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Japan hit by 8.9 Magnitude Quake, Tsunami Warnings In Effect
- Thread starter Terrierbyassociation
- Start date
Kepler
Cornell Big Red
Re: Japan hit by 8.9 Magnitude Quake, Tsunami Warnings In Effect
There was no tsunami, thank the arbitrary deity and/or disembodied tree spirit or snarky internet meme of your choice.
There was no tsunami, thank the arbitrary deity and/or disembodied tree spirit or snarky internet meme of your choice.
P
Priceless
Guest
Re: Japan hit by 8.9 Magnitude Quake, Tsunami Warnings In Effect
The Flying Spaghetti Monster saved them.
The Flying Spaghetti Monster saved them.
Kepler
Cornell Big Red
Re: Japan hit by 8.9 Magnitude Quake, Tsunami Warnings In Effect
With His Noodly Appendage.
With His Noodly Appendage.
huskyfan
New member
Re: Japan hit by 8.9 Magnitude Quake, Tsunami Warnings In Effect
I know I know the link :
http://www3.nhk.or.jp/daily/english/12_05.html
I know I know the link :
http://www3.nhk.or.jp/daily/english/12_05.html
Patman
Rodent of Unusual Size
Re: Japan hit by 8.9 Magnitude Quake, Tsunami Warnings In Effect
please... please... please don't go into science
---
I had a person, who should know better, argue that the US west coast was due based on some awkward corner theory... he then berated me because technically he's published... yeah... except that plates don't work like that... 9.0 isn't necessarily going to affect down a non-localized chain and further faults, and I could be wrong here, tend to react to each other along the lines themselves. More to the point, earth quakes are breakings of the rocks far below the surface... tons of stress... were it that inevitable then it would just go as the stress is loaded on after the 9.0 quake in Japan... afterall... as the argument goes, all the other table legs have kicked out.
If it were that easy then come and pick up your Nobel.
Now here... I could see a new stress being "the one that broke the camel's back"... we're probably getting quakes because new stress is loaded upon areas where it then passes criticality and you get a break... such is life. But again... getting one quake does not mean that a larger one will naturally follow in a near time frame.
please... please... please don't go into science
---
I had a person, who should know better, argue that the US west coast was due based on some awkward corner theory... he then berated me because technically he's published... yeah... except that plates don't work like that... 9.0 isn't necessarily going to affect down a non-localized chain and further faults, and I could be wrong here, tend to react to each other along the lines themselves. More to the point, earth quakes are breakings of the rocks far below the surface... tons of stress... were it that inevitable then it would just go as the stress is loaded on after the 9.0 quake in Japan... afterall... as the argument goes, all the other table legs have kicked out.
If it were that easy then come and pick up your Nobel.
Now here... I could see a new stress being "the one that broke the camel's back"... we're probably getting quakes because new stress is loaded upon areas where it then passes criticality and you get a break... such is life. But again... getting one quake does not mean that a larger one will naturally follow in a near time frame.
Last edited:
Re: Japan hit by 8.9 Magnitude Quake, Tsunami Warnings In Effect
Sorry about the REALLY late reply, but I finally had my memory jogged at the right time (touring the Leser relief valve plant in Germany
) and asked about bellows valves and HF.
The issue with balanced bellows relief valves and HF is this: in order for the bellows to work properly, the bonnet has to be open to atmospheric pressure. In the event that the bellows fail (which does happen), in the absence of any sort of secondary containment around the bonnet of the valve, HF will be released.
I'm not sure what the preferred way of handling this is. Maybe some sort of secondary containment around the valve bonnet, though that would still potentially incur the backpressure issues that the bellows valve was presumably used to address in the first place. Maybe a pilot-operated valve, I'm not sure whether there would be reliability/fouling concerns in HF-related service. It seems to me that you could ask valve vendors about this sort of thing... HF alky units are AFAIK common in refineries, so they should have a significant number of valves in that sort of service.
Let me know what you hear aobut bellows and containment. I feel like that's something to pay attention to when we're talking about HF.
It's not an issue so much as everything has to be carefully designed since we have to "derate" the enclosed tank. We have a preliminary blowdown tank relief set point at 100 psig (being fed by a couple 150 psig and one 300 psig vessel). When you do are trying to depressurize the vapors, it matters with regards to how large the blowdown tank is. It's not like it's a huge deal, but it requires extra attention.
Sorry about the REALLY late reply, but I finally had my memory jogged at the right time (touring the Leser relief valve plant in Germany
) and asked about bellows valves and HF.The issue with balanced bellows relief valves and HF is this: in order for the bellows to work properly, the bonnet has to be open to atmospheric pressure. In the event that the bellows fail (which does happen), in the absence of any sort of secondary containment around the bonnet of the valve, HF will be released.
I'm not sure what the preferred way of handling this is. Maybe some sort of secondary containment around the valve bonnet, though that would still potentially incur the backpressure issues that the bellows valve was presumably used to address in the first place. Maybe a pilot-operated valve, I'm not sure whether there would be reliability/fouling concerns in HF-related service. It seems to me that you could ask valve vendors about this sort of thing... HF alky units are AFAIK common in refineries, so they should have a significant number of valves in that sort of service.