ML20083K728
| ML20083K728 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 08/28/1978 |
| From: | FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML20083K722 | List: |
| References | |
| NUDOCS 7901300122 | |
| Download: ML20083K728 (45) | |
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1-i- i 4 e FLORIDA POWER CORPORATION CRYSTAL RIVER - 3 DECAY HEAT PUMP 1-A VIBRATION ANALYSIS BY
' EXTERNAL ACCELERCMETER J. M. HUZDOVICH SUPERVISORY ENGINEER REACTOR DIAGNOSTIC SERVICES NUCLEAR. SERVICE DEPARTMENT AUGUST 28, 1978 THE BABCOCK AND WILCOX COMPANY 1
I 7.9 0.13 0 0 /@ A 1
CONTE:'TS 1.0 References & Attachments l 1 2.0 Introduction ! 3.0 Data Analysis 4.0 Summary 9 e e e
. W
1.0 REFERENCES
& ATTAC.T4ENTS 1.1 Memo: R. V. Green to J. R. Shetler - 5/18/78; File NSS-7/T3.36. " Decay Heat Pump 1-A Disassembly & Visual ! Inspection. ,
1.2 Attachment 1 - Frequency Identification & Calculations. 1.3 Attachment 2 - Overall Noise Levels. 1.4 Attachment 3 - Individual Frequency Levels in G-R?.S. 1.5 Attachment 4 - Data Cocparison Tables - Individual Frequency Levels in G-P3.S versus A-Pump, Data Sets 2 & 3 and B-Pump D,ata Sets 2 and 3. 1.6 Attachment 5 - Selected Frequency Spectra'and Comparative Overlays. 1.7 Vibration Tolerances for Industry ASME 67-PEM-14, presented by R. L. Baxter and D. L. Bernhard. 9 I e o e
- 9 A
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2.0 INTRODUCTION
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Frequency Data was obtained by RDS personnel (Reactor Diagnostic Services) on the FPC Decay Heat Pumps (la & 1B) on several occasions utilizing acclerceeters installed externally on the pap, connected piping, and bearing
- housing. A typical data channel and the data sets
! acquired are shown on Figure 1. Figure 2 shows the monitoring points on the pump, meter, and base plate. The acquired data was reviewed for frequency content and noise source identification and then compared to other data sets to identify comparable performance and trends in performance for the 1A Pu=p. 1he
~
1 data sets co= pared were Pu:p A, Sets 2 & 3, and Pump B, Sets' 2 & 3. a These comparative data are presented in Attachment 4. Raw data reduction consisted of plotting the overall noise levels, i tabulating the magnitude versus frequency for. selected accelerometer locations, and overlaying Power Spectral Density Plots for direct spectra comparison, which is another type of comparative analysis utilizing visual observation as opposed to numbers. comparison. The overlays were'done on h selected channels and analysis ranges. The channels ulticately selected for detailed evaluation.were 5, 6,
~
8, 9, and 10. Channels-1, 2, 3, & 4 were associated with the motor and
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showed no significant levels to explain pump performance other than'a contributdonattherotationalfrequencieswhichmaynormallybe' attributed
- 'to this type of pump-drive arrangement. Channel 7 was also deleted from the -
analysh as this, location exhib$ted a spectrum characteristic' of the pump-drive e.ombination with no discernahM trif1'aence from the mount or foundation.
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2.0 INTRODUCTION
5 (Continued) Channel 12 was representative of the data from channel 5 and was also judged to lend no further insight to" pump perfor=ance. Channel 8 was used for the axial pump signature, the da+a from channel 12 was not used as it was simply redundant with channel 8. D 6 9 s S e O 4
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3 3.0 DATA ANALYSIS 4 3.1 The total noise level readings were taken by si= ply reasuring l the 316 nal RMS voltage level. These data reflect the breadband noise level due to all sources and are useful in dE:cnstrating trends in broadband phenomena such as hydraulic instabilities, , rubbing and contact between non-lubricated wear surfaces. Attachment 2, B-Pump, Data Set 3, shows high backgrcund noise level (point 8). This is also seen in Figure 5-1 of Attachment 5 This high level is believed to be due to the fact that the B-DH Pump was on recire from the BWST. However, the high level is breadband in nature and has little affect on the individual frequency tagnitudes. In addition, the rest cf tne 3 .:urp Cata i j , Set 3 data indicates a nor= ally runnin5 pu=p. Ib.us, this data set is still used in the' comparative analysis. The r=-=ir.ing data sets - shown in Attachment 2 are within reasonably expected values and were taken with the respective pump on recirc from the core rather than the BWST. The reduction in noise level at monitoring peint 6 (for the -
, A Pump) is of' notable significance. Undoubtedly this' is due to the approximately 10 to 1 decrease in the magnitude.of the signal at 1375 HZ.
