Question on tapping a CI rad

Daniel_3

There ya go. 1/4" . . . Offset sounds like it. With a #2 it made it fairly easy to remove the slotted plug. Somtimes I dremel it deeper for a better grab.

On a another note; since you have that flat top rad it reminds me I'm picking up two flat top victorian scrolled rads from some homeowner that sold the house and the new owners want them out so it's a bonus for me. I don't know what they look like but I'm hoping for some scrolled bundy's or rococo's with a marble top.

GW

Did HB Smith make radiators?

I need to convert a CI rad, it has HBS on the plugs...anyway, there's a small plug up high above the upper plug, it sure does seem bigger than a 1/4" IPS thread, but wondered if my eyes are buggin on me. I'm just trying to get a coin vent in there.

Thanks for any help on this!

Gary

Ken_40

Oh yeah.

HBS made tons of rads.

I'm looking in Dan's "E.D.R." book and there's tons of 'em.

Did you mean 1-1/4" or what you wrote, 1/4" on that top bung?

The vapor jobbies frequently had 1/2 NPT threads near the top for the inlet. Whetever it is, can you back that sucker out and then see for sure wassup?

If you do even occassional steam, Dan's book "EDR" is THE bible.

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GW

question is for the coin vent

The regular plug taps are 1 1/2". It's the little guy I need to tap/re-thread. There's a small (looks like 1/4"???) plug there now and it has a screwdriver head. Obviously it's not gonna come out without the help of a drill bit and tap.

So, do you think this is 1/4" NPT or should I not mess with it and find another way to get the air out? I just looks like it's a bit bigger than the coin vent when I compare the two.

Oh, this was a steam rad, and i wanna make it HW

Ken_40

G,

I'd just center punch the thing that looks like a slot, drill it to 1/8" NPT and tap it - as it stands now. I forget the drill size for 1/7"NPT but it's probably etched on the tap.

Seeya tonight?

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Daniel_3

It most likely 1/8" as most all CI rads had for coin vents and air valves. I know of no CI rad that had 1/4" tap for vents. Unless any vapor specific rad had such plug sizes I use a 11/64 drill bit and drill right through (if 1.8"). Don't punch it as you may damage the 1/8" threads. Use the drill bit as the threads will be preserved. Re-tap with a 1/8" npt tapper if needed. Those threads must be national pipe threads. You say IPS?

Edit : I stand corrected since it must be 1/4"

Unknown

Daniel

I`ve seen ¼" air-vents before, and IPS means iron pipe size.

Gary, if it`s slotted one of those impact-drivers you hit with a hammer may help.

Dave

Mike T., Swampeast MO

Use a properly sized slotted screwdriver and it may well turn out with relative ease. I've removed two from rads previously used for steam and didn't have to drill it out. Far, far, far easier than removing tapping plugs! Don't toss the bolt--you'll need it to plug the old steam vent hole. Both should be 1/4" NPT (approx 3/8" o.d.)

Daniel_3

Thanks for clarification Dave. Didn't know what IPS stood for. What rads have a 1/4" tapping up high other than these HB smith's? I have used one of those flathead/phillips wrench typ hand drivers. You know, the ones that are long and take a 90^ angle to the flat head or phillips. I used one to remov a couple 1/8" plugs with a slot from an Eastwood with them since you can get good torque and a good handle.

Unknown

Not too familiar,

with all the makes, but here`s one I have in my shop, it`s got a ¼" vent, could be a Nason?

Perhaps you are referring to a large offset screwdriver?,, they have their place by times.

Dave