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Combined Cycle Gas Turbine Valve Markets, Issues and Options
Valve suppliers can supply more than just valves. Total Solutions provide packages based on needs which are specific to processes and industries. This addition of Total Solutions to the revenue base adds more than $700 million to the annual market. GTCC plants have many special issues such as fast start HRSGS. They create unique requirements for valve design. A decision guide on GTCC valves is a gateway to the entire database on the subject.
Revision Date: 7/13/2015
Tags: 221118 - Other Electric Power , McIlvaine, KCI Technologies, Valve, High Performance Valve
HVOF Coating Case Study for Power Plant Process Control Ball Valve Applications
This is a case study of the failure of the coating on an on-off metal-seated ball valve (MSBV) used in supercritical steam lines in a power plant. The valves are exposed to rapid high-pressure and -temperature variations resulting in cracking and cohesive failure of the high velocity oxygen fuel (HVOF) 80/20 Cr3C2-NiCr coating. It was found that carbide precipitation is a major factor causing embrittlement of the coating.
Revision Date: 6/8/2015
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Velan, Valve, Thermal Stress, Journal of Thermal Spray Technology
GTCC Valves Decision Guide by Bob McIlvaine - Hot Topic Hour June 4, 2015
Power Point sequence used as a basis for the discussion in the June 4 Webinar.
Revision Date: 6/4/2015
Tags: 221112 - Fossil Fuel 化石燃料, Valve
Cost Benefits of Critical Valve Repair in the Heat Recovery Steam Generator
Modern advance frame combined-cycle power facilities operate in a dispatch environment where cold starts, accelerated ramp rates and low load conditions are the norm and where Balance of Plant (BOP) equipment accounts for more than half of all forced outages. An analysis by Pentair revealed that valves are a significant contributing factor in forced outages, primarily based on their application numbers and the severity of their service applications. This article focuses on small bore vent valves and drain valves, reporting research findings that repairing these valves is more prudent and economical than replacing them.
Revision Date: 6/3/2015
Tags: 221112 - Fossil Fuel 化石燃料, Pentair, Heat Recovery Steam Generator, Valve, Life Cycle Cost, Optimization, Service & Repair, Heat Recovery, Fast Start, Power Engineering
Desuperheating Valves Take the Heat
A cascading bypass system uses an high pressure (HP) steam bypass valve and a hot reheat (HRH) steam bypass valve to manage steam flow to the steam turbine. The HRH bypass valve actuator determines the valve’s ability to respond to system demands. This article discusses the selection of HRH valves and actuators, and the corresponding impact on other plant components.
Revision Date: 6/3/2015
Tags: 221112 - Fossil Fuel 化石燃料, KOSO, Actuator, Valve, High Performance Valve, Reheat, Power Magazine
Converting from Hydraulic to All-Electric Gas Control Valves Benefits Frame 6 Owners
Young & Franklin valves have been in use on Frame 6 gas turbines for a decade. One advantage of an all-electric control valve is that it eliminates varnish issues by eliminating the control oil required by hydraulic actuators. Plus, electric valves are more responsive than hydraulically operated valves, have greater range, are easier to maintain, and enhance plant safety.
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Young & Franklin, Valve, Fuel System, Combined Cycle Journal
Gas Turbine Electric Valve Actuators
In order to deliver efficient and dependable gas turbine performance with low operating and maintenance costs, manufacturers and retrofitters are turning to all electric servo solutions for their actuator needs, eliminating the need for pumps and tubing normally associated with hydro-mechanical or pneumatic designs.
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Exlar, Valve, Actuator
Integrated Fuel Valve (IFV) Gas Fuel System Upgrade
Siemens Industrial Turbomachinery has recently introduced an upgrade to the gas fuel system for industrial gas turbines up to 15 MW. The upgrade incorporates an Integrated Fuel Valve (IFV) assembly and, where applicable, pneumatically actuated fast acting double block and vent valves.
