Threading Female Pipe onto a Corny Keg Post Thread?

[Michael DeGraff]

I am trying to find a female pipe that will thread onto my Cornelius keg so
that I can bypass the quick connect and use one of my old kegs as a
greensand filter.

I found the following info, submitted by MDixon. Does anyone know if these
are standard NPT or are they something unique? Can someone recommend a
supplier?

Mike

Firestone V Challenger, Firestone VI Challenger, Firestone Super Challenger
Gas 9/16"-18
Liquid 5/8" -18

Cornelius Spartan & Super Champion
Gas 19/32" - 18
Liquid 19/32" - 18


Cornelius R (pin lock)
Gas 19/32" - 18 (2-pin)
Liquid 19/32" - 18 (3-pin)


John Wood 85, Firestone Challenger
Gas 11/16" - 18
Liquid 3/4" - 18


Firestone A, Firestone R, John Wood RA, John Wood RC (pin lock)
Liquid 9/16" - 18 (2-pin)
Gas 9/16" - 18 (3-pin)

[Jeremy Ruetz]

Post by Michael DeGraff
I am trying to find a female pipe that will thread onto my Cornelius keg so
that I can bypass the quick connect and use one of my old kegs as a
greensand filter.
I found the following info, submitted by MDixon. Does anyone know if these
are standard NPT or are they something unique? Can someone recommend a
supplier?
Mike
Firestone V Challenger, Firestone VI Challenger, Firestone Super Challenger
Gas 9/16"-18
Liquid 5/8" -18
Cornelius Spartan & Super Champion
Gas 19/32" - 18
Liquid 19/32" - 18
Cornelius R (pin lock)
Gas 19/32" - 18 (2-pin)
Liquid 19/32" - 18 (3-pin)
John Wood 85, Firestone Challenger
Gas 11/16" - 18
Liquid 3/4" - 18
Firestone A, Firestone R, John Wood RA, John Wood RC (pin lock)
Liquid 9/16" - 18 (2-pin)
Gas 9/16" - 18 (3-pin)

The threads are unique, they are not even close to a National Pipe
Thread (NPT) at all. I'm a machinist by trade. I can't even find a
standard tap this size (19/32- 18).using a npt fitting will ruin your
existing threads. I would suggest using a ball lock or pin lock fitting
depending on your keg, with a short piece of tube and then what ever
fitting you want.

Jeremy

[Michael DeGraff]

Jeremy,

Thanks for the advice, that is what I was afraid of. I may just see if I
can get a piece of stainless welded to the top of the post and then have the
poppet surface drilled out in order to have an NPT thread on the open end.
It may sound like a expensive solution but I would like to get this done
right. Do you foresee any problems with this?

Mike

Post by Jeremy Ruetz

Post by Michael DeGraff
I am trying to find a female pipe that will thread onto my Cornelius keg so
that I can bypass the quick connect and use one of my old kegs as a
greensand filter.
I found the following info, submitted by MDixon. Does anyone know if these
are standard NPT or are they something unique? Can someone recommend a
supplier?
Mike
Firestone V Challenger, Firestone VI Challenger, Firestone Super Challenger
Gas 9/16"-18
Liquid 5/8" -18
Cornelius Spartan & Super Champion
Gas 19/32" - 18
Liquid 19/32" - 18
Cornelius R (pin lock)
Gas 19/32" - 18 (2-pin)
Liquid 19/32" - 18 (3-pin)
John Wood 85, Firestone Challenger
Gas 11/16" - 18
Liquid 3/4" - 18
Firestone A, Firestone R, John Wood RA, John Wood RC (pin lock)
Liquid 9/16" - 18 (2-pin)
Gas 9/16" - 18 (3-pin)

The threads are unique, they are not even close to a National Pipe
Thread (NPT) at all. I'm a machinist by trade. I can't even find a
standard tap this size (19/32- 18).using a npt fitting will ruin your
existing threads. I would suggest using a ball lock or pin lock fitting
depending on your keg, with a short piece of tube and then what ever
fitting you want.
Jeremy

[MDixon]

Post by Michael DeGraff
I am trying to find a female pipe that will thread onto my Cornelius keg so
that I can bypass the quick connect and use one of my old kegs as a
greensand filter.
I found the following info, submitted by MDixon. Does anyone know if these
are standard NPT or are they something unique? Can someone recommend a
supplier?

