. Putting it all together sounds like Parti-gyle - so it's time for an experiment! (It's nIPAr as in nipper, or child of Serious IPA 
)I want the IPA about OG=1.085 and the nIPAr about 1.042, so I stick 14kg of PM into Beer Engine for 50L and end up with 1.063 - should be close enough for a first go. (The nIPAr should be about 1.042 before adding some wheat malt.)
I am going to mash with 35L of liquor and want 33L for the first wort, so top up the first batch sparge with 33 - (35 - 14) = 12L. Then add 17.5L for the second sparge and 17.5L for the third sparge to get the nIPAr wort.
If I end up with the Serious IPA wort too high, I can always swap a bit round. If it is too low, well tough, it should still make two decent beers!
The Serious IPA will have 500gms of WGV for full boil and the nIPAr will have 200gms of Wheat Malt Extract for body (and making the OG=1.045) and Cascade hops similar to Ollosson's Townes IPA but the sums don't tie up with Beer Engine, so it will be 73gms for 90mins and 20gms for 15mins (AA=4.6) - which is also exactly the 93gms of MH hops I have open
.With a permanent setup, a two brew day is not too arduous, in fact I had three consecutive two brew days last week in an attempt to re-build stocks. The bottle neck is of course getting the copper empty for the first sparge of the second brew. In this case I will be collecting the first wort in the copper and then the second wort, in two batches at least, in spare FVs. This will lead to a major delay getting the second wort up to boiling as it will have cooled significantly. So it will be an early start, with the HLT coming on at about 02:30am and me getting the mash on as soon as I can crawl out of the pit
.Out of bed before the Blackbird has coughed or the sparrow farted, 05:45. The mash is on and stable, RIMSing at 06:15.
I am planning on a 90 minute mash for the first wort, followed by another 90 minute for the second. At 07:45 I add 12L from the HLT, stir and re-circulate for 10 minutes to clear the wort and then start to drain.
First runnings:
Refractometer shows 17.6 brix, hydrometer shows 1.070 at 33C so I am going to be low.
I stop the drain and start the RIMS again. I am aiming for a pre-boil gravity of 1.077.
By 09:00, the wort in the mash tun is 1.076@33C, which should be 1.080 at 20C. There is already 10L at 1.074, so draining now should be closer to what I am trying to achieve.
By 09:25 I have 32.5L in the copper at Bx=18.7. I don't trust the refractometer on its own, unless making comparative readings, but I have now cross checked at 17.6 and 19.3, so I am going to take this as exactly SG=1.077.
The boiler heater went on at 09:10, when it looked like things were going reasonably well.
Having used a Beauclaire Outdoor Cooking burner for 31 brews, I am trying a dual plate Induction Hob, nominally 3.1kW total (1.8 and 1.3kW), but measures at 2.9kW. (PF 0.98 if anyone is interested!)
About £105 + vat on ebay
So far (six prior brews) I find it will not produce a good rolling boil without having the lid partially on - i.e. a gap of 50-125mm. Otherwise the results seem reasonable and it is slightly less likely to kill me...
I went for the two plate unit rather than a single 3.5kW jobby for several reasons, one being that this is no lip and the boiler can stand on the plates without any gap. In fact it sits on two side supports and the hob is spring loaded (terrible temporary bodge...) to force it up in contact with the boiler bottom. I have a feeling it would complain if it had up to 60L of wort on it directly!
The big problem at the moment is that the yeast - Wyeast Scottish - is doing .... nothing . It was a month out of date when it arrived and I had the choice of sending it back or going with it . Sending it back would have meant using something else anyway . The bag did swell somewhat before I dumped it in a 1L starter on the stir plate but over the last 16 hours it has done nothing more .Back to the brew. Once I had drained the mash tun, I added 17.5L from the HLT as planned. That will have at least 1 hour more RIMSing.
Judging by the difference between wort OG after 90 minutes and 140 minutes, I am going to be doing a lot more longer mashes. I had however planned on 180 mins total as per Durden Park.
I usually put the first hops in when I turn the heater on, but this time I am going to give myself a hop sauna and chuck the full 500gms in when it begins to boil. With the fan off and the door shut. The Brewairy is about 1.2 x 2.4 x 2.7m....
500gms of WGV:
10:00 and it must have been boiling for a few minutes,
I was sad to leave hop heaven.
The second wort is 10.4 Brix at present, probably about 1.042, but this is only the next 17.5L and I need to double that. As it has now had 4 hours, I think I will miss my 1.042 target.
Another advantage of RIMS is being able to take as many SG samples as you like, although I have never bothered to do it before.
A while later...
11:05 Second wort in mash tun now 11.4 brix, about 1.046, drain into FV.
There's a lot going on here - first wort boiling, second wort draining into FV, seven FVs fermenting or just finished:
11:28 Drained. Add last sparge/mash water, 17.5L and start RIMS once again.
In the last 5 minutes of the boil, I did something I have never tried before. Using a large sieve, I scooped out a large part of the hops, squeezing between a second sieve each time.
Squeezed spent hops:
11.45 Start cooling from 95C, a bit hot for the pump but for a short time.
Recirc cooling:
Set the Controls for the Heart of the Sun - valves to cooling re-cirulation:
11.57 12 minutes after starting the cooling, the wort is down to 25C. It's very easy this time of year with the incoming mains water at about 4C!. Thanks to adm's post, I now have a 50 plate chiller from Germany ready for when it starts to get warmer. I will probably use the old one for cooling beer in the summer, along with the Maxi 210 I picked up two weeks ago thanks to Mauri's sharp ebay eyes!
I am leaving the last mash/sparge running until the boiler is ready - after all, some people mash all night I believe....
A really grotty pic! - Nearly there on temperature but showing the hob trial testbed with its very temporary bodged springs!
The boiler is showing 24.5L and now has foam due to the intentional aeration during cooling:
As for the starter and not having the time to do anything fancy now that the Wyeast had failed on me, I chucked 36gms of US-05 into 1L of starter and stuck it on a stir plate a couple of hours ago. I also have another starter of US-05 which is/was ready for the nIPAr, so I will use some of each. I had already checked that US-05 will work at this OG. To add insult to injury, I have a very fat bag of Wyeast London ESB ready for Sunday, it was smacked several hours after the Scottish
So the cooled wort has now had 30 minutes to settle, let's see what we end up with....
Wort into FV:
19.5L at 22.7 Brix, hydrometer reads 1.095, ties up exactly with MoreBeer .xls.
Even with the early removal of hops, I still lost another 5L in wet hops and boiler dead space.
By 13:00 the boiler is again empty, so I start the final mash tun drain. Boiler heating on at 13:15. and earlier FV collected second wort is added. I am going to add 200gms of Wheat Malt Extract and the first 73 gms of Cascade.
I now have 35.5L at 1.038, which should give 32L at 1.042, adding 200gms of Dried Malt Extract should get this back to my target of 1.045, and I should end up with 29-28L in theFV. If I boiled it for longer and ended up with 25L in the FV and 3L losses, it would have been about 1.048, but either way, not far out.
Back to the Serious IPA. My target was 1.085, so I need to add about 2.5L of starter/boiled water.
This time I am going to use oxygen and the stainless steel airstone I got from H&G. I have not bothered with this much lately because all the fermentations go off like a rocket and I spend half the time mopping up overflowed yeast....
The nIPAr is boiling by 14:15 and with the mash tun emptied and washed out, I need a rest.
To cut a long story short, by 17:30 I have 28L in the second FV at 12.0 brix, checked by hydrometer at 1.048 - a bit more and a bit higher than expected but nice!!
Thinks, need a new garage... 
