Turbine Bypass Valves - Mcilvainecompany
Turbine Bypass ValveSupplier Profiles\
logiesWeir
Bellino
Bellino is now manufacturing valves for anyservice in power generation.The range includes let down stationdesuperhater, bypass turbine for highmedium and low pressure and is focused onseveral services, starting from steamdesuperheating to boiler valves.Thanks to a peculiar body profile of thevalve, as well as to special steels andspecialized machining it is possible to obtainconstant thickness that reduces the effectscoming from mechanical and thermal stress.The range of products covers all the needs interms of steam desuperheating.
DFT
DFT , formerly known as Durabla Fluid Technology, has been makingin-line check valves and severe service control valves for over 70 years.It started with a customer’s need for a small metal-seated check valvethat could be installed in any position while providing tight shut-off.The Basic-Check valve was developed to satisfy that need. Over thefollowing decades, other customers’ needs led to the development ofthe ALC , BNC , DLC , DSV , Excalibur , FBC , GLC , GPV , PDC ,SCV , TLW and WLC styles of in-line silent axial flow check valves.Each of these DFT in-line check valves addresses the particular needsof today’s customer.
Emerson
By combining new advances in control technology, the TBX offersenhanced pressure reduction capabilities with highly efficient andmore accurate steam conditioning performance, all within a singleunit. The result: tighter pressure control, lower operating noiselevels, extended service life and improved temperature maintenance.Efficient Temperature Control: The TBX utilizes variable geometryspray nozzles to inject a fine mist into the downstream flow pattern.The nozzles are strategically placed around the valve’s outlet toensure a complete mixing and rapid vaporization of spray water forefficient and effective temperature control.Meeting Stringent Noise Limits: The TBX steam conditioning valveutilizes Fisher’s unique Whisper technology to provide noiseattenuation as much as 40 dB greater than what other quiet valvedesigns offer. It’s a difference that proves to be a significantoperating advantage when faced with strict fence line noise limits.
The rugged cage-guide design of the Fisher TBXenables it to handle full main steam pressuredrops, while Whisper Trim technologyeliminates the risk of excessive noise andvibration, which could cause structural damageand performance degradation. The valve’sproven and well-established Whisper Trim IIIcages and WhisperFlo trims help to attenuatenoise by up to 40 dBA.The Fisher TBX uses a thermally compensatedhung trim design which accommodates rapidchanges in temperature – as experienced duringa turbine trip – to enable smooth, continuousoperation. The cage is hardened for maximumlife and can expand freely during thermalexcursions. This prevents the valve plug fromsticking and therefore avoids delays in turbinestart-up. To prevent leakages affecting steamproduction when the turbine is operating, theFisher TBX uses Fisher Bore Seal Trimtechnology, which achieves tighter shut-off.
Bypass valves play a major role in the turbine bypass system. The valvesused in a 480 megawatt power plant had sticking and leakage problems forseveral years, requiring frequent maintenance and repair. Sticking valveswould cause delays in turbine startup and steam leaking into the condenserwas wasting energy and lowering condenser efficiency. It was thought thatthe leakage rate through these valves was exceeding Class II shutoff.Emerson engineers recommended that their new bore seal technology trimbe installed in the bypass valves and that larger actuators be installed onthree of the valves to increase the thrust for higher seat loads to meetClass V shutoff. Closure of the plug compresses the seal ring into a reducedbore in the cage, which is also above the flow ports. The compressed sealcreates radial sealing forces that prevent flow between the plug and cage.Converting the turbine bypass valves to the new bore seal design achieves aClass V rating with the expectation that they would not degrade below aClass IV rating for at least three years. Using a typical market rate of 100per MW-hr and running 330 days per year, estimated energy savings fromusing the bore seal trim is 425,000 per year.
GE
In 2010, Crystal River, an 860 MWE pressurized water nuclear reactor inoperation since 1977, was undergoing an extended power upgrade thatincluded a 20 percent power increase and 180 MWE of additional capacity.After a detailed technical comparison and evaluation, Dresser Masoneilanwas selected to provide the valves for the turbine bypass system.The company’s differentiated technologies, such as the SVI II AP digitalpositioner, form the ideal control valve solution for general service throughsevere service applications. Dresser Masoneilan is also able to providecustomers with technical expertise and support at the local level through itsglobal network of fully equipped aftermarket centers.
