Just found CPVC. It's even higher: 37 x 10^-6. Yikes! Dave
David A. de Vries, P.E., CSP Firetech Engineering Incorporated 2715 Harrison St. Evanston, IL 60201 Tel: 847-733-0944 Fax: 847-866-6255 --- On Wed, 11/10/10, David de Vries <[email protected]> wrote: From: David de Vries <[email protected]> Subject: Re: Pipe Expansion To: [email protected], "Coastal" <[email protected]> Date: Wednesday, November 10, 2010, 11:01 PM Coefficient of Thermal Expansion Carbon Steel: 6.7 x 10^-6 (or 0.0000067) Copper: 9.3 x 10^-6 PVC: 28 x 10^-6 Wood, fir: 2.1 x 10^-6 Wood, oak parallel to grain: 3.0 x 10^-6 In all cases multiply the coefficient times the length of the pipe in feet and the temp change in degrees F. The result will be in feet of expansion, so multiply by 12 to get inches. In your case, the steel pipe is expanding 2 to 3 times more than your wooden walkway. Since it is a floating dock, you will need to have flexible connections, or swing joints at the top and bottom of your walkway anyhow. That might be enough to accomodate the expansion. How much rise/fall will your dock have relative to the shore platform? I recall awhile back that someone recommended a flex connector (Thom, maybe?) that had been used successfully in such a situation. Note the much, much higher coefficient for PVC. (I could not find CPVC quickly, but expect it to be comparable.) This would explain George's snaky CPVC piping installation for which he did not get all his due. Dave David A. de Vries, P.E., CSP Firetech Engineering Incorporated --- On Wed, 11/10/10, Coastal <[email protected]> wrote: From: Coastal <[email protected]> Subject: Re: Pipe Expansion To: "Fletcher, Ron" <[email protected]> Date: Wednesday, November 10, 2010, 6:41 PM Hello Ron, It is not a building, Wooden walkway to a floating dock. Wednesday, November 10, 2010, 5:16:36 PM, you wrote: > Since the building and the sprinkler system are subject to the same > ambient conditions wouldn't the expansion rates kind of offset each > other? > Ron Fletcher > Aero Automatic > Phoenix, AZ > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Thom > Sent: Wednesday, November 10, 2010 3:04 PM > To: [email protected]; [email protected] > Subject: RE: Pipe Expansion > Also remember that a simple change in direction can provide the same > protection as a full expansion loop. > Subject: Re: Pipe Expansion > The expansion is the expansion no matter what fittings are employed, > well on > unrestrained steel. A fitting does not in itself restrain the pipe. > Either > the pipe moves or the want to move is translated into some internal > force. > The effect of the expansion it dependent on the fittings and the > restraintment. > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.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 > [email protected] > http://fireball.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) -- Best regards, Charles Thurston Coastal Fire Protection Coastal mailto:[email protected] _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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 [email protected] http://fireball.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 [email protected] http://fireball.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)
