[amsat-bb] Re: Rocket Science

[Koss-1 Roger <Roger.Koss-1@xxxxxxxxxxxxxxxxxx>]

Keith:
 >From the Shuttle Reference Manual, which can be found at the KSC Homepage ,
http://www.ksc.nasa.gov:

      There are 64 ac-motor-operated valves in the OMS/RCS nitrogen tetroxide
and monomethyl hydrazine propellant systems. Each of these valves was
      modified to incorporate a 0.25-inch-diameter stainless steel sniff line
from           each valve     actuator to the mold line of the orbiter. The
sniff line from      each valve actuator permits the monitoring of nitrogen
tetroxide
      or monomethyl hydrazine in the electrical portion of each valve
actuator     during ground operations.

      The sniff lines from each of the 12 forward RCS valve actuators are
routed 
      to the respective forward RCS nitrogen tetroxide or monomethyl
hydrazine 
      servicing panels (six to the nitrogen tetroxide servicing panel and six
to the
      monomethyl hydrazine servicing panel). The remaining 52 sniff lines are
in 
      the left and right OMS/RCS pods. During ground operations, an interscan

      checks for the presence of nitrogen tetroxide or monomethyl hydrazine
in           
      the electrical portion of the valve actuators.

That's where the stuff is used.

  "...bipropellant reaction products such as dimethynitrosamine (DMNA) for 
nitrogen tetroxide (N2O4) MON-3 reaction with monomethylhydrazine (MMH)."

comes from a NASA Technical Report:
TITLE: Prediction of Hypergolic Bipropellant Rocket Engine Reaction
Products

Document ID: 19990079878 File Series: NASA Technical Reports

Report Number: None

Sales Agency & Price: Issuing Activity (CPIA, 10630 Little Patuxent Pkwy.,
Suite 202, Columbia, MD Hardcopy 
21044-3200) Microfiche  Issuing Activity (CPIA, 10630 Little Patuxent Pkwy.,
Suite 202, Columbia, MD  21044-3200)
- No Copyright

Authors: 
      Mayes, Dan (NASA White Sands Test Facility)  Swartz, A. Ben
(Allied-Signal Technical Services Corp.)

Journal Title: 1998 JANNAF Propulsion Meeting  Volume: Volume 1 Page:
375-384 

Published: Jul 01, 1998. There may be others.

A good place to followup with more questions like this is the "Space Team
Online " Website, at:

http://quest.arc.nasa.gov/shuttle/overview.html,

Here you can post your questions about any Space Related Topic, and one of
us will be assigned to research and answer them.

Hope this info helps !

73,
Roger,
KD4ITU



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