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Brad White

Brad White

Joined on May 7, 2006

Last Post on May 9, 2006

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Recent Posts

Damn.. I never saw MBFGW...

@ May 9, 2006 6:28 PM in roofer wants to use flashing pieces to cover knot holes in old

You got me, Cosmo. Duh. :)

Good News

@ May 9, 2006 5:51 PM in Any Update on Scott Mil-knee?

Thanks, Chris You will all have to take turns entertaining him and running interference. An active guy like that can get a little frustrated being held back. Give him my best wishes- Brad

You both have it right

@ May 9, 2006 5:44 PM in roofer wants to use flashing pieces to cover knot holes in old

If the garage is not heated there is no real differential of vapor pressure or temperature. Nothing to produce moisture to speak of and the only temperature rise you may have is residual from solar, the slab or your car. (If indeed anyone actually parks their car in a garage anymore... :) ) No worries about spanning over knot holes with flashing or tar paper. I have seen slate installed over skip-sheathing (sheathing across rafters with a few inches of space between, like strapping). Mind you this is even without tar paper; no leaks. My own shed has wood shingles on skip sheathing with nary a leak. And Cosmo- Kimono is Greek in origin? I learn all sorts of things here. Cool. Next you will tell me that Baklava is Greek too!

Thanks, Chris

@ May 9, 2006 6:32 AM in Steel Propress

I did not glean that- but it makes sense, although I could see HR do something whimsical with expensive stock, right? You have to admire the Germans. They wash their windows -the ones on their barns....

Thanks, Weez

@ May 9, 2006 5:55 AM in Steel Propress

Batteries gave out before I got the answer :) Would have loved to see that installation! But Hot Rod gave me a preview. That wet dream installation was, well, unbelievable...!

ASTM #'s

@ May 9, 2006 5:52 AM in Steel Propress

Cosmo, I found this chart handy for quick reference. Not all-inclusive but when the big book is in the office and if anyone could find it.... works in a pinch. http://www.howellpipe.com/howastmr.htm

You could do that....

@ May 9, 2006 5:33 AM in pipe sizing

but at least here in Massachusetts, you cannot run gas pressure over 14 inches (1/2 PSIG roughly) without a special permit. And damned if the gas company guarantees any pressure over 4 inches anyway. Your location may vary. Void where prohibited :)

Oh, I agree with face to face, absolutely

@ May 8, 2006 10:39 PM in Nice!!!

but when you start talking to a proven liar who first stated his intention to wipe a certain Levantine country off the map, cheers the flying of jet liners into our buildings and believes the Holocaust is a fable, what would one really and rationally have to talk about? Eh, wrong forum. I'm done... :)

Big fan of them

@ May 8, 2006 10:35 PM in residential chilled water systems

when over say 7.5 to 10 tons. The biggest house I designed had a 90 ton air-cooled chiller and another had a 46 ton chiller, split system air cooled, just to illustrate the possibilities. Professor Silberstein is absolutely right about the benefits, especially distance. Noise can be isolated by being more remote. Cautionary note: If you do not have 3-phase power available you may have to split up the compressors into roughly 1.5 to 2 HP chunks, the largest you can usually get on single-phase power. Thus a 12-ton chiller might have 5 or 6 compressors and more expensive wiring. First cost generally is higher; part of that is distance-related and the associated insulation of both supply and return lines. Glycol is another; you may consider that factor or seasonal lay-up. With some systems (I specify TSI/Rae Corp. chillers out of Pryor, Oklahoma) you can use the hot gas to pre-heat domestic water or use pool water as a heat sink/condensing medium.

Amen.

@ May 8, 2006 10:27 PM in Nice!!!

Iran has not exactly distinguished itself as a keeper of promises and has been known to use false promises to buy time, ignore their treaty obligations and generally not play fair in the sandbox. Besides, when conventional reactor technology is available for peaceful purposes in an oil-rich nation and they choose breeder reactor technology (which makes plutonium for, mmmmm... I wonder what?), one cannot take such a letter seriously. One piece of paper hardly trumps over 25 years of naughty behavior. The oil prices will do what they will do regardless. When Teheran gets a workable thermonuclear device, the situation will be a lot more unstable as an understatement. JMHO.

Assumed Pressure Drop?

@ May 8, 2006 10:14 PM in pipe sizing

Jim, Hi If you take an assumed total pressure drop of 0.20 inches WG and if your 600 feet is developed equivalent length, you are looking at a 2-inch IPS. It actually falls between a 1.5 and 2 inch size. 2-inch will handle 300 MBH at that load, length and pressure drop. If I take the 2-inch size and 250 MBH gas load, the total developed length (including fittings of course) can be as much as 900 feet, just so you know your outside range. Hope this helps. If your gas company requires a different total pressure drop, let me know. Brad

And don't forget to consider

@ May 8, 2006 5:25 AM in boiler blowing off

the size of the expansion tank..., especially if it is connected to an older gravity system with lots of pipe and radiator volume. Whatever type of system, was the ET at least properly sized based on volume? Rather than replace it, I would add others of the same type to reach the required acceptance volume, but make sure that they all are on a common leader pipe to one PONPC. Too often an undersized ET will work fine in the lower temperatures and when run to high limit or for DHW production, that is enough to invoke Boyle's Law. Do watch the pressure and temperature at the same time. If it leaks at all temperatures, especially when off, I would suspect a leaking DHW coil or fill valve/bypass valve. If that is the case you should be able to hear it on a still, quiet night when the moon is full... :) Just an add to Mike T.'s and Zac's points. A good handful of variables.

Solder Fittings

@ May 7, 2006 8:31 PM in plumbing qn: putting flux on copper fittings makes them not fit?

Sometimes the pipe and fitting tolerances are just too close in the same direction. Unusual but it happens. 3/4" copper tubing per ASTM B-88 is 0.875" OD with a tolerance of (IIRC) plus or minus 0.001 on diameter and 0.004 on wall thickness. (OD is the same, wall thickness changes for types M, L and K.) Fittings are manufactured per ASTM B16.22 and I cannot find the tolerances for those off-hand. Suffice it to say that they are in ID consistently larger than the tubing OD by about (IIRC) 0.0015 inches depending on size. This holds regardless if brazing type or refrigerant long sweep els or off the shelf short radius tees, although the brazing socket is not as deep as a solder joint socket. Point here being that the tubing has to have tolerances to account for swage and die wear; a little slop so that things fit in the real world. See # 4 below. It would seem that the dry fit and turning eases thoughts of "out of round" issues such as a dropped tube end. Could be that: 1) You are using too much flux and creating a suction vacuum when you try to fit them. (A thin film on each surface is all you need.) 2) You are using older or contaminated tinning flux and the tin chunks or dirt are jamming the fitting. EDIT- copper chunks as mentioned moments ago.. 3) In polishing did you use too coarse a means? (Wire Tube brush or emery cloth on the coarse side or steel wool on the fine side?) Thinking the ridges compounded by too much flux here. 4) You have a batch of pipe that is at the larger end of the tolerance scale and fittings at the smaller end of the tolerance scale. Dies and swages were worn in opposite directions to the tolerances were beginning to coincide. Things you might try: A. Use Less Flux. A schmear, neatly applied. Tinning type I like, it can cover a lot of sins. B. Use the least coarse means to polish. '000' steel wool maybe? C. Pre-tin your fittings; heat the elbow and place the tubing in the socket while hot. Use thermal expansion to your advantage. What you are seeing happens rarely in my experience (as a homeowner, handy man, landlord (ret.) and engineer. Generally a tight fit is also solved by a fresh cut and a different fitting, one the other or both.