In my neck of the woods we have bear that like to mess with hydro piping as well. SUNcerely, Frank Fowler Crystal Pines Alternative Energy 4408 Pine Cluster Ln. Yankee Hill, CA. 95965 530-532-1972 www.solarenergy-alt.com [EMAIL PROTECTED] ----- Original Message ----- From: "Doug Lux" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, July 17, 2004 7:51 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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