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Posted by ED on June 30, 2008, 9:31 am
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I read the postings here regularly and have a few
welding/fabrication questions.
I'm installing a wood fired boiler in my home and
need a hot water storage tank. Something around
500 gal and sized for entry through a standard doorway.
That precludes a propane or other such type tank.
It has occured to me that maybe the local welding shop
could fabricate such a tank but I am aware that there
are issues with a rectangular pressue tank even though
is operates at a low pressure of 10-12 psi's.
Would it be adviseabel to try such a thing? 12 ga 5'x6'x2.5'
in size mild steel. Bent corners, flat ends, closely spaced
internal baffles/exterior bracing?
Hydro test to 1.5 operating pressure.
Any thoughts appreciated. ED
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Posted by Ecnerwal on June 30, 2008, 9:46 am
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> Any thoughts appreciated. ED
Practically speaking, you'll do better to build an insulated box that
will hold multiple prefabricated round pressure vessels that add up to
your desired volume - or do what most of the commercial installs do -
have an un-pressurized insulated hot water tank with a pressurized heat
exchange coil or coils.
Rectangular is a lousy shape, and results in a lot of extra work - and
finding a weldor qualified to work on pressure vessels is often a bit of
a search, and costly when completed. I have such a pressure vessel,
which I unfortunately only intercepted when the outer shell (it's a wood
fired water boiler) was partly cut off by the folks getting rid of it
(since they had set it up with no heat storage, it never quite worked
right, so they were getting rid of it, and wanted to lighten the lift
out - I would have happily hired riggers to get it whole, but too late).
It has an array of straps tying the flat sides together every few inches
(and is a mere 15 lb vessel, as you intend). Would be a lot of welding -
I'm just thinking to reuse the firebox in some non-pressurized or
non-water (sand, perhaps) setting.
--
Cats, coffee, chocolate...vices to live by
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Posted by ED on June 30, 2008, 10:15 am
Please log in for more thread options On Mon, 30 Jun 2008 13:46:03 GMT, Ecnerwal
>> Any thoughts appreciated. ED
>
>Practically speaking, you'll do better to build an insulated box that
>will hold multiple prefabricated round pressure vessels that add up to
>your desired volume - or do what most of the commercial installs do -
>have an un-pressurized insulated hot water tank with a pressurized heat
>exchange coil or coils.
>
>Rectangular is a lousy shape, and results in a lot of extra work - and
>finding a weldor qualified to work on pressure vessels is often a bit of
>a search, and costly when completed. I have such a pressure vessel,
>which I unfortunately only intercepted when the outer shell (it's a wood
>fired water boiler) was partly cut off by the folks getting rid of it
>(since they had set it up with no heat storage, it never quite worked
>right, so they were getting rid of it, and wanted to lighten the lift
>out - I would have happily hired riggers to get it whole, but too late).
>
>It has an array of straps tying the flat sides together every few inches
>(and is a mere 15 lb vessel, as you intend). Would be a lot of welding -
>I'm just thinking to reuse the firebox in some non-pressurized or
>non-water (sand, perhaps) setting.
Thanks, I was afraid that, i knew there had to be valid reason for
not seeing anything like that commonly used.
Automotive radiators are a rectangular
pressure vessel, and I know that on off shore rigs where space
is at a premium they are used..
I have a 500 gal propane tank but would have to build something to
hold it and then run lines ect. Where does the pressure tank have
to be installed in relation to the storage tank? Tkns ED
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Posted by MaxweII on June 30, 2008, 10:52 am
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>
>
> I read the postings here regularly and have a few
> welding/fabrication questions.
>
> I'm installing a wood fired boiler in my home and
> need a hot water storage tank. Something around
> 500 gal and sized for entry through a standard doorway.
> That precludes a propane or other such type tank.
>
> It has occured to me that maybe the local welding shop
> could fabricate such a tank but I am aware that there
> are issues with a rectangular pressue tank even though
> is operates at a low pressure of 10-12 psi's.
>
> Would it be adviseabel to try such a thing? 12 ga 5'x6'x2.5'
> in size mild steel. Bent corners, flat ends, closely spaced
> internal baffles/exterior bracing?
>
> Hydro test to 1.5 operating pressure.
>
> Any thoughts appreciated. ED
What is the operating pressure, maybe 100 psi?
If you go rectangular, you could do something like 3/8 or 1/2 tie rods on
about 12" centers to greatly reduce the required plate thickness. But a 500
gallon "box" that operates at normal water pressures is going to require the
involvement of a good engineer to be safe.
Another possibility might be using something like a bundle of up to 6" pipe.
Unless ASME has changed, since the last time I looked (about 30 years ago),
vessels less than 6" in diameter, or I think less than 5 psi are exempt.
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Posted by Ignoramus5615 on June 30, 2008, 10:56 am
Please log in for more thread options >
>>
>>
>> I read the postings here regularly and have a few
>> welding/fabrication questions.
>>
>> I'm installing a wood fired boiler in my home and
>> need a hot water storage tank. Something around
>> 500 gal and sized for entry through a standard doorway.
>> That precludes a propane or other such type tank.
>>
>> It has occured to me that maybe the local welding shop
>> could fabricate such a tank but I am aware that there
>> are issues with a rectangular pressue tank even though
>> is operates at a low pressure of 10-12 psi's.
>>
>> Would it be adviseabel to try such a thing? 12 ga 5'x6'x2.5'
>> in size mild steel. Bent corners, flat ends, closely spaced
>> internal baffles/exterior bracing?
>>
>> Hydro test to 1.5 operating pressure.
>>
>> Any thoughts appreciated. ED
>
> What is the operating pressure, maybe 100 psi?
He said 10-12 PSI.
> If you go rectangular, you could do something like 3/8 or 1/2 tie rods on
> about 12" centers to greatly reduce the required plate thickness. But a 500
> gallon "box" that operates at normal water pressures is going to require the
> involvement of a good engineer to be safe.
>
> Another possibility might be using something like a bundle of up to 6" pipe.
> Unless ASME has changed, since the last time I looked (about 30 years ago),
> vessels less than 6" in diameter, or I think less than 5 psi are exempt.
>
>
--
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to spammers, I and many others block all articles originating
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http://improve-usenet.org/
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