Question about Wort left in a HERMS system

[dirtybird410]

So, I am starting to design a HERMS system and I have to say I am a little baffled by the possiblity of left over wort through the recirculation pipe in the HLT.

So,
Essentially, you pump the wort from the mash tun through a copper/stainless steel pipe inside the HLT back out and into the mash tun.

Everything I am reading is you need around 25ft of 1/2' pipe for the recirculation.

My math shows that is close to 1 gallon of wort left over in the pipe when the pump stops churning

As you can't run the pump (I use) dry, how do I get the 1 gallon of sugary goodness out of the pipe and into my boil vessel once the mash is done?

Any information would be greatly appreciated as this is pretty much the only thing that I am really hung up on switching over to a HERMS system.

Cheers

 

[NoH20]

Pump your sparge water through it.....

Todd

 

[Yooper]

Pump your sparge water through it.....

Todd

Right. Not only do you move the wort out of the HEX, you clean it by pumping another 6 gallons of 170 degree water through it after. (or however much sparge water you need).