Yere all not thinking straight on this.
The water won't all flash to steam at once as the pressure will keep it from
doing so. There is no overpressure possible as the higher pressure will
stop the water from turning into steam. It is a balance that is a basic
function of nature. Otherwise, you'd have boilers suddenly turning their
water into steam at huge pressures and the boiler blowing up! It jest don't
happen that way!
For a particular temp, the boiling point is set and the temp needs to go up
to get more pressure to occur. Without that temperature increase, the
pressure keeps putting the steam back into water as a natural balance that
never gets out of whack.

--
Why isn't there an Ozone Hole at the NORTH Pole?

Bob May wrote:

Yere all not thinking straight on this.
The water won't all flash to steam at once as the pressure will keep it from
doing so. There is no overpressure possible as the higher pressure will
stop the water from turning into steam. It is a balance that is a basic
function of nature. Otherwise, you'd have boilers suddenly turning their
water into steam at huge pressures and the boiler blowing up! It jest don't
happen that way!
For a particular temp, the boiling point is set and the temp needs to go up
to get more pressure to occur. Without that temperature increase, the
pressure keeps putting the steam back into water as a natural balance that
never gets out of whack.

I think that in one scenario, the pressure is suddenly LOWERED (by opening
the valve) thus you lose your equilibrium. In the other scenario, when the
water sloshes onto the red-hot metal, then the temperature is suddenly RAISED,
so you lose your equilibrium that way.

And everyone's point is that boilers *do* blow up.

Right?

still trying to get this all straight

GWE

If you remove the water from the boiler for a while, you do get really hot
metal and that does make for a very high pressure as the heat from the metal
is transfered to the water. THIS DOES LEAD TO OVERPRESSURES AND BOILER
RUPTURES! It however isn't what you guys have been discussing tho. IN the
overtemped boiler from a lack of water (note that the boiler won't get that
hot if the water was there!) you put the water in, the temporary condition
(remember that the temp of the metal is a lot more than what is normal for
the boiler's metal when it is wet with a layer of water) is that the boiler
has a lot more capacity to heat the water than it normally has and thus the
boiler pressure starts climbing into the region where the boiler can't hold
the pressure and then you usually have a big boom! This isn't because the
water suddenly decides to expand into steam due to a pressure drop or any
other thing but what is exactly normal for the whole process of boiling
water in a boiler.
I'll also note that the cooler water elsewhere in the boiler will be doing
as best possible to readsorb the steam but will fail as there will be too
much of it to do immediately due to the lack of ability to transfer the
latent heat elsewhere in the water. Things are thus unstable only in the
ability to transfer the heat moved from one point to another.
Maxwell's demons don't really suddenly move all of the atoms of air into one
small part of the room and they don't move all of the heat into one small
part of the water in a boiler either. Trying to make them do so is merely
an exercise in frustration, whether you try to do it as an exercisce in your
mind or in reality so don't bother to try to do so. It just shows how
little you know and how much you wish reality to conform to what your
wishes for it to be.
--
Why isn't there an Ozone Hole at the NORTH Pole?

Grant Erwin wrote:
: And everyone's point is that boilers *do* blow up.
--WT boilers go "Whoooooshhh"; FT boilers go "BOOM". Either way
not good, but at least the WT boiler owners usually live to tell the
tale..
--
"Steamboat Ed" Haas : Heartily sick of
Hacking the Trailing Edge! : "oldies" stations!
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---

I missed the staff meeting but the minutes show steamer
wrote back on Mon, 31 Jan 2005 01:59:37 GMT in rec.crafts.metalworking :
Grant Erwin wrote:
: And everyone's point is that boilers *do* blow up.
--WT boilers go "Whoooooshhh"; FT boilers go "BOOM". Either way
not good, but at least the WT boiler owners usually live to tell the
tale..

WT? Water Temp? Warren Thomas? Who The...?

FT? Full Time? Foxtrot Tango? F'ing Tourists? ("F'ing Tourettes!"?)


--
pyotr filipivich.
as an explaination for the decline in the US's tech edge, James
Niccol wrote "It used to be that the USA was pretty good at
producing stuff teenaged boys could lose a finger or two playing with."

--WT = Water Tube
--FT = Fire Tube
--If you don't know the difference you shouldn't be messing with
anything bigger than a tea kettle! ;-)

--
"Steamboat Ed" Haas : Heartily sick of
Hacking the Trailing Edge! : "oldies" stations!
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---

Bob May wrote:

--
Why isn't there an Ozone Hole at the NORTH Pole?




Actually, there is:
http://news.bbc.co.uk/2/hi/science/nature/4217329.stm

I missed the staff meeting but the minutes show steamer
wrote back on Mon, 31 Jan 2005 18:37:19 GMT in rec.crafts.metalworking :
--WT = Water Tube
--FT = Fire Tube
--If you don't know the difference you shouldn't be messing with
anything bigger than a tea kettle! ;-)

Thanks.

Seeing as how I'm offering free advice (with a money back guarantee)
I'm not planning on messing with steam any time soon. :-)

tschus
pyotr


Hmmm, I wonder, if I can mill the setup from a forged block of
titanium?

--
pyotr filipivich.
as an explaination for the decline in the US's tech edge, James
Niccol wrote "It used to be that the USA was pretty good at
producing stuff teenaged boys could lose a finger or two playing with."