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dual boiler setup
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JasonBrandtLewis
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JasonBrandtLewis
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Posted Mon Oct 29, 2012, 10:11am
Subject: Re: dual boiler setup
 

bcarrigg90 Said:

One day I want to build a dream machine after I've accrued several machines and their (s)pare parts.  Custom is always cooler.  Even if its expensive.  Haha

Posted October 29, 2012 link

Hmmmm . . . . a) only "cooler" if it works; and b) machines usually don't come with to many spare parts.

bcarrigg90 Said:

This particular design that I'm thinking of would be a triple boiler.  One for steam, and two separate ones for the brew temp.

Posted October 29, 2012 link

Why two?

 
A morning without coffee is sleep . . .
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bcarrigg90
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Joined: 13 Feb 2012
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Location: cincinnati
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Espresso: Delonghi EC 702
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Posted Mon Oct 29, 2012, 10:14am
Subject: Re: dual boiler setup
 

Thanks for that article on the solenoid.  

The pump idea is just a random thought.  It would be much easier and cheaper to make a large boiler with large thermal inertia if the pump was after the boiler, because it would not need to bebuilt for so much pressure.
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bcarrigg90
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Espresso: Delonghi EC 702
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Drip: French press is as close as...
Posted Mon Oct 29, 2012, 10:22am
Subject: Re: dual boiler setup
 

machines usually don't come with to many spare parts.

They do if I take them apart :)
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GVDub
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Posted Mon Oct 29, 2012, 10:41am
Subject: Re: dual boiler setup
 

bcarrigg90 Said:

Thanks for that article on the solenoid.  

The pump idea is just a random thought.  It would be much easier and cheaper to make a large boiler with large thermal inertia if the pump was after the boiler, because it would not need to bebuilt for so much pressure.

Posted October 29, 2012 link

The boiler isn't built for pump pressure, but for internal steam pressure. Pump pressure isn't even a factor in boiler construction for espresso machines, AFAIK. You're not going to save any money on the boiler by putting the pump after it, plus you create the possibility of a much more catastrophic failure. A pump blowing up or leaking if it's pumping water at environmental temperature is much easier and safer to deal with than one that's pumping superheated fluid.
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bcarrigg90
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Joined: 13 Feb 2012
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Location: cincinnati
Expertise: I live coffee

Espresso: Delonghi EC 702
Grinder: Capresso Infinity - Modified
Drip: French press is as close as...
Posted Mon Oct 29, 2012, 11:11am
Subject: Re: dual boiler setup
 

ISn't everything between the portafilter and the pump going to be holding 10 bars during a shot?
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GVDub
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Location: Los Angeles, CA
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Roaster: Behmor 1600+
Posted Mon Oct 29, 2012, 12:33pm
Subject: Re: dual boiler setup
 

bcarrigg90 Said:

ISn't everything between the portafilter and the pump going to be holding 10 bars during a shot?

Posted October 29, 2012 link

Depends on the machine and design, I think. I know that on my light-duty HX machine, there's a 2-way solenoid valve that makes sure the steam boiler is bypassed when it's pulling a shot, so the only pressure is in the HX pathway.

In the larger picture 150psi isn't that high a pressure. Scuba tanks, for example are rated somewhere upwards of 3000psi. Even "low-pressure" tanks for paintball guns are 300psi. Not that a high temperature rupture at 150psi can't be serious.
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bcarrigg90
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Joined: 13 Feb 2012
Posts: 43
Location: cincinnati
Expertise: I live coffee

Espresso: Delonghi EC 702
Grinder: Capresso Infinity - Modified
Drip: French press is as close as...
Posted Tue Oct 30, 2012, 9:41am
Subject: Re: dual boiler setup
 

Makes sense.  I'm probably going to have custom boilers machined when and if I ever get around to it.  My dad owns a machine shop so I can source material pretty cheaply and get the work done for free.

What are the chances of being able to safely swap out the steam thermostat for one with a higher temperature to get more pressure?  My delonghi has a 130C/257F thermostat for steam, so its only 1.2 bar of pressure.  If I just went up a few degrees to 130 or 135 is there any chance of a catastrophic meltdown?
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