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How Safe Is Safe Enough?

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Totally_Lost
User Rank
Silver
Re: One other thing that the rulemakers should consider
Totally_Lost   5/14/2013 2:19:46 AM
NO RATINGS
WilliamK writes: "And air pollution comes from many sources and getting rid of all of them will reduce our standard of living to staying in caves and eating rocks. OK, that is an exageration, I know, but I am also aware that there are a whole lot of people, some who are actially well meaning, who want to force us into some utopian realm by taking away most of our freedoms, which include driving away from them in our carbon-based fueld automobiles."

Funny, when I do the math, removing 3.2M deaths and many times that illnesses/injuries from fossil fuel pollution, frees up about $3T to be added back into the global economy to improve the quality of life on this planet ... which is almost enough to pay the entire cost of needed high temp reactors.


If we simply stop producing gasoline/diesel cars/trucks, then other than a small number of collectors vehicles, everything else can be phased out to H2/EV hybrids in two decades or so by natural attrition. Providing H2 conversion kits at a low subsidized cost, will entice even a significant number of car collectors to upgrade, just so they can drive them everyday, without having to find gasoline/diesel which will start to get scarce/expensive with lower volume use.


I don't see any reason to come knocking at your door, asking for your car keys.


That kind of rhetoric is probably FUD.


windhorn
User Rank
Iron
Re: One other thing that the rulemakers should consider
windhorn   5/16/2013 3:08:05 PM
NO RATINGS
WilliamK wrote:

"...an FMEA for the complete plant would probably take a team of engineers less than a week..."

An FMEA for ONE component of ONE genset takes six engineers about two months (one man-year) and 40 pages.  Multiply that by the number of parts in the building.

Regards,

Allen

William K.
User Rank
Platinum
Re: One other thing that the rulemakers should consider
William K.   5/17/2013 8:22:10 PM
NO RATINGS
Windhorn, Six months for an FMEA on one component? Either they are: a.) evaluating it on a molecular level, or b.) doing it part time with a weekly FMEA committee meeting, or c.) Milking the project most strenuously. I can see that there could be 40 pages of report, but it is unomaginable that the FMEA could take that long, if the team understood the product beuing evaluated. If it was a team of "avaerage" engineers that had never seen the product previously and had never worked to gether before then it might take a lot more time. But why in the whole world would a team be selected for an FMEA that did not understand the product intimately. OUr team that worked so (apparently rapidly) knew and understood every aspect of the product completely, prior to our first time spent on doing the FMEA. There is no other raional way to approach such an important project.

RegularJoe70
User Rank
Iron
Re: One other thing that the rulemakers should consider
RegularJoe70   7/1/2013 9:48:53 AM
NO RATINGS
A couple weeks ago, I read an article from another trade rag (link here: http://www.deskeng.com/articles/aabkes.htm ) about the military experimenting with hydrogen fuel cells for automotive use.

The article says that the prototype vehicles carry about 5kg H2 at 10,000 psi.  Assuming the tank is at a balmy 80F, that hydrogen occupies about 24gallons (basic PV = nRT calc).  The article also says that a kg of H2 is roughly equivalent to a gallon of gasoline, so that's about 5 times the volume of ordinary, liquid, atmospheric pressure gasoline, just for fuel.

And that's just the hydrogen.  What about the pressure vessel? And all of the ultra-high pressure lines and pressure regulation and risk of sitting on a bomb?

It's cool that we're experimenting with this technology but I can't see it being anything but a niche application for a long time to come.  Petroleum prices have to get redonkulously expensive before this tech becomes even remotely attractive for a common user.

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