141–150 of 341 posts
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The stockpile is "tiny" so I guess it doesn't really matter unless they are running low on material.
Doesn't make sense to put the capital forward for a kiln if they don't need it!
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How does fiberglass stand to high heat?
I looked up g11 and g10 for their structural heat limits, because I know they have a higher heat resistance than most fiberglass, and are limited to around 150c/ 300f. I looked up what a typical house fire burns at which is 600c/1100f. This is actually a great case where asbestos shines. It's nonconductive and can stand very high temperatures. If not for the whole cancer thing.
The problem is the matrix, which softens under heat unless you use exotic things like ceramic matrix composites which are brittle.
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> a job where 95% of the time is spent waiting for an emergency to react to. this describes quite accurately the work of many people maintaining computer systems
I must be maintaining the wrong systems, because over here 95% of the time is reacting to emergencies (some technical, but most fabricated by management)
Nobody wanted to rip out the old problematic systems and start over. So I left. You should do the same. Plenty of jobs out there where you can grow and actually build high quality solutions.
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How does fiberglass stand to high heat?
I looked up g11 and g10 for their structural heat limits, because I know they have a higher heat resistance than most fiberglass, and are limited to around 150c/ 300f. I looked up what a typical house fire burns at which is 600c/1100f. This is actually a great case where asbestos shines. It's nonconductive and can stand very high temperatures. If not for the whole cancer thing.
Asbestos is heavy as rock.
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The San Franciso Fire Department is using wooden ladders due to an abundance of overhead power lines. Which I think is the core issue, use other peoples tools unless you have some critical and unique requirement.
I think the low yield strength of aluminum also plays a role here, as one guy mentions. But I’m surprised thermal conductivity didn’t rate a mention. There was a time when aluminum bikes were new but before the parts likely to bend were replaceable where many a bike owner had to buy a new frame due to misadventure. You can only bend aluminum once, then you’re done. When they started making cogsets with more than six…
https://renovobikes.com/pages/why-wood
They cost a pretty penny, such that I would be afraid of losing or damaging them.
I can't think of any reason to acclimatize them this way instead of kiln drying/vaporizing them (depending) to roughly the right moisture content and waiting for 1% change (instead of kiln drying them to 0, or waiting forever for completely green wood) There are studies going back to the 70's by the forestry service (and others) showing there is no change in mechanical properties of pine/fir from these drying schedul…
The material they show in the article is massive. Thick, long and heavy. Even if there are kilns big enough, the wood would no longer be straight after a fast kiln drying. A 50' 3x3" board would be twisted and bowed so much that the ladder would be a spiral staircase. It doesn't matter for 20' 2x4 destined for a construction site. Even if the wood was kiln dried, it would still have to acclimatizate for months or yea…
This is not true, depending on timeline. It's true of the production rate kilns, and as you say, it doesn't matter for construction lumber, which is why they do it.
But assuming 3+ years to dry your 3x3" board, even doing it in a kiln at a 6 month rate (or whatever) would be a vast improvement, and would basically not bow or check. Again, there is actually a vast amount of research on drying schedules vs defects and how to optimize for whatever you want for a given wood species.
As for kiln size, again, solar kilns are quite trivial to build for basically any size or shape, and can easily be temperature controlled for something like this. (and they could easily build a kiln in the space they have shown in that article)
To whit: I've built a solar kiln in maryland for 30+ ft boards before, and cost of materials was "Even if the wood was kiln dried, it would still have to acclimatizate for months or years before it would be at a stable 13% humidity of San Francisco."
Why? You can just stop drying it at 13% (instead of the 7-8% that is normal).
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The film industry uses almost exclusively fiberglass as well. There's no shortage. They're swimming in those things. I would bet their lifespan is shorter than the wooden ladders, however. At least from what I've seen.
Fiberglass is reinforced plastic, though, so that might explain why it isn't used in FDs even if it's heavily used in other domains. How well does it hold up to heat? How does that exposure effect it structural properties? I honestly don't know and don't have time to look it up, but I could see thermal plastic deformation over such a long run as potentially hazardous.
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First thing that came to my mind too! I've had two "Please call me, it's broke" calls just this morning!
Why does your manager know this before you do though?
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First thing that came to my mind too! I've had two "Please call me, it's broke" calls just this morning!
Why does your manager know this before you do though?
I get the same issue where I work. The client states that "everything is broken," but it often turns out that their own servers are down (or sometimes our API guys made a breaking change and I wasn't informed, but that's not common anymore). I find this stuff out when I get to work in the morning, because they certainly aren't calling me directly.