Nevertheless, 29,000 PSI at 700 F is pretty serious so at the very least they
should have exercised due diligence and paid attention to the recommendations of
the subject matter experts. They didn't and it bit them pretty seriously.
On 11/24/2013 10:45 PM, Bob Camp wrote:
Hi
They’ve been doing it for over 50 years. The early vessels were surplus from
the Navy. They no longer needed as many of them to mount in turrets on
battleships and heavy cursers …
Bob
On Nov 24, 2013, at 9:23 PM, Bill Dailey <[email protected]> wrote:
I have operated nuclear plants... I would rather sleep 40 feet from a
nuclear plant rather than 1000 feet from a 30,000 pound pressure vessel.
The pressure vessel has a much higher likelihood of releasing tremendous
potential energy.
I am not talking about wilderness... but less than 1000 feet from a
truckstop and freeway.. really. Huge pressure vessels?
Bill
On Sun, Nov 24, 2013 at 8:15 PM, Bob Camp <[email protected]> wrote:
Hi
Well, let’s see, nearest operational facility is about 6 miles away down
in the middle of town over by the High School. It’s been there since the
1950’s. There used to be a few more around here, since shut down.
Bob
On Nov 24, 2013, at 8:10 PM, Bill Dailey <[email protected]> wrote:
I am a chemical engineer and am quite frankly appalled that this kind of
high pressure process would be done in such proximity to innocents.
On Sun, Nov 24, 2013 at 6:53 PM, Bob Camp <[email protected]> wrote:
Hi
NDK has multiple plants growing quartz around the world. They also have
a
number of competitors in that business. There are better places than
NDK to
buy high end bars.
Bob
On Nov 24, 2013, at 7:00 PM, Bill Hawkins <[email protected]> wrote:
This is not as far from time-nutty things as it might appear.
NDK makes precision crystal oscillators from those crystals. One of
them
is an OCXO less than an inch (20 mm) square and half that high with
stability of 3x10E-9 over the range of -40 to 85 C. Annual drift is
typically 50x10E-9. The data sheet is at:
http://www.ndk.com/en/news/2013/1190702_1616.pdf
The CSB released an impressive video of the incident last month. It is
in the final report at:
http://www.csb.gov/ndk-crystal-inc-explosion-with-offsite-fatality-/
The financial forecast for NDK shows 50 to 60% drop in profits for the
same sales in 2013. If that was also true in 2009, management was
motivated to maximize production with what they had. The original
consultant strongly recommended inspections for stress corrosion
cracking, but strong recommendations do not have financial penalties.
It
has become obvious that money is the only thing that matters at the
management level these days.
Oh, and don't bother trying to Google for "pure quartz crystals" to
find
out whether the cost went up in 2010 after one of the two manufacturers
in the US was shut down. The people whose magical thinking extends to
crystals want purity, so all crystals are "pure."
Help prevent incomplete knowledge.
Bill Hawkins
-----Original Message-----
From: Robert Atkinson
Sent: Sunday, November 24, 2013 1:43 AM
The US Chemical Safety Board have released their report into the 2009
accident at NDK's synthetic crystal growing facility in Belvidere IL <
http://www.csb.gov/assets/1/19/CSB_CaseStudy_NDK_1107_500PM.pdf > It
also describes the process.
Basically a 50ft autoclave failed, killing a member of the public at a
rest stop 650ft away. Looks like management decisions, probably based
on
cost, overriding engineering advice even following an earlier minor
incident. The letters from a consulting engineer in the annex make
interesting reading. It illustrates the importance of those
professional
engineers amongst us notifying and recording any safety issues we
discover. The facility is still shut down and the insurance company
won't settle as NDK were told of possible issues.
Robert G8RPI.
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Doc
Bill Dailey
KXØO
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Doc
Bill Dailey
KXØO
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