Subject: Re: Flow Control Valves
From: "S.Sitaram"
Date: Tue, 21 Jan 1997 20:26:12 -0600
HI,
I think you may use Cartridge valves of Sterling Hydraulics or SUN
Hydraulics.
S.Sitaram
On Tue, 21 Jan 1997, Brian Anderson wrote:
> Can anyone suggest a source for miniature flow control valves?
> Something similar to Lee "Flowserts", but with greater precision,
> hopefully. Nominal size: 1/4 inch dia, pressure to 3000 psi. Fluid
> flow is 0.13 gpm for one case, 0.50 gpm for another.
>
> TIA, Brian Anderson
> briander @ix.netcom.com
>
>
>
Subject: 1997 Federal Projects
From: A/E Business Review
Date: Tue, 21 Jan 1997 17:06:06 -0700
EARLY GOVERNMEMT PROJECT LEADS ON DISK!
The Environmental Project Outlook features over 5,500 Federally
funded environmental project leads for the Department of Defense
totaling almost $6 Billion. Federal environmental projects have always
been a consistent place to find work -- and this year is no different
despite some realignment of resources and priorities.
Federal Design Outlook includes Federal Government projects long
before they appear in the Commerce Business Daily. It contains billions
in new projects which range in size from $210 thousand to $300 million
in contruction costs. Child care centers, barracks, ship handling
facilities, port facilities, hospitals, schools, fire stations, hangars,
airfield aprons and taxiways, ammunition handling facilities, vehicle
mainenance facilities, roads, runways, and much more.
Both disks are sorted by state and are complete with colored maps, a
searchable data, and a complete listing of contact names, phone numbers
and addresses. The information comes from a variety of hard-to-find
Federal Budget Reports, which are then edited and geared specifically
towards the A/E/C industry. The disks are available free to members of
A/E&C; Info-Net, the on-line service for engineers, architects, and
contractors. Non-members may receive them by filling out the form
below.
-----------------------------------------------------------------------------
YES! Please rush me the following disks:
___ 1997 Environmental Projects ($125)
___ 1997 Federal Design Outlook ($125)
___ Check ___ Visa ___ Mastercard
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Make checks payable to A/E Business Review, P.O. Box 4808, Cave Creek AZ
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Subject: Re: Needless Loss of Eight Lives Working with High Pressure
From: Robert Davis
Date: Tue, 21 Jan 1997 20:48:39 -0800
Steven E. Bailey wrote:
>
> I have always found it interesting that I can easily obtain all sorts of
> information about air traffic accidents, whether they are small or large,
> private or commercial. Yet, serious accidnets such as this one in
> Houston are hidden in unavailable OSHA reports, or worse legal documents.
> I guess I wonder why OSHA, just like the FAA, does not produce a
> 'factual' report on such disasters and then make it publicly known so
> that other companies with similar facilities can make efforts to improve
> themselves. All this hiding cannot lead to tangeble safety improvements.
Many of the "factual" failure evaluations or RCA's (root cause analysis)
are part fact and part subjective; full of 'what if', 'it could be' and
'it is likely'... In many cases human performance issues (direct and
indirect) cloud reasoning. The actual reports are 100's of pages, full
of data and fractrographs, chemical certs, fabrication records .... I
and others have perfored FA's and RCA's which involve several hundred
man hours. This is needed to fully understand the conditions and
problems that existed at the time of the event.
The "back seat" failure evaluations accomplish little good, and can do
much more harm to families and companies. Our natural habbit (like the
press) is to boil it down to a paragraph, which is not right. We all
know that second party conclusions, based on little information, aren't
likely to be as accurate or placed in the right "light".
You should not think that nothing becomes of the failure, especially
when it goes "legal". History has demonstrated great engineering sucess
in this regard. Yes, there are some bad ones, but usually the bad ones
are "infected" throughout the organization. Corporations which are not
efficient and risk product quality, personal, finance, environmental
responsibility, and pressure vessel integrity will be put out of
business.
By the way, look into the State Boiler Inspectors meeting minutes for
more specific details of the event. Please, put the time into the
discovery process before you reach your conclusion.
Side note, did you know that more than 50,000 died per year in boiler
explosions prior to the 1930's and the ASME code.
Subject: Re: Wind Pressure
From: Gerhard Bosch
Date: 22 Jan 1997 08:08:50 GMT
T Dubya squezzed out of his keyboard:
TD: Can someone tell me how to calculate wind pressure on a surface? I have
TD: looked in several references without any luck. Thanks.
Hi, this depends very much on the flow situation. E.G. for a
stagnation flow the pressure is: p = 0.5 * rho * u^2. If the
flow is parallel to the surface, there is just the static
pressure acting. Just take any basic fluid mechanics book
and try to read it and this is probably enough information for
you.
