Weil Mclain EG-65

Steamhead (in transit)

the chart in the manual says one 3-inch riser and a 3-inch header. Not the piping diagram itself but the chart next to it.

This, however, is a minimum specification. If the EG-65 has two 3-inch tappings on top, there's nothing wrong with using two 3-inch risers that are more than 24-inches above the waterline, and a 3-inch drop header. This cuts the steam's exit velocity in half and reduces the chance of water carrying over with the steam.

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Daniel_3

Do these come with two 3" supplies or just one? On the manual it says 2-3" supplies and the minimum riser size should be at least 2 1/2". I've seen some with one 3" riser and some with two 3" risers. The ones I've seen with one 3" risers could be one long counterflow main system. What's the best choice? I would say two 3" risers but I could be mistaking this preference for the wrong model.

Unknown

in my weil mclain book

For EG 65 steam boiler its one 3" pipe

Daniel_3

Actually I just got an email back from Weil Mclain support and they say there are two 3" supply tappings. According to the brochure the 2-3" tappings prove this on page 4. That is quite a bit of piping for the steam if they are full size with a dropped header.

Daniel_3

How will this effect efficiency if the two 3" risers were used? It's clear that this will cut the velocity in half but how does that translate down the line and to the radiators? Will it take a bit longer to heat up but also be supplying drier steam? There must be a significant difference in steam velocity between a 3" riser to 3" header supplying two 2" mains versus two 3" risers into a 3" dropped header to supply the 2 mains. It seems it would be more expensive for the latter because of more fittings and would only supply drier steam but less velocity and more time equalling more fuel burned. This is considering properly vented mains and proper sized piping and all things else in the proper function of course.

Steamhead (in transit)

The drier the steam

the more heat you get out of it. So anything you can do to dry out the steam will help. Larger or more risers to the header, higher risers to the header, larger header, all will help.

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