Listing not required for13D applications. 13D 2007 5.1.3 Mike Cabral ---- "Travis Mack wrote: > As a follow up, is the expansion tank req'd to be UL Listed? I have heard > yes and no. > > T > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Ron Greenman > Sent: Wednesday, October 22, 2008 11:54 AM > To: sprinklerforum@firesprinkler.org > Subject: Re: sizing expansion tanks > > There's a story, which may or may not be true, but that's of no matter, that > is about Neils Bohr's final examinations that goes as > follows: > > The Question: > > "Describe how to determine the height of a skyscraper with a barometer." > > One enterprising student replied: "You tie a long piece of string to the > neck of the barometer, then lower the barometer from the roof of the > skyscraper to the ground. The length of the string plus the length of the > barometer will equal the height of the building." This highly original > answer so incensed the examiner that the student was failed immediately. > The student appealed, on the grounds that his answer was indisputably > correct, and the university appointed an independent arbiter to decide the > case. > > The arbiter judged that the answer was indeed correct, but did not display > any noticeable knowledge of physics. To resolve the problem it was decided > to call the student in and allow him six minutes in which to verbally > provide an answer which showed at least a minimal familiarity with the basic > principles of physics. > > For five minutes the student sat in silence, forehead creased in thought. > The arbiter reminded him that time was running out, to which the student > replied that he had several extremely relevant answers, but couldn't make up > his mind which to use. On being advised to hurry up the student replied as > follows: > > Firstly, you could take the barometer up to the roof of the skyscraper, drop > it over the edge, and measure the time it takes to reach the ground. The > height of the building can then be worked out from the formula H =3D 1/2gt > squared (height equals half times gravity time squared). But, bad luck on > the barometer. > > Or if the sun is shining you could measure the height of the barometer, then > set it on end and measure the length of its shadow. > Then you measure the length of the skyscraper's shadow, and thereafter it is > a simple matter of proportional arithmetic to work out the height of the > skyscraper. > > But if you wanted to be highly scientific about it, you could tie a short > piece of string to the barometer and swing it like a pendulum, first at > ground level and then on the roof of the skyscraper. The height is worked > out by the difference in the gravitational restoring force (T =3D 2 pi sq > root of l over g). > > Or if the skyscraper has an outside emergency staircase, it would be easier > to walk up it and mark off the height of the skyscraper in barometer > lengths, then add them up. > > If you merely wanted to be boring and orthodox about it, of course, you > could use the barometer to measure air pressure on the roof of the > skyscraper, compare it with standard air pressure on the ground, and convert > the difference in millibars into feet to give the height of the building. > But since we are constantly being exhorted to exercise independence of mind > and apply scientific methods, undoubtedly the best way would be to knock on > the janitor's door and say to him "I will give you this nice new barometer, > if you will tell me the height of this skyscraper". > > The arbiter re-graded the student with an 'A'. – > > Kudos to Russell for finding the simplest answer to the posed question. > A+!!! > > On Wed, Oct 22, 2008 at 11:27 AM, Russell <[EMAIL PROTECTED]> > wrote: > > I have a copy of an article written by Greg Cagle which appeared in > > the Sprinkler Age magazine in Jan. of 1997. It goes into great detail > > with formulas. Formulas that went so far over my head that I just call > > the manufacturer and let them tell me what size I need. I'll fax this > > to you if you like. > > > > Russell Rewis > > Brown Automatic Sprinklers, Inc. > > 107C Hemlock Street > > Valdosta, Georgia 31601 > > 229-244-8130 > > [EMAIL PROTECTED] > > > > > > > > Subject: sizing expansion tanks > > > > > > Travis Mack, SET > > > > > > _______________________________________________ > > 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) > > > > > > -- > Ron Greenman > at home.... > _______________________________________________ > 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) > > __________ NOD32 3546 (20081022) Information __________ > > This message was checked by NOD32 antivirus system. > http://www.eset.com > > > _______________________________________________ > 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]
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