With the Ralston Instruments PSV Test suite of software and hardware, it is said to be possible to conduct the test and record most of the information on a FieldLab calibrator. After the test is completed the data is then transferred electronically to a PC where a certificate with graphs, customer data, tag data and other required information can be created.
The unique PSV test mode captures the PSV crack and reseat pressure by logging pressure at 128 times per second. Most competitors’ devices do not reliably capture the crack and reseat because the logging rate is too slow, the company says.
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 right on the FieldLab. Thus, when the user returns to the office they can download all important information and create the certificates without a lot of extra effort.
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 30 psi to 10,000 psi so it covers the ranges of most PSVs in the field. It is also rated Class 1, Division 1 Intrinsically save (-10 < Ta < 50 °C) to CSA standards.
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