Unit 2A, A B Hopkins Generating StationCommercial operating date: June 2008EPC contractor: BE&K IncOwner’s engineer: Sargent & LundyType of plant: Combined cycleKey personnelManager of power production: Robert E McGarrahPlant manager: Triveni SinghAsst plant manager: Clark K SheehanManufacturer: GE EnergyNumber of machines: 1Model: 7FA e (7241)Control system: Mark VICombustion system: DLN 2.6Fuel: Dual fuel (natural gas and distillate)Control system: Emerson Process Management (Ovation)Attemperator: CCI-Control Components IncDuct burner: John Zink CoSCR: Vector Systems IncCatalyst supplier: Cormetech IncSteam-turbine bypass valve/desuperheater: Dresser Inc(Masoneilan)Water treatment
A workshop on optimization of steam-turbine bypasssystems at the 2018 meeting of the Australasian Boilerand HRSG Users Group, led by Bob Anderson,Competitive Power Resources Corp, covered thearrangement, purpose, and methods for operating andmaintaining this equipment.Vibrant discussion followed presentations by Anderson,Justin Goodwin of Emerson/Fisher, Ory Selzer of IMI CCI,and Sanjay Sherikar of Nihon Koso Co Ltd.Problems include Leakage Sticking valve plugs Noise
IMI
IMI Supplies Valves from 4” to 32”
The HP-Bypass Valve Type ARS is a steamconditioning valve. It is used for steamthrottling with very high pressure dropcombined with in-body desuperheatingthrough spraywater injection. Its prime areaof application is high pressure bypasssystems for fossil-fired power plants withsubcritical as well as supercritical steamconditions. With the range of body materialsavailable, the ARS valve can be applied formain steam pressures and temperatures oftoday’s most advanced thermal powerplants. The valve is specially designed forthe cyclic operation of bypass systems.Equipped with a hydraulic actuator and thenecessary safety control devices the valvecan be used as a combined HP-Bypass andsuperheater safety valve in accordance withEN4126-5 (TRD 421). The complete systemhas a type approval for this application.
Compact, robust designBonnet and bolting on low pressure sideOptimized body shape for minimal thermal stressMulti-function contoured cage eliminates thermalshocksWing type stemTight shut-off (EN 12266-1 Cl. B or MSSSP61 orANSI/FCI 70.2 Cl. V)Wide installed baseIntegral desuperheating; water injection in area ofhighest turbulence ensures:Optimal mixing of steam and waterVery short necessary straight pipe length after thevalve (approx. 1m)ARS HighPressureUtility
In 2015 IMI Critical Engineering, manufactured a turbinebypass valve for a 1,050-MW supercritical thermal powerplant, the first of its kind ever produced in India.IMI CCI Japan, part of IMI Critical Engineering, wasapproached by a Japanese engineering, procurement, andconstruction (EPC) company to work on the project. Thecontract required IMI CCI Japan to supply eight sets of lowpressure turbine bypass isolation and control valves, each witha capacity of 1,050-MW.While the assembly and testing of the turbine bypass valveswas undertaken at IMI CCI Japan, IMI CCI Sri City was chosenas the manufacturing facility for the valve body (including allwelding and de-superheater), fully machined internals, andthe bonnet. The project was successfully delivered to anexacting client specification.
AB6350 for CHP plantsIMI CCI Japan has over 40 years ofexperience to deliver integratedcontrol valves and desuperheaters forturbine bypass and steam conditioningvalves. In total, they have deliveredmore than 1,500 units of AB6000 seriesall over the world.AB6350 is a new design model of theAB6300 series for small Combined Heatand Power (CHP) applications. TheAB6350 is designed to perfectly matchpower plants like incineration powerplants, biomass power plants, andother small co-generation powerplants.
