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From: Copacetic on 17 Apr 2010 10:36 On Fri, 16 Apr 2010 21:42:37 -0700 (PDT), mpm <mpmillard(a)aol.com> wrote: >On Apr 16, 10:43�pm, Copacetic <Copace...(a)iseverythingalright.org> >wrote: >> On Thu, 15 Apr 2010 19:26:01 -0700, Charlie E. <edmond...(a)ieee.org> >> wrote: >> >> >It is a pressure thing. �There is a constriction in the cold line, and >> >it has lower pressure than the hot line. �You have to really crank the >> >cold, and really diminish the hot to get the pressures equalized. >> >> � No. Both pipes have the same pressure. �Hot water gets used less from a >> FLOW standpoint because less is needed to arrive at the desired operating >> temperature. >> >> � All the pipes in your house all have the same pressure behind them. >> >> � Pressures in a given pipe can be reduced, but only by way of FLOW >> elsewhere in the system. > >Just to clarify for anyone who might help, here.... >I can be the only one home - with no other water being used (not even >the icemaker), and this problem can still occur. >It does not happen all the time, but when it does (or doesn't), it >does not appear to be related to any water use elsewhere in the house. >Mine is a single-story home on a private lot. City water & sewer. >(Not an apartment or multi-family anything.) Interesting.
From: Baron on 17 Apr 2010 11:32 mpm Inscribed thus: > On Apr 16, 10:43 pm, Copacetic <Copace...(a)iseverythingalright.org> > wrote: >> On Thu, 15 Apr 2010 19:26:01 -0700, Charlie E. <edmond...(a)ieee.org> >> wrote: >> >> >It is a pressure thing. There is a constriction in the cold line, >> >and it has lower pressure than the hot line. You have to really >> >crank the cold, and really diminish the hot to get the pressures >> >equalized. >> >> No. Both pipes have the same pressure. Hot water gets used less from >> a FLOW standpoint because less is needed to arrive at the desired >> operating temperature. >> >> All the pipes in your house all have the same pressure behind them. >> >> Pressures in a given pipe can be reduced, but only by way of FLOW >> elsewhere in the system. > > Just to clarify for anyone who might help, here.... > I can be the only one home - with no other water being used (not even > the icemaker), and this problem can still occur. > It does not happen all the time, but when it does (or doesn't), it > does not appear to be related to any water use elsewhere in the house. > Mine is a single-story home on a private lot. City water & sewer. > (Not an apartment or multi-family anything.) Its not unknown for debris to build up in the pipe and lodge in a bend to cause varying water pressure and flow. Someone also mentioned that the water pressure would be the same for both hot and cold supplies. This is not always true. One supply could be from a header tank and the other from the main supply. So they would have different pressures. Also the flow rate would depend upon the size of the smallest pipe in that supply. -- Best Regards: Baron.
From: Charlie E. on 17 Apr 2010 11:33 On Fri, 16 Apr 2010 20:43:46 -0700, Copacetic <Copacetic(a)iseverythingalright.org> wrote: >On Thu, 15 Apr 2010 19:26:01 -0700, Charlie E. <edmondson(a)ieee.org> >wrote: > >>It is a pressure thing. There is a constriction in the cold line, and >>it has lower pressure than the hot line. You have to really crank the >>cold, and really diminish the hot to get the pressures equalized. > > > No. Both pipes have the same pressure. Hot water gets used less from a >FLOW standpoint because less is needed to arrive at the desired operating >temperature. > > All the pipes in your house all have the same pressure behind them. > > Pressures in a given pipe can be reduced, but only by way of FLOW >elsewhere in the system. I see you don't know plumbing. It is like most practical endevours, laden with Murphy attributes that baffle even the experts. He does have flow. He is running his shower! If there are constrictions/blockages in the cold water line that are not in the hot line, then he can get problems like that. He starts hot water, it takes all the pressure off the cold line, so it won't flow. If he starts with the cold, it gets its pressure at first, and so keeps the hot at bay. He probably also has a low flow showerhead, which has a constriction built in that creates back-pressure which is blocking the cold from entering the mixing chamber. Been there, done that! Charlie
From: Baron on 17 Apr 2010 11:44 Copacetic Inscribed thus: > On Thu, 15 Apr 2010 19:26:01 -0700, Charlie E. <edmondson(a)ieee.org> > wrote: > >>Two possibilities. First, the hot and cold line for the shower may be >>adjacent, so the cold line is slowly heated to the same temp as the >>hot line. then, when you run the hot line, it gets a little cooler as >>the tank goes down, but the cold is still the same temp. >> >>OR > > > That is silly. To heat the cold water pipe's water, said water > would > have to be stationary. > > Otherwise, the water temp flowing in the pipe RULES against any > peripheral heating. > > A completely silly suggestion. I disagree. The transfer of heat would take place even if the water were moving in either or both pipes. > So, IF the hot water is the ONLY water on for a LONG enough time to > heat a siamesed pipe's water (A VERY LONG TIME), THEN said water would > be warm or hot, but that would end IMMEDIATELY, once the water in that > pipe is turned on. If the hot water is not ran constant, it too will > cool to ambient temps. Its quite common to lag together both hot and cold pipes for a common run. The idea is that the hot water flow prevents the cold water freezing in its pipe and causing a burst. Admittedly a much less common occurrence nowadays with the use of plastic pipes. > A totally false claim you have made there. -- Best Regards: Baron.
From: krw on 17 Apr 2010 12:13
On Sat, 17 Apr 2010 16:44:54 +0100, Baron <baron.nospam(a)linuxmaniac.nospam.net> wrote: >Copacetic Inscribed thus: > >> On Thu, 15 Apr 2010 19:26:01 -0700, Charlie E. <edmondson(a)ieee.org> >> wrote: >> >>>Two possibilities. First, the hot and cold line for the shower may be >>>adjacent, so the cold line is slowly heated to the same temp as the >>>hot line. then, when you run the hot line, it gets a little cooler as >>>the tank goes down, but the cold is still the same temp. >>> >>>OR >> >> >> That is silly. To heat the cold water pipe's water, said water >> would >> have to be stationary. >> >> Otherwise, the water temp flowing in the pipe RULES against any >> peripheral heating. >> >> A completely silly suggestion. > >I disagree. The transfer of heat would take place even if the water >were moving in either or both pipes. > >> So, IF the hot water is the ONLY water on for a LONG enough time to >> heat a siamesed pipe's water (A VERY LONG TIME), THEN said water would >> be warm or hot, but that would end IMMEDIATELY, once the water in that >> pipe is turned on. If the hot water is not ran constant, it too will >> cool to ambient temps. > >Its quite common to lag together both hot and cold pipes for a common >run. The idea is that the hot water flow prevents the cold water >freezing in its pipe and causing a burst. I have *never* seen anyone do such a stupid thing, even in Vermont where it does get cold (and there is an overabundance of stupid people - Demonicrats). >Admittedly a much less common occurrence nowadays with the use of >plastic pipes. > >> A totally false claim you have made there. |