How big is the device being connected to the wires on the inside of the pipe?

It's a very small coil, measuring about 8mm of x 18mm long

 

It's a very small coil, measuring about 8mm of x 18mm long

OK, then I am going to make a suggestion. I think you should pot your coil and wires in a small piece of 1" PVC pipe, then drill a 1" hole in the short connector pipe, then use PVC cement to glue the device in the hole. You could make it very low profile, and you can ensure the mechanical integrity since you can work on it in the open. You only have to make it as long as necessary to hold the components.

Alternatively, you could use a standard T fitting and shorten the leg where you do the same thing, avoiding the glued connection.

In either case, you can use a disk for mechanical support at the bottom, with the wires penetrating that. It will protect the potting compound from contact with water as well.

 

Get yourself some K&S brass tubing, cut it to size, drill the proper size holes in the PVC, epoxy the tubing into the pipe, insert the wires, after removing the enameling at the proper spot, solder the ends closed, finish with some good shrink tubing.

Combine that with using a tee, a short length of smaller pipe and an end cap, for even better results, and the ability to cut and shorten the smaller pipe if anything goes wrong and you need to replace the coil, or just remove it...etc.

 

Get yourself some K&S brass tubing, cut it to size, drill the proper size holes in the PVC, epoxy the tubing into the pipe, insert the wires, after removing the enameling at the proper spot, solder the ends closed, finish with some good shrink tubing.

Combine that with using a tee, a short length of smaller pipe and an end cap, for even better results, and the ability to cut and shorten the smaller pipe if anything goes wrong and you need to replace the coil, or just remove it...etc.

(non-serious comment deleted by me) It seemed funny at the time.

 

That is a whole lot of effort and expense just to mount a detonator inside a pipe. I just figured out what it is. An old style flashbulb with the plastic coating peeled off so that it will burst and spit fire when it flashes. That ignites the black powder around it, which in turn detonates the several pounds of the high explosive. Sorry it took me so long to figure out what it is all about.

What the... I don't know if you're talking about me, or someone else. But this application has nothing to do with explosives or anything even remotely related. This is about a device to be used in domestic water supplies. So there's only water in the inside, and air on the outside. Nothing else.

 

What the... I don't know if you're talking about me, or someone else. But this application has nothing to do with explosives or anything even remotely related. This is about a device to be used in domestic water supplies. So there's only water in the inside, and air on the outside. Nothing else.

OK. but the same hardware could be used for less friendly purposes.

 

OK. but the same hardware could be used for less friendly purposes.

And I guess that if I were to ask for a timer circuit in a different thread it would be suspicious too?

Anyway, I'm going to try the suggestions that have so generously been posted, and that comply with my requirement of being low profile. This is for testing purposes only, and if all works out I plan to mold the thingy within the pipe, so no seals will be needed in the end. But first I need to make sure that everything works the way I expect it to.

 

OK. but the same hardware could be used for less friendly purposes.

It's quite a stretch applying that kind of paranoid thinking to this thread. If one were building some sort of bomb and needed to insert a wire in a pipe, just about any sealant would do. You don't need to handle pressure variations, etc. and worry about all the nuances discussed in this thread if you just want to fill a tube with something and later destroy it. Also, PVC seems like an unlikely choice for that too!

I mean really, are you going to resist any discussion of anything including a pipe? Should we also prohibit any discussion of heat dissipation in resistors, transistors, etc. which might overheat if overdriven or not heat sinked? As @cmartinez already suggested, are all timers prohibited? What about iot projects? Anything with an internet connection could be misused...

Obviously there's some risk that knowledge of electronics can be used for evil, but I don't think that means we stop teaching or discussing electronics.

 

It's quite a stretch applying that kind of paranoid thinking to this thread. If one were building some sort of bomb and needed to insert a wire in a pipe, just about any sealant would do. You don't need to handle pressure variations, etc. and worry about all the nuances discussed in this thread if you just want to fill a tube with something and later destroy it. Also, PVC seems like an unlikely choice for that too!

I mean really, are you going to resist any discussion of anything including a pipe? Should we also prohibit any discussion of heat dissipation in resistors, transistors, etc. which might overheat if overdriven or not heat sinked? As @cmartinez already suggested, are all timers prohibited? What about iot projects? Anything with an internet connection could be misused...

Obviously there's some risk that knowledge of electronics can be used for evil, but I don't think that means we stop teaching or discussing electronics.

Thank you, ebeowulf17... as you've just said, it's extremely easy to twist anyone's ideas into something unpalatable. I did not elaborate further into my previous post so as not to distract the purpose of this thread. Thanks again for your support, it's thoroughly appreciated.

 

This is for testing purposes only, and if all works out I plan to mold the thingy within the pipe, so no seals will be needed in the end. But first I need to make sure that everything works the way I expect it to.

So your going to replace the "cow magnets" that people tape to their water pipes with an electromagnet?

 

After that nonsense here's another idea for you. You have PVC pipe, why not use a larger gauge wire going through the pipe wall? Most, or at least a lot of wire like car wiring have a PVC jacket/insulation. By drilling two holes, on for each wire, through the pipe wall and a slight slip fit for the wires you could then use the same pipe glue used on the PVC joint to seal the wire. The mystery device would be soldered to the stripped end of the wire going through the pipe wall.

 

So your going to replace the "cow magnets" that people tape to their water pipes with an electromagnet?

