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Need info on black pipe installation for a new twin boiler install
Hello: To summarize my situation, I'm plumbing my heating system with twin conventional high-mass boilers. The system is a converted gravity system and I'm using information aquired from Dan Holohan's book "Primary and Secondary Pumping made Easy". Mr. Holohan's book's by the way, have been a excellent resource for me... The system uses the system of splitting the heat load between two boilers to save on fuel consumption. My approximate heat load is 120k Btu, based upon my (Minnesota) design temperature of -20 below. At that time of the year, say between January and February; both boilers will be operating, and typically that is the only time of the heating season both boilers will be needed for the load: for the remainder of the season one boiler will suffice.
I'm a machinist by trade, I'm not a professional, thats why I'm seeking your advice. For app. 40 years now I've built and maintained my hydronic systems myself using your help... Most of my past experience has been with sweating copper pipe and fittings for the install. This time I want to use black pipe and forged fittings for the project, because of it's ruggedness and ease of changeover for future modifications and repairs. I just think it looks more professional, it's rugged, and directly compatible with my exsisting 111 year old black pipes and fittings. I have all the tools neccessary, but lack some of the neccessary knowledge for the project. I know how how to thread pipe and (of course) how to use pipe wrenches, but I need advice on proper placement of unions. I need to know of a good supplier of 150lb forged fittings, and I would't object to buying some NOS pipe fittings if anyone has them for sale via mail. Your future help will be greatly appreciated.