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Steam Turbine High Pressure Fluid System Upgrade Products

THE S-BLOCK

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Description

The S-Block is used in conjunction with the Test Solenoid Valve on Non-Servo Controlled Hydraulic Actuators.

The S-Block provides the critical diagnostics needed for reliable predictive maintenance of the hydraulic actuators and their components.

The S-Block provides the following diagnostic variables to the local HMI display:

  • Test Solenoid flows
  • Pressure indication before the Test Solenoid Valve
  • Pressure indication after the Test Solenoid Valve

In addition to the above diagnostic, The S-Block also has an isolation ball valve that allows for complete hydraulic isolation of the Test Solenoid for on-line service and/or replacement of this device.

The S-BLOCK consists of two major subassemblies: the hydraulic isolator and the diagnostics.

HYDRAULIC ISOLATOR

The S-BLOCK incorporates a Hydraulic Isolation valve, which allows for the complete removal and replacement of the Test Solenoid Valve on a non-servo controlled hydraulic actuator with the unit on-line.

In order to isolate all of the hydraulic fluid from the Test Solenoid Valve, the main fluid supply to the Test Solenoid Valve must be shut off with assurances that no pressure exists either to or from the Test Solenoid Valve.

By isolating the main pressure supply, the Test Solenoid Valve is hydraulically isolated from the high-pressure fluid system and can be safely removed.

The S-BLOCK incorporates a manual lockable isolation valve, which is capable of completely shutting off all of the hydraulic fluid to the Test Solenoid Valve.

In order to verify there is no fluid pressure on any of the Test Solenoid Valve ports, a series of test points and transducers are attached to The S-BLOCK that allow pressure gauges and pressure transducers to be attached to visually check for pressure.

DIAGNOSTICS

The following transducers are incorporated into the S-Block to provide real time data to aid in predictive maintenance of the hydraulic actuator, it components and the steam valve associate with the actuator.

  • Port A Pressure
    This transducer provides pressure indication on the discharge of the Test Solenoid Valve (the pressure under the hydraulic actuator). The pressure transducer displays this pressure on the optional HMI display. When compared to actual valve lift, it provides an accurate indication of the condition of the hydraulic actuator and steam valve. A pressure gauge can be connected to the test point associated with this transducer to verify this pressure. A snubber valve is included on this line to provide a smooth pressure signal to the pressure transducer. The snubber valve can also be completely closed, and a known pressure source can be connected to the test point to allow for on-line verification of the transducer signal. The pressure transducer can also be removed and replaced with the snubber valve closed for on-line service of this component.
  • Test Solenoid Valve Inlet Pressure
    This transducer provides pressure indications of the system pressure between the S-Block isolation valve discharge and the inlet of the Test Solenoid Valve. The pressure transducer displays this pressure on the optional HMI display screen. A pressure gauge can be connected to this test point. This pressure indication is used to verify there is no pressure being supplied to the Test Solenoid Valve. A snubber valve is included on this line to provide a smooth pressure signal to the pressure transducer. The snubber valve can also be completely closed, and a known pressure source can be connected to the test point to allow for on-line verification of the pressure transducer. The pressure transducer can also be removed and replaced with the snubber valve closed for on-line service of this component.

FLOW TRANSDUCER      FLOW METER Test Solenoid Valve Flow (gpm).
This transducer provides and accurate (+/- 0.2 gpm) indication of the fluid flow through the Test Solenoid Valve. This value is indicated on the optional HMI display. If a steady state flow of 1.0 gpm or greater is observed, this indicates potential excessive leakage from either the Test Solenoid Valve or the hydraulic cylinder. Normal steady state leakage should be between 0.2 and 0.4 gpm. In order to replace the flow transducer on-line, the hydraulic fluid pressure needs to be totally isolated, similar to the requirements for removing a servo valve described later in this publication.

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