I'm not exactly sure what you are trying to do, sounds like connecting the
post to a piece of pipe.

It looks like that is a compressed gas association standard. I found this by
searching 9/16 18 thread on Google
http://www.eldonjames.com/html/sn9.html

I kinda doubt you are going to be able to hard plumb from the gas fitting to
pipe without using some hose to make the transition.

Cheers,
Mike

[Michael DeGraff]

Mike

I made a greensand filter out of an old corny keg, it oxidizes the soluable
iron in my well water. This is nescesary because the rest of my house uses
a water softener, and I am tired of filling shopping carts with gallon jugs
of "spring" water.

So basically I run well water through a keg that is full of greensand. I go
in the gas post and out the liquid post. The pressure drop is enormous so I
thought eliminating the quick connects could help me increase the flow.

So I guess it would be possible to find a brass gas fitting like you said
that could be drilled out on on end and either threaded with NPT using a tap
and die, a compression fitting or I could sweat fit it.

Mike

Post by MDixon

Post by Michael DeGraff
I am trying to find a female pipe that will thread onto my Cornelius keg

so

Post by Michael DeGraff
that I can bypass the quick connect and use one of my old kegs as a
greensand filter.
I found the following info, submitted by MDixon. Does anyone know if

these

Post by Michael DeGraff
are standard NPT or are they something unique? Can someone recommend a
supplier?

I'm not exactly sure what you are trying to do, sounds like connecting the
post to a piece of pipe.
It looks like that is a compressed gas association standard. I found this by
searching 9/16 18 thread on Google
http://www.eldonjames.com/html/sn9.html
I kinda doubt you are going to be able to hard plumb from the gas fitting to
pipe without using some hose to make the transition.
Cheers,
Mike

[John 'Shaggy' Kolesar]

Post by Michael DeGraff
Mike
I made a greensand filter out of an old corny keg, it oxidizes the soluable
iron in my well water. This is nescesary because the rest of my house uses
a water softener, and I am tired of filling shopping carts with gallon jugs
of "spring" water.
So basically I run well water through a keg that is full of greensand. I go
in the gas post and out the liquid post. The pressure drop is enormous so I
thought eliminating the quick connects could help me increase the flow.

I suspect that the pressure drop is more due to the fact that the post has
a very narrow opening, not whether you have a QD on it or a pipe. In other
words, I would think a straight pipe that's the same diameter as the QD would
have a similar pressure drop. I think the real solution here would be to
increase the size of the post opening in the keg, and then weld on a new
fitting. That should do more to eliminate the pressure issue.


John.

[Michael DeGraff]

John,

OK, I hadn't thought about welding something directly to the keg. I guess
in that case though I would need a keg without rubber handles. That was my
fist idea though, weld a pipe to the top of the QD post and drill the
interior out.

So you think the resistance to flow is due to the pipe diameter on the QD?
I would think that the internals of the QD are even more narrow.

Well it works as is anyway, making brewing liquor as we speak, actually last
night and all morning!

Thanks,

Mike

Post by John 'Shaggy' Kolesar

Post by Michael DeGraff
Mike
I made a greensand filter out of an old corny keg, it oxidizes the soluable
iron in my well water. This is nescesary because the rest of my house uses
a water softener, and I am tired of filling shopping carts with gallon jugs
of "spring" water.
So basically I run well water through a keg that is full of greensand.

I go

Post by John 'Shaggy' Kolesar

Post by Michael DeGraff
in the gas post and out the liquid post. The pressure drop is enormous so I
thought eliminating the quick connects could help me increase the flow.

I suspect that the pressure drop is more due to the fact that the post has
a very narrow opening, not whether you have a QD on it or a pipe. In other
words, I would think a straight pipe that's the same diameter as the QD would
have a similar pressure drop. I think the real solution here would be to
increase the size of the post opening in the keg, and then weld on a new
fitting. That should do more to eliminate the pressure issue.
John.

[two bob]

Post by Michael DeGraff
I am trying to find a female pipe that will thread onto my Cornelius keg so
that I can bypass the quick connect and use one of my old kegs as a
greensand filter.

I converted a small (10ltr) corny into a still a while ago, and found that
standard plumbing threads and fittings went straight on.