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ORNL-2106 - the Molten Salt Energy Technologies Web Site

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ANP PROlECT PROGRESS REPORT<br />

-<br />

t<br />

-<br />

W<br />

I<br />

350<br />

/<<br />

//<br />

5 y<br />

300 I<br />

/ '/ '0<br />

/<br />

250 '<br />

0'<br />

a<br />

a 'I/<br />

200 .<br />

A<br />

0-<br />

5 4 I<br />

A<br />

150 ,-A I<br />

I<br />

100<br />

50<br />

I<br />

I<br />

*A-<br />

I<br />

I<br />

I<br />

I?<br />

0<br />

et<br />

<strong>ORNL</strong><br />

mcm%<br />

I-DWG 14955<br />

0 200 400 600 800 4000 t 200 1400 1600 1800 2000<br />

FLOW (gprn)<br />

Fig. 1.4.3. ART Primary NaK Pump (Model PK-P) Performance Curves of Head vs Flow Showing<br />

- - -<br />

Efficiency and Volute Pressure Balance Lines.<br />

0.030 in. and <strong>the</strong> optimum radial clearance to be<br />

0.015 in. These clearances will result in a bypass<br />

flow rate of 3 to 6 gpm at 1220-gpm pump-discharge<br />

flow.<br />

Static deflection tests were made on <strong>the</strong> pump<br />

shaft used in <strong>the</strong> water test rig and on <strong>the</strong> lnconel<br />

pump shaft to be used in <strong>the</strong> final pumps. The<br />

information obtained, along with <strong>the</strong> calculated<br />

deflection of <strong>the</strong> lnconel pump shaft during high-<br />

temperature operation, indicated that a top labyrinth<br />

52<br />

seal radial clearance of 0.015 in. should be suffi-<br />

cient to prevent rubbing of <strong>the</strong> impeller hub against<br />

<strong>the</strong> top labyrinth seal.<br />

These water tests of <strong>the</strong> primary NaK pump indi-<br />

cate that <strong>the</strong> pump will meet <strong>the</strong> head and flow<br />

conditions required for <strong>the</strong> ART. A pump tank gas<br />

pressure of 10 psigshould be sufficient to suppress<br />

cavitation at <strong>the</strong> design flow rate and up to a NaK<br />

temperature of approximately 138OOF. The design<br />

conditions are in <strong>the</strong> range of minimum volute ,-<br />

hydraulic unbalance.<br />

LiJ

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