If copper has to be guarded what about titanium?
> On Feb 24, 2017, at 10:38, å... .... <[email protected]> wrote: > > > > > 1. I don't remember mentioning melted lead-ins to wharf systems, but my > neighbor claims that my brain is insane. That is a possibility. The hazard > too, but what is more, if a fire occurs at the wharf-to-shore tie-in, could > not one apply suppression from the landside wagon? > > 2. I know the committee is about listings and the right to print money that > goes along with that. That process has my respect, as do the people with the > funding, integrity and fortitude to go through such verification operations. > But HDPE seems like it has some long legs. Plastic, its the flexibility, if > only for a few million cycles of that type of loading. It's also that > corrosion thing. > Maybe John Irwin might share with us -- > a. what has been the age of the longest plastic pipe system or either > in-service or de-commissioned? > b. what is the best guess as to mean time between failures? > c. Maybe Charles Thurston will pull some of that fallen pipe out of the > muck, inspect it and make an estimate on its projected service life. Please > share that experience with us. > > > 3. Corrosion > There is a reason that the UFC 3-600-01 banned galvanized piping. It has > low reliability relative to its cost. > Almost anyone making claims against entropy (corrosion) has my suspicion. > > While preparation work and custom application is important, it is > years-in-service with low down time, which is THE metric. > And in the ends, death (by corrosion) and taxes usually wins. > > Pipe deep under the salt-water line usually fairs better than pipe above; > It's the oxygen. > The North Sea can be a harsh mistress. Norsk company Trelleborg > responded with Elastopipe™ . > For those that live by the listing, Elastopipe has certs from Lloyds, > ABS, USCG and some Russian test agency. > > Another pipe type that sounds highly exotic but works like a charm is: > titanium. > Titanium pipe costs at least 10-by that of zinc, in a deflationary > market, but its demand is such that you get your investment back when you > "haul it out of the muck" > Resell it for salvage and make out a net-sum winner. Perfect > offshore application, but onshore, for sure, it will be stolen. > > My bet is on HDPE. Some HDPE has been sitting outside for years, at > contractor's storage yards in deserts, and then goes into service. > Some of that pipe has been without the claimed 'radiatively protecting' > soot pigmentation. > > > 4. Wharf design. Clients that are looking for that HPR, might want to > consider whether the wharf itself is an unacceptable exposure. > Depending upon the vessels that are moored, it may be worthwhile projecting > suppressant underneath the wharf. While a low probability > fire, a leaking fuel oil tanker could lay a long fire exposure onto the > wharf. But I sense the likelihood of that fire is so low that it is > acceptable to not protect for it, for all except perhaps the FLNG, FPSO type > platforms, which often don't moor to shore -- but rather > tether to their floating dolphins. > > 6. (see, my neighbor was right) When crafting Code, we can't think of every > application that the future will bring. Try leaving the designers mind's > open to the > wisdom and intuition behind the written framing. I have seen too many > designers spending weeks trying to fit a linear requirement for listed > equipment around an application whose corners could have been squared fast > and neatly if only there had been more emphasis on effectiveness. > > Scot Deal > Excelsior Fire & Risk Engineering gsm: +420 608 318 498 > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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