Doug: The problem appears when the wild life transverses the piping, We have covered some piping when the wildlife shows interest for the piping.
Regards Nando ----- Original Message ----- From: "Doug Lux" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, July 17, 2004 9:51 AM Subject: Re: [microhydro] Re: penstock material questions > I read with interest of your pvc problems, as I have had a 4" line running > almost 700 feet down the hill for the last 5 years with no problems so far > (knock on wood now that I have said the words) we have lots of deer in the > yard and the usual varmets....hope my luck holds out!! > > doug > ----- Original Message ----- > From: "Lewis" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Friday, July 16, 2004 9:38 PM > Subject: [microhydro] Re: penstock material questions > > > > Hello, > > > > Be very wary of bursting pressure. It is one of those numbers that > > can be manipulated to mean anything. > > C900 comes in working pressure ratings of 100, 150, & 200 psi. These > > are the only numbers you should consider. Now, according to my very > > rough calculations, you should have about 300 psi working pressure at > > the bottom of your run. That pretty much elimates C900 for your > > situation. And, don't forget about surge pressures, which can be 3 > > times your working pressure. > > Also, I have found 2 problems with using pvc, but that doesn't deter > > my using it in some cases. 1) Deer love to poke their hoofs thru it. > > 2) Rodents love to chew holes in it. > > Now, if you can find a work around to those two problems, or you are > > willing to live with occasionally having to replace sections of the > > run, then go ahead and use it. > > > > Just my 2 cents worth, > > > > Lewis Hughes > > Hughes Micro Corp. > > > > > > --- In [EMAIL PROTECTED], "Eric Youngren" <[EMAIL PROTECTED]> wrote: > > > Hi folks, > > > > > > Well I'm finally getting to the point where I'm ready to place my > > orders for pipe and fittings for my high-head penstock. > > > > > > I've been talking with different pipe suppliers and getting a lot of > > different, and contradictory, information about the pros and cons of > > various materials. I thought maybe I'd throw it out there to the list > > to see what y'all suggest. > > > > > > Here's the pipeline details: > > > Gross head : 650 feet > > > Design Flow : 200 gpm (varies from 50 - 350 gpm seasonally) > > > Penstock length : 1500' > > > Site: Very steep and rugged, forested w/ exposed bedrock in many > > places, some loose shale > > > > > > Based on those parameters we're going to use 4" diameter pipe. I > > have been thinking of using 160 psi rated HDPE for the first 500' of > > length because it is relatively easy to install and very durable over > > time. Below the poly I'll need higher pressure rated pipe. My first > > thought is steel, using Victaulic couplers to connect the 21' > > sections. But steel is now close to $5 per foot and I'm not looking > > forward to hauling all of that heavy pipe up and down the mountain all > > summer, and steel will eventually rust. I talked to a supplier this > > morning who highly recommended C900 PVC. It is a bit lighter than > > steel, rated for 985 psi bursting pressure, and half the price of > > steel. He also assured me that it is UV stable, impact resistant and > > will last longer than steel. Another guy I talked to was suggesting > > ductile iron pipe, which I know little about so far. > > > > > > So those seem like my options, steel w/ external couplers, C900 PVC > > or ductile iron. What do you think? I'm no engineer so I'd love to > > hear from anybody who sees any obvious or not-so-obvious advantages to > > one of these materials. > > > > > > Thanks, > > > Eric > > > > > > > > > [Non-text portions of this message have been removed] > > > > > > > > > > > > Does your company feature in the microhydro business directory at > http://microhydropower.net/directory ? If not, please register free of > charge and be exposed to the microhydro community world wide! > > > > NOTE: The advertisements in this email are added by Yahoogroups who > provides us with free email group services. The microhydro-group does not > endorse products or support the advertisements in any way. > > > > More information on micro hydropower at http://microhydropower.net > > > > To unsubscribe: send empty message to > [EMAIL PROTECTED] > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! > > NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. 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