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Hi Jon,
I haven't sandblasted in a tight space like that, but I have sprayed paint
in them and it got pretty foggy until I got low pressure equipment.
Three suggestions:
1. Assuming your lower viewport hole is open, attach a length of
HVAC duct (8 to 12 feet) to it and construct a cardboard chamber to
the other end of the duct to which you fit a household HVAC filter and a box
fan. When you run the fan in exhaust mode the filter will
prevent the blast medium from ruining the motor. You might have to
change filters a few times. A good portion of the medium will fall to
the bottom of the duct before it gets to the fan. If you run the fan to
force air into the sub you'll first want to clean any blast medium out of the
duct (have to remove it from the sub to clean it and blow it out) and remove the
filter from the fan.
2. My shop vac will pick up a 1.2 gallons of water per second and has
12 feet of hose. I would stick the hose inside with a wire cage around
the end to keep it from grabbing onto a surface. The vac can be used
to pick up the blast medium that falls to the bottom of the sub and it
exhausts air as well.
3. Start the farthest away from the hatch and work your way toward
the hatch.
I understand the shop will actually be doing the job, but I'm assuming
you'll have to provide the above system or something like it. It's
cheaper for you to do that part anyway. Let us know what you do and how it
works out.
Cheers,
Jim
In a message dated 5/9/2012 12:02:14 P.M. Central Daylight Time,
jonw@psubs.org writes:
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