// EOJ Mit freundlichen Gruessen, Gerhard Bosch
----------------------------------------------------------------
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voice: (33) 40 37 16 00, ext. 26 31; FAX: (33) 40 74 74 06
email: bosch@ec-nantes.fr; check listserv@rz.uni-karlsruhe.de and
sub: mz-ges-l: sidecars - old motorcycles - anything interesting
http: //ifh-hp6.bau-verm.uni-karlsruhe.de/Bosch/index.html
----------------------------------------------------------------
Subject: High Speed Portable Data Recorders??
From: afrankli@mines.edu (Aaron Franklin)
Date: 23 Jan 1997 20:14:05 GMT
I want to test handlebar design on mountain bikes by measuring strain
guages while in the field. This means I need a data recorder that can
sample several guages at about 500 Hz ideally. It would also have to be
light enough and portable to pack on one's back, durable to survive the
shock of going down a mtn biking trail, and capable of recording ~4 guages
@ 500 Hz for ~5 minutes. Am I asking the impossible?? I have looked
around but everything seems to be geared for long term sampling, the
fastest that I've found is 16 HZ.
Am also looking at packing a laptop on my back and taking it on the
trails, but am worried about skipping on the hard drive.
Would appreciate any suggestions or experiences with this sort of
thing. I'm a senior in mechanical engineering at the Colorado School of
Mines and this is for a design class. As such, we have a limited budget
<$1000 for purchasing or renting the equipment.
Please e-mail any suggestions to me at afrankli@mines.edu.
Still Searching,
Aaron Franklin
Subject: Re: 6-axis accelerometers
From: "Steven E. Bailey"
Date: 22 Jan 1997 13:12:24 GMT
I have generally found the situation to be as you have described. But I
too believe this is only an act oc convention. Recently, however I was
working on a problem dealing with aircraft model movement and because of
the set up of the machine and the oreintation of the model the pitch and
yaw were reversed. The particular machine was programmed from a machine
orientaiton and not a model oreination. I really crossed me up. SO I
guess I'd say watch closely the situation you're dealing
with.jhaney@dynacon.com (jdhaney) wrote:
>On a 6-axis accelerometer, are the x,y,z,roll,pitch,yaw
>axis always the same orientation with respect to each other?
>(my assumptions: right hand coordinate system for x,y,z;
>roll cw around x-axis, pitch cw around y axis,
>yaw cw around z axis.)
>
>i have data from an accelerometer on a ship, with a note
>saying which way the x,y,z axis are oriented. i need to know
>if i can then assume which rotations the roll,pitch and yaw
>data are really measuring. or are the roll, pitch, and yaw
>subjective to the specific setup?
>
>jdh
>jhaney@dynacon.com
>
Subject: High Speed Portable Data Recorders??
From: afrankli@mines.edu (Aaron Franklin)
Date: 24 Jan 1997 00:50:38 GMT
I want to test handlebar design on mountain bikes by measuring strain
guages while in the field. This means I need a data recorder that can
sample several guages at about 500 Hz ideally. It would also have to be
light enough and portable to pack on one's back, durable to survive the
shock of going down a mtn biking trail, and capable of recording ~4 guages
@ 500 Hz for ~5 minutes. Am I asking the impossible?? I have looked
around but everything seems to be geared for long term sampling, the
fastest that I've found is 16 HZ.
Am also looking at packing a laptop on my back and taking it on the
trails, but am worried about skipping on the hard drive.
Would appreciate any suggestions or experiences with this sort of
thing. I'm a senior in mechanical engineering at the Colorado School of
Mines and this is for a design class. As such, we have a limited budget
<$1000 for purchasing or renting.
Please e-mail me at afrankli@mines.edu.
Still Searching,
Aaron Franklin
Subject: sci.engr.* FAQ on Engineers and Ethics: Introduction
From: rongraham1@aol.com (RonGraham1)
Date: 22 Jan 1997 16:21:21 GMT
This is a first draft of the Introduction to the next FAQ:
on Engineers and Ethics. This I wrote myself, so I expect
comments (and criticism). We'll get off another section for
review afterwards.
**********
ETHICS: Introduction
Here is the IEEE Code of Ethics: its members agree
( 1) to accept responsibility in making engineering decisions
consistent with the safety, health, and welfare of the
public, and to promptly disclose factors that might endanger
the public or the environment
( 2) to avoid real or perceived conflicts of interest whenever
possible, and to disclose them to affected parties when they
exist
( 3) to be honest and realistic in stating claims or estimates
based on available data
( 4) to reject bribery in all its forms
( 5) to improve the understanding of technology, its appropriate
application, and its potential consequences
( 6) to maintain and improve our technical competence and to
undertake technological tasks for others only if qualified
by training or experience, or after full disclosure of
pertinent limitations
( 7) to seek, accept, and offer honest criticism of technical
work, to acknowledge and correct errors, and to credit
properly the contributions of others
( 8) to treat fairly all persons regardless of such factors as
race, religion, gender, disability, age, or national origin
( 9) to avoid injuring others, their property, reputation, or
employment by false and malicious action
(10) to assist colleagues and co-workers in their professional
development and to support them in following this code of
ethics
Common threads in the IEEE code: honesty, fairness, benevolence,
and competence. Problems in the code include basis for judgment.
