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#1
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Fitting fittings on PVC pipe
I'm using the standard schedule 40 PVC piping to construct railings
for a platform. No water (or any other fluid) will flow through the pipes but I need to disassemble the railings for storage, hence no gluing (but the same question would apply even if there was). Connection will be secured by drilling a hole through the fitting and pipe and putting in a bolt and nut. The problem is that the fittings are an interference (or worse) fit on the pipe and short of cutting about 1/64" off the inside of the fitting or the outside of the pipe end I can't get the pipe to bottom out in the fitting. Up to now I've laboriously used a belt sander to grind back the last inch or so of the pipe (just chamfering the end doesn't help) but there must be a better way! I remember many years earlier having the same problem with 4-inch sewer line (the current pipe is 1 1/4") and there I was running water (and other things) in it. The sewer line didn't leak but I doubt any pipe was bottomed into its fitting. So what's the secret? |
#2
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Fitting fittings on PVC pipe
On Nov 9, 12:42*am, wrote:
I'm using the standard schedule 40 PVC piping to construct railings for a platform. No water (or any other fluid) will flow through the pipes but I need to disassemble the railings for storage, hence no gluing (but the same question would apply even if there was). Connection will be secured by drilling a hole through the fitting and pipe and putting in a bolt and nut. The problem is that the fittings are an interference (or worse) fit on the pipe and short of cutting about 1/64" off the inside of the fitting or the outside of the pipe end I can't get the pipe to bottom out in the fitting. Up to now I've laboriously used a belt sander to grind back the last inch or so of the pipe (just chamfering the end doesn't help) but there must be a better way! I remember many years earlier having the same problem with 4-inch sewer line (the current pipe is 1 1/4") and there I was running water (and other things) in it. The sewer line didn't leak but I doubt any pipe was bottomed into its fitting. So what's the secret? The PVC cement acts as a lubricant, so use some lubrication. Silicone spray would work. R |
#3
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Fitting fittings on PVC pipe
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#6
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Fitting fittings on PVC pipe
In article ,
"RogerT" wrote: Here are some links I found that talk about or show how the female PVC fittings are tapered: http://www.askthebuilder.com/PVC_Fittings_Video.shtml http://expert4pvc.com/Documents/How%...%20Joints2.pdf http://www.spearsmfg.com/prod_dimens...0_0210_web.pdf Which makes sanding the ends of the male pipe the wrong approach. Instead, bore out the female fittings. |
#7
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Fitting fittings on PVC pipe
Smitty Two wrote:
.... Which makes sanding the ends of the male pipe the wrong approach. Instead, bore out the female fittings. Excepting it's a lot simpler to take off the outside edge than to drill out the inside diameter... -- |
#8
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Fitting fittings on PVC pipe
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#9
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Fitting fittings on PVC pipe
On Nov 9, 10:48*am, "RogerT" wrote:
wrote: I'm using the standard schedule 40 PVC piping to construct railings for a platform. No water (or any other fluid) will flow through the pipes but I need to disassemble the railings for storage, hence no gluing (but the same question would apply even if there was). Connection will be secured by drilling a hole through the fitting and pipe and putting in a bolt and nut. The problem is that the fittings are an interference (or worse) fit on the pipe and short of cutting about 1/64" off the inside of the fitting or the outside of the pipe end I can't get the pipe to bottom out in the fitting. Up to now I've laboriously used a belt sander to grind back the last inch or so of the pipe (just chamfering the end doesn't help) but there must be a better way! I remember many years earlier having the same problem with 4-inch sewer line (the current pipe is 1 1/4") and there I was running water (and other things) in it. The sewer line didn't leak but I doubt any pipe was bottomed into its fitting. So what's the secret? The secret is that the PVC fittings are slightly tapered, which causes them to only go part way in when dry-fitting them. *When gluing the fittings together, the glue acts as a solvent and enables the fittings to then go together and completely bottom out. *But, you don't want to glue them since you need to be able to disassemble them for storage. Using any type of lubricant, such as soapy water or silicone that has already been suggested will not work. I am not sure I follow you. In your situation you were going to be gluing the PVC as it was a drainage system and had to be water tight, yet you were willing to contaminate the joint with silicone and other extraneous stuff? Just so you could mark the joint? I'm afraid I just don't understand what the issue was. I've had assemblies that would have given Rube Goldberg a headache, and I've always done them the same way. Assemble