Tests to determine effect of humidity on high-efficiency filters when installed horizontally Page: 4 of 8
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UNCLASSIFIED -2- nW-66995
TESTS TO DETERMINE EFFECT OF HUMIDITY ON
HIGH-EFFICIENCY FILTERS WHEN INSTALLED HORIZONTALLY
I. OBJECT OF TESTS
To determine effect of high-humidity air on the physical characteristics
of filter media and separators when the filter is mounted in the horizontal
position. Usual installation is with the filter mounted vertically.
II. BACKGROUND AND JUSITIF'ICATION
The fabricator of the mounting frames for the Reactor Confinement Project
has experienced difficulty in maintaining the necessary tolerances re-
quired for the frames. These frames are sealed to frames cast in the
building structure by means of inflated neoprene tubes. With this design
even slight deviation from tolerance can not be permitted The filter
units are installed in the large frames at one site, and then transported
to the point -f use where they are installed in the vertical position.
This method exposes the filters to numerous possibilities of damage. The
filters are easily damaged, and extreme care is necessary in the handling,
transportation, and installation. This being so, any reduction in handling
or moving would be beneficial.
It has been proposed that a different mounting frame design be prepared for
NPR. The proposed method of installation, coupled with then use of smaller
frames, would permit greater dimensional tolerances and, consequently, easier
fabrication, handling, and installation.
Before initiation of the proposed design, it was necessary to determine
effect of high-humidity air on the filter unit when installed horizontally.
III. METHOD OF TESTING
An additional chamber was installed on the filter testing appara+as located
in the fan, room of the 234-5 Building. This chamber is designed for mount-
ing the filter in the horizontal position. The air flow through the filter
is directed either vertically upward or downward by repositioning guillotine
hucidification is supplied by bleeding steam into the air duct upstream of
Two filters were obtained from those purchased for the IPC Confinement Pro-
ject (C01-791). A new filter was used in etch test.
It was originally intended to conduct the tests with exposure of 48 hours
at 80% R.B., 48 hours at 90% R.H., and 48 hours at 100% R.H. This was
found impracticable, as it required close and continuous round-the-clock
observance ano manipulation of the steam supply. The man-hours involved
would not be justified.
Instead of following the above method it was decided to perform cc-bined
R.H. tests, with shift personnel in the bu. .ing checking the test peri-
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Palmer, J.H. Tests to determine effect of humidity on high-efficiency filters when installed horizontally, report, October 4, 1960; United States. (https://digital.library.unt.edu/ark:/67531/metadc1199334/m1/4/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.