232/300 valve thread question ?

I found a couple steel 100's at a pawn shop but they have the 300 bar
din valve on them. Are the threads in this tank such that a 232 bar valve
with the convertible K insert will screw into this tank, or are the threads
different ? thanks for any comments....

Kevin Falconer Fort Myers, FL

Odds are that the tank neck threads are the standard US 3/4in thread,
and as such will accept any valve threaded correctly.

Slim but possible is that the tank necks are European/UK threaded, and
as such will required valves that are threaded for those specific
tanks.

However, realize that the odds are that if the tank is NOT standsard
US 3/4in thread, then they are also likely NOT DOT approved and you
will have problems getting them filled OR Hydro'd in the US

John

On 30 Aug 2004 03:14:54 -0700, kpjfalconer@aol.com (Kevin Falconer)
wrote:

>I found a couple steel 100's at a pawn shop but they have the 300 bar
>din valve on them. Are the threads in this tank such that a 232 bar valve
>with the convertible K insert will screw into this tank, or are the threads
>different ? thanks for any comments....
>
>Kevin Falconer Fort Myers, FL

In article <4d967234.0408300214.7a700f7a@posting.google.com >,
kpjfalconer@aol.com says...
> I found a couple steel 100's at a pawn shop but they have the 300 bar
> din valve on them. Are the threads in this tank such that a 232 bar valve
> with the convertible K insert will screw into this tank, or are the threads
> different ? thanks for any comments....

Look at what is stamped in the tank. if it is 2400, the valves will fit.
If it is 3500, tha threads are different

In article <4d967234.0408300214.7a700f7a@posting.google.com >,
Kevin Falconer <kpjfalconer@aol.com> wrote:
>
>
>I found a couple steel 100's at a pawn shop but they have the 300 bar
>din valve on them. Are the threads in this tank such that a 232 bar valve
>with the convertible K insert will screw into this tank, or are the threads
>different ? thanks for any comments....
>
>Kevin Falconer Fort Myers, FL

Older HP tanks are usually 7/8" neck threads and will NOT work with standard
valves.

If the tanks have DOT/CTC markings on them, then they are EITHER 3/4" or
7/8" neck threads. The 7/8 threads are SMALLER in diameter (it has to do
with the standards - they're different, not different sizes of the same
standard!); its obvious on inspection of the tank neck which you've got.

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Replying for Scott:
"Kevin Falconer" <kpjfalconer@aol.com> wrote in message
news:4d967234.0408300214.7a700f7a@posting.google.c om...

> I found a couple steel 100's at a pawn shop but they have the 300 bar
> din valve on them. Are the threads in this tank such that a 232 bar valve
> with the convertible K insert will screw into this tank, or are the

threads

> different ? thanks for any comments....
>
> Kevin Falconer Fort Myers, FL

Most US LP tanks are threaded thusly:

3/4 National Pipe Straight (the 3/4 defines the ID of the pipe):

Outside diameter of pipe....................... 1.0500
Threads per inch............................... 14.0
Decimal lead................................... 0.07143
Minimum minor diameter......................... 0.925
Minimum pitch diameter......................... 0.9822
Maximum pitch diameter......................... 0.9956

US HP Tanks are threaded thusly:

7/8-16 UN-2B INTERNAL THREAD

Number of starts............................... 1
Threads per inch............................... 16.0000
METRIC INCH
Decimal lead is.................. 1.587500 0.06250
Major dia. is.................... 22.22500 0.8750 min.
Pitch dia. is................from 21.19376 0.8344
to 21.35632 0.8408
Minor dia. is................from 20.49780 0.807
to 20.85340 0.821
Pitch dia. tol. for 2B is........ 0.16256 0.00640

Easy way to tell is with a quarter;

A quarter will fit through the inside of a 3/4" NPS, but not the 7/8 16
UN.

Now, just to throw you another curve, some European and Australian tanks
are
threaded M22 x 1.5.

