Richard, I kind of get the impression you don't think too highly of Super Dope :0)
On Fri, Mar 25, 2011 at 8:45 PM, Richard Solis <[email protected]> wrote: > As a field foreman speaking, blue dope/Super dope is very hard to break loose. > Please note these pipe dopes are expensive. Fab shops only apply dope on the > threads with a fitting. Many older fitters apply dope only on the fitting side > using the Rigid 300. I mean Argo plain white dope. Leave blue dope for > plumbers, > and chill water fitters. NEVER use blue dope on branch lines, as they may have > to be broke loose years later during tenant finish, or add and relocates. Blue > dope, or Superdope is only acceptable for Glycol antifreeze systems. You don't > want your field hands using a 36" Rigid steel pipe wrench to breaks loose a 1" > nipple drop that spins the branch line and makes the heads behind it crooked. > You can apply regular Argo white dope on threads, heads, plugs, and it will > not > leak at 250 psi. I have done jobs with underground static psi at 250, and had > no > leaks with dope only. BLUE DOPE is never acceptable in sprinkler work. Its for > the lazy fitter that wants to hand turn his pipe and "eyeball" the fitting so > his armovers, and drops are crooked. If you can't wrench pipe in tight enough > to > hold 250 psi, get another trade. I've had 0'2" nipples that were tight as > ever, > once I put a 4' armover they were loosy goosy and held 200 psi. > > Dope and tape is good, but I always use dope on the outside of threads over > tape > for close nipples, and unions. I also use dope second for shallow threads as > it > allows for superior makeup into the fitting. I have had shallow threads, and > ran > a fitting over the threads on the Ridgid 300, removed the fitting, then I > installed the pipe with major makeup. I stretched the threads. Its the same > when > you reuse an old 90, you make the 90 in on the Ridgid 300 where there was no > makeup on the machine, then install the armover, or drop nipple on the old > made > up threads, ensuring 2 or 3 threads show, and accurate precision in cutting > the > sprinkler head in so a eschuteon will fit with no problem. > > > > > _______________________________________________ > 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) > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ 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)
