NIST recommended the kilogram for the quantity dispensed and megapascals
(as I recall) for the pressure of the system. I vaguely recall the two
choices were something like 33 MPa and 75 MPa, but don't quote me. I've
got my notes filed away but I don't have time to dig them out. If you
have more than a passing curiosity let me know and I'll fetch them up.
Jim
[EMAIL PROTECTED] wrote:
Jim,
Which metric units and prefixes were recommended by NIST?
Ezra
-------------- Original message ----------------------
From: James Frysinger <[EMAIL PROTECTED]>
I happened to be at Gaithersburg at the time (2008 April) and so was
fortunate to be able to sit in on a briefing that Lorelle Young, USMA's
President, was given by NIST on many matters. One of those was on the
dispensing of H2 in California, on which NIST had been consulted.
Lorelle and I thus had opportunity to comment on this as well as the
other matters. Three quantities are involved: system pressure, quantity,
and cost. The unit recommendations made by NIST were all metric, of
course. Apparently the current design is for two possible system
pressures; vehicles must be refueled from a facility that uses the same
pressure and there are thoughts of having the cars' GPS's automatically
indicate the nearest matching station.
Jim
Phil Chernack wrote:
As far as I can tell, hydrogen has always be dispensed by the kg. Even
the president made mention of it in a State of the Union address a few
years back. When fuel cell cars become more widespread, I can't see any
other unit being used to dispense hydrogen.
Phil
On Tue, Jul 1, 2008 at 12:45 AM, Victor Jockin <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
I've been doing some more digging on this issue, and I may have
jumped the gun when I said that California law requires the retail
dispensing of hydrogen fuel in kilograms. The "workshop" document I
distributed a link to, which summarizes major elements of the law,
has a bullet indicating that H2 is to be dispensed in kilograms.
But the law itself, while using only metric units throughout its
text (kilograms and metric tons) does not, as far as I can tell,
explicitly require retail dispensing in kilograms. What it does
require is that retailers report sales to the state in kilograms.
Also, certain trigger points (the definition of a low volume
retailer) are set in metric units. Here's the full bill that got
signed into law:
http://www.leginfo.ca.gov/pub/05-06/bill/sen/sb_1501-1550/sb_1505_bill_20060930_
chaptered.pdf
So a retailer who sold in pounds and reported sales to the state in
kilograms would not, as far as I can tell, be in violation of this
law. And of course, this law applies only in California.
This just underlines my point that we need to be on top of this
important emerging battlefront. There is still time to influence
the future now, and we were handed an early tenuous victory by the
CA legislature and some European oil companies. That lead could
very easily vanish (and in my opinion, probably will) with a
national retail build out of H2 stations. Someone within USMA needs
to research this issue and start crafting a national strategy that
will make the most of our limited resources and influence. I can
try to help, but who else does these kinds of things within our
organization? For example, what bills might be pending in other
states? Are any other potential H2 retailers planning stations?
Can NIST get involved (at least write opinions)? What can we do to
cheer on Shell and BP for dispensing in kg's now? etc.
--
James R. Frysinger
632 Stony Point Mountain Road
Doyle, TN 38559-3030
(H) 931.657.3107
(C) 931.212.0267
--
James R. Frysinger
632 Stony Point Mountain Road
Doyle, TN 38559-3030
(H) 931.657.3107
(C) 931.212.0267