Valid conclusions'regarding the A Pump performance based en cccparison i of these data are:
- 1. The A Pump is running at least as good as the B Pu=p.
- 2. The overall noise level on the A Pu=p Casing IPosition 6) l is decreasing significantly. ~
i l .3.2 Attachment 3, Individual Frequency Levels in G-3:S shows an expected decrease in noise level as the A Pump accumulated run-in time. Set 2 was taken within four hours after bearing replace:est and reassembly. Set 3 was taken after approximately seventy-five (75) hours of operation. The levels recorded after' the run-in' period indicate a very favorable pump operating condition per industry standards (Ref.-l.7)7 w-
4 3.0 DATA ANALYSIS 3.2 (Continued) and compared to B-Pump performance. The dramatic decrease in the level at 1375 HZ between Data Sets 2 and 3 for the A Pump is of interest. This is believed to be indicative of either the shaft assembly (a new carten runner on a metal contact surface) seating itself (see Attacb-="t 5, Figure 5-8, overlay at this frequency for Position 6) or a reduced influence from flow induced vibrations in the piping syste . On close scrutiny, this frequency is also evident on the B-Pump data set, which was taken after several thousand hours of operation. This particular noise will be examined in more detail when baseline dat'a is established for both pumps. . 3.3 Attachment 4 comprises the basic comparison betwee: the A and B Pumps. In addition the data is tabulated so that the A Pu=p is compared against itsel'r after approximately 75 hours of run time. Excluded in this comparison are the bearing frequencies listed in Attachment 1. The frequencies.of interest here are the dominant rotational, pu= ping, and shaft seal frequencies. Except for channel 5, A Pccp', Set 3 co= pared to A Pump, Set 2, the trend in the A Pu=p readings is fkvorable as co= pared to the B Pump data. Particularly 6n an A Pump, Set 2, to A Pump Set 3 comparison, the A Pump appears to show improvement zith run time and by
. industry standards is not unusually noisy after 75 tours of runtime. Based-on this data, a reasonable conclusion is that there is no non-lubricated metal-to-metal rub as indicated by the extremely los noise levels at the various ' frequencies, no high frequency (1-2KHZ) spising and low broad-band noise levels. '
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5 3.0 DATA ANALYSIS 3.3 (Continued)
.These low levels are characteristic of a smooth running machine by industry standards. In addition, Reference 1.1 sn=enrizes a disassembly and visual inspection of the A Pump after the post impeller repair run-in period. This inspection showed no metal wear on any rotating members.
3.4 Attachment 5, Fig.-5-2&5-5, depicts the reason for the increase in noise levels monitoring position 5. The overlays show a " spiking" (circled peaks) at frequencies previously calculated for the radial and thrust bearin6s. Although these new peaks do not add significantly to the overall noise level, they can influence the rotational and pumping frequency peaks and certainly, as shown on the overlays, have individual characters of their own. Significantly, several of these bearing frequencies have increased, or appeared, 6-db above their previous level. This represents
- a. quadrupling of power for a PSD measurement and is reason for concern.