You made me Google that one up...
The detailed and elaborate answer to your question is: No ...

After that nonsense here's another idea for you. You have PVC pipe, why not use a larger gauge wire going through the pipe wall? Most, or at least a lot of wire like car wiring have a PVC jacket/insulation. By drilling two holes, on for each wire, through the pipe wall and a slight slip fit for the wires you could then use the same pipe glue used on the PVC joint to seal the wire. The mystery device would be soldered to the stripped end of the wire going through the pipe wall.

Thanks for the suggestion, but I want the wire to run in and out of the pipe in a single piece, no joints.

But I think I've finally figured out how to accomplish what I want. I'll be doing some testing in the following days, and then get back with the results. Promise.

Many thanks!

 

By drilling two holes, on for each wire, through the pipe wall and a slight slip fit for the wires you could then use the same pipe glue used on the PVC joint to seal the wire.

I like this solution best of all so far, because the holes can be very small, the same shape as the wire (round), and make for a good sealing scenario of PVC to PVC. It requires 2 holes instead of one but I think the odds of making a good seal at each hole are at least doubled. Maybe it doesn't suit this application but this is how I'd pass two wires into a PVC pipe.

 

I need to run a couple of 32 ga (0.009" diam) magnet wires through a 1-1/4" schedule 40 PVC pipe (wall thickness about 3.56mm, or a little more than 1/8"). Any ideas as to what is the best way to do it? Should I use a single hole for both wires and then seal it? What kind of sealing technique should I use? Or should I use a couple of screws/rivets acting as pass-through electrodes through the wall and use sealant on them? I would really like to make it work with the wires through a hole only, though.

The pipe is for domestic water use. Indoors conditions. Average pressure would be 35-40 psi, maximum 60 psi. Never as far up as 90 psi.

Water is one of the most corrosive molecules there is. lacquer on magnet wires is NOT able to withstand the corrosion and will be nothing but a headache after a short period of time. Is there a reason you're going through a water-pipe instead of other means?

 

Water is one of the most corrosive molecules there is. lacquer on magnet wires is NOT able to withstand the corrosion and will be nothing but a headache after a short period of time. Is there a reason you're going through a water-pipe instead of other means?

Thanks for the advice, Boba. The end product will have no wires exposed to the water. What I'm doing right now is for testing purposes. If all goes as planned, all internal wiring will be encapsulated in PVC as the part is produced through injection molding.

It'll be interesting to see how long the wires exposed to water will last, though. I promise to get back here with results and observations when this phase is completed. It's the least I can do for all the people that've helped me so far.

 

If all goes as planned, all internal wiring will be encapsulated in PVC as the part is produced through injection molding.

Just be aware of the heat and pressure involved with that process. Make sure the secret can withstand it.

 

It's quite a stretch applying that kind of paranoid thinking to this thread. If one were building some sort of bomb and needed to insert a wire in a pipe, just about any sealant would do. You don't need to handle pressure variations, etc. and worry about all the nuances discussed in this thread if you just want to fill a tube with something and later destroy it. Also, PVC seems like an unlikely choice for that too!

I mean really, are you going to resist any discussion of anything including a pipe? Should we also prohibit any discussion of heat dissipation in resistors, transistors, etc. which might overheat if overdriven or not heat sinked? As @cmartinez already suggested, are all timers prohibited? What about iot projects? Anything with an internet connection could be misused...

Obviously there's some risk that knowledge of electronics can be used for evil, but I don't think that means we stop teaching or discussing electronics.

I never suggested stopping any discussion for that sort of reason. Probably I have come across more "bad actors" than others and that has affected my way of seeing things at some times. I have seen how bad some people can be at times. Those who have not seen are very fortunate indeed, and I hope that they never see such.
This forum site is certainly a great venue for sharing the knowledge and insight that I have accumulated, but there have been questions that did not smell right and which I therefore did not address at all. Not many, but a few. And you may notice that I am not critical of those who post, only sometimes, of some products or politicians.

 

I never suggested stopping any discussion for that sort of reason. Probably I have come across more "bad actors" than others and that has affected my way of seeing things at some times. I have seen how bad some people can be at times. Those who have not seen are very fortunate indeed, and I hope that they never see such.
This forum site is certainly a great venue for sharing the knowledge and insight that I have accumulated, but there have been questions that did not smell right and which I therefore did not address at all. Not many, but a few. And you may notice that I am not critical of those who post, only sometimes, of some products or politicians.

I can certainly understand where you're coming from. Sorry you've had the experiences you've had. I've certainly had bad experiences shake my trust in people, but they were very small time compared to any of this. Anyway, I don't blame you for playing it safe, but I'm also pretty confident in this thread and in @cmartinez .

 

I can certainly understand where you're coming from. Sorry you've had the experiences you've had. I've certainly had bad experiences shake my trust in people, but they were very small time compared to any of this. Anyway, I don't blame you for playing it safe, but I'm also pretty confident in this thread and in @cmartinez .

Thanks. As you might've already noticed, I've been a member of this place for quite a while now, and I never fool around with things as serious as the one that was brought up. It is true that one never knows who's on the other side of the screen when having this sort of exchange, but given the opportunity, people never fail to betray their true character. It's just a matter of time. In my case, there's a rather extensive record of everything I've posted in this place that should speak for itself.

Thanks again for your vote of confidence.

 

I think @cmartinez is working on an IoT cryptocurrency AI drone with blockchain kickstarter.