two pipe steam

Steamhead (in transit)

a shutoff valve on the return of each radiator as well as on the supply, this would be the "two-pipe, air-vent" system. You will probably find that all the radiator returns drip into the wet return.

This system was the first attempt to eliminate the counter-flow in the pipes that we find in the one-pipe system, and give some degree of temperature control at each radiator. It left something to be desired, and this led to the development of the various Vapor systems.

The important thing to remember with this system is- keep the pressure LOW! This means use a Vaporstat instead of a Pressuretrol. Vent the heck out of the steam mains so the steam distributes quickly on no more pressure then you can produce with your lungs.

If you find that this system has dry returns, do NOT vent them! On this type of systems the dry returns would handle water only, not air as we find on Vapor systems.

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j a_2

two pipe steam

looked at a job today went right to basement as usual and a typical steam boiler replacement i think..went up stairs to size the rads and then noticed it was a two pipe of sort system...both fittings on bottom of radiator one in one out...went back down and noticed no main vents and wet return was piped lide a normal one pipe steam system except for what appears to be a old swing check..before i accept the job i figured i would ask you guys your opinion..could not find exact pic in dans book lost art can you tell me what i may be up aginst not a common system at all upm here in bean town thanks ja

Steamhead (in transit)

Were there

air vents on the radiators?

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j a_2

yes little ones

j a_2

thanks steamhead

thanks steamhead for the info i am going back over tues and take a closer look at the system i will let you know my findings ja

Steamhead (in transit)

Take some pics

and post them here- we'd love to see this old beauty!

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j a_2

will do

i will take some pics and post them this week thanks again Steamhead