In order to achieve the most sophisticated design of theintegrated turbine bypass system, AB6350 has thefollowing key features.ActuatorMulti-spring diaphragmPistonElectricHydraulicCage, trim and seatMulti-hole cageBalanced trim with graphite balance sealQuick change seat with graphite sealDesuperheaterSteam atomizingAccessoriesA full range of accessories are available to meetrequirements
IMI Turbine Bypass Valves for Smaller Power Plants
SPX : Copes Vulcan
The Copes-Vulcan Pressure Reducing and Desuperheating Valve known asthe DSCV-SA, is of angle style construction with the steam inlet throughthe branch connection and the steam outlet through the in-lineconnection. The connections can be either flanged or butt weldeddepending upon the customer preference.The units are manufactured in two parts to allow for greater customerflexibility. The high pressure side of the unit is of cast or forgedconstruction with the lower pressure outlet section being of fabricatedconstruction. The valve is provided with a bolted bonnet closure forpressure ratings up to and including ANSI 900# and a pressure sealclosure for ratings ANSI 1500# up to and including ANSI 4500# rating.The valve can be fitted with single stage HUSH, multi stage HUSH orCopes-Vulcan RAVEN trim technology depending upon the pressure dropand to meet the requirements of specific noise levels. The valve isprovided with high pressure balancing, single seat trim constructionutilizing a tandem trim pilot operated concept ensuring tight andrepeatable class V shutoff per ANSI/FCI 70-2.
The DSCV-SA is available in an almost infinite range ofsizes as each valve is tailored to suit a particularcustomer’s requests and requirements. AdditionalNoise Attenuation can be performed by utilizing aspecifically engineered RAVEN multi-labyrinth trimdesign utilizing upon 18 stages of pressure reduction.Pressure Ratings: The DSCV-SA valve can be fully orsplit rated design and available in standard, special orintermediate class. Standard classes are available upto and including ANSI 4500#, intermediate and specialclass designs can be accommodated were required.Maintenance: The DSCV-SA is not a high maintenancevalve. However, the complete trim is a ‘Quick-Change’style with no welded in components or large internalthreaded parts. The whole trim assembly is held incompression by either a compression ring or thebonnet. By simply removing the compression ring orbonnet the whole trim merely slides out of the top ofthe valve.
Trimteck
WeirTurbine BypassValves
The Weir BV995 Turbine Bypass Valve is a highly sophisticated engineered control device.Conceptually, it is required to accurately control multiple operational variables, provide systemprotection to both upstream and downstream plant components, and sometimes perform thesetasks all in a fraction of a second. Depending on the overall system size, bypass mode ofoperation and customer preference, there is almost an endless selection of options andconfigurations that can be applied to the BV995 bypass valve construction. The Weir BV995Turbine Bypass Valve design can be varied to accommodate the particular plant design, size, andapplication. It is available in a range of options and configurations to assure optimumperformance regardless of the mode of operation.The high pressure (HP) bypass valves are subject to some of the highest pressures andtemperatures. They may be utilized in either a Parallel or Cascading Bypass System. If the plant isconfigured in a Parallel arrangement, the HP Bypass Valve will direct the outlet steam flow to thecondenser. If the plant is configured as a Cascading system (the most common in today’s plants) thesteam will be directed to the Cold Reheat section of the boiler or steam generator. Regardless, thesevalves will warrant the highest pressure ratings which may go as high as ASME 4500. The valves arecommonly manufactured from forged materials which allow for higher strength and ductility whencompared to the equivalent cast material. The additional strength of the forged materials alsoprovide greater manufacturing flexibility which allows for optimized contours and shapes that canresult in thinner wall sections being applied to the valve body design. This helps in reducing theeffect of thermal gradient stress across the body caused by the rapid and sudden opening of the valveduring a turbine trip sequence
The Hot Reheat (HRH) bypass valves (sometimes referred to as Intermediate or MediumPressure) are used to bypass steam to the condenser regardless of whether the bypass systemis configured as parallel or cascading. The required flow coefficient, Cv, for these valves isoften the largest in the system due to the combination of lower steam pressures and highertemperatures emanating from the re-heater. They are used to convert the HRH steam toconditions more acceptable for admission into the condenser. As a result of the high steamtemperatures entering these valves, they normally require a significant amount ofdesuperheating flow to reduce the outlet enthalpy to acceptable condenser inlet conditions.The low pressure bypass valve is used to bypass the LP section of the turbine and also directsits steam discharge to the condenser. The low pressure valves are not subject to extremes ofheat and pressure in the same way as the HP and HRH bypass valves. They are thereforemostly made from lower grade cast materials such as ASTM/ASME SA216 WCB or carbon steelforgings such as ASTM/ASME SA A105. Due to the lower inlet pressures and temperatures, theLP bypass design criteria are not as difficult and there are many possible valve solutions andconfigurations for this application.