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Siemens, Valve, Fuel System
Keeping Motion Control Systems Operating is Critical for CCGT
The challenge for power plants is keeping their critical motion control systems operating at the same high level as the original equipment in spite of 24/7 operations in rugged environments. Moog provides actuators and servo valves to most OEMs of gas and steam turbine equipment and works with the designers of new turbines to develop specifications. In addition, Moog provides Global Support repair and maintenance services and offers special services to help power plants minimize downtime and ensure optimized performance
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Moog, Inc./ Ind'l. Controls Div., Valve, Actuator, Maintenance, Service & Repair, Motion Control
Eliminate Leakage by Drain, Vent, Block Valves
Select your valves carefully. Be sure metal seats are available when service temperatures are 400F and above, stems are blowout-proof, seat leakage meets the tightest specs after installation, coatings assure long life, and can be accessed internally, inline, for inspection and maintenance.
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Valve, Leakage, Maintenance, Combined Cycle Journal
Electric Fuel Control Valve Streamlines Plant Operations
A Frame 6B-powered cogen plant in California was plagued with fuel-gas valve problems, usually requiring at least a man-shift’s worth of work each outage to disassemble, clean seats/plugs, and reassemble. One solution is to reheat the fuel gas to above the dew point (120-130F) in between the valves, but this is considered far from ideal. The better solution proved to be replacing the original valve with a “smart” electric control valve in the same location as the original and a separate solenoid-operated stop/isolation valve about 6 ft upstream—just outside and below the turbine enclosure.
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Fuel System, Valve, Maintenance, Combined Cycle Journal, USA
Water-Cooled Check Valves Boost Reliability of 7FA Liquid Fuel System
Owners/operators of dual-fuel gas turbines often experience coking problems with standard liquid-fuel check valves. After switching from oil to gas, the oil remaining in check valves, which are located close to the combustors, is exposed to high temperature. Water-cooled check valves for the liquid-fuel circuit can help to alleviate the problem.
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Jasc-Controls, Valve, Fuel System, Dual-fuel, Coking, Combined Cycle Journal
Continuous-Blowdown Block Valve Reduces Startup Time
At Essential Power LLC’s Newington Energy Facility, the high-pressure (HP) steam-drum continuous blowdown system was designed to cascade flow to the intermediate-pressure (IP) steam drum. While the valve worked well for controlling flow, it did not have the degree of leak-tightness required for stopping flow from the drum during typical overnight shutdowns. An automatic full-port ball valve was installed upstream from the existing automatic control valve to eliminate the risk of flashing.
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Valve, Leakage, Combined Cycle Journal, USA
Inspect Steam Valves for Stellite Delamination
Stellite liberation from large valves installed in high-pressure (HP) and hot reheat (HRH) steam systems serving F-class combined cycles has emerged as an important industry concern. EPRI has established a committee on “Cracking and Disbonding of Hardfacing Alloys in Combined-Cycle Plant Valves” to dig into the details. The work, funded by several sponsors, began early this year. John Shingledecker (jshingledecker@epri.com), the technical manager for this program, said the project timeline is estimated at 14 months.
Revision Date: 5/21/2015
Tags: EPRI, Structural Integrity Associates, Valve, Maintenance, Delamination, Combined Cycle Journal
Fisher Offers Full Range of Control Valves for Power Plant Applications
Fisher offers a full range of control valves for conventional, as well as combined cycle, power plants.
Revision Date: 4/22/2015
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Fisher Company, Emerson Process Management, Valve, Schematic, Flow Control
KSB Offers Full Range of Control Valves for Power Plant Applications
KSB offers a full range of control valves for conventional, as well as combined cycle, power plants.
Revision Date: 4/22/2015
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, KSB, Valve, Schematic, Flow Control
Flowserve Offers Full Range of Control Valves for Power Plant Applications
Flowserve offers a full range of control valves for conventional, as well as combined cycle, power plants.
