I think Greg and many other authors can send me an apology and say thanks for the amount of time it takes myself and others to make sense of their recipes, if we even can.
Before even starting to write this post, I have spent 40 minutes on investigating the recipe.
I'm sure these authors write good recipes and they work for them on their equipment and on whatever dodgy software they use, but it would be really nice if they went that one step further and really understood the basics of recipe publication. Existing crappy software is responsible for a lot of this nonsense.
Where this Recipe Lacks Integrity
Like most recipes in books, on the net or in magazines, critical information is missing. Here is what is missing in this recipe...
1. Poor Malt Terminology - Pale Malt can vary greatly in it's flavour and colour. Not a big deal but the pale malt should be described better. More importantly, crystal (or caramel) malt covers a massive spectrum. The term. 'crystal malt', without any further definition is meaningless.
If the author provided colour values of each gain, this would help us tremendously in interpreting the recipe. Did he?
2. Poor Volume Terminology - It's nice to see the Volume into Boil figure but, like almost every recipe, the volume at flame-out, once cooled (Volume of Ambient Wort - VAW) is not described. I think your guess of 23 litres is the best guess we can assume hammoco but another author saying, "makes 23 litres," might mean 'Volume into Fermentor (VIF)' or 'Volume into Packaging (VIP).'
3. Poor Hop Info - A high integrity recipe needs to advise the reader of the AA% of the hops that were used. The same hop, even grown in the same year, can vary wildly in its potency. Imagine your hops are like chillis. If a recipe says add three chillis, how reliable is that recipe? If it says, add three really hot chillis, then that is going to be a bit more informative.
The calculated IBU's of 30.2 might be useful but only if we knew what software was used to calculate that number and what formula that software used. In other words, we really can't do much with that number.
....
Half a tablet of Whirfloc at 5 minutes before flame-out will be the way to go. I have typed this into the file below.
Without Further Info, Here is What I Would Do...
During the 40 minutes I mentioned above, one of the things I did was to type in what info was available into a BIABacus file. I've written about all the dodgy stuff above. After you have read that, here is the important stuff...
1. See if you can gather more information on any of the above.
2. Note my changes to mash and boil times in Sections B and E.
3. I don't know what you mean by in your title by "a 20 litre b"

. I'm assuming you meant to write batch but, even if you did, it does not tell me if you mean VAW, VIF or VIP. In section B, you will see that I have guessed you meant VIF.
4. The Full Volume Variations I have made in Section W mean that you will have to use about 20% more grain (about a kilo). On this brew, you could reduce the extra grain cost by about 700 grams. if you actively sparged it. This would mean a lot more work and a compromise on quality. The links on "Sweet Liquor Shop" I gave above should help you work out what is best for you.
Save the following file under two different names and play around with the second file's Section W.
BIABacus PR1.3T - Greg Hughes - Smoked Beer - Batch 0.xls
Please Pay BIABrewer.info Back in Some Way
I am going to have to start adding something like this to all the posts that take considerable time. The above post alone has taken 95 mins, let alone anything I have written previously in this thread or today in other threads. I have another hour of things to deal with before I can even work on long-term site improvements. And, all this is after a ten hour work day!
I love being able to give careful and considered attention to questions here but it does come at a great cost to everyone, not just me. For every question I intently focus on here, each minute spent is lost on focusing carefully on finalising the first main release of the BIABacus, a new site structure and so many other things.
The site requires energy to run. Here are some easy ways you can help run it...
1. Please study any carefully written answers you receive here. (You've done a nice job on that above hammoco

).
2. Please welcome new members to the forum in the
My First Post thread.
3. Please become a Donor or an Enthusiast. It's a bit hard to see, but just click on the space just above the Forum Search at the top right of every page or
click here.
4. Please encourage others on their brewing journey. For example, any registered member could comment on
this post.
Energy-wise, far more important than any of the above is handing on knowledge that you receive here. Answering questions well takes time but also helps you clarify what you still need to know or what no one knows as yet! Atm, on this site, if you provide an answer, if anything is obviously wrong, someone would hopefully send you a PM or, if you are not confident, send me a PM and I would be happy to check your answer over.
...
Now, I am out of energy!
PP
You do not have the required permissions to view the files attached to this post.