Easy To Reset ARBPP PPressure Relief Device 1 – 725psi Hard Seal

Easy To Reset ARBPP PPressure Relief Device 1 – 725psi Hard Seal

ARBPP Pressure Relief Device

As a member of ARBP famliy of pressure relief device provided by SMDERI, ARBPP type Pressure Relief Device is a over pressure protection device to be used in petrochemical industries, offshore platforms and etc. and is a non-reclosing pressure relief device.

I Work process/flow

Initial status: The valve is closed. The valve plate and the seat are tightly connected and sealed with eccentric parabola shape sealing surface. Meanwhile, the valve plate of three-eccentric butterfly valve is pushed forward due to the eccentric status, so a closing torque is added to strengthen the sealing.

Normal operation status: Under normal working conditions, upstream medium gas acts on the butterfly valve inlet. There is a pressure conduit between the valve inlet and the cylinder and through this conduit, the medium pressure is transferred into the cylinder and directly acts on the piston integrated to the valve rod with nuts. The buckling pin is at the other end of the valve rod. The actuator is controlled by the valve rod mechanism. When the medium gas pressure is lower than the set relief pressure, i.e., the load forced on the pin is less than the critical load, the pin keeps stable straight status and the valve plate and seat keep firmly sealed, and thus the valve is in a stable sealed status.

Relief status: As the medium gas pressure increases and reaches the set value, the pressure exerted on the piston will be transmitted to the buckling pin through the valve rod and the load approaches the critical load. As long as it reaches the yield point of the buckling pin, the pin buckles in milliseconds, and thus reduces the length in valve rod direction significantly. Therefore, the valve rod moves quickly and switches the pathway. The change of pathway causes the pneumatic actuator to open the valve. Once the valve is open, the medium inlet and outlet are connected and the high pressure media gas is released instantaneously.

When the valve opens, the operator can determine whether the pressure relief takes place or not by observing the valve appearance; or the position switch mounted to corresponding position transmits the pressure relief signal to the remote control room and informs the operator about the valve position.

II Specification

III Advantages

--- High accuracy of the relief pressure: usually within±5%;

--- The bucking pin is not affected by the cyclic change of the pressure inside the pipeline;

--- The bucking pin is not exposed to the medium;

--- It is easy to judge if pressure relief takes place;

--- It is easy reset the valve with low cost for shut down;

--- No fragment is generated from the relief process;

--- Low operation cost on long term service.

IV Application

Project: Ground Flare System of methanol plant for the methanol production complex

Designed capacity of the plant: 74480kg/h + 1837kg/h

Source of signal: Pressure signal of flare gas manifold