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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Cutting NPT threads on PVC pipe
My swimming pool pump quit, and the new one is just slightly longer, so to
connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. That is, instead of gluing a PVC male adapter, which would add too much length. Swimming pool plumbing has to be all plastic due to the chemistry of the water. Now Home Depot threads steel pipe, with a nice powered pipe threader on the plumbing pipe aisle, but when I asked them to thread some PVC they practically called me a pervert. They said the only way to get threads on a PVC pipe was to glue on a male adapter, and you can't thread PVC pipe. However quite a few bits of the PVC pool plumbing appear to have been threaded on-site. And interestingly, the classic Ridgid 12R pipe threader has replacement dies specifically for PVC: http://ridgid.com/Tools/Hand-Threader-Die-Heads/ So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? Or just not often worth the labor versus a glued fitting? |
#2
Posted to rec.crafts.metalworking
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Cutting NPT threads on PVC pipe
On Fri, 22 Jan 2010 02:45:13 -0600, Richard J Kinch
wrote: My swimming pool pump quit, and the new one is just slightly longer, so to connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. That is, instead of gluing a PVC male adapter, which would add too much length. Swimming pool plumbing has to be all plastic due to the chemistry of the water. Now Home Depot threads steel pipe, with a nice powered pipe threader on the plumbing pipe aisle, but when I asked them to thread some PVC they practically called me a pervert. They said the only way to get threads on a PVC pipe was to glue on a male adapter, and you can't thread PVC pipe. However quite a few bits of the PVC pool plumbing appear to have been threaded on-site. And interestingly, the classic Ridgid 12R pipe threader has replacement dies specifically for PVC: http://ridgid.com/Tools/Hand-Threader-Die-Heads/ So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? Or just not often worth the labor versus a glued fitting? They didnt have already threaded 2" joints/fittings of variou types? They are common as dirt here in California HDs Gunner The current Democratic party has lost its ideological basis for existence. - It is NOT fiscally responsible. - It is NOT ethically honorable. - It has started wars based on lies. - It does not support the well-being of americans - only billionaires. - It has suppresed constitutional guaranteed liberties. - It has foisted a liar as president upon America. - It has violated US national sovereignty in trade treaties. - It has refused to enforce the national borders. ....It no longer has valid reasons to exist. Lorad474 |
#3
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Cutting NPT threads on PVC pipe
So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? Or just not often worth the labor versus a glued fitting? I see McMaster has them in several lengths. http://www.mcmaster.com/#pvc-pipe-nipples/=5hexxy Or fire up your lathe and make yer own. Use honed HSS and like 20 degree rake Karl |
#4
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Cutting NPT threads on PVC pipe
On Jan 22, 5:05*am, Gunner Asch wrote:
On Fri, 22 Jan 2010 02:45:13 -0600, Richard J Kinch ... So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? *Or just not often worth the labor versus a glued fitting? They didnt have already threaded 2" joints/fittings of variou types? They are common as dirt here in California HDs Gunner The threaded ones I've found at HD and Lowes were grey, and not in the same area as white DWV fittings. When I thread plastic pipe for mechanical projects I use electrical conduit. It cuts very well with HSS. jsw |
#5
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Cutting NPT threads on PVC pipe
Richard J Kinch fired this volley in
: So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? Or just not often worth the labor versus a glued fitting? Richard, it is "an obama-nation" because it condemns the pressure rating of the pipe. In your instance, the fittings aren't probably under more than 15-20psi, so it might be acceptable. However, unless there's an ell just downwind of the pump, why not whack off the pipe shorter than necesary, and apply a "repair union" to join the main line to the nipple section. Repair unions use rubber compression grommets to seal around the pipe, and permit the user to slide one or the other end back and forth to shorten or lengthen the section as necessary for fit-ups. This would not only solve your existing problem, but mitigate the difficulties of changing the pump in the future. LLoyd |
#6
Posted to rec.crafts.metalworking
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Cutting NPT threads on PVC pipe
