Partial Impact Test for ISA 96-05 Valve Actuators

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISA 96-05 test. The ISA 96.05 standard provides guidelines for performing a partial stroke test (PST) on valve actuators. PST is a test method used to verify that a valve actuator is operating properly without fully closing or opening the valve. By performing a partial stroke test, it can be checked whether the valve and actuator are working properly while the process is running.

The limit of the automatic valve includes:

• Limit switches and other monitoring devices;
• Air regulation and filtration system;
• Valve actuator whose fault location is specified as spring return fault closed, spring return fault open or double acting;
• Valve body specified to meet functional requirements for its application.

The standard defines a partial stroke test as "the act of moving the valve from its normal operating position to the intermediate position and then returning the valve to its normal operating position without fully closing or opening the valve".

Some basic terms and definitions in the standard are:

• Partial stroke test: The act of moving a valve from its normal operating position to the intermediate position and then returning it to its normal operating position without fully closing or opening the valve.
• Intermediate position: The position between the normal operating position and the fully closed or fully open position.
• Limit switch: A switch that detects when the valve has reached the intermediate position.
• Test frequency: The frequency at which the partial stroke test is performed.
• Test procedure: The procedure used to perform a partial stroke test.
• Test report: A report documenting the results of the partial impact test.

By following the guidelines set out in the ISA 96.05 standard, valve and actuator performance can be verified while the process is running. This helps ensure the safety and reliability of the process by identifying potential issues before they become major issues.

EUROLAB assists manufacturers with ISA 96-05 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.