Spray Nozzles For turbine bypass applications, the most common nozzle usedwith the Weir Bypass valves is the BV984-VG (Variable Geometry) nozzle. It is aback pressure activated, variable geometry injection device. Depending on thespray water requirements, a number of nozzles are located radially around theoutlet pipe. Selecting the right number of nozzles with a suitable pressure dropacross each nozzle is crucial to obtaining an efficient spray injection pattern inthe valve outlet. The number and location of the nozzles is critical to assuregood spray penetration, complete flow area coverage, and minimize theformation of thermal stratification, a problem particularly prone in largediameter pipelinesBonnents: In the design of any pressure vessel, there will always be a requirementto allow access to the inside of the component via the penetration of the pressureretaining boundary. In the case of a turbine bypass valve, this is usually facilitatedby the valves bonnet. Under pressurized or operational conditions, the bonnetserves the same purpose as the vessel wall in securely containing the pressure andflow. However, when it is time for inspection or maintenance, the bonnet can beremoved and access to the valve trim and seat can be afforded. Depending on thesystem pressures, valve size, and customer preference there are two main bonnetdesigns that are quite typical for turbine bypass valves. These are: „Bolted Mechanical Bonnet Pressure Seal or Pressure Assisted Bonnet
Weir Bonnet Options
Valve Materials of Construction
Weir BlakeBoroughTurbine BypassValveFeatures
After a detailed technical comparison and evaluation, Dresser Masoneilan was selected to provide the valves for the turbine bypass system. The company’s differentiated technologies, such as the SVI II AP digital positioner, form the ideal control valve solution for
Bypass Valve * (4)* INSTALLATION USING 3 - VALVE BYPASS (BRINE TANK NOT SHOWN) BypASS,I[J I I 'r!!J _ va,ver OUTLET valve INLET valve I for soft water SERVICE: - Open the inlet and outle valves, - Close the bypass valve. for hard water BYPASS: - Close the Inlet and outlet valves. - Open the bypass valve. * included with softener .
desuperheating of steam that has been produced by the boiler but, due to transient or unexpected conditions, can not flow through the turbine. The percentage of total steam handled by the turbine bypass system depends on plant design philosophy. Capacity usually ranges between 30% up to 100% of the maximum continuous rating (MCR) boiler steam flow.
AUTO BYPASS CONTROL: Bypass panel will automatically switch motor over to bypass starter if VFD faults. Bypass can also be selected remotely via contact closure on bypass panel terminals 6 & 7. Jumper J2 on bypass panel terminals 4 & 5 must remain in place for auto bypass operation. Removing jumper J2 sets byp
5 Resource Title: CCI Getting Reliable Turbine Bypass Performance in Cycling Power Plants Location: GdPS for CCGT Valve Selection Keyword: Turbine-Bypass Discussion: Contributing factors to problems in turbine bypass systems were traced to faulty control algorithms,
4 Section Pages Argus Atomac Automax Deutsche Audco Durco McCANNA 3-Piece Ball Valves 6 - 9 One Piece Threaded Valves 9 Flanged Ball Valves 10 - 14 One-Piece Butt Weld Valves 15 Top Entry Valves 15 Butterfly Valves 16 Non-lubricated Plug Valves 17 - 19 Lined Valves and Accessories 20 - 24 Check Valves 25 Gate Valves 25 Rotary Contro
MANUAL VALVES PVC-U The PVC-U manual valves line consists of a comprehensive range of ball valves, butterfly valves, diaphragm valves, check valves, sediment strainers, air release valves, foot valves and angle seat valves for use in the construction of process and service lines fo
FC & FL valves, WKM type valves, Shaffer type valves, Flocon type valves, check valves, cup testers, pulsation dampeners: www.mcmoiltools.com o’Drill / mCm Centrifugal pumps, cyclone pump, skid packages, gate valves, shear relief valves, reset relief valves, float valves, butterfly valves, plug
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