Q10-7. LOX is moved from the storage tank to the
the risk of contamination, do not leave systems open
any longer than necessary. Always take steps to protect
transfer tank of the TMU-27/M by what
open systems against possible contamination. Use
means?
clean polyethylene bags, sheet material, and
1.
By gravity
polyethylene pressure-sensitive tape to wrap and seal
2.
By a pump
dissembled or exposed parts, subassemblies, and
3.
By gas pressure in the storage tank
assemblies. If possible, store disassembled items in a
4.
By a vacuum in the transfer tank
clean room until they are required for assembly.
Q10-8. The two types of safety devices on a LOX
Prior to opening a LOX system, inspect the
cart are relief valves and rupture discs?
exterior for the presence of hydrocarbons. Use
ultraviolet light to check parts, couplings, vent lines,
1. True
converter and storage tank fill lines, and surrounding
2. False
areas for the presence of hydrocarbons prior to opening
Q10-9. Which of the following tests is used to
the liquid oxygen or vacuum system.
determine if a LOX cart is experiencing an
Wear clean, white, lint-free gloves while working
unacceptable rate of loss?
on a oxygen system. Clean, tag, and bag any removed
1.
A storage tank piping test
parts that will be reused. Limit disassembly to the level
2.
A vent line flow test
that is necessary for repair or replacement only. Do not
3.
An evaporation loss rate test
remove a component solely for the purpose of cleaning
4.
A transfer tank vent line test
and inspecting it.
Q10-10. Which of the following terms is often used to
Q10-3. Gaseous oxygen becomes a liquid when it is
describe the storage tank piping test?
cooled below what temperature?
1.
The bubble test
1.
183F
2.
The leak test
2
200C
3.
The sweat test
3
242C
4.
The hiss test
4
297F
Q10-11. LOX used by the Navy must contain a
Q10-4. When warmed to ambient temperatures
(about 70), LOX expands to what ratio of
minimum of how much pure oxygen?
its liquid volume?
1.
95%
1.
10 to 1
2.
99%
2.
150 to 1
3.
99.5%
3.
862 to 1
4.
99.9%
4.
1200 to 1
Q10-12. Which of the following contaminants is the
Q10-5. How is the tank of a liquid oxygen storage
most hazardous hydrocarbon that can be
tank constructed?
found in LOX?
1. It is a single wall tank insulated with
1.
Styrofoam
2.
Acetylene
2. It is a double-wall tank with a
3.
Helium
powder-type material used as an
4.
Carbon monoxide
insulator
3. It is a double-wall tank with helium gas
Q10-13. Which of the following is NOT a condition
used as an insulator
under which you would perform an odor
4. It is a single-wall tank with no insulator
test on a LOX cart?
Q10-6. What is the storage capacity of the
1. After filling the storage tank
TMU-70/M LOX cart?
2. Upon completion of preoperational
1.
10 gal
inspections
2.
20 gal
3. When the tank has been left empty
3.
35 gal
without positive pressure
4.
50 gal
4. Whenever contamination is suspected
10-22
