Vaporstat

tom_11

It is a one pipe system, gravity return. the longest run of 2 inch pipe is 18 ft . thank you tom

tom_11

vaporstat

I have a weil mclain 368st oil fired boiler,n would i benfit in anyway by installing a vapor stat,insted of a pressuretrol? if so what be the setting for the vaporstat. thanks tom

Brad White

Yes

Not knowing your system extent or type, there are some variables. But even a reasonable one or two pipe steam system can operate at between 8 and 10 ounces cut-out pressure.

Think of your piping and steam carrying capacity at a certain pressure drop. Many old systems were designed for between 1 and 4 ounces pressure drop per 100 equivalent feet of pipe. If your longest run of piping is 50 feet with six elbows, you are probably at 100 equivalent feet or less, as a point of reference. That may take just four ounces, with the return being by gravity.

Two-Pipe systems can do even better because of the separate return path for the condensate.