Revision Date: 4/22/2015
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Flowserve, Valve, Flow Control
High-Pressure Valves: Why you should buy only premium valves
This case study reviews the process of replacing a main steam valve for an F-class heat recovery steam generator (HRSG), including step-by-step photos. Given the extensive and expensive effort involved, the author suggests that HRSG valve selections consider quality and not just cost.
Revision Date: 4/22/2015
Tags: 221112 - Fossil Fuel 化石燃料, Bremco, Control Valve, Heat Recovery Steam Generator, Valve, Maintenance, Flow Control, Combined Cycle Journal
Power Industry Application Guide
This application guide discusses control valves used by simple cycle and combined cycle power plants as well as conventional thermal power plants. The document contains detailed flow diagrams and valve selection guidelines.
Revision Date: 4/13/2015
Tags: 221112 - Fossil Fuel 化石燃料, Submersible Pumps , Leslie Controls, Valve, Schematic, Flow Control
Coal to Natural Gas Electric Utilities Repowering: Consequences for Valve Usage and Replacement
US power generating plants are converting from coal to other fuels in large numbers. In some cases the existing infrastructure is (to the extent possible) retained, with only the combustible material being altered. In the “middle” are plants that "repower" by using an existing turbine to run on steam from a heat recovery steam generator (HRSG) that draws (recycles) exhaust heat from a new gas turbine, together forming a combined cycle. At the other end of the scale are newly constructed power plants, which are predominantly gas-fueled. Each of these three repowering alternatives requires a different quantity of new valves, often of varying types.
Revision Date: 9/10/2014
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Crane, Valve, Repower, Fuel Switching
This case study describes a sky vent solution for a heat recovery steam generator (HRSG) which addresses noise and vibration concerns at a combined cycle power plant in Texas. The solution incorporated a whisper Trim III noise attenuating flow cage along with a downstream diffuser.
Revision Date: 9/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Emerson Process Management, Sargent & Lundy, Heat Recovery Steam Generator, Control Valve, Valve, Noise, Vibration, USA
Tenaska Lindsay Hill Generating Station Ammonia Pump Problem
The facility’s anhydrous-ammonia forwarding pumps did not allow for double-valve isolation during maintenance. These pumps are only required for use on very cold days. This requires additional maintenance and laying them up for periods of non-use. The system had single-valve isolation from the ammonia storage tank to the suction of the pumps, a potential safety risk for the O&M team.Solution. Plant management decided to install double-block-and-bleed capabilities to the liquid suction line from the storage tank and liquid return line to the storage tank
Revision Date: 8/7/2014
Tags: Tenaska, Ammonia, Pump, Valve, Maintenance, Safety, Combined Cycle Journal, USA
Sky-vent system from Emerson insures temperature control of turbine during startup
Valves within the sky vent system of a combined cycle plant serve one of the more important control functions. During initial operation of the HRSG, these valves bypass steam (HP/HRH/LP) around the steam turbine to ensure that the unit doesn't come up to temperature too quickly. This is done as the process lines are warmed prior to admitting steam through the turbine bypass valves that dump to the condenser.
Revision Date: 6/10/2014
Tags: 221112 - Fossil Fuel 化石燃料, Emerson Process Management, Control Valve, Heat Recovery Steam Generator, Valve
Mogas HRSG valves depicted in schematic
Mogas has identified the key locations where their valves are used in HRSG systems.
Revision Date: 6/10/2014
Tags: 221112 - Fossil Fuel 化石燃料, Mogas Industries, Heat Recovery Steam Generator, Valve, Schematic
DFT Has Range of Valves for CCGT- Jeff Kane
This chart shows the valve products offered by DFT and their applications.
