JASC: Engineering actuators and fluid control components.

JASC Controls, Tempe AZ

Contact JASC  |  Career Openings

Menu
  • Home
  • About
    • 2025 Trade Shows and Conferences
    • JASC Career Opportunities
    • JASC Company Profile
    • JASC’s Founder
    • JASC Engineering
    • JASC’s Facility
    • JASC’s Customers
    • JASC’s Partner Alliances
    • JASC FAA & EASA Repair
    • JASC’s Continuous Improvement
    • Give Feedback to JASC
    • Close
  • Products
      • Power Generation
        • Fuel System Valves
          • Water Cooled Liquid Fuel Check ValveWater Cooled Liquid Fuel Check Valve
          • Liquid Fuel Check ValveLiquid Fuel Check Valve
          • Thermal Relief ValveThermal Relief Valve
          • Heatsink ClampHeatsink Clamp
        • Purge Air Valves
          • Purge Air Check ValvePurge Air Check Valve
        • Fuel and Purge Air Valve Systems
          • Water Cooled Three-Way Purge ValveWater Cooled Three-Way Purge Valve
          • Three-Way Purge ValveThree-Way Purge Valve
          • Water Cooled Combining ValveWater Cooled Combining Valve
        • Valve Monitor and Protection Systems
          • Fluid SentryFluid Sentry
        • Water Injection Valves
          • Water Injection Check ValveWater Injection Check Valve
          • F-Class Water Injection Check ValveF-Class Water Injection Check Valve
        • Sealing
          • Copper Crush GasketsCopper Crush Gaskets
          • High-Temperature Positional TeeSwivel Tee
          • Tube Adapter Tee for Standard Fuel NozzleSAE Fittings
        Close
      • Aerospace
        • Actuators
          • Inlet Guide Vane Actuator (IGVA)Inlet Guide Vane Actuator (IGVA)
          • FlexJet® Servo-Operated Pneumatic ActuatorsFlexJet® Servo-Operated Pneumatic Actuators
          • High-Temperature EM Rotary ActuatorHigh-Temperature EM Rotary Actuator
          • Common Hydraulic ActuatorCommon Hydraulic Actuator
        • Fluid Management
          • Fuel Metering Valve (FMVA)Fuel Metering Valve (FMVA)
          • Pressure RegulatorsPressure Regulators
          • Relief ValveRelief Valve
          • Flow DividersFlow Dividers
          • Smart Metering PumpsSmart Metering Pumps
          • Proportional Solenoid ValveProportional Solenoid Valve
          • Cavitating Pintle ValveCavitating Pintle Valve
          • Pintle Metering ValvePintle Metering Valve
          • Active Combustion Control ValvesActive Combustion Control Valves
          • Shuttle ValveShuttle Valve
        • Servo Valves
          • Single Stage Servo ValveSingle Stage Servo Valve
          • 3-Way Pressure Controlled Servo Valve3-Way Pressure Controlled Servo Valve
          • FlexJet® ServoFlexJet® Servo
          • FlexJet® Servo InteractiveFlexJet® Servo Interactive
          • High Temp Pneumatic 3-way Servo ValveHigh Temp Pneumatic 3-way Servo Valve
          • Metering Servo ValveMetering Servo Valve
          • Pneumatic Flapper Servo ValvesPneumatic Flapper Servo Valves
          • 4-way, Single Stage Servo Valve4-way, Single Stage Servo Valve
          • 4-way, 2 Stage Servo Valve4-way, 2 Stage Servo Valve
        • Close
      • Space
        • Actuators
          • Hydraulic Linear ActuatorHydraulic Linear Actuator
          • Thrust Vector Control ActuatorThrust Vector Control Actuator
          • Flight System Control ActuatorFlight System Control Actuator
          • Hydraulic Servo-ActuatorHydraulic Servo-Actuator
        • Fluid Management
          • Cavitating Pintle ValveCavitating Pintle Valve
        • Close
      • Product-Related Presentations
        • Industrial
          • Dual Fuel Reliability: Optimizing System Capability for Reducing Fuel and Maintenance Cost
        • Aerospace & Space
          • About JASC’s Air & Space
        • Close
    • Close
  • Services
    • Industrial Valve Refurbishment
    • Modeling & Analysis
    • Testing Capabilities
    • Precision Manufacturing
    • Dual Fuel Engine Upgrades
    • Close
  • Quality
    • Quality Statement
    • ISO/AS9100 Certification
    • Terms and Conditions
    • Close
  • Contact & Distributors
  • JASC Media
    • About JASC’s Air & Space
    • Understanding the Impact of Balance of Plant Equipment on Liquid Fuel System Reliability
    • JASC News
    • JASC Videos
    • JASC Resources
    • Close