Based on this observation, a recommendation was made by RDS personnel that the bearings be replaced 'on the A Pump. Corroborating evidence regarding the. bearing condition was obtained by taking shock pulse measurements (SPM) on the bearing housing. These reasuresents showed the SPM to be high for a pump with newly replaced bearings, thus strengthening the recommendation for replacing the A Pump bearings. . 6 e k e 4 e
- 6 4.0 SLMiARY The data acquired by external accelerometer $ indicate faulty operation of the bearing assembly and prompted the recccrendation that the bearings be replaced. The lack of significant unidentified frequency peaks, the acceptabl'e noise levels both broadband and at individual peaks, and the visual inspection which showed no metal-to-metal contact in the
. cp assembly, indicate that the "A" Pump is running with sufficient clearances to preclude the type of failure experienced twice before.
*(For the A Pump)
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- i
f ACCELERCMETEll --> LINE DRIVER -i> SIGNAL CONDITIONER + SPECTRUM ANALYZER --> X-Y PLOTTER 1he signal channel was calibrate'd by attaching the Accelerometers to an NBS traceable Unholtz-Dickie portable shaker and inserting 1 G Rms through the chain and checking the 1 volt RMS out of the charge amp. This was done on all channels prior to data acquisition. DATA SETS: - PUMP - 1A PUMP - 1B NOTE: SET 1 was taken only on the B -Pump on 6-6-78. This set established the basis for sub-6-26-78-SET 2 - 6-26-78-SET 2 sequent measurements and was c nsid red as prelimin ry data 0-100 IlZ 0-100 IlZ nly. The final two data sets 0-500 IIZ 0-500 tiz were 0-2 Kitz 0-2 KilZ en a en and Gese are We . only sets considered in the analysis.
'8-3-78-SET 3 8-3-78-SET 3 0-100 IlZ' O -100 IIZ
.o-$00liZ O'-500 liZ ,
0-2 KilZ 0-2 KilZ FIGURE 1 JSS 8/28/78
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Attachment 1 Frequency Identification & Calculations 1 O e e O 6 i
Table '.1 Frequency Identification I Fundamental Rotational Frequency - ff 29.6HZ X2 59.2HZ X3 88.8HZ Pumping Frequencies -f f x $ vanes 148HZ X2 296HZ X3 444HZ
~X4 592HZ Motor Frequencies No significant participation in the pump signature.
~ Bearing Frequencies - attached. Calculated per the formulas on the attached sheet. 4 9 0 6 9 9 0 0, a
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- . . - _ _ . . = _ = . . . . . . . _. -- .. ._- --- .- .-
Bearing Frequencies j i : Radial 5214C3 10 Balls Thrust 7313B 12 Balls Radial Bearing - 5214C3 B = 2.76 D = 4.92 E = 1/2 (B + D) = 3.84 d = 11/16 = .688 N = 10 ! . m = 35' ff = 29.6 - i fE0 = f f
--.2 (1 ,d COSa) = 29.6 (1 .688 COS 35*) = 14.8 (1 .147)
E 2 3.84 ! fE0 = 12.62 HZ i IEI " ff (1 + d C0sa) = 14.8 (1.147) fEI = 6.98 HZ . 2 E l.. 2 f3=Eff (1 - d2 COS a) = 82.60 (1 .022) fB = 80.78 HZ j d2 F f B0
= Nf E0 f = 126.2HZ l B0 FBI = NfEI FBI = 169.8HZ i.
