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Frequently asked questions


Frequently asked questions

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There are two ways to test the seat tightness with the Inline X test unit: The traditional bubble counting, as stated in the API 527, is done digitally with an optical sensor that can register more than 1,000 bubbles per minute. This is more than five times the maximum allowed leakage.

It is also possible to look at the pressure drop over time to determine if the PSV holds the pressure at 90% of the set pressure. While not as accurate, it is more than sufficient to specify if there is leakage through the seat of the PSV.

Using the Inline X technology, PSVs can be tested more frequently to better understand when it is necessary to dismount and perform a visual inspection and overhaul. All the data needed to make decisions about test intervals is available in the web application.

With the Inline X test unit, the functionality of the PSV and the status of the surrounding pipe segments are tested, but it cannot perform an internal   visual inspection of the PSV.

Yes. When performing the seat leakage test and set pressure test through building pressure on the inlet side of the PSV, pilot, conventional and bellows PSVs can be tested. Even vacuum PSVs can be tested with an additional test kit.

The Inline X test unit is connected to the internet via 4G or WiFi. The PSV data is imported to the Inline X web application and then synchronizes with the test unit. If no internet connection is available, it is possible to transfer data using a mobile device.


The Inline X test unit is always connected to a safe location. This applies to both leakage from the inlet isolation valve and to the test medium used. The pressure built up in the inlet volume of the PSV will be drained through the unit and into the safe location.

The API standards and recommended practices are the basis for the Inline X test method. The tests performed in situ will give the same information as you get from testing the PSV in a workshop, while also getting an indication of any leakage in the Isolation valves.

At this stage, the Inline X technology should be seen as a part of the PSV maintenance regime that ensures full knowledge about the status of all PSVs across an asset. Inline X provides an innovative and more reasonable method for PSV testing, through a complete history of tests, overhauls, and degradation.  

At some point, all PSVs should be dismounted to perform a visual inspection and service.


Our technology is well suited for all types of campaign based PSV testing. The equipment is mobile and can be used whithout shutting down the process