Improve Gas Turbine Engine Reliability with Cool Valves and Piping

July 9, 2016

June 20, 2016 – Combined Cycle Journal

Presentations and discussion at meetings of the gas-turbine users’ groups, such as the 7F, often call into view problems owner/operators are having with the liquid-fuel systems on their dual-fuel engines—in particular, unreliable starts and unreliable fuel transfers from gas to oil. A couple of years ago, the sure solution for some users rarely called to operate on oil was to disable or remove their “unnecessary” liquid-fuel systems. A benefit of this approach was less-complex and less-costly annual inspections.

But yesterday is not today in the continually evolving business of electric generation. Many owner/operators, now unable to operate profitably on energy sales alone, must provide the grid ancillary services to boost revenue. Some of these services require dual-fuel capability to assure reliable power production on oil should gas supplies become tight, or unavailable—as happened in New England a couple of winters ago. Thus some users are re-commissioning their liquid-fuel systems; others are installing liquid-fuel capability on gas-only engines, and liquid-fuel systems are a headline item—once again.

Information shared at user-group meetings points to two ways to improve the reliability of dual-fuel gas turbines (GT) on oil starts and fuel transfers: Continuous circulation of oil through liquid-fuel-system components, and active cooling—including the use of water-cooled valves, manufactured by JASC (Tempe, Ariz), to prevent coking of oil in critical check valves and assure proper seating.

The coking problem many users experience with standard liquid-fuel check valves occurs after switching from oil to gas. Oil remaining in check valves, which is located close to the combustion section of the unit, is exposed to high temperatures. Above about 250F that oil is oxidized. The resulting coke coats check-valve internal surfaces (and fuel lines as well) and restricts the movement of valve parts and the flow of oil.

Once this occurs, a check valve will not open and close properly until it is overhauled, which requires special equipment and skilled technicians to assure its better-than ANSI Class 6 seal in the reverse-flow direction. The most common trip during fuel transfer is on high exhaust-spread temperature—caused almost exclusively by check valves “hung-up” on coked fuel.

To get a first-hand look at the issues faced by owner/operators with dual-fuel GTs, the editors recently spoke with a 7FA user who shared experience from a station equipped with five simple-cycle 7FAs and one 2 × 1 7FA-powered combined cycle. All engines at the facility are equipped for dual-fuel firing and have DLN2.6 combustion systems. Plus, all have JASC water-cooled liquid-fuel check valves—14 per GT (one per combustor). JASC valves were installed on the first engine at this site in 2006. Worldwide, more than 500 industrial gas turbines worldwide now are equipped with JASC water-cooled liquid-fuel valves…

Read the full article at Combined Cycle Online

Filed Under: 2016 News Archives, JASC News

Fill out my online form.

News Archive

  • 2021 News Archive
  • 2020 News Archives
  • 2019 News Archives
  • 2018 News Archives
  • 2017 News Archives
  • 2016 News Archives
  • 2015 News Archives
  • 2014 News Archives
  • 2013 News Archives
  • 2012 News Archives
  • 2000 – 2011 News Archives

Corporate Headquarters

2303 West Alameda Drive
Tempe, AZ 85282 USA

P: +1 602.438.4400

Sales:
sales@jasc-controls.com

Engineering:
engineering@jasc-controls.com

Connect With Us

Career Opportunities

World Wide Regions

Get Product Updates and News

Questions? Comments? Click here.

Information for Employees

Transparency in Coverage

Site Information

Terms and Conditions of Purchase

Privacy Policy

Terms of Use

Site by: Newhouse Studios

Copyright © 1992 – 2023 JASC All Rights Reserved

Improve Your Dual Fuel Engine's Performance

Would you like to improve the reliability of your dual fuel engine?

JASC can help. JASC has improved success rates to nearly 100% for dual fuel gas turbine engines throughout the world for over two decades.

For a limited time, JASC is offering free one-on-one consultations for dual fuel engine operators & owners to help them improve their engine's performance and reliability.

The information you submit to us will be handled and protected as set out in our Privacy Policy.