would this be ok

[dazer23866]

looking for a pot to build a herms would this be ok ? http://www.ebay.co.uk/itm/BUCKINGHA..._Kitchen_Cookware_GL&var=&hash=item4ab37fe464 and if so what length of 10mm copper would i need to make the coil please

 

[Muddydisco]

seems a bit on the large side being 4.5ltr the smallest one they do.

You want a herms pot to be small and react quickly to temp changes. I used an asparagus steamer but can't remember how much copper went into it.

 

[Dieseljockey]

I have the same thing in mind, talking to Eddie on Friday and I've found this....HERE at Amazon.....may be worth it.

 

[31bb3]

That's the ticket Brian :thumb:

 

[dazer23866]

thanks for the link i will buy one, just need to know roughly how much copper pipe to buy now any ideas

 

[Dieseljockey]

it's size is ...20 × 15 × 23cm will have to work out how much that holds...like MD said you don't want it too big.

 

[dazer23866]

i haven't a clue all i know is i need to get a hermes going as my mash in this weather just loses so much heat its unbelievable

 

[Dieseljockey]

How longs a piece of string??? I don't think you'll need that much...Eddie may have an idea...your only making a small coil to fit inside.

 

[dazer23866]

may just order 5 or 10 meters that should surly be enough

 

[Muddydisco]

Actually just worked it out, it holds 4 ltrs to the brim if those sizes are accurate. I'm taking the cyclinder is 15 cm arcoss and the 20cm is the handles.

You'd get at least 2-3m in it so 5 would be better size to order, if you already have chiller sorted.

 

[dazer23866]

Actually just worked it out, it holds 4 ltrs to the brim if those sizes are accurate. I'm taking the cyclinder is 15 cm arcoss and the 20cm is the handles.

You'd get at least 2-3m in it so 5 would be better size to order, if you already have chiller sorted.

amazing muddy D thanks for that 5 it will be :drunk:

 

[Kevin Wood]

Out of interest, I made a simple HERMS this weekend. I coiled some 8mm copper pipe around a tall, slim chutney jar such that it formed a coil of about 80-90mm diameter which fitted into a Tesco cheapo kettle.

The coil of pipe slips into the kettle, and the pipe ends emerge through the spout after removing the mesh scale filter, allowing the lid to be closed.

I use a Flojet air powered pump to recirculate wort through this coil during the mash and a PID with the probe in the output of the coil to regulate the temperature by driving the kettle element.

The kettle only takes 1.7 litres of water minus the amount displaced by the coil submerged in it, of course. The plastic construction means that there is minimal heat capacity in the vessel itself. I found it kept a dead constant mash temperature responded quite rapidly to changes.

It's not very shiny, though, unfortunately.

I'll try to remember to add some pictures to this thread later, if it's of interest?

 

[Dieseljockey]

I've seen a "kettle Herms" somewhere on the net....got me thinking maybe...photos please.. :thumb:

 

[dazer23866]

another problem i have is i am thinking an element with safety cut out would be ok because it will never reach boiling am i correct

 

[Muddydisco]

Yeah should never reach boiling unless you forget to turn the pump on :thumb:

 

[Kevin Wood]

Yep, the kettle will only drag the water temperature up to about 10-15 degrees C above the wort anyway, even with the element on 100% of the time, I found (obviously this is dependant on the size of the coil and flow rate through it in addition to the kettle element heat output).

During a 66 deg. C mash I found that the kettle water sat at about 72 degrees once things settled down. The lid could be closed on the kettle with no risk of it switching off. The cutout can therefore be left as a safety feature in case the pump fails.

I'll take some pictures later.

 

[dazer23866]

Yeah should never reach boiling unless you forget to turn the pump on :thumb:

the pid should stop that happening

 

[Muddydisco]

Yeah should never reach boiling unless you forget to turn the pump on :thumb:

the pid should stop that happening

No it won't the pid sensor is in the outlet of the herms about 300mm away, so no pump on will allow the water in the herms to boil before the sensor is starting to even read a temp change. In my system anyway :thumb:

 

[dazer23866]

Yeah should never reach boiling unless you forget to turn the pump on :thumb:

the pid should stop that happening

No it won't the pid sensor is in the outlet of the herms about 300mm away, so no pump on will allow the water in the herms to boil before the sensor is starting to even read a temp change. In my system anyway :thumb:

i was going to program the pid to keep the the temperature at say 66c wile i am recirculating the wort i will have pt100 in the outlet does this sound ok or am i missing something
ahh penny just droped i see what you mean now if i am not recirculating the pid will just keep on heating

 

[Muddydisco]

Shames there's no smiley for penny dropping :thumb: Yes your right pt100 in the outlet. I have boiled mine twice forgetting to turn on pump whilst pid is on and forgetting to turn pid off after turning pump off.