a few pieces of pipe and fittings into sections to get a close-enough fit, glue the pieces into sections, then glue and assemble the assorted sections. You're just trying to limit the degrees of freedom. Once you get down to the last couple of joints, they can be measured. And you can always use slip couplings or Fernco (or approved equal) banded couplings. The OP's situation is different as he'll be using bolts and there is no critical reason to have the joint fully bottomed out (it's rarely critical in plumbing as there will always be a discontinuity anyway). The silicone spray won't disappear in a tightly fitting joint, and the silicone will provide enough wiggle room to allow the railing to be disassembled. I'm not sure what size PVC the OP's planning on using for the railing, how high the platform is, or how wise it is to use PVC for a railing. It may very well be that PVC is a poor choice for the railing in the first place. R |
#10
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Fitting fittings on PVC pipe
dpb wrote:
wrote: I'm using the standard schedule 40 PVC piping to construct railings for a platform. ... pipe is 1 1/4") ... Don't know the application of the railing/platform or distance between supports nor what supports are, but Sch 40 1-1/4" isn't terribly strong and not much suited to the purpose it would seem... First let me thank the posters for their responses. I agree that reducing the internal diameter of the fitting would be more appropriate but that would require something like a small version of the hone used to remove the lip on the top of the cylinder in an automotive engine. Mucho dinero I would think. Alternatively putting a taper on the pipe using a lathe would also work. OTOH I'd have to buy the lathe first g. I guess I'm going to continue to use the belt sander. For everything up to about 2 inch I've never had a gluing problem but as I pointed out in my original post 4-inch is problematic. Maybe all plumbers are built like a young Arnold Swartzenegger? As to the use of the railings, I didn't really ask your opinion on their suitability for their intended purpose nor am I willing to countenance any nannyistic commentary. Keep to the subject! |
#11
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Fitting fittings on PVC pipe
In article ,
dpb wrote: Smitty Two wrote: ... Which makes sanding the ends of the male pipe the wrong approach. Instead, bore out the female fittings. Excepting it's a lot simpler to take off the outside edge than to drill out the inside diameter... -- Depends on how you feel about precision, and what tools you have available. I can bore out a straight, neat, accurate hole with far less trouble than I can accurately taper the OD of a pipe. |
#12
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Fitting fittings on PVC pipe
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#13
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Fitting fittings on PVC pipe
On Nov 9, 10:24*pm, wrote:
dpb wrote: wrote: I'm using the standard schedule 40 PVC piping to construct railings for a platform. ... pipe is 1 1/4") ... Don't know the application of the railing/platform or distance between supports nor what supports are, but Sch 40 1-1/4" isn't terribly strong and not much suited to the purpose it would seem... As to the use of the railings, I didn't really ask your opinion on their suitability for their intended purpose nor am I willing to countenance any nannyistic commentary. Keep to the subject! It doesn't work that way, Sparky. It's an open forum - if you're doing something stupid, or if people have questions to determine if you're trying to do something stupid, they'll point out it's stupid or ask if you are trying to do something stupid. Learn to deal with it. Do anything else would be stupid. R |
#14
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Fitting fittings on PVC pipe
On Nov 8, 11:42*pm, wrote:
I'm using the standard schedule 40 PVC piping to construct railings for a platform. snip Poor choice if outdoors. PVC is not formulated for UV exposure, The exception is electrical (gray) conduit which will be labeled as UV resistant. A more practical and durable railing system can be constructed with special fittings and tubing from industrial supply houses, McMaster, Grainger, etc. Galvanized is suitable for outdoor use. If you absolutely must use PVC, the fittings can be mated to each other by rotating one part inside the other with a coating of valve lapping compound. The Clover brand compound is available at auto supply stores, industrial outlets as above and comes in a dozen or so grades from coarse to fine. I've done this and it is not very fast, but it is more precise than sanding. Joe |
#16
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Fitting fittings on PVC pipe
On Nov 10, 7:12*am, Jim Elbrecht wrote:
wrote: -snip- As to the use of the railings, I didn't really ask your opinion on their suitability for their intended purpose nor am I willing to countenance any nannyistic commentary. Keep to the subject! In other words-- "I didn't come here for a conversation. * *I came to have my hand held with some advice, that, if I choose to follow it, can be blamed for the failure of the project." ESAD Jim Galvinized electrical conduit would be another choice. I agree with the other posters about the use of pvc, it's not really very strong nor is it uv resistant. Combine that with all the extra work to deal with the tapered fittings. |
