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Date: 31 Dec 2006 13:35:47
From: mattw
Subject: Metric and 1/4" Piping in my Expobar
The PO of my machine installed a Manometer in my Expobar Pulser. Very
nice thing to have. However, he used John Guest tubing to do it (which
is rated to 240 PSI) - it blew. I replaced the tubing and it blew
again. Now I am replacing the John Guest with Copper Tubing. The only
problem is all the connections inside the Expobar are metric, I have
1/4" copper tubing and 1/4" fittings.

Any idea on how to make my copper tubing fit the metric sizing (it is
only 1mm [maybe] to large). I have never messed with copper tubing,
but it seems that trimming around the tube just to slide over the
female end of the metric compression tubing wouldn't be too detrimental
to the pressure rating of the tubing.

Has anyone encountered a similar problem, and if so how have you solved
it?

Thanks,
/mw





 
Date: 31 Dec 2006 22:00:32
From: mattw
Subject: Re: Metric and 1/4" Piping in my Expobar
There is enough teflon tubing (I assumed it was JG before getting it
apart, but now see it is different, but still plastic-y in appearance)
to get it back in production without the manometer, but I want to keep
the manometer in the line. My two ideas were - take off some of the
diameter of the copper tubing (perhaps sandpaper) or get a tiny bit
more diameter on the compression fitting (using a drill or dremel).
The issue is getting the female end of the compression fitting over the
copper tubing - everything else seems okay to use with the 1/4" copper
tubing.

Basically - I want to keep the manometer in and want to put copper
tubing in to make it more secure/sturdy/permanent.

I will try to get a pic of it soon.

/mw

Eric Svendson wrote:
> The PO probably(?) installed a JG tee in the line from the pump to the hx
> inlet.
>
> To at least get you back into production, I would suggest you return the
> machine back to its original configuration using 6 mm OD x 4 mm ID TEFLON
> tubing available from your nearest espresso parts house.
>
> Posting some pictures to alt.binaries.coffee would make the solution real
> easy.
>
> Eric S.
>



  
Date: 01 Jan 2007 09:21:18
From: Eric Svendson
Subject: Re: Metric and 1/4" Piping in my Expobar
I understand your desire to keep the pressure gage in the system (and do not
disagree), however, my intent was to get you back in production - sort of
like taking a "timeout" and then fixing the problem in the most permanent
fashion with, perhaps, some local hands-on help.

For example, the PO operated the machine (as you purchased it) for some
time, apparently successfully. You operated the machine successfully (?)
for some time and then the JG tubing or a JG fitting or whatever failed.
Those factors should play a big role in how you "fix" the problem.

Most espresso machines utilize a flexible connection (tubing) between the
pump and the hx or boiler to isolate the pump's vibration from the rest of
the machine. Using 1/4" copper tubing defeats that design. Furthermore,
the type of fitting at the ends of the tubing (stock configuration) is
unique. The tubing is forced over a tapered nipple which slightly expands
the tubing from, say, 6.0 mm to 6.1 mm. The nut is then screwed on and this
action further squeezes the tubing onto the nipple making the joint pressure
tight.

It is possible to modify the whole system to utilize 1/4" copper tubing and
adaptor fittings but you cannot succeed with copper tubing alone. It is not
designed to be used with the nuts you want to modify assumming I understand
where the failure occurred.

Eric S.


"mattw" <matthewgwells@gmail.com > wrote in message
news:1167631232.862543.301410@48g2000cwx.googlegroups.com...
> There is enough teflon tubing (I assumed it was JG before getting it
> apart, but now see it is different, but still plastic-y in appearance)
> to get it back in production without the manometer, but I want to keep
> the manometer in the line. My two ideas were - take off some of the
> diameter of the copper tubing (perhaps sandpaper) or get a tiny bit
> more diameter on the compression fitting (using a drill or dremel).
> The issue is getting the female end of the compression fitting over the
> copper tubing - everything else seems okay to use with the 1/4" copper
> tubing.
>
> Basically - I want to keep the manometer in and want to put copper
> tubing in to make it more secure/sturdy/permanent.
>
> I will try to get a pic of it soon.
>
> /mw
>
> Eric Svendson wrote:
>> The PO probably(?) installed a JG tee in the line from the pump to the hx
>> inlet.
>>
>> To at least get you back into production, I would suggest you return the
>> machine back to its original configuration using 6 mm OD x 4 mm ID TEFLON
>> tubing available from your nearest espresso parts house.
>>
>> Posting some pictures to alt.binaries.coffee would make the solution real
>> easy.
>>
>> Eric S.
>>
>




 
Date: 01 Jan 2007 00:47:00
From: Eric Svendson
Subject: Re: Metric and 1/4" Piping in my Expobar
The PO probably(?) installed a JG tee in the line from the pump to the hx
inlet.

To at least get you back into production, I would suggest you return the
machine back to its original configuration using 6 mm OD x 4 mm ID TEFLON
tubing available from your nearest espresso parts house.

Posting some pictures to alt.binaries.coffee would make the solution real
easy.

Eric S.

"mattw" <matthewgwells@gmail.com > wrote in message
news:1167600947.806451.180470@a3g2000cwd.googlegroups.com...
> The PO of my machine installed a Manometer in my Expobar Pulser. Very
> nice thing to have. However, he used John Guest tubing to do it (which
> is rated to 240 PSI) - it blew. I replaced the tubing and it blew
> again. Now I am replacing the John Guest with Copper Tubing. The only
> problem is all the connections inside the Expobar are metric, I have
> 1/4" copper tubing and 1/4" fittings.
>
> Any idea on how to make my copper tubing fit the metric sizing (it is
> only 1mm [maybe] to large). I have never messed with copper tubing,
> but it seems that trimming around the tube just to slide over the
> female end of the metric compression tubing wouldn't be too detrimental
> to the pressure rating of the tubing.
>
> Has anyone encountered a similar problem, and if so how have you solved
> it?
>
> Thanks,
> /mw
>




 
Date: 31 Dec 2006 22:40:38
From: Barry Jarrett
Subject: Re: Metric and 1/4" Piping in my Expobar
On 31 Dec 2006 13:35:47 -0800, "mattw" <matthewgwells@gmail.com >
wrote:

>again. Now I am replacing the John Guest with Copper Tubing. The only
>problem is all the connections inside the Expobar are metric, I have
>1/4" copper tubing and 1/4" fittings.
>
>Any idea on how to make my copper tubing fit the metric sizing (it is
>only 1mm [maybe] to large).

the tubing may be metric, but the fittings are most likely british
standard pipe - parallel (BSPP). i've swaged out copper tubing to
match up with metric tubing, and then hard soldered them together. for
fittings, i don't recall if 1/4"NPT will mate sufficiently with
1/4"BSPP to work. i know 3/8"NPT will mate to 3/8"BSPP with the use
of teflon tape (there's only 1 tpi difference).

fwiw, BSPP fittings & adapters can be found from several sources,
including yland metrics and mcmaster.com.