ML20148S634
| ML20148S634 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 06/23/1997 |
| From: | NORTHERN STATES POWER CO. |
| To: | |
| Shared Package | |
| ML20148S609 | List: |
| References | |
| 12.5.487, NUDOCS 9707080277 | |
| Download: ML20148S634 (7) | |
Text
{{#Wiki_filter:-. - -. - .- . .- . . _ _ . SUZLER BINGHAJ PUMP Ref: E9710626. DOC Paga HYDRAUUC REPORT: 12.5.487 - NPSHR TECHNICAL REPORT
- 10 x 12 x 14.5 CVDS PUMPS FOR NORTHERN STATES POWER June 23.1997 01 l
SUBJECT:
NPSH - Report of SULZER BINGHAM PUMP (previously Bingham Pump Co.) Pump Sales. Order No. 270417/418 Pump Size: 10 x 12 x 14.5 CVDS Monticello (NSP) CORE SPRAY PUMPS Review and Analysis: by SBP HYDRAULICS GROUP: June 1997 / DLEI RL ltem 1. NPSH-Margin on Curve #26603/604 NPSPr shown on Curve No. 26603/604 represents a 1% Head-Drop per NPSH Test T- , 270417-A for Pump S.O. 270417. See CURVE #1(58374) of this report. Also, on CURVE l
#1(58374) are the NPSHr for 3% and 5% Head-Drop respectively. ALL DATA HAS BEEN l , NORMALIZED TO 3560 RPM. ,
Clarification:To clear-up confusion regarding suction specific speed "Nss". (Refer to Sheet No. 3 of calculation cover sheet by Northem States Power Company dated 04-18-97) Nos by definition is based on a 3% Head-Drop at the Best Efficiency Point. For a , Double-Suction Impeller (CVDS-Style Pump) only 50% of this flow is used, since it is ! analogous to two (2) Single-Suction Impellers in parallel. ] N,, = N * [Q *' """* ** '^* ** ""****'*
- l NPSHr.,, 3 single suction impeller. For double suction or double entry impellers use 50% of this flow.
Where:
. Nss3s = SUCTION SPECIFIC SPEED at 3% Head-Drop, this is a nominal number,
. N = Rotative Speed in Revolution Per Minute (rpm);
- Q = Flow in USGPM at B.E.P. (0.5 Q for double-suction or double-entry impellers);
. NPSHr3%= Net Positive Suction Head required in feet based on 3% Head-Drop at B.E P.
FOR THE " TESTED" MONTICELLO CORE SPRAY PUMPS, Nssasis: N,, = 3560
- 44250/ om 2m 14170, Note: This value is calculated on an actual test data andis not the design Nss. which will be a different value based on the B.E.P. @
maximum diameter. Also this value has no tolerance and is subject to variance between pumping units, due to manufacturing processes. See values from CURVE
#1(58374). The design Nss would < 14000 based on maximum diameter and including manufacturing and testing tolerances.
Comment By current standards, this is considered a "High-Nss" impeller design. Pumps of this design have a limited "perferredoperating range" outside of which increased vibration and internal re-circulation may take place. CURVE #1(58374) also identifies th3 recommended " continuous minimum flow" (greater than (2) two hours operation at this flow in a 24 hour-period). A second, intermittent, minimum flow is also identified. These values SULZER BINGHAM HQ Enaineenna E9710626. doc 9707000277 970702 PDR ADOCK 0500o263 P PDR
l Page Ref E9710826. Doc SULZER clNGHAM PUMP ! . TECHNICAL REPORT HYDRAuuc REPORT: 12.5.487 - NPSHR 02 June 23.1997 10 x 12 x 14.5 CVDS Punes FOR NORTHERN STATES POWER
}. - -
, i 1
were agreed on after the pumps were installed. Minimum flow values are based on Ns and Nss3y, . The Nssas value of =14,000 along with a Ns of =1300 for the pump, and a head value of 615 ft were used to determine the " minimum flow (s)" ) i Pump Specific Speed is approximately: 4 l 3560 V4250/2 ' N, ,= #*40/2 H "" 4 siegt 615"" i Note: This is not at B.E.P. and maximum diameter impeller, but calculated from the l " trimmed" performance curve. Some references use Nspo,n, , which would increase
- the above value by a factor of 1.414 or the square root of 2 since the pump is a
- double suction design. The values for " minimum flow", in %, are taken from SBPI I
Standard E31.68 and are guidelines used by SULZER BINGHAM in establishing a recommended minimum flow. i i Item 2. and 3.: NPSHa vs. Flow - Review of Cavitadon Report 12 x 14 x 14.5 CVDS, Pump S.O. 270425 dated May 15 & 16,1969
- o On Pump S.O. 270417 [10 x 12 x 14.5 cvos) a NPSH Test (T-270417-A) was performed.
