Test report, air flow control device for 241-SY waste tankventilation Page: 4 of 17
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HNF-SD-WM-TRP-285 Revision 0
AIR FLOW CONTROL DEVICE FOR 241-SY
WASTE TANK VENTILATION
This report documents the development and testing of a passively
operated, constant air flow control device. Included in this report are a
test procedure and test results. Testing determined that the device meets the
stated design requirements, specifically with reference to its range of useful
operating flow rate, pressure drop across the device, and ability to
accurately regulate air flow.
2.0 BACKGROUND AND SCOPE
The testing reported herein is part of an ongoing effort to develop flow
control technology suitable for use on waste tank ventilation systems
(Minteer 1995; Tuck 1995 & 1997). Testing was conducted 10-17 April 1996, in
Room 216 of building 2101M, 200 East area (see Figure 1). Test support was
provided by the Vent and Balance organization, John Comer, manager.
Testing was performed to determine whether the subject device (ref.
LMHC 1997) can meet or exceed the functional requirements set forth in the
engineering work plan (Andersen 1997) and similar to those that governed
previous designs (VanderZanden 1995; Minteer 1996; WHC 1995 & 1996) with the
exception of flow rate; an increase in size of the device was expected to
double the useful flow range over the previous design. Specifically, testing
was based on the following design goals:
* Ability of the device to maintain air flow rate within 10% of a
set value, over a range of device differential pressure (SP) from
0.75 to 4.00 inches w.g. (0.19-1.0 kPa).
" Ability to control air flow over a range from approximately 50 to
1000 ft3/min (24-470 1/s).
" Extended device performance below the specified device SP range,
i.e. less than 0.75 inches w.g.
The air flow controller is a passively operated, self-regulating device
designed to be installed at a system inlet or in line with a filter housing,
ventilation duct header, or other equipment. A single moving part, the port
controller, adjusts the internal flow resistance of the device in response to
changes in pressure. Increasing pressure across the device causes the port
controller to lift, gradually closing the outlet and restricting flow. By
this means, an equilibrium is approached with which the device maintains a
constant rate of air flow through a ventilation system as the SP across the
device (or the system) varies. By means of a view port on the device, this
action may be observed in operation as a slight oscillation or levitation of
the port controller.
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Tuck, J.A. Test report, air flow control device for 241-SY waste tankventilation, report, June 3, 1997; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc677326/m1/4/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.