[TheForge] request for reviewers

Thu Nov 14 21:51:45 2002

Terry,
What spreadsheet program are you using?  How large is the file?  Do you =
show the equations in standard math notation or only in spreadsheet =
notation?
Bruce
NJ

>>> [email protected] 11/14/02 02:20PM >>>
hello;

i tried to send this last night but qth.net was acting up. hopefully,
this will not show up twice.

after several attempts i have a working spreadsheet which calculates the
following:

maximum btu/hr withdraw rate for propane cylinders and tanks.
the number of cylinders (of the same size) to manifold together to avoid
cylinder freeze ups.
btu/hr for orifices from 0.0080 thru 0.0120 and numbered drill sizes 80
thru 18 for the following pressures 5psig, 10psig, 15psig, 20psig, and
25psig. for orifice calculations i am using orifice efficiency coefficients=

of 0.7930 and 0.90. (which one is used depends on the inlet pressure.)

i would like some volunteers to review my math and the calculations
before i release it for use. i do need to write up some notes on the
math and calculations for the reviewers.

i still need to write up instructions for using it and clean up the
spreadsheet somewhat, but lord willing it should be ready by next week
friday.

the spreadsheet is written using openoffice calc.
i have exported it as an excel spreadsheet successfully.
i would like a variety of spreadsheet programs to try the spreadsheet so
i am able to find any quirks.

i am also working on a separate spreadsheet to calculate the size of the
vaporizor needed to vaporize liquid propane to a btu/hr gas rate without
the vaporizor freezing up. this is for those who are looking at liquid
withdraw from a cylinder or tank. there are advantages to using liquid
withdraw as long as the necessary safety measures are followed to the
letter. besides the possible hazard of being frost bitten by the liquid
propane a liquid propane spill will expand to 270 times the volumn of
liquid spilled to vapor/gas volumn. propane is heavier than air so it
would flow across the ground looking for the lowest spot and possibly
reach a source of ignition.

--=20
Terry L. Ridder ><>

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