#17
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Fitting fittings on PVC pipe
On Nov 9, 4:49*pm, RicodJour wrote:
On Nov 9, 10:48*am, "RogerT" wrote: wrote: I'm using the standard schedule 40 PVC piping to construct railings for a platform. No water (or any other fluid) will flow through the pipes but I need to disassemble the railings for storage, hence no gluing (but the same question would apply even if there was). Connection will be secured by drilling a hole through the fitting and pipe and putting in a bolt and nut. The problem is that the fittings are an interference (or worse) fit on the pipe and short of cutting about 1/64" off the inside of the fitting or the outside of the pipe end I can't get the pipe to bottom out in the fitting. Up to now I've laboriously used a belt sander to grind back the last inch or so of the pipe (just chamfering the end doesn't help) but there must be a better way! I remember many years earlier having the same problem with 4-inch sewer line (the current pipe is 1 1/4") and there I was running water (and other things) in it. The sewer line didn't leak but I doubt any pipe was bottomed into its fitting. So what's the secret? The secret is that the PVC fittings are slightly tapered, which causes them to only go part way in when dry-fitting them. *When gluing the fittings together, the glue acts as a solvent and enables the fittings to then go together and completely bottom out. *But, you don't want to glue them since you need to be able to disassemble them for storage. Using any type of lubricant, such as soapy water or silicone that has already been suggested will not work. I am not sure I follow you. *In your situation you were going to be gluing the PVC as it was a drainage system and had to be water tight, yet you were willing to contaminate the joint with silicone and other extraneous stuff? *Just so you could mark the joint? *I'm afraid I just don't understand what the issue was. *I've had assemblies that would have given Rube Goldberg a headache, and I've always done them the same way. *Assemble a few pieces of pipe and fittings into sections to get a close-enough fit, glue the pieces into sections, then glue and assemble the assorted sections. *You're just trying to limit the degrees of freedom. *Once you get down to the last couple of joints, they can be measured. *And you can always use slip couplings or Fernco (or approved equal) banded couplings. The OP's situation is different as he'll be using bolts and there is no critical reason to have the joint fully bottomed out (it's rarely critical in plumbing as there will always be a discontinuity anyway). The silicone spray won't disappear in a tightly fitting joint, and the silicone will provide enough wiggle room to allow the railing to be disassembled. I'm not sure what size PVC the OP's planning on using for the railing, how high the platform is, or how wise it is to use PVC for a railing. It may very well be that PVC is a poor choice for the railing in the first place. R- Hide quoted text - - Show quoted text - I understand his issue. I just went through the exact same thing a few months ago. In probably 95% of cases, you can do as you suggested, which is to glue up sections and in such a sequence that you have enough freedom to measure and then fit the last couple of connections. Especially true with new work. But there are close quarters work, where you have to mate up to existing work and you just don't have enough freedom and unless you get several angles/lengths right at the same time, it isn't going to work. It's for those situations that you need to dry fit ahead of time. By dry fitting, you can get the cut lengths exact and also mark the angles between pipe and various elbows, etc, so that when gluing it goes together just right. And I agree with those that say lubricants don't work. I tried soapy water and it had no effect. I didn't realize at the time that the sockets are actually tapered, but it makes sense. The primer/glue dissolves it a bit so it then goes together. |
#18
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Fitting fittings on PVC pipe
On Nov 10, 8:03*am, jamesgangnc wrote:
On Nov 10, 7:12*am, Jim Elbrecht wrote: wrote: -snip- As to the use of the railings, I didn't really ask your opinion on their suitability for their intended purpose nor am I willing to countenance any nannyistic commentary. Keep to the subject! In other words-- "I didn't come here for a conversation. * *I came to have my hand held with some advice, that, if I choose to follow it, can be blamed for the failure of the project." ESAD Jim Galvinized electrical conduit would be another choice. *I agree with the other posters about the use of pvc, it's not really very strong nor is it uv resistant. *Combine that with all the extra work to deal with the tapered fittings. I had that thought about using it for railings as well. I can picture PVC just shattering from a hard sideways blow when you need it most. |
#19
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Fitting fittings on PVC pipe
RicodJour wrote:
