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DMJM H&N ! AECOM
RPP-24544 REV Id
Project Number: 145579
Page 9 of 12
Calculation No 145579-D-CA-056
ORIGINATOR: John Irwin 03-25-2006
Rev.
No.: 1
Calculation Title: DBVS OGTS Bypass System CHECKER: A McConwe l C
5.0 Results and Conclusions
The AFT flow model results are categorized by the assumptions on the condition of the
three sets of HEPA filters (ICV inlet HEPA, Bypass system main HEPA and Bypass
system inlet bleed HEPA) in the system and the assumption on the flow split between the
main bypass flow from the ICV box and the flow through the inlet bleed filter. The
HEPA filters are defined by the condition of "clean", i.e. the manufacturer's stated
pressure drop for new filter elements, or "dirty", the maximum expected pressure drop
during operation.
5.1 Results for the Selected Fan Cases
For a nominal flow of 750 ACFM at the fan and an 8 inch mainbypass line with 875 °F
ICV outlet temperature, a fan was selected to achieve this flow rate with a static head
capability of approximately 15 inches w.c. A NYB fan, model number 1508 was
determined to be acceptable for this application. An evaluation of the selected fan was
performed. The following results (Tables 2, 3, and 4) were determined by the AFT
Arrow flow model.
Table 2. ICV Box Pressure with the Bypass System.
1) Inlet bleed valve position set to achieve a nominal 60% of full fan flow through the inlet bleed
filter when the main bypass line is open to the ICV box.
Form I P 3.3-2F, April 2005
A5-471