Roy Butler
Sent: Tuesday, November 11, 2008 11:15 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Pt valves as overheat control
Hi guys,
I have been using the SS water loop in my Amish wood cookstove
for my domestic hot water for 9 years now. My tank is a 40 gallon
electric water heater (space
CTED]
www.holteksolar.com
- Original Message -
From: jay peltz
To: RE-wrenches
Sent: Tuesday, November 11, 2008 9:24 PM
Subject: Re: [RE-wrenches] Pt valves as overheat control
Hi Drake,
I don't know if you ever watch Myth Busters, but google them and check
out the water
: Re: [RE-wrenches] Pt valves as overheat control
Hi Chris,
Here is the mythbusters video.
http://www.youtube.com/watch?v=JmJoyuUJj2Q
jay
peltz power
On Nov 12, 2008, at 8:00 AM, Chris Meier wrote:
> Please do not forget any safety device in HVAC or plumbing is
> not designed to cycl
Hi Chris,
Here is the mythbusters video.
http://www.youtube.com/watch?v=JmJoyuUJj2Q
jay
peltz power
On Nov 12, 2008, at 8:00 AM, Chris Meier wrote:
Please do not forget any safety device in HVAC or plumbing is
not designed to cycle open and close as a controller. They are
designed
t
-wrenches
Subject: Re: [RE-wrenches] Pt valves as overheat control
Hi Drake,
I don't know if you ever watch Myth Busters, but google them and check
out the water tank they exploded.
Short version is they took a standard 40 gallon electric tank, put
into a small building, no PT valve, h
That makes total sense to me! Pressurized steam has the power to
pull a freight train over the Rocky Mountains. It is a force to be
reckoned with.
Drake
At 08:24 PM 11/11/2008, you wrote:
Hi Drake,
I don't know if you ever watch Myth Busters, but google them and check
out the water tank t
remember that any closed system should have an adequately sized
expansion tank. if you're circulating potable water thru, you'll want
one rated for potable, not the standard hydroninc one. then, the PT
valve is truely only a backup anyway, in the event of a bladder failure
or some other fail
Hi Drake,
I don't know if you ever watch Myth Busters, but google them and check
out the water tank they exploded.
Short version is they took a standard 40 gallon electric tank, put
into a small building, no PT valve, heated it until it exploded.
It flew something like 200' into the air, ju
Hey Folks,
When I installed SS heat exchangers in wood stoves a while back, I
always made sure to have 2 PT valves in the system for redundancy in
case one stuck or underperformed. Steam explosions are simply no fun.
We'd locate one right on the woodstove outlet and another at the
first ben
At 09:15 AM 11/11/2008, you wrote:
My questionis there a more robust version of that P/T valve
that I should be using? Something that you would use in a boiler perhaps?
I'm not really a hot water guy either, but I'm scheming on putting in
solar hot water with a wood stove backup loop. I
My pleasure - but I also wondered if you might not have a thermal
expansion tank in your system? Perhaps you could also try one of the
Watts Valve commercial valves like the LL40XL. As I recall, these valves
have another type of seat that isn't as prone to gumming up like the
regular residentia
Title: Todd Cory
Matt,
Good suggestion.real hard water here. My water coil needs cleaning
twice each heating seasona royal PITA.
In addition to the weeping, the P/T valves also start leaking around
the valve post too,
so I figure I'm better off replacing it anyway.
Thanks!
Roy Butle
Hey Roy,
T&P valves leak after X amount of time in direct proportion to the
mineral content of your water supply. Minerals are deposited on the seat
surfaces and prevent complete closure. My hunch is that installations in
areas with very low mineral saturation of the water source will have
mu
I've seen Tarm Boilers set up to thermosyphon to 30-40 feet of fin tube
in the event of a power outage. there's a normally open zone valve
(caleffi makes a wide variety of actuators for their zone valves,
including 3 way zone valves, but no DC actuators) that will allow
thermosyphoning when the pow
Title: Todd Cory
Hi guys,
I have been using the SS water loop in my Amish wood cookstove
for my domestic hot water for 9 years now. My tank is a 40 gallon
electric water heater (space saver unit) and is configured for thermo
siphon operation.
The P/T valve is all I have for protection and I
Title: Todd Cory
Sure, but the discussion was about
preventing hot water storage tanks from exploding. Putting BTUs into a
tank, whether that be from a wood stove loop or 5 kW electric heating
element is not the issue. Relying on a P/T valve to regulate
overheating is of course not a good idea
Todd,
I’m afraid that any PT valves that I’ve ever known have continued to weep
indefinitely after one or two overheat triggers.
I would not recommend relying on them for heat control devices.
Conrad
Cotuit Solar
NABCEP thermal cert.
_
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTE
17 matches
Mail list logo
