Boiler feed pump recirculation valve problem
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Transcript of Boiler feed pump recirculation valve problem
![Page 1: Boiler feed pump recirculation valve problem](https://reader031.fdocuments.in/reader031/viewer/2022033009/5889e2a41a28ab32458b463b/html5/thumbnails/1.jpg)
Performance of the BFPs after rectification of CCI Drag Make Recirculation valves passing
Prepared by
KODANDAPANI VUDUGUNDLAADE/TURBINE MAINTENANCE/RTPP
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,
RC Valve Details
Type : CCI Drag 100DR 4X4 GLOBE VALVEPr class 2500 ANSI
Design pr -320kg/cm2, Temp-180CMax seat leakage-5cc/min
valve Trim -24 stage disc stack
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MAINTAIN LIQUID LUBRICATION INSIDE PUMP INTERNALS
MAINTAIN MINIMUM FLOW(125T) THROUGH PUMP TO AVOID FLASHING OF WATER
AVOID PUMP SEIZURE
VALVE OPENS AT 100 T BFP SUCTION FLOW VALVE CLOSES AT 220T BFP SUCTION FLOW
IMPORTANCE OF RECIRCULATION VALVE
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NRV
At 6 mts
LOCATION OF VALVE
At 21 mts
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FEED WATER INLET TAPPING FROM BFP DISCHARGE
FEED WATER OUTLET TO DEAERATOR
RC VALVE INTERNALS
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HIGH FEED FLOWHIGH MOTOR AMPERAGE
PUMP VIBRATIONSDAMAGING OF NRV IN RC LINE
OUTAGES OF PUMP
PROBLEMS FACED
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Dismantled all RC valvesFound damaged Seat Ring & Plug
Replaced with new one & Reassembled
Spare parts usedPlug assembly ,Seat ring ,Guide
bushing balance seal and soft goods.
WORKS ATTENDED
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DAMAGED PLUG
DAMAGED PORTION
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DAMAGED SEATDAMAGED PORTION
FLEX GASKET
SEAT RING
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PLUG ASSEMBLY
GUIDE BUSHING
BALANCE SEAL
STEM
PLUG
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BONNET METAL SEAL
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DISK STACK
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BALANCE SEAL
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FLEX GASKET
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SET OF RC VALVE INTERNALS
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PERFORMANCE OF PUMPSAFTER RECTIFICAION AT FULL LOAD
BFP-5A BFP-5B BFP-5CFEED FLOWT/HR
CURRENTAMPS
FEED FLOWT/HR
CURRENTAMPS
FEED FLOWT/HR
CURRENTAMPS
PREVIOUS
364 306 370 315 355 310
PRESENT 342 297 332 292 344 300
CURRENTSAVING
9 A 23 A 10 A
ENERGY SAVING Per Day
2099 KWH 5363 KWH 2322 KWH
SAVING COST/Day @ Rs 5/-
10,494.00 26,818.00 11,658.00
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REDUCTION IN POWER CONSUMPTION
REDUCTION IN FEED FLOW
REDUCTION IN PUMP VIBRATIONS
REDUCTION OF NOISE IN RC PIPE LINE
ELIMINATING DAMAGING OF NRV
RESULTS
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Purchase of Spares including service chargesRs 40 Lakhs
Average Energy Loss/Year in RupeesRs 120 Lakhs
Pay Back period is with in 4 Months
Guarantee period of spares is one year
COST ANALYSIS
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CONCLUSIONThe BFP recirculation valve is one of the most severe duty valve in the plant.
If this valve does not perform up to expectations, it can cause severe pump damage, degraded unit performance or even bring a unit offline
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THANK YOU