Threading pipes

[borobam182]

Hi everybody,

Apologies if this topic has been discussed time and time again – I’ve had a good search but can’t find anything, maybe using the wrong ‘buzz words’.

Anyway, my question is of a pipe threading nature. Small bore pipe and pipe threading is not a strength of mine so I’m having some difficulty rationalising this…..

If I’ve got 2 off plain end pipes, each being 1”, and I applied a male thread to one end of one pipe and a female thread to one end of the other, if the wall thicknesses of each was big enough (sch80 for example), could this be done?? Or would you need the pipe that you’re applying the female thread to to be the next size up – 1.25” for example to allow the male pipe to be inserted without having to remove too much material.

Any help would be appreciated.

Thanks

 

[btrueblood]

Pipes take male pipe threads only. You have to have a pipe coupler or other fitting to take the female threads.

 

[bimr]

The female pipe threads are made on fittings which have a larger diameter than pipe. The male fittings are made on the pipe itself.

 

[LittleInch]

In theory if your female end was a really thin wall ( I think sch 40 is the thinnest you can use) and your male end a really thick wall pipe you could machine off some of the male end pipe down to schd 40 thickness and then cut a thread in it.

However most people would simply use a threaded connector.


e.g

https://www.ontariobeerkegs.com/Sta..._Female_NPT_x_1_p/ss-banded-coupler-1inch.htm

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[pennpiper]

borobam182,
To join two length of male threaded pipe (long or short) you must use a female thread Pipe Coupling.
It is not recommended that you play around with other oddball methods such as you noted in your post. There are normally Codes that forbid such things.




Sometimes its possible to do all the right things and still get bad results

 

[racookpe1978]

Now, after you thread the two male pipe into the (female) pipe connector, your final ends of the complete assembly WILL BE (some unknown distance) shorter than the three separately. Depending on how soon each thread engages and the torque needed to twist them together, the final length will vary between every assembly of a group of "identical" assemblies. Your design must recognize this and use some way to ensure all assemblies can either be adjusted, or the pipe assembly fits between two things that can be adjusted.

Also, the final assembly (if a flange) will be rotated to some angle (not two-bolted flat). Many people use a coupler instead to join threaded sections so both ends can rotate to fit flanges or other pipes at different angles.

 

[borobam182]

Thank you all for the feedback. Threaded connectors / pre threaded fittings is the best way to go!