over sizing hydraulic separators

Mike T., Swampeast MO

Hydraulic separators used in hydronics are sized for very low head loss (in other words inconsequential) in the separator itself. The separator body is often has a larger cross section than the connectors--just as would happen with 2" connections to a 6" body.

Provided you build it properly, there would be no problem to the system by using an oversized separator. Important elements are provisions for air elimination (from the very top of course) and debris collection/removal from the bottom. The mixing body of a separator is an intentional wide spot in the road where velocity is reduced. Particles that can be suspended in the piping will "fall out" in the separator--this is why you should make provision at the bottom for cleaning. I'd suggest going to the Viessmann website and looking at specs. for their separators. The basic design is simple and effective. I would suggest studying the overall length of the separator body in relation to the diameter of the connections. As the connections get bigger, the body gets longer.

[Deleted User]

building a hydro seperator and sizing.

What are the pit falls of building an over sized seperator? I need a 2" one. If i built it from 6" pipe and put some 2" tappings on it would that cause a problem ? I was brain storming on how to use up some scrap materials h have in the shop.

hot_rod

there are a few

critical dimensions on the design of a well engineered separator. And a few tricks to the air collection medium. Caleffi i-dronics 1, downloadable at www.caleffi.com has some of the details.

Watch out for ASME if you use them in a commercial application.

hr