Zero Emission at Tank Operating Pressure
ZETOP Valves
Zero Emission at Tank Operating Pressure
Background
A leading petrochemical operator in China faced increasing regulatory pressure to reduce volatile organic compound (VOC) emissions from its storage tanks. The client’s site relied on standard pressure and vacuum Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. relief devices, many of which showed high leakage rates and lacked proper certification. This posed both compliance risks and environmental challenges.
Solution
To help the client meet tighter emission limits, PROTEGO® specified the use of certified low-leakage pressure and vacuum relief valves according to the applied Safety Standard for VOC collection and treatment across tank farms.
As part of the site upgrade, PROTEGO® supplied them with zero-emission valves engineered to achieve exceptional sealing performance at normal operating pressure Operating pressure Operating pressure is the pressure existing at normal operating conditions within the system being protected. . Side-by-side testing was conducted using a portable VOC detector to compare the leakage from PROTEGO® valves with that of the standard units previously installed on the tanks.
Near-zero leakage
The tests showed that PROTEGO® ZETOP valves achieved near-zero leakage, while the existing devices recorded emissions exceeding 5,000 ppm under identical conditions. With this performance verification in place, the operator approved a full replacement program.
Results
The facility installed 60 PROTEGO® ZETOP valves to replace all standard products across the tank farm. The upgrade delivered:
- Near-zero VOC emissions at operating pressure, supporting compliance with China’s evolving environmental regulations.
- Improved safety and environmental performance across all storage tanks.
- Standardisation of certified, high-integrity venting equipment Equipment Machines, appliances, fixed or mobile devices, control parts and accessories, and warning and prevention systems, whether separate or combined, intended for the generation, transfer, storage, measurement, control, and conversion of energy, and for the processing of materials, which have their own potential source of ignition and may cause an explosion. in accordance with the client's VOC Safety Standard.
Following the installation, all tanks at the facility are now protected by PROTEGO® ZETOP valves, forming one of the region’s strongest examples of emissions-optimized tank venting.
The PROTEGO® valves demonstrated outstanding zero-emission performance and helped us achieve the environmental standards required for our site.