Richard J Kinch wrote: My swimming pool pump quit, and the new one is just slightly longer, so to connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. That is, instead of gluing a PVC male adapter, which would add too much length. Swimming pool plumbing has to be all plastic due to the chemistry of the water. Now Home Depot threads steel pipe, with a nice powered pipe threader on the plumbing pipe aisle, but when I asked them to thread some PVC they practically called me a pervert. They said the only way to get threads on a PVC pipe was to glue on a male adapter, and you can't thread PVC pipe. However quite a few bits of the PVC pool plumbing appear to have been threaded on-site. And interestingly, the classic Ridgid 12R pipe threader has replacement dies specifically for PVC: http://ridgid.com/Tools/Hand-Threader-Die-Heads/ So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? Or just not often worth the labor versus a glued fitting? Schedule 80 PVC is commonly available threaded. Depot and the like carry it in smaller sizes, probably need to go to a "real" plumbing supply place for larger sizes. |
#7
Posted to rec.crafts.metalworking
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Cutting NPT threads on PVC pipe
On Fri, 22 Jan 2010 02:45:13 -0600, Richard J Kinch
wrote: My swimming pool pump quit, and the new one is just slightly longer, so to connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. That is, instead of gluing a PVC male adapter, which would add too much length. Swimming pool plumbing has to be all plastic due to the chemistry of the water. Now Home Depot threads steel pipe, with a nice powered pipe threader on the plumbing pipe aisle, but when I asked them to thread some PVC they practically called me a pervert. They said the only way to get threads on a PVC pipe was to glue on a male adapter, and you can't thread PVC pipe. However quite a few bits of the PVC pool plumbing appear to have been threaded on-site. And interestingly, the classic Ridgid 12R pipe threader has replacement dies specifically for PVC: http://ridgid.com/Tools/Hand-Threader-Die-Heads/ So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? Or just not often worth the labor versus a glued fitting? All the threaded PVC I've seen in process piping was schedule 80. I've never witnessed PVC being threaded on site, but I'm not aware of any reason it can't be as long as the pipe wall is heavy enough. I wonder if the thread form is modified to account for the PVC's physical properties? Threaded PVC joints are more prone to leaks than metal-metal joints and must be made up carefully to avoid leaks. Fittings with metal inserts are available to minimize the problem. -- Ned Simmons |
#8
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Cutting NPT threads on PVC pipe
On Fri, 22 Jan 2010 02:45:13 -0600, Richard J Kinch
wrote: My swimming pool pump quit, and the new one is just slightly longer, so to connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. That is, instead of gluing a PVC male adapter, which would add too much length. Swimming pool plumbing has to be all plastic due to the chemistry of the water. Now Home Depot threads steel pipe, with a nice powered pipe threader on the plumbing pipe aisle, but when I asked them to thread some PVC they practically called me a pervert. They said the only way to get threads on a PVC pipe was to glue on a male adapter, and you can't thread PVC pipe. However quite a few bits of the PVC pool plumbing appear to have been threaded on-site. And interestingly, the classic Ridgid 12R pipe threader has replacement dies specifically for PVC: http://ridgid.com/Tools/Hand-Threader-Die-Heads/ So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? Or just not often worth the labor versus a glued fitting? Like others have said.... You can thread sch80 but not sch40. It can be done with a standard pipe threader, but I would suggest NEW dies. Ones used on steel will most likely chew up the PCV. The dies Ridgid sells for PVC have a differant rake angle on them to cut nicer than the ones for steel. Mcmaster Carr is most likely your best bet if they have the lenght you need. MCM-C is where I go for PVC or Stainless, the plumbing houses around here just look at you strange if you ask for SS or threaded PVC. Heck, I had to McM-C galvanized steel fittings for my air lines as the local plumbing house no longer carries that stuff either. Houses are all plastic now. Soon it will be tough to find copper. Thank You, Randy Remove 333 from email address to reply. |
#9
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Cutting NPT threads on PVC pipe
On Fri, 22 Jan 2010 14:56:03 -0500, Randy wrote:
On Fri, 22 Jan 2010 02:45:13 -0600, Richard J Kinch wrote: My swimming pool pump quit, and the new one is just slightly longer, so to connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. That is, instead of gluing a PVC male adapter, which would add too much length. Swimming pool plumbing has to be all plastic due to the chemistry of the water. Now Home Depot threads steel pipe, with a nice powered pipe threader on the plumbing pipe aisle, but when I asked them to thread some PVC they practically called me a pervert. They said the only way to get threads on a PVC pipe was to glue on a male adapter, and you can't thread PVC pipe. However quite a few bits of the PVC pool plumbing appear to have been threaded on-site. And interestingly, the classic Ridgid 12R pipe threader has replacement dies specifically for PVC: http://ridgid.com/Tools/Hand-Threader-Die-Heads/ So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? Or just not often worth the labor versus a glued fitting? Like others have said.... You can thread sch80 but not sch40. It can be done with a standard pipe threader, but I would suggest NEW dies. Ones used on steel will most likely chew up the PCV. The dies Ridgid