Progress on the \"BIG JOB\"

Boilerpro_3

of how things are going. We's got most of the big piping done. Just need to do things like compression tank, reducing valves and gas regulator vents. Then pressure test the new system and the old steam piping. Then all the control work. I'm figuring about another 6 weeks. Started this May 15 and have been working on it since... with two weeks vacation thrown in.

Boilerpro

Boilerpro_3

Sorry,need to resize the pics

Dave_13

Why the pumps in parallel off the supply and then rejoining above??

Boilerpro_3

Parallel Pumps

This serves two purposes.
I can use two smaller, more common, less expensive pumps instead of one large, more expensive pump, simplfying replacement. The total flow need is divided evenly between the two. The installed cost of the two pumps with check valves and service vavles is usually only slightly higher than installing a single large pump. Purpose two is that the two pumps back each other up if one fails midwinter. Both run together on demand, but if one goes down it's outlet check valve closes, and the other pump moves out on its curve to provide a very high percentage of the design need pumping....usually about 80% or so. In this 45,000 sq ft structure, the biggest pumps are 1/6 hp, and I believe that is only the injection pumps in the middle and the boiler pumps. If I am providing multiple boilers with automatic back up, makes sense to me to do it with pumps too.

Boilerpro

Dave_13

Makes sense- and looks great!!!

Boilerpro_3

Thanks!