Ralston Instruments PSV test suite

In the past, it was difficult to test pressure safety valves (PSVs) because a digital gauge, a steam or gas source and a clipboard were needed. With the Ralston Instruments PSV test suite of software and hardware, it is possible to conduct the test and record most of the information on the calibrator.

The PSV test mode captures the PSV crack and reseat pressure by logging pressure at 128 times per second. The PSV mode also allows the user to select from standards such as ASME Boiler Code Section 8, simple crack tests or conditional crack tests where the allowable error may depend on the pressure of the PSV. The user can enter the pressure of the valve at the time of test and type in any other important information on the FieldLab equipment. When the user returns to the office, they can download all the relevant information and create the certificates.

The PSV test mode works with steam and gas valves as well as liquid valves, where the user needs to witness the first steady stream of liquid prior to recording the crack pressure. It also has the option of running a leak test and logging the change in pressure and whether any leakage was observed.

The FieldLab is available from 200 kPa to 70 MPa, so it covers the ranges of most PSVs in the field. It is also IECEx rated Ex ia IIC T4 Ga (-10 to +50°C).