nature of and how the biologicals interact with their environment. > > On Wed, Oct 4, 2017 at 7:13 AM John Paulsen <[email protected]> wrote: > >> Thanks guys, I DO find all of this helpful, but I was hoping to hear from >> someone that had experience with the “environmental” conditions of this >> freezer project and if they had noticed that the constant freezing >> conditions had inhibited corrosion in the pipes. >> >> >> >> I agree that under normal freeze thaw cycles, periodic trip testing and >> condensate water held in the pipe by roll grooves would best be controlled >> by all of the points mentioned in the thread. I have seen SO many horror >> stories in attics over the years with plugged lines from fine scale being >> compacted more at every trip test. I have no trouble explaining to clients >> why the internal inspection of their system is a critical “must do” >> maintenance item. But I would like to keep the pipe sizes on this project >> as small as possible in order to meet the trip times required by the CMSA >> head that we are using. If we spec schedule 40, it essentially increases >> the pipe size a diameter. >> >> >> >> If it’s justified I will do so. But I have this nagging doubt that the >> freezing temps will preserve the schedule 10… if the seams are fabbed on >> top of course… >> >> >> >> *From:* Sprinklerforum [mailto:sprinklerforum- >> [email protected]] *On Behalf Of *Andy Kaempfer >> *Sent:* Wednesday, October 4, 2017 9:36 AM >> *To:* [email protected] >> *Subject:* RE: Schedule 10 vs Schedule 40 pipe >> >> >> >> Hi John, >> >> >> >> The most effective measure would be cut grooved sch. 40 black steel using >> Nitrogen as your supervisory gas instead of shop air. This will eliminate >> the dam effect at the joint. However, the biggest value for your customer >> will likely be roll grooved sch. 10 black steel and still using Nitrogen as >> your supervisory gas. >> >> >> >> Many arguments can be made about the CRR value which is nothing more than >> a comparison of the thickness of schedule 40 pipe under the first exposed >> thread. The “first exposed thread” is the minimum pipe thickness exposed to >> both interior and exterior corrosion. It occurs at the threaded joint at a >> line defined by the thread width just before the pipe engages the fitting. >> There are too many factors to consider when identifying corrosion rates and >> this ratio is very subjective. Strictly a comparison. >> >> >> >> As for using Nitrogen as a supervisory gas I think this is definitely the >> biggest “bang for your buck”. In your particular instance Nitrogen provides >> you with more than just a corrosion mitigation solution. In particular the >> low dewpoint of 98%+ N2. A typical refrigerated dryer will only get you >> somewhere around -40°F dew point and 98% Nitrogen will be somewhere around >> -60°F dew point (that’s a 50% increase in humidity reduction). >> >> >> >> Hope you find this helpful. >> >> >> >> Andy L. Kaempfer >> >> Senior Application Engineer – Fire Protection Systems >> >> Bull Moose Tube Company >> >> 1819 Clarkson Road >> >> Chesterfield, MO 63017 >> >> O: 636-812-9276 >> >> F: 636-530-5880 >> >> M: 314-306-2471 >> >> [image: BullMooseCorporateTagline-black] >> >> >> >> >> >> *From:* Sprinklerforum [mailto:sprinklerforum- >> [email protected] >> <[email protected]>] *On Behalf Of *John >> Paulsen >> *Sent:* Tuesday, October 3, 2017 12:34 PM >> *To:* [email protected] >> *Subject:* Schedule 10 vs Schedule 40 pipe >> >> >> >> Hello Forumites: >> >> >> >> We are working to develop a bid package for a pair of large freezers and >> coolers used for food stuffs storage on racks to 35’. The freezers are to >> be -10 degrees and the coolers will be 31 degrees. The sprinklers systems >> will be double interlock pre-action with Protecto-wire detection and CMSA >> sprinklers. >> >> >> >> My question: The owner is asking for a recommendation on whether to >> spec schedule 10 or schedule 40 piping. The concern is long term >> serviceability of the piping system. My initial thought is that due to the >> constant low ambient temperatures corrosion would be seriously inhibited >> for two reasons; any condensate in the pipe would be in frozen form and the >> low temps would inhibit microbial growth. So my thought is that schedule 10 >> pipe would last the 20 year expected service life of the system. However, I >> would like to get the thoughts of the forum participants, is the cost of >> schedule 40 warranted or would schedule 10 service just as well in this >> application? >> >> >> >> Thanks in advance for your responses. >> >> >> >> John Paulsen – SET >> >> Crown Fire System Design >> >> 6282 Seeds Rd. >> >> Grove City, OH 43123 >> >> P – 614-782-2438 >> >> F – 614-782-2374 >> >> C – 614-348-8206 >> >> >> >> >> >> >> >> *Disclaimer* >> >> The information contained in this communication from the sender is >> confidential. It is intended solely for use by the recipient and others >> authorized to receive it. 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