sells for PVC have a differant rake angle on them to cut nicer than the ones for steel. Mcmaster Carr is most likely your best bet if they have the lenght you need. MCM-C is where I go for PVC or Stainless, the plumbing houses around here just look at you strange if you ask for SS or threaded PVC. Heck, I had to McM-C galvanized steel fittings for my air lines as the local plumbing house no longer carries that stuff either. Houses are all plastic now. Soon it will be tough to find copper. Thank You, Randy Remove 333 from email address to reply. Rigid actually sells dies for threading PVC. I was made aware of this at the factory (now shut down and for sale) where I keep my Stuff, in So. Cal. They threaded miles of PVC and was made aware of the differences. Odd looking dies when compared to steel pipe dies. Gunner The current Democratic party has lost its ideological basis for existence. - It is NOT fiscally responsible. - It is NOT ethically honorable. - It has started wars based on lies. - It does not support the well-being of americans - only billionaires. - It has suppresed constitutional guaranteed liberties. - It has foisted a liar as president upon America. - It has violated US national sovereignty in trade treaties. - It has refused to enforce the national borders. ....It no longer has valid reasons to exist. Lorad474 |
#10
Posted to rec.crafts.metalworking
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Cutting NPT threads on PVC pipe
In article ,
Richard J Kinch wrote: My swimming pool pump quit, and the new one is just slightly longer, so to connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. That is, instead of gluing a PVC male adapter, which would add too much length. It's PVC plumbing. Rather than think about it like it's steel pipe and make it complicated, think about it like it's PVC pipe, and it gets simple, messy, but simple. If it's too long, you cut it off, chop out the amount needed to shorten it, and glue in a coupling. If you need to "stretch" it (which seems to be your original need before the too-long fitting), you chop it off, cut a section of pipe long enough to stretch it as much as you need, and glue in two couplings - allowing for the center length of the coupling in both cases. If you don't have enough room to put the coupling bodies there, you chop it before the next fitting where there will be room for a coupling and replace with pipe the right length and new fittings. If you only need to add a little bit, you may need to cut some out so the added in piece will be long enough for two couplings, or you buy a new end fitting and only use one coupling. Sch 40 is not normally threaded - your pool installers may have done so, since pool plumbing is often operated at low pressure and threading costs less than adapters, especially when you are plumbing up lots of pools and getting out of town before they break... The HDs and Lowes of the world (at least the ones I've been in) generally don't have any Sch80 on site and may not be able to get any. Even Sch80 is more prone to fail when threaded than when glued. -- Cats, coffee, chocolate...vices to live by |
#11
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Cutting NPT threads on PVC pipe
On Jan 22, 6:17*pm, Ecnerwal
wrote: In article , *Richard J Kinch wrote: My swimming pool pump quit, and the new one is just slightly longer, so to connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. *That is, instead of gluing a PVC male adapter, which would add too much length. It's PVC plumbing. Rather than think about it like it's steel pipe and make it complicated, think about it like it's PVC pipe, and it gets simple, messy, but simple. Pool plumbing has too many expensive custom fittings to think about it as just ordinary PVC plumbing. jsw |
#12
Posted to rec.crafts.metalworking
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Cutting NPT threads on PVC pipe
"Richard J Kinch" wrote in message . .. My swimming pool pump quit, and the new one is just slightly longer, so to connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. That is, instead of gluing a PVC male adapter, which would add too much length. Swimming pool plumbing has to be all plastic due to the chemistry of the water. Now Home Depot threads steel pipe, with a nice powered pipe threader on the plumbing pipe aisle, but when I asked them to thread some PVC they practically called me a pervert. They said the only way to get threads on a PVC pipe was to glue on a male adapter, and you can't thread PVC pipe. However quite a few bits of the PVC pool plumbing appear to have been threaded on-site. And interestingly, the classic Ridgid 12R pipe threader has replacement dies specifically for PVC: http://ridgid.com/Tools/Hand-Threader-Die-Heads/ So is threading PVC pipe an unnatural abomination like the top industry experts at Home Depot, in their orange aprons, assert? Or just not often worth the labor versus a glued fitting? Might have to go on-line, but I have purchased threaded PVC nipples before. The ones I got were in smaller sizes. Don't know if larger sizes are available or not. Remember at Home Depot they always treat you like an idiot if "they" don't know what you are talking about. After all Home Depot goes out and hires the very best of those who couldn't hack it as a tradesman or a contractor. When I run into the rare Home Depot employee who admits they might not know something and asks me for more information I offer them a job if I'm hiring. |