4 e 4 O e i
Tablo 1-2 (Continusd) Thrust Bearing - 7313B , i B = 2.56 D = 5. 51
- E = 4.04 d = 15/16 = .938 N = 12 a = 40*
f = 29.6 f fE0 = 14.8 (1 - d COSa) = 14.8-(1 .178) f E0 " E f = 14.8 (1 + g,cosa) f g1 = 17.43 KZ g7 E 2 f = 14.8 (E) (1 - d$ COS a) = 14.8 (4.31) (1 .032) f =B 61.75H2 (d) ( E ) I ~ fB0 " "f E0
- BO f
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EI BI 7313B THRUST HARMONICS 1 2 3 4 5 6 7 8 9 12.17 24.34 36.51 .48.68 60.85 73.02 85.19 97.36 109.53
. 17.43 .34.86 52.29 69.72 87.15 104.58 122.01 139.44 156.87 61.75 123.5 185 247 308 370 ,
432 494 555 146 292 '438 584 730 876 1022 1168 1314 209 418 627 836' 1045 1254 1463 1672 1881 5214'C3 RAD 12.62 25.24 37.86 50.48 63.1 75.72 88.34 100.96 113.58 16.98 33.96 50.94 67.92 84.9 101.88 118.86 135.84 152.82 80.78 161 242' 323 403 ,484 565 646 727 126.2 '252 378 504 631- 757' 883 1009 1135 169.8 340 509 679 849 1018 1188 1358 1528 O W
1-3 B_ earing Frequency Calculations Nomenclature: . B = Bore, inside bearing diameter (inches) d = Ball diameter (inches) D = Outside bearing diameter (inches) N = Number of balls E = Pitch diameter = 1/2 (B+D) (inches) a = contact angle (degrees) f'= Fundamental rotational frequency (RPM /60) (IIZ) Formulas Frequency (llZ) Approximate Contact Angic Remarks Cage to outer fg (1-d/E) fg (1-d_ COSa) Fundamental cage (train) frequency when ring frequency 7 E the inner ring is rotating and the outer 3 ring is stationary. (fgn) Cage to inner f (1+d/E) f Fundamental cage (train) frequency when
# f (1+d/E COSa) the inner ring 10 stationary and the outer "9" ""I ^
2 2 ring is rotating.
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( . l . Ball frequency Ef g' Spin frequency of a rolling element. A l (fB) 'yg- (1-d /E2) 2 Efr (1-d COS a) 2 rough spot or indentation produces twice 7d- E7 this frequency. Outer ballpass Nf EO requene es genentd due to an irregularity E0 on the stationary raceway. (fB0) Innor,ballpass Nf gg Nf EI Frequencies generated due to an irreguinrity (FBI) on the stationary raceway. Cage to rotating f -f r f -f g EI 9" "'I " " " " ring (fER) the cage und the rotating ring. For an irreg-or - or ularity tu the ring, a frequency of (I ER be generated.
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[ E0 f EO Note: In the' case of many irregularities, the harmonics of the above frequencies will be evident in the noise spectrum.
) '
I Attachment 2 hera11 Noise Leye1g G 9 9 e O O e
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. - . _ .,.- . .. . . - . . . _ . - -- . . - . . = - . - - . . _ - . _ _ . . . . . - . _
l Table 2-1 . i e Overall Noise Levels
; MVRMS-4 A-Set 2 B-Set 2
. 5 - 1020 5 - 1245 ;
6 - 1600 6 - 765 1
< - 8 - 1395 8 - 1750 <
l 9 - 510 9 - 495 i l 10 - 1100 10 - 1400 12 - l 4
.A-Set 3 B-Set 3 l 5 - 875 5 - 1125 6 - 1035 6 - 625 8 - 1590 8 - 2925 9 - 1170 9 - 930 10 - 1.080 10 - 2400 12 - 850 12 - 650 i
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, Attachment 3 Individual Frequency Levels in G-RMS m
4 4 0 0 e k 7) s' w-
Tr.ble 3-1 l Frequency Levels in G-RMS Pump A Set 2
)
l Channel Frequency 5 6 8 9 10 ' Rotational 29.6 < 003
. .005 .017 .0061 .032 59.2 . 027 .045 .29 .017 .14 88.8
. 026 .028 .019 .0043 .063 Pumping 148 .19 .63 .073 .18 .M 296 . 027 .41 .037 .064 .73 444 . 017 .19 .033 .05 .M 592 -. 021 .32 .012 .034 .57 Seal & Pipir4 .
