The discussion in 1 or 2 risers
's recent thread) sparked my interest in this; I suddenly wanted to compare the velocity of the steam in the risers of the various configurations being suggested, along with that of other boilers cited in this thought-provoking discussion.
I found (as @The Steam Whisperer
pointed out) the formulas for calculating Steam Velocity in my copy of @DanHolohan
's The Lost Art of Steam Heating Revisited
. Being mathematically challenged (I'm fully capable adding the same column of figures five times on a calculator, and getting five different results), whenever I have an algebra problem I build a quick-and-dirty tool on an Excel spreadsheet and let the computer do the math for me. This I did, and after working with this tool for a bit realized that it could be of value to others in the HeatingHelp community.
So I prettied-up the spreadsheets, added tabs with a Specific Volume look-up, and a tool to calculate Gross Output in lbs/hour
from other types of gross and net boiler outputs. The result is the attached Excel workbook (Steam velocity.xlsx). Anyone who has Excel, or any other program that can open and run Excel workbooks is encouraged to download and try it; comments and suggestions are most welcome. For those who lack the software or inclination deal with an Excel workbook, I've also attached three tables, in .pdf format which can be viewed and printed using Adobe Reader. Here's what one of those tables look like:
And here's are examples of using the tables:
I plan to add more tables and such, as I have time, and upload them here. This will likely include tables with the data for popular residential-size boilers already filled in. This is a small way of giving back to the HeatingHelp community.
Please let me know what you think.
6/26/20 - Uploaded table for WM EG Gas Boilers in pdf format