Competence can be measured to some extent. What is the measure
of honesty, fairness, and benevolence?
One of the fundamental problems of ethics in general is that they
have no common source. And it's not appropriate for engineers to
set the source from which ethics come -- there are philosophers,
theologians, cultural anthropologists, and ethics specialists for
that. But consider a very brief comparison of ethics defined for
major world views by Sire (1988):
o Christian Theism: based on the (assumed good) character of
God
o Deism: the universe reveals what is right
o Naturalism: ethics relate only to human beings, as they are
the only creatures with personality and individuality
o Nihilism: one acts anyway, despite the lack of meaning in
the universe, on the basis of "the way things ought to be"
o Existentialism: part of individuality is "creating value"
with our lives
o Pantheistic Monism: to become one with the universe is to
pass beyond personality
o New Age: to become one with the universe is to pass beyond
"morality"
No comment is given on the "correctness" of any of these world
views, or on their prevalence, or whether any others have been
left out. The point is that ethical views have various sources,
and none governs over the others.
How does the engineer choose? The closest model I can come up
with the a "statistical" model: if you were designing a building
to resist wind loads, you would choose a design load based more
or less on how long you want the building to last before
replacement. You say, for instance, that the building is to last
20 years. To be reasonably certain that it won't be blown over
in the interim, you choose as your design load the maximum wind
speed and duration recorded in the region in the last, say, 50
years. (There would be an analogous model for earthquake
resistance design.)
In the same way, you choose an ethical view on the basis of what
"most of the people" view as ethical. (Whether you define "most
of the people" as "most of society" or "most of your customers"
may be another subject.) The more people you examine, the more
likely feelings on any given issue are to fall within a normal
distribution. You get the distribution, and you choose the
amount of variation you want to stay within. The only real
differences between ethical design and earthquake design then
become
(1) You won't take a survey or research the data on ethics:
you'll just guess.
(2) You'll probably have to take account of *both sides* of the
distribution in the ethics case, since "evil" may come in
pairs of opposites (e.g. overdesign is too expensive and
underdesign is too risky), while in the case of earthquake
design, you design for too much load and ignore too little.
**********
Dr. Ron Graham
Project Engineer for Robotics, GreyPilgrim LLC, Washington DC
founder of Usenet newsgroup sci.engr and editor of its FAQs
EMMA Robotic Manipulator online -- http://www.greypilgrim.com/
"Reengineering was invented by Dr. Jonas Salk as a cure
for quality programs."
-- Scott Adams, in _The Dilbert Principle_
Subject: Re: Circles
From: Soren LaForce
Date: 22 Jan 1997 18:11:08 GMT
In article <32E39932.30E1@tuelectric.com> Daniel Alcorn,
dalcorn1@tuelectric.com writes:
In article <32E39932.30E1@tuelectric.com> Daniel Alcorn,
dalcorn1@tuelectric.com writes:
> Can anyone tell me why a circle is divided into 360 degrees? Why not
400
> or any other number of divisions? Thanks, Daniel Alcorn.
can only speculate (and have in the past), however...
360 is divisible by 1,2,3,4,5,6,8,9,10,12, and a host of others.
--Soren
-my opinions-
Subject: Re: Circles
From: Robert Price
Date: Wed, 22 Jan 1997 16:26:05 +0000
George Jefferson wrote:
>
> :Can anyone tell me why a circle is divided into 360 degrees? Why not 400
> :or any other number of divisions? Thanks, Daniel Alcorn.
>
> Its a pretty good bet it comes from celestial calculations.
> Approximatly 360 days / year, plus it divides neatly by 24.
>
> Now, why are there 24 hours in a day?
>
> Incidentally, there happens to be a unit called a "grad" that is
> 1/400 of a circle. Its an option on my HP, though I've never
> seen it used anywhere.
What about radians.
There are 2*PI radians in a circle, a much more sensible unit.
Subject: FCCU Expander valves
From: mussel@mbox.vol.it (Riccardo Cozza)
Date: Wed, 22 Jan 1997 20:18:15 GMT
Cagliari , 22.01.1997
In the FCCU flue gas line there is, in the following order, the 3th
stage, the control valve, the shut-off valve and an expander.
The expander is connected with an alternator.
The shut-off valve is near the expander and before there is the
control valve (3th stage->control->shut-off->expander).
Is it all right if I exchange the position valve ?? (3th
stage->shut-off->control->expander)
I think that I can have only some fluidodynamic problems if I put the
control valve too near the expander but I should improve the tightness
of the two valves.
Could someone tell me other potential problems??
Thank you very much for every replay.
Best Regards,
Riccardo Cozza
mussel@mbox.vol.it