DIN fittings are actually a G 5/8 BSP ("G" for "Gas", 5/8 is the ID of
the
pipe, BSP is British Straight Pipe)

The PST HP series cylinders are fine for use in the US, and they fall
under the same exemption as the current PST E series cylinders.

The current E series cylinders use the standard 3/4 thread and a
232bar convertible DIN. The old HP series (as well as Genesis and
Asahi) used a 300bar DIN that is not convertible and uses a 7/8
machine thread.

Not possible to know 100%, but from probability, these pawn shop tanks
are most likely PST, Genesis, or Asahi... all perfectly "legal" in the
US.


On Mon, 30 Aug 2004 10:56:17 -0500, John <john@interoz.com> wrote:

>Odds are that the tank neck threads are the standard US 3/4in thread,
>and as such will accept any valve threaded correctly.
>
>Slim but possible is that the tank necks are European/UK threaded, and
>as such will required valves that are threaded for those specific
>tanks.
>
>However, realize that the odds are that if the tank is NOT standsard
>US 3/4in thread, then they are also likely NOT DOT approved and you
>will have problems getting them filled OR Hydro'd in the US
>
>John
>
>On 30 Aug 2004 03:14:54 -0700, kpjfalconer@aol.com (Kevin Falconer)
>wrote:
>
>>I found a couple steel 100's at a pawn shop but they have the 300 bar
>>din valve on them. Are the threads in this tank such that a 232 bar valve
>>with the convertible K insert will screw into this tank, or are the threads
>>different ? thanks for any comments....
>>
>>Kevin Falconer Fort Myers, FL
>


--- Rich
http://richlockyer.tripod.com/

On Wed, 01 Sep 2004 20:37:18 -0700, Rich Lockyer
<rlockyer@linkline.DONTSPAMME.com> wrote:

>On 30 Aug 2004 03:14:54 -0700, kpjfalconer@aol.com (Kevin Falconer)
>wrote:
>
>>I found a couple steel 100's at a pawn shop but they have the 300 bar
>>din valve on them. Are the threads in this tank such that a 232 bar valve
>>with the convertible K insert will screw into this tank, or are the threads
>>different ? thanks for any comments....
>
>Different. 7/8 Machine vs 3/4 Pipe

Wrong. Pipe threads haven't been used since the early/mid 1960s.

Scott W.

On Sat, 04 Sep 2004 00:13:35 -0700, Scott W. <scottw@ils.net> wrote:

>On Wed, 01 Sep 2004 20:37:18 -0700, Rich Lockyer
><rlockyer@linkline.DONTSPAMME.com> wrote:
>
>>On 30 Aug 2004 03:14:54 -0700, kpjfalconer@aol.com (Kevin Falconer)
>>wrote:
>>
>>>I found a couple steel 100's at a pawn shop but they have the 300 bar
>>>din valve on them. Are the threads in this tank such that a 232 bar valve
>>>with the convertible K insert will screw into this tank, or are the threads
>>>different ? thanks for any comments....
>>
>>Different. 7/8 Machine vs 3/4 Pipe
>
>Wrong. Pipe threads haven't been used since the early/mid 1960s.

No, I'm right.

It is still a pipe thread (explains why the 3/4 thread is larger than
the 7/8 thread.)

Specifically, it is a 3/4"-14 NPSM (National Pipe Straight Mechanical)
http://www.ppt-hose-tech.com/Downloa...ing%20Info.pdf

You are correct that tapered pipe threads (NPT) were phased out in the
early 1960s.



--- Rich
http://richlockyer.tripod.com/

Al wrote >

> Most US LP tanks are threaded thusly:
>
> 3/4 National Pipe Straight (the 3/4 defines the ID of the pipe):
>
> Outside diameter of pipe....................... 1.0500
> Threads per inch............................... 14.0


Al, thanks a bunch for the dimensions, I'll be sure to check these
thread diameters before buying a tank with hopes of converting to a
232 bar valve. I've not had time to get back to look at these tanks
but since i wont buy without a visual maybe i can get the valve removed
and measure threads and check tank at same time, thanks again for the
thread specs !

Kevin Falconer Fort Myers, FL