Revision Date: 6/2/2014
Tags: 221112 - Fossil Fuel 化石燃料, DFT, Valve, High Performance Valve, Flow Control
Coking Eliminated with JASC Solution- Schyler McElrath
JASC solutions for gas turbine back up liquid fuel systems are operating at better than 98% reliability and availability. As turbine efficiency continues to rise and combustion hardware maintenance intervals increase, fuel control technology must also continue to improve. Innovations such as the water cooled liquid fuel check valve, water cooled 3-way purge valve, combining valve and Smart Fluid Monitor were designed to provide options which are appropriate for any gas turbine system application or operational parameter
Revision Date: 6/2/2014
Tags: 221112 - Fossil Fuel 化石燃料, Jansen’s Aircraft Systems Controls (JASC), Valve, Flow Control
Winn Butterfly Valves for Condensate Polishing at Chinese Gas Turbine Plant
With the availability of water determining the potential for power station development in China, Winn Hi-Seal high performance butterfly valves from Pentair are helping to satisfy the country's growing demand for electricity. Christ-Kennicott Water Technology Ltd lent its expertise to the project, supplying the equipment that removes potentially harmful contaminants from the water used in the thermal gas turbine plants.
Revision Date: 5/27/2014
Tags: 221112 - Fossil Fuel 化石燃料, Pentair, Christ-Kennicott Water Technology, Valve, Condensate Polishing, China
NV Energy Coping with Stellite Delamination
CCJ editors participated in a round table with NV Energy personnel to discuss the first gas-turbine major inspection at its Walter M Higgins Generating Station. Higgins is a 2 x 1 combined cycle powered by 501FD2 gas turbines from Siemens Energy Inc. The roundtable covered a number of issues including large steam valves.
Revision Date: 2/11/2014
Tags: 221112 - Fossil Fuel 化石燃料, Siemens, NV Energy, Gas Turbine, Valve, High Performance Valve, Delamination, Flow Control, Combined Cycle Journal, USA
Woodward Supplies Gas Control Valves for Heavy Frame Gas Turbines
Woodward supplies gas control valves for heavy frame gas turbines. Fuel control valves are available in several sizes with either hydraulic or electric actuation. The integrated valve/actuator contains options for high-temperature applications, hydraulic or electric trips, and a variety of flow capacities. A separate valve is available to control the system fuel pressure upstream from the main control valves.
Revision Date: 1/20/2014
Tags: 221112 - Fossil Fuel 化石燃料, Woodward, Valve, Actuator, Flow Control
Severe Service Control Valves by Ory Selzer, CCI - Hot Topic Hour June 2, 2011
Ory Selzer, Valve Doctor - Power, Americas at CCI -Control Components, Inc, described the important requirements of severe service control valves, as they apply to steam and water.
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, CCI, Ball Valve, Valve, Erosion, Cavitation, Corrosion, Noise, Vibration, Flow Control
Valves for Power Plant Steam and Water Applications Webinar - Hot Topic Hour June 2, 2011
The speakers addressed issues for the various valve applications in power plant steam and water systems. Password: hth484
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Crane Energy Flow Solutions, CCI, Weir Valves & Controls, Valve, Corrosion, Erosion, Vibration, Noise, Cavitation, Flow Control
Donald Johnson of CRANE ChemPharma Flow Solutions & CRANE Energy Flow Solutions stated that pressure locking and thermal binding solutions are important for wedge gate and parallel slide gate valves.
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Crane Energy Flow Solutions, Valve, Corrosion, Erosion, Vibration, Noise, Cavitation, Flow Control
Severe Service Control Valves by Ory Selzer, CCI Valve - Hot Topic Hour June 2, 2011
Ory Selzer, Valve Doctor - Power, Americas at CCI -Control Components, Inc, described the important requirements of severe service control valves as they apply to steam and water.
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, CCI, Valve, Corrosion, Erosion, Vibration, Noise, Cavitation, Flow Control
Donald Bowers, Vice-President, Sales & Marketing at Weir Valves & Controls, discussed the challenges of Center Cavity over Pressurization (CCOP) that can cause Pressure Locking (PL) and Thermal Binding.
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Weir Valves & Controls, Valve, Corrosion, Erosion, Vibration, Noise, Cavitation, Flow Control