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: > [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:[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. If you are not the recipient, you are hereby > notified that any disclosure, copying, distribution or taking action in > relation of the contents of this information is strictly prohibited and may > be unlawful. > > This email has been scanned for viruses and malware, and may have been > automatically archived by *Mimecast Ltd*, an innovator in Software as a > Service (SaaS) for business. Providing a *safer* and *more useful* place > for your human generated data. Specializing in; Security, archiving and > compliance. To find out more Click Here > <http://www.mimecast.com/products/>. > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > -- Sent from Gmail Mobile
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