Corrosion-resistant diaphragm actuators for BP refinery in Gelsenkirchen
In Gelsenkirchen, BP operates a complex refinery and petrochemical site producing high-quality gasoline and diesel grades, heating oils & aviation fuels. The refinery in Scholven also produces petrochemical products such as ethylene and propylene, for further processing into plastics.
Due to the corrosive environment in the industrial plants, extremely robust components are required. In this context, A. Hock supplied diaphragm actuators including adaptation to the control valves from Emerson/Sempell. The pneumatic valves are now in use at BP in Gelsenkirchen.
The requirement - Strong diaphragm actuator for Sempell valve
To meet the high process requirements, Emerson/Sempell works with the AIR&SPRING design tool for A. Hock diaphragm actuators. The actuators are to be delivered to the end customer with adaptation for pneumatic valves.
Context: Sempell valves are designed for the toughest environments and offer the highest reliability for any application in industrial processes.
The challenges - Corrosive refinery environment
The actuators require the special C3H coating due to the corrosive atmosphere on site. According to the DIN EN ISO 12944 corrosivity category, "C3" means an industrial atmosphere with moderate SO2 contamination. The "H" stands for a durability or a protection period of more than 15 years.
The result - SIL2 diaphragm actuators with special coating
A total of six pneumatic diaphragm actuators of function class SIL2 were delivered to the customer. Compared to piston actuators, diaphragm actuators have the great advantage that they are available in smaller sizes and are less expensive. The special C3H coating protects the actuators from the high loads in the refinery.
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