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Twin Steam Boilers - 4 Stages of Firing Rates

JStarJStar Posts: 2,320Member ✭✭✭
So, we just wrapped up another twin boiler setup on a Warren/Webster vapor system. Oil to gas conversion. Since the SMITH 8 is no longer in production, we've been installing a lot of PEERLESS 63 series boilers. The only way we feel good about an atmospheric boiler is by installing a 2-stage gas control valve in them. Robertshaw makes a series 700 two-stage valve that comes in two different sizes up to 720,000 BTUH. Super easy to retrofit and install. The High is 100% and Low is 60%. It's the absolute perfect fit for High/Low on a steam system. As soon as the mains are hot, you can drop out your pick-up factor and run on Low fire until the t-stat is satisfied. On this job, we're controlling 4 separate firing rates. I can maintain 4-8 ounces of pressure with just the Low fire of one boiler.

We installed orifice plates in all of the rads/convectors, as well as upgraded 3 original WW crossover traps. The Air Eliminator check valve is still functional and maintaining a massive vacuum. It takes less than 5 minutes to get 50 feet of main hot.

Each boiler has its own 3" drop header that feeds a 5" system drop header. Dry steam is happy steam!

The picture quality is not great. One day, I'll get some better photos.
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