What's the EDR of a

Abro

3" riser?

Unknown

Is this,

what your looking for?
I got this from the Burnham site.

Abro

possibly

but the link isn't working. I looked on the Burnham site, but I couldn' find it.

Mike T., Swampeast MO

I believe it would be the actual outer surface area of the pipe.

If you look here under "Resources" and select "Hot Tech Topics" you'll find tables for heat loss from bare horizontal pipes--both iron/steel and copper. They're arranged in alphabetical order and all begin with "Heat loss from".

I have a feeling though that loss from a horizontal pipe will be somewhat higher than from a vertical. Some of the earliest radiators were made up over vertical pipes, each of which had one square foot of actual surface area and each of which was one square foot EDR.

The old "pipe coil" radiators (made on site with screwed pipe and special manifolds) that were made up of rows of mainly horizontal pipes also had their EDR based on actual surface area, but my old reference books say that they were especially effective at delivering heat. Compared to the "standard" two-column, 38" radiator they delivered about 17% more BTUs on an EDR basis.

EDR [seems] to be a rather murky standard. The original standard was the original radiator--Gold "mattress"--with it based on the rectangular area (not counting dimples) of one side. {Someone please correct me if it was based on both sides.)

John Starcher_4

For some reason.....

....some PDF files will download, yet you'll see a blank screen. I've found that clicking on the 'page' icon to the left will often times make the text appear magically.

DanHolohan

Here you go

It depends on the room temperature and the steam temperature. You'll have to do a bit of calculating.