G'day Steve,
Geez, giving up the gaspers while under the pump with projects is big; I did the same thing twenty years ago and managed to stay off them. Stick with it as it will be worth it!
I endorse your comments re the group and if anyone censures Chris for his comments I will be the first to be defending the man. He deserves (and has) legendary status similar to yourself. This sensitive new age crap just does not cut it for me. If someone is going to spank me for these comments; bring it on! Lazy people, newbie's, the homework queries and all the others that ask inappropriate questions, without first doing the research, deserve to be spanked. Just how difficult is it? Part of the process of becoming better at your profession is the act of thinking things through and research is a very important part of this process. I have said enough, I am from the old school.
Hmmmmm, cricket team, a bit like a sine wave that has just dipped into the negative I feel. Perhaps your lot should challenge us, you might get a win? :)
Cheers,
Robin
> Hi Robin
> Yes I have been quiet; managing one project too many while trying to
> quit smoking is sapping most of my energy.
> Plus this forum seems to be keeping itself well occupied by members
> squabbling, so theres really little opportunity for constructive
> contribution at present. Will contribute a little more when members
> decide talking about piping is more interesting than bleating about the
> odd silly question and sharp response.
> Should still be about the South Island in Nov so give me a call when you
> know your itinerary. Think I will be going to be in your neck of the
> woods early(ish) next year so I may return the favour.
> What on earth have you done to your cricket team?
>
> Cheers
>
> Steve
>
>
>
> -----Original Message-----
> From: <a href="/group/PipingDesign/post?postID=I4RZy3Un1Xz-evQUyCbt_7ikfvBrzJfMPW_243SwhSkM4SgIKIKco31SXc2VDRA2VrWkBZq2mAvv2NbIfuNqKh9doDH8eg">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=I4RZy3Un1Xz-evQUyCbt_7ikfvBrzJfMPW_243SwhSkM4SgIKIKco31SXc2VDRA2VrWkBZq2mAvv2NbIfuNqKh9doDH8eg">PipingDesign@yahoogroups.com</a>]
> On Behalf Of Robin Badcock
> Sent: Friday, September 02, 2005 6:42 PM
> To: <a href="/group/PipingDesign/post?postID=I4RZy3Un1Xz-evQUyCbt_7ikfvBrzJfMPW_243SwhSkM4SgIKIKco31SXc2VDRA2VrWkBZq2mAvv2NbIfuNqKh9doDH8eg">PipingDesign@yahoogroups.com</a>
> Subject: Re: [PipingDesign] Potable water Piping
>
>
> Well spoken Steve,
>
> Mean rates have little bearing on hydraulic design other than resource
> planning. Instantaneous piping flow demands will bring you unstuck every
> time if not factored in at the start. This is true of the ever aging
> piping infrastructure we have in our towns and city's as the population
> density increases and sprawl becomes greater. Lots of booster pump
> stations on VFD control going in around the joint as a temporary short
> term band-aid fix to the problem.
>
> I thought you must have exited the group as you have been unusually
> quiet? I am coming to you fair Island in November; any chance of a catch
> up and a beer?
>
> Cheers,
>
> Robin
>
>
> ----- Original Message -----
> From: "Steve McKenzie" <Mechproj@xtra.co.nz>
> To: <PipingDesign@yahoogroups.com>
> Sent: Tuesday, August 30, 2005 8:10 PM
> Subject: RE: [PipingDesign] Potable water Piping
>
>
> > Yeehah its Chris bashing season again.
> >
> > Adding to Chris's comments:
> >
> > True networks are always troublesome things, and expressing demand in
> > daily consumption is always a recipe for misunderstanding.
> >
> > For example, and increase from 45 to 70 TPD sounds like an upgrade at
> > a small plant. The nature of the increase and the existing demand
> > profile must be known in order to predict the effect on the system.