l This test identifies NPSHr based on 0%,1%,3% and 5% Head-Drop in the range of { 4000 to 5300 GPM. The point of head collapse was not established. This is not ; I required for a NPSHr Test. A Cavitation Test is used to establish these values and is ; j a much longer and demanding test to conduct. ! { o The Impeller in the 12 x 14 x 14.5 CVDS per S.O. 270419/426 are identical (except Trim- ! Diamster) to the one in S.O. 270417/418, namely pattem #1213 CVDS-1. t )' o The NPSHr tests base on 3% Head-Drop performed on S.O. 270425[12 x 14 x 14.5 cvos) and S.O. 270417[10 x 12 x 14.5 cvDs] are identical in the flow regime of 4000 -
- 5300 GPM. On Curve #2(58375)the NPSHr3% values have been added in dotted line j from T-270425-2 in the flow ranges of 3500 to 4000 GPM and 5300 to 6000 GPM.
4 L o On Pump S.O. 270425[12 x 14 x 14.5 cvos) a Cavitation Test was performed. This test l was conducted on May 15 and 16 of 1969. Based on these tests the NPSHa at points of head collapse have been added on Curve #2(58375). ) o it can be stated that the CORE SPRAY pumps for MONTICA 1 O (Pump S.O. 270417/418) will j have the same NPSHr performance and the same expected cavitation flow j performance as Pump S.O. 270425, since they are of identical impeller design (same L pattem) and show identical NPSHr3% performances between 4000 and 5300 GPM. .lds l notpossible toplotpump flow vs. NPSHa from initial value down to 20 feet. in onefaat j increments. Insufficient number of NPSHr data points were taken during referenced
- tests to demonstrate this. In addition no NPSHr - data below 4000 GPM and no j Cavitation Test data below 4000 GPM are available.
l SULZER BINGHAM HQ Engineenna E9710626. doc 1
1 i
- CUZLER BINGHAM PUMP Ref; E9710626. doc Page HYDRAUUC REPORT
- 12.5.487 - NPSHR TECHNICAL REPORT l 10 x 12 x 14.5 CVDS PuesPs Fom NORTHERN STATES POWER June 23.1997 03 !
^
Curve #3(58376), generated from T-270417-A and T-270425-2 provides sufficient data ! to predict what will be happening to the pump when reduced NPSHa is encountered. l (
- 4. Item 3 is =pp!k=Me to the A1066iGII o ConESPRAYPt~.~s i j
lt has been confirmed that the Core Spray Pumps S.O. 270417/418[10 x 12 x 14.5 cvos] l l are hydraulically identical (same impeller pattern, same volute area, except trim diameter and pump l ] nozzle sizes) to the residual heat removal (RHR) pumps S.O. 270419/426[12 x 14 x 14.5 ! ! cvos). There will be some minor performance differences due to the size of the i . suction and discharge nozzles. ; i >
- j The requested material comparison shows that both services use impellers made from ASTM A296. Gr. CA-15 (now replaced by ASTM A743 Gr. CA6NM). Both alloys have greater f
l' l than 11% chrome with the CA6NM(13-4) being the easier grade to perform weld repair l on. l- Pump S.O. 270425 went through extensive cavitation testing for several hours without { } visible damage to the impeller, it can be wrmised that Pump S.O. 270417/418 will ; l experience similar wear to the impeller when operated for 10 minutes (following a LOCA) '
- at NPSHa values 0.5 feet above head collapse value shown on Curve #2(58375) and
l Curve #3(58376). ! u
- Additional Comments:
I Despite the fact that the suction specific speed (Nss), based on tested 3% Head-Drop ; j [Nssa =14170], is high by current standards it should not imply that when properly l 2 applied these designs are " bad". However, it should be inferred you must know the ! ! recommended operating parameters and ranges in which they should be used and the ! l duration of these periods. It is possible to design a new impeller with a higher Nssas !
- (larger eye-dia, flatter suction vane angle of eye, well-rounded suction vane in;et profile with reduced
] thickness ) However, the minimum flow values would be increased over those shown on l CURVE #1(58374). l In addition, the double-suction impeller would be designed with " staggered" pumping l vane configuration to reduce pulsation-and vibration levels (this is important for pumps l running at the higher rpm's). There will be no measureable impact on the suction side ofthe [ impellerfor thisfeature. The " net" impeller width at O.D. would be decreased to stay j with proper side-wall clearance to the volute, the vane discharge angle would be increased to stay with the same impeller outlet-area.
- A slower pump speed,1760 rpm, would reduce the NPSHr values, however the impeller diameter would need to be approximately double the current size to meet the
! same hydraulic conditions. This poses some interesting mechanical problems as well j as potential hydraulic problems when operating a low flows. 4 2
- sUt.ZER BMGHARI HQ Engineenng E9710626. DOC
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