I am not sure I follow you. In your situation you were going to be gluing the PVC as it was a drainage system and had to be water tight, yet you were willing to contaminate the joint with silicone and other extraneous stuff? Just so you could mark the joint? I'm afraid I just don't understand what the issue was. Hard to explain, but it was a series of 3 or 4 Street 22-1/2' that had to go up through and around a joist and floor in a tight space in a corner to get to the next floor to create the toilet flange. The problem was how to get them all alligned so that the top and bottom were at the right place to meet the sewer stack below and the toilet above and so that both ends were hoorizontal/level on the top and bottom. |
#20
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Fitting fittings on PVC pipe
On Tue, 9 Nov 2010 20:27:38 -0800 (PST), RicodJour
wrote: It doesn't work that way, Sparky. It's an open forum Seems like someone missed the smiley due to the fact that it was created multisyllabically instead of with ACSII art. Edward |
#21
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Fitting fittings on PVC pipe
RicodJour wrote:
On Nov 9, 10:24*pm, wrote: dpb wrote: wrote: I'm using the standard schedule 40 PVC piping to construct railings for a platform. ... pipe is 1 1/4") ... Don't know the application of the railing/platform or distance between supports nor what supports are, but Sch 40 1-1/4" isn't terribly strong and not much suited to the purpose it would seem... As to the use of the railings, I didn't really ask your opinion on their suitability for their intended purpose nor am I willing to countenance any nannyistic commentary. Keep to the subject! It doesn't work that way, Sparky. It's an open forum - if you're doing something stupid, or if people have questions to determine if you're trying to do something stupid, they'll point out it's stupid or ask if you are trying to do something stupid. Learn to deal with it. Do anything else would be stupid. Sorry, it does work that way because I am in total control of the amount of information I feed you. I repeat: If I wanted commentary on the use of the pipes I would have asked for it. |
#22
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Fitting fittings on PVC pipe
Jim Elbrecht wrote:
wrote: -snip- As to the use of the railings, I didn't really ask your opinion on their suitability for their intended purpose nor am I willing to countenance any nannyistic commentary. Keep to the subject! In other words-- "I didn't come here for a conversation. That's correct. I came to have my hand held with some advice, that, if I choose to follow it, can be blamed for the failure of the project." No hand holding requested, just simple straight advice on a limited question. If you don't choose to do that, you're free to not reply. |
#23
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Fitting fittings on PVC pipe
jamesgangnc wrote:
On Nov 10, 7:12*am, Jim Elbrecht wrote: wrote: -snip- As to the use of the railings, I didn't really ask your opinion on their suitability for their intended purpose nor am I willing to countenance any nannyistic commentary. Keep to the subject! In other words-- "I didn't come here for a conversation. * *I came to have my hand held with some advice, that, if I choose to follow it, can be blamed for the failure of the project." ESAD Jim Galvinized electrical conduit would be another choice. I agree with the other posters about the use of pvc, it's not really very strong nor is it uv resistant. Combine that with all the extra work to deal with the tapered fittings. The use is totally inside. It doesn't need to be too strong but it does need to be cheap. Galvanized conduit in any reasonable size would be way too costly, besides I'd have to have the unpleasant experience of talking to an electrical supply house. Same goes for untapered electrical PVC conduit fittings. If I wanted to do anything nearly so elaborate I'd use chain link fencing. It just occurred to me that the answer is a tool like an oversize pencil sharpener with the appropriate taper. Perhaps even a chuckable pin on the inside so you could put it into an electric drill. Hmmm! After all PVC piping is used in lots of applications other than carrying fluids so easier assembly and disassembly would be valuable. OTOH not many people know about the taper ... |
#24
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Fitting fittings on PVC pipe
On Nov 10, 9:23*pm, wrote:
RicodJour wrote: On Nov 9, 10:24*pm, wrote: dpb wrote: wrote: I'm using the standard schedule 40 PVC piping to construct railings for a platform. ... pipe is 1 1/4") ... Don't know the application of the railing/platform or distance between supports nor what supports are, but Sch 40 1-1/4" isn't terribly strong and not much suited to the purpose it would seem... As to the use of the railings, I didn't really ask your opinion on their suitability for their intended purpose nor am I willing to countenance any nannyistic commentary. Keep to the subject! It doesn't work that way, Sparky. *It's an open forum - if you're doing something stupid, or if people have questions to determine if you're trying to do something stupid, they'll point out it's stupid or ask if you are trying to do something stupid. *Learn to deal with it. Do anything else would be stupid. Sorry, it does work that way because I am in total control of the amount of information I feed you. I repeat: If I wanted commentary on the use of the pipes I would have asked for it. You missed the point, Cupcake. It's not about what you do, it's about you telling us what to do. In general the objective is to prevent people from doing stupid things, but sometimes, well, people insist on being stupid. Good luck with your project. R |
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