> >
> > For example while the daily demand is 45TPD, the peak hourly demand
> > could easily be four times this if, say showers at knockoff time are a
>
> > major component of the daily demand. If more showers are installed
> > then chances are the peak demand will increase and the hydraulics may
> > suffer accordingly. However if a second shift is added then no more
> > showers need to be added, and the hydraulics will remain the same
> > although the daily demand will be increased. Similarly, if the
> > increase in daily demand is due to another cooling tower, then the
> > effect on the system hydraulics may be negligible is the system was
> > sized for a peak demand well in excess of the average.
> >
> > Another area in networks which can cause difficulty is the concept of
> > residual pressure/head which is the required head at the point of
> > discharge or ownership transfer. Suppose the required residual head is
>
> > 30psi and the network system loss is 10 psi. Then the required
> > pressure at the (single) network supply node is 40psi Then assuming
> > the peak demand increases as the daily, the new required pressure is
> > 10 X 2.6 + 30 = 56psi.
> >
> > With networks it is more important that usual to formulate any
> > question clearly. It is essential to know or agree the peak
> > instantaneous demand in order to size the pumps and pipes. Daily
> > demand is of more interest from an accounting/stockholding
> > perspective.
> >
> >
> > Cheers
> >
> > Steve
> >
> > -----Original Message-----
> > From: <a href="/group/PipingDesign/post?postID=I4RZy3Un1Xz-evQUyCbt_7ikfvBrzJfMPW_243SwhSkM4SgIKIKco31SXc2VDRA2VrWkBZq2mAvv2NbIfuNqKh9doDH8eg">PipingDesign@yahoogroups.com</a>
> > [mailto:PipingDesign@yahoogroups.com]
> > On Behalf Of Christopher Wright
> > Sent: Tuesday, August 30, 2005 4:04 PM
> > To: <a href="/group/PipingDesign/post?postID=I4RZy3Un1Xz-evQUyCbt_7ikfvBrzJfMPW_243SwhSkM4SgIKIKco31SXc2VDRA2VrWkBZq2mAvv2NbIfuNqKh9doDH8eg">PipingDesign@yahoogroups.com</a>
> > Subject: Re: [PipingDesign] Potable water Piping
> >
> >
> > > If a present system is warking on 40 psi and
> > > fulfilling the requirement of 45 ton/day and if the requirement goes
>
> > > to 70 ton per day than what is the critaria of hydraulics of potable
>
> > > water netwark?
> > In general the pressure drop across a network goes as the square of
> > the flow rate. If you jack up the flow rate by a factor of 70/45 = 1.6
>
> > the upstream pressure needed to get all that water through will
> > increase by a factor of 2.6 if you make no mods to the system. The
> > flow velocity (which affects associated response, like water hammer)
> > goes up by the 1.6 factor. You can start checking the system part by
> > part to see what changes you need to make to withstand the new
> > pressure and handle the new velocity. Christopher Wright P.E. |"They
> > couldn't hit an elephant at
> > chrisw@skypoint.com | this distance" (last words of Gen.
> > .......................................| John Sedgwick, Spotsylvania
> > 1864)
> > <a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a>
> >
> >
> >
> >
> > =========================================
> > PipingOffice - Excel Spreadsheets for Piping Calculations
> > http://www.pipingoffice.us/ =========================================
> > Main site: <a href="http://www.pipingdesign.com">http://www.pipingdesign.com</a>
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > =========================================
> > PipingOffice - Excel Spreadsheets for Piping Calculations
> > http://www.pipingoffice.us/ =========================================
> > Main site: <a href="http://www.pipingdesign.com">http://www.pipingdesign.com</a>
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping Calculations
> http://www.pipingoffice.us/ =========================================
> Main site: <a href="http://www.pipingdesign.com">http://www.pipingdesign.com</a>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping Calculations
> <a href="http://www.pipingoffice.us/">http://www.pipingoffice.us/</a>
> =========================================
> Main site: <a href="http://www.pipingdesign.com">http://www.pipingdesign.com</a>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
Received on Fri Sep 02 20:47:00 2005
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