PREVENTEST NEXUS
IN-SITU PRESSURE RELIEF/SAFETY VALVE TESTING
RISK BASED MAINTENANCE
The most cost effective maintenance strategy for pressure relief valves is a risk based approach to determine maintenance intervals between turnarounds. It requires periodic calibration, which is preferably performed without dismantling the valve from the installation. Most local regulations allow end users to determine calibration. It leads to fewer interruptions in production and therefore reduces loss of productivity.
“This is a huge cost saving compared to the standard procedure, while test results are at least equal to conventional testing”
THE POWER OF NEXUS
1. The most comprehensive database of seat information from leading Relief and Safety Valve manufacturers.
2. Tamper-proof results, ensuring line pressure is set only before testing begins.
3. Automated pass/fail evaluations based on international standards.
4. Cutting-edge wireless communication technology.
These advanced features make NEXUS more efficient, faster, and lighter to use while guaranteeing tamper-proof results and minimizing human error.
AUXILIARY LIFT ASSIT DEVICE (ALAD)
The Prevetest NEXUS is an in-situ Relief/Safety valve tester based on ASME’s Auxiliary Lift Assist Device principle. It allows periodic testing of set-pressure and re-seating pressureof relief valves, with the following key benefits;
1. It does not require dismantling of the valves from the installation
2. It does not require modifications to existing plants
3. Testing in situ conditions does not require (theoretical) temperature corrections
VENTIL has extensive practical experience and knowledge to support the customers and PreVenTest operators. The installed base of 700+ units, calibration services and operator education has proven to be a very effective tool for over 20 years.
How does it work?
An universal test rig is placed on top of the Pressure Relief/Safety Valve, and is connected to the spindle. A gradually increasing pulling force is applied to the spindle to overcome the spring tension of the valve.This is achieved by using a hydraulic power pack linked to an electronic force transducer. A computer with smart software is then used to measure the force applied. By combining the test results with the information of the valve seat and line pressure its is possible to accurately assess the set pressure of the Pressure Relief/Safety Valve.
Light weight, portable and battery driven
The PreVenTest Nexus is a robust, but ingenious build system for testing all spring operated Pressure Relief/Safety Valve types and sizes, ‘In-Situ’, in process and under the normal operating conditions. The portable, light weight system enables you to prove and demonstrate the correct working and performance or identify Pressure Relief/Safety Valves in need of repair/maintenance, without disturbing or interrupting the plant operations.
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