1375 " .15 4.1 .55 . 2 2.2 , Other e 4 6 6 6 e t
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. Table 3-2 l
. l Frequency Levels in G-RMS Pump A Set 3 4
Chann'el Frequency . 5 6 8 9 10 Rotational
- , 29.6 .002 <.003 ' .003 <.003 <.003 f
59.2 .066 .012 .042 .018 .009 88.8' .032 .012 .0078 .02 .018 Pumping 148 .23 .099 .12 .18 .051 296 .04 .065 .039 .042 .069 ., . 444 '
.012 .013 .039 .021 .03' 592 .043 .054 .18 .017 .21 Seal & Piping 1
1375 .28 .39 .28 .25 .345 r Other S' I . s s
# 9 a
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Tabla 3-3 I I ( Frequency Levels in G-RMS. l l Pump B Set 2
~
1 l Channel l Frequency 5 6 8 9 10 Rotational 29.6 .10 .017 .033 .026 .035 59.2 . 042 .11 .64 .12 .35 88.8 .11 .045 .095 .042 .061 Pumping 148 - .37 1.33* 1.4* .48 1.93* 4 296 . 023 .24 .63 .69 .82 444 . 012 .19 .44 1.0 .27 592 . 011 .22 .51 .15 .7 Seal & Piping i 1375 . 016 .19 .2 .069 .15 Other
- Note: Noise levels indicate pump in cavitation.
g D i O. +' a 6 O 4- . g
. Table 3-4 .
Frequency Levels in G-RMS Pump B Set 3 I l Channel Frequency 5 6 8 9 10 Rotational 29.6 .009 .0057 <.003 <.003 .0036 59.2 .024 .04 .087 .035 .054 88.8 .02 .0062 .0084 .0042 .0035 Pumping 148 . .23 .22 .27 .25 .35 296 .024 .007 .18 .081 .17 444 .014 .03 .066 .096 .015 592 .039 .03 .036 .09 .09 Seal & Pipir4 1375 .019 .012 .054 .03 .066
. Other i
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Attachment 4 Data Comparison Tables i a 9 e e e
l T blo 4-1 l l l CHANNEL 5 Level in G-RMS l l f A Pump Set 2 A Pump Set 3 B Pump Set 2 B Pump Set 3 29.6 <.003 .002 .10 .009 59.2 .027 .066 .042 .024 88.8 .026 .032 .11 .02 148 .19 .23 .37 .23 296 .027 .04 .023 .024 444 .017 .012 .012 .014 592 .021 .043' .011 .039 1375 .15 .28 .016 .019 m o e 9 e e
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Table 4-2 - CHA!aiEL 6 Level in C-RMS f A Pump Set 2 A Pump Set 3 B Pu=p Set 2 B Pumo Set 3 29.6 ,
.005 <.003 .017 .0057 59.2 .045 .012 .11 .04
. 88.8 .028 .012 .045 .0062. 148 .63 .099 1.33 .22 296 .41 .065 .24 .007 444 .19 .013 .19 .03 592 .32 .054 .22 .03 1375 4.1 .39 .19 .012 o 4 w
Tcblo 4-3 CHANNEL 8 Level !n G-RMS f A Pump Set 2 A Pump Set 3 B Pu=p Set 2 B Pure Set 3 29.6 .017 .003 .033 <.003 59.2 .29 .042 .64 .087 88.8 .019 .0078 .095 .0084 148 .073 .12 1.4 .27 296 .037 .039 .63 .18 444 .033 .039 44 .066 592 .012 .18- .51 .036 1375 .55 . .28 .2 .054 P O e O
Tcblo 4-4 CHANNEL 9 Level in G-RMS f A Pump Set 2 A Pumo Set 3 B Pump Set 2 B Pump Set 3 29.6 .0061 .003 .026 <.003 59.2 .
.017 .018 .12 .035 88.8 .0043 .02 .042 .0042 148 .18 .18 .48 .25 296 .064 . 04 2 .69 .081 444 .05 .021 1.0 .096 592 .034 .017 .15 .09 1375 .2 .25 .069 .03 P
S e
Tablo 4-5 . CllAmEL 10 Level in C-RMS f A Pump Set 2 A Pump Set 3 B Pump Set 2 B Pump Set 3 29.6 *
.032 <.003 .035 .0036 59.2 .14 .009 .35 .054 88.8 .063 .018 .061 .0035 148 .44 .051 1.93 .35 296 .73 .069 .82 .17 444 .44 .03 .27 .015 592 .57 . 21' .7 .09 1375 2.2 .345 .15 .066 4
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Attachment 5 Selected Frequency Spectra And Comparative Overlays O e 0 e S e 1 h i w.
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