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Dan Holohan

Dan Holohan

Joined on March 4, 2009

Last Post on September 16, 2014

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Recent Posts

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Thanks, Jammer.

@ April 1, 2014 6:54 PM in Best quote ever Dan :)

Your newsletter always makes me smile. And think, especially the last one. Thanks for all you do.

We'll see how this goes.

@ March 31, 2014 9:25 AM in Greening Steam is now a Kindle book.

And then decide. Thanks for asking.


@ March 28, 2014 1:27 PM in Vents spraying water

Can you post a sketch of how it was and how you changed it? That will help us help you.

Greening Steam is now a Kindle book.

@ March 28, 2014 1:23 PM in Greening Steam is now a Kindle book.

For those who enjoy electrons more than paper.


@ March 25, 2014 7:09 AM in Ornate Cast Iron Radiators

Very nice! Here are the ratings:


@ March 21, 2014 8:09 PM in Pump with integral air vent

B&G had what they called their Air Control Booster Package when I was starting out. The impeller spun the air to the putter edge of the volute and a volute-mounted vent spit it out. The price was too high and they discontinued it. Neat idea., though.

Everything old is new again.


@ March 18, 2014 3:54 PM in steam gorton valve

That's the air going back into the system. Steam systems breathe, just like us. When steam forms, it expands 1,700 times, pushing the air out of the vents. Then the steam condenses and shrinks, and the air comes back in. Happens on every cycle.

Ray's book is great.

@ March 14, 2014 7:45 AM in Intro books to boilers

I've moved your post to this section.

@ March 14, 2014 5:34 AM in Steam boiler questions

It's a high-pressure boiler, used to make heat, to iron clothes in this case. You can't use it on a heating system for a building because its steam nozzle is too small for low-pressure steam. It's a used boiler and worth whatever someone is willing to offer you. It would help if you posted the location of the boiler. Thanks. 


@ March 11, 2014 1:21 PM in Dans Reading List

An amazing book

I loved that book.

@ March 11, 2014 1:09 PM in Dans Reading List

So many layers to that saga. A great read. Thanks.


@ March 11, 2014 6:09 AM in Dans Reading List

You got my day started right.

Home Home News Local New England U.S. World Police & Fire Courts Economy Education Environment Government Health Special Reports Politics Sport

@ March 10, 2014 5:16 PM in Legionnaire's found in heating system

I think this may be domestic hot water.

It's gone.

@ March 9, 2014 2:34 PM in Dans Reading List

We're in the process of rebuilding the whole site and the list didn't fit with the new plan. Thanks for missing it.


@ March 7, 2014 9:06 AM in Opportunity Knocks

I was brutal. No semicolon left behind! 

All the metal in the system

@ March 6, 2014 7:38 AM in HELP with new steam boiler

and that includes the pipes between the boiler and the radiators, has to be brought from ambient temperature to 215 degrees. That's a function of specific heat. It takes so many Btu to raise a pound of iron or steel one degree Fahrenheit. Since the 1950s, manufacturers have suggested using a pick-up factor of 1.33 for the piping, and that assumes the steam piping is insulated with 1" of insulation. I'd use that factor.

As for the risers being used as radiators, here's the EDR:

1-1/4" = .63 EDR per linear foot
1-1/2" = .73 EDR per linear foot
2" = .88 EDR per linear foot

What sort of building?

@ March 5, 2014 4:56 PM in Steam Vent

Private house or apartment building?

Some questions:

@ March 5, 2014 2:02 PM in HELP with new steam boiler

Are all your steam pipes insulated?

When you say "generous" what does that mean? How much have you already added to what's actually in the house?

A Btu is a Btu, whether it comes from burning oil or gas, so we look at the rating on the boiler.

The boiler's ability to produce steam has to match the system's ability to condense steam, which is why the measuring of the radiation is so important. If you're not certain, it would be good to get a steam-savvy pro in to do that for you.

Another issue is the piping of the new boiler. That has to be just right if you're going to be happy afterward.

I would also want to know why the Crown lasted only six years.


@ March 4, 2014 6:58 PM in Opportunity Knocks

This Kelly is very much a woman, but we do raise them tough.

Thanks for sharing, Mary Beth!

@ March 4, 2014 6:31 PM in Opportunity Knocks

You're very talented. I really enjoyed your stories. Thanks!

Outdoor reset helps

@ March 4, 2014 5:20 PM in Baseboard noise

Lessens the big temperature swing hitting the radiator. 

She's a natural.

@ March 4, 2014 4:57 PM in Opportunity Knocks

But thanks! She really has an amazing way with words. She blogs about getting kids to love reading and writing. You can read some of her stuff here:

Crazy about her.  Three more smart people are going to be feeling the same soon.
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