#13
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Cutting NPT threads on PVC pipe
Lloyd E. Sponenburgh writes:
However, unless there's an ell just downwind of the pump, why not whack off the pipe shorter than necesary, and apply a "repair union" to join the main line to the nipple section. Because I had only 4 inches of room to put a 3.5" long union between a tee shoulder and the female coupling on the pump strainer basket. The old system had no union on the suction side of the pump, so you had to disassemble the pump (ugh!) to unscrew the threaded fitting. Two pumps and a filter are all housed in an underground vault (I know, I know, this was madness, but not of my origination). You can see an old photo here, with the strainer basket near the bottom of the photo: http://www.truetex.com/protect/poolctrl3.jpg I'm actually thinking I should have checked Lowe's since they have a selection of Sch 80 PVC bits. But too late, I bought a 2" threader and made my own PVC nipple. It seemed to work out fine. |
#14
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Cutting NPT threads on PVC pipe
Gunner Asch writes:
They didnt have already threaded 2" joints/fittings of variou types? They have female slip (glue) adapters to thread, but not (ale) threaded pipe nipples. An adapter is too long, I must have a nipple to fit the space available. |
#15
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Cutting NPT threads on PVC pipe
On Jan 23, 12:20*am, "Bob La Londe" wrote:
.... I offer them a job if I'm hiring What do you do? jsw |
#16
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Cutting NPT threads on PVC pipe
On Fri, 22 Jan 2010 18:17:33 -0500, Ecnerwal
wrote: In article , Richard J Kinch wrote: My swimming pool pump quit, and the new one is just slightly longer, so to connect it in the space available, I need what in steel pipe you would call a threaded nipple, except in 2-inch PVC pipe. That is, instead of gluing a PVC male adapter, which would add too much length. It's PVC plumbing. Rather than think about it like it's steel pipe and make it complicated, think about it like it's PVC pipe, and it gets simple, messy, but simple. If it's too long, you cut it off, chop out the amount needed to shorten it, and glue in a coupling. If you need to "stretch" it (which seems to be your original need before the too-long fitting), you chop it off, cut a section of pipe long enough to stretch it as much as you need, and glue in two couplings - allowing for the center length of the coupling in both cases. If you don't have enough room to put the coupling bodies there, you chop it before the next fitting where there will be room for a coupling and replace with pipe the right length and new fittings. If you only need to add a little bit, you may need to cut some out so the added in piece will be long enough for two couplings, or you buy a new end fitting and only use one coupling. Sch 40 is not normally threaded - your pool installers may have done so, since pool plumbing is often operated at low pressure and threading costs less than adapters, especially when you are plumbing up lots of pools and getting out of town before they break... The HDs and Lowes of the world (at least the ones I've been in) generally don't have any Sch80 on site and may not be able to get any. Even Sch80 is more prone to fail when threaded than when glued. In the chemical plants I worked in, Sch. 80 was required for all nipples below 3/4" in all metal fittings as well. There were too many instances of d/p cells, etc. breaking off in some nasty service or another. Pete Keillor |
#17
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Cutting NPT threads on PVC pipe
"Jim Wilkins" wrote in message
... On Jan 23, 12:20 am, "Bob La Londe" wrote: .... I offer them a job if I'm hiring What do you do? jsw I'm a communications contractor. Video, phone, data, access, alarm, sound, etc. A lot of related experience including aerial and underground applications. Licensed since 1994. Almost all learned on the job or self study. Education is in CIS and business. |
#18
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Cutting NPT threads on PVC pipe
On Sat, 23 Jan 2010 09:26:04 -0700, "Bob La Londe"
wrote: "Jim Wilkins" wrote in message ... On Jan 23, 12:20 am, "Bob La Londe" wrote: .... I offer them a job if I'm hiring What do you do? jsw I'm a communications contractor. Video, phone, data, access, alarm, sound, etc. A lot of related experience including aerial and underground applications. Licensed since 1994. Almost all learned on the job or self study. Education is in CIS and business. I managed a similar company for 18 yrs. Too bad I didnt know you when they split it up. Gunner The current Democratic party has lost its ideological basis for existence. - It is NOT fiscally responsible. - It is NOT ethically honorable. - It has started wars based on lies. - It does not support the well-being of americans - only billionaires. - It has suppresed constitutional guaranteed liberties. - It has foisted a liar as president upon America. - It has violated US national sovereignty in trade treaties. - It has refused to enforce the national borders. ....It no longer has valid reasons to exist. Lorad474 |
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