Methods and apparatus to detect obstructed valves in pressure relief systems

A pressure relief valve comprising:

• an inlet port to be selectively fluidly coupled to a pressure vessel via a first shutoff valve;
• an exhaust port fluidly coupled to the inlet port via a valve, the valve to fluidly couple the inlet port and the exhaust port while a fluid pressure within the inlet port exceeds a threshold value;
• a first pressure sensor to detect a fluid pressure within the inlet port;
• a second pressure sensor to detect a differential fluid pressure between the exhaust port and the inlet port;
• and
• a data transmitter to transmit pressure data associated with the fluid pressures