ML030800466

E-mail from Thomas Kendall, Wisconsin Electric, to Ken O'Brien Regarding: Flow Limiting Orifice Design.Xls.

ML030800466
Person / Time
Site:	Point Beach
Issue date:	11/07/2002
From:	Kendall T Wisconsin Electric
To:	O'Brien K NRC/RGN-III
References
FOIA/PA-2003-0094
Download: ML030800466 (4)

Text

, I Kenneth O'Brien - Flow Liimiting Orifice Design.xls , j ennth 'Brin -Flo Liiitig Oific DeignxlsPage 11I From: "Kendall, Thomas" <Thomas.Kendapll@nmcco.com>

To: <kgo@nrc.gov> ell Date: 11/7/02 3:54PM

Subject:

Flow Liimiting Orifice Design.xls Mr. O'Brian, Here's the results of my Monday Morning noodling. Not very detailed on the descriptions I'm afraid. I used Crane 410 to come up with the flow formulas, and some excerpts from a paper I have on cavitation in valves, orifices, etc. I'll copy the stuff from the paper and bring it over. The stuff in red is input, the rest is calculated. I tried to maintain a margin to cavitation of -2 (last column). The second sheet is where I created the critical cavitation index curve from published data.

Tom Kendall, P.E.

920-755-7661

<<Flow Liimiting Orifice Design.xls>>

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Upstream Pressure 1400 psia Downstream Pressure 25 psia Vapor Pressure 4 psia Pipe ID 1.9 inches Required Flow 75 gpm Minimum orifice size 0.25 inches Stage # Pu d (in) n P C dh (ft) dP (psid) Pd ar 0 crtical 1 140( 0.4375 1 0.230 0.6 1105 478 922 1.92 0.91 2 922 0.3125 2 0.164 0.6 1061 459 463 1.00 0.64 3 463 0.375 2 0.197 0.6 512 221 241 1.07 0.76 4 241 0.375 3 0.197 0.6 227 98 143 1.41 0.76 5 143 0.4375 3 0.230 0.6 123 53 90 1.61 0.91 6 90 0.4375 4 0.230 0.6 69 30 60 1.86 0.91 7 60 0.5 4 0.263 0.6 40 18 42 2.18 1.08 8 42 0.5625 4 0.296 0.6 25 11 31 2.49 1.27 9 31 0.5 5 0.263 0.6 26 11 20 1.43 1.08

-- /

Ratio 2.12 1.55 1.40 1.84 1.78 2.06 2.03 1.96 1.33

Critical Cavitation Index P (T 0.2 0.08 0.3 0.14 0.4 0.225 0.5 0.375 0.55 0.47 0.6 0.58 0.65 0.72 0.7 0.92 Critical Cavitation Index 0.75 1.25 0.8 1.6 4 0.85 0.9 2.3 3.8 3.5 3 i = 0.027SWa15oa 2

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