Emergency shutdown system for dynamic and high integrity operations
AssigneeSaudi Arabian Oil Company
InventorsAbdelghani Daraiseh, Patrick S. Flanders
Life of this patent
Estimating the term…
Abstract
Provided in some embodiments are systems and methods for emergency shutdown (ESD) systems. Embodiments provide for receiving, from a central logic solver (CLS) of an emergency shutdown (ESD) system for a plant via a first communication channel, a command indicative of a first state for an ESD valve, in response to receiving the command, controlling the ESD valve to operate in the first state, obtaining, from a central status monitor (CSM) of the ESD system via a second communication channel, current status information for the plant, determining a second state for the ESD valve based at least in part on the current status information obtained from the CSM, and controlling the ESD valve to operate in the second state.
Claims31
An emergency shutdown (ESD) system for a plant, comprising:
- a central control system comprising:
- a central logic solver (CLS) comprising a first communication interface coupled to a first communication channel for communicating with each of a plurality of emergency shutdown (ESD) valves of the ESD system, wherein the CLS is configured to, for each of the ESD valves:
- determine a desired state for the ESD valve based on status information for the plant;
- and
- issue a command configured to cause the ESD valve to operate in the desired state, wherein the command is communicated to the ESD valve via the first communication interface and the first communication channel;
- a central status monitor (CSM) comprising a second communication interface coupled to a second communication channel for communicating with each of the ESD valves, wherein the CSM is configured to:
- maintain a current listing of current status information for the plant;
- and
- in response to determining that the CLS is unable to communicate with an ESD valve via the first communication channel, provide, to the ESD valve via the second communication interface and the second communication channel, at least a portion of the current status information for the plant for use in determining an appropriate state for the ESD valve;
- and
- the ESD valves, wherein each of the ESD valves comprises:
- a valve mechanism configured to regulate the flow of a medium through a pipe;
- an actuation system configured to move the valve mechanism between different operational states;
- a communication interface coupled to the first and second communication channels;
- and
- a local controller configured to:
- in response to determining that the first communication channel is unavailable:
- obtain, from the CSM, current status information for the plant;
- determine an appropriate state for the ESD valve based at least in part on the current status information obtained from the CSM;
- and
- control the actuation system to move the valve mechanism to a position corresponding to the appropriate state;
- and
- in response to receiving a command from the CLS specifying a desired state for the ESD valve, control the actuation system to move the valve mechanism to the desired state.
A method comprising:
- receiving, by a local controller of an emergency shutdown (ESD) valve from a central logic solver (CLS) of an ESD system via a first communication channel, a command indicative of a first state for an ESD valve;
- controlling, by the local controller in response to the local controller receiving the command, the ESD valve to operate in the first state;
- obtaining, by the local controller from a central status monitor (CSM) of the ESD system via a second communication channel, current status information for the plant;
- determining, by the local controller, a second state for the ESD valve based at least in part on the current status information obtained from the CSM;
- and
- controlling, by the local controller, the ESD valve to operate in the second state.
A non-transitory computer readable storage medium comprising program instructions executable by a computer processor to cause:
- receiving, by a local controller of an emergency shutdown (ESD) valve from a central logic solver (CLS) of an ESD system via a first communication channel, a command indicative of a first state for an ESD valve;
- controlling, by the local controller in response to the local controller receiving the command, the ESD valve to operate in the first state;
- obtaining, by the local controller from central status monitor (CSM) of the ESD system via a second communication channel, current status information for the plant;
- determining, by the local controller, a second state for the ESD valve based at least in part on the current status information obtained from the CSM;
- and
- controlling, by the local controller, the ESD valve to operate in the second state.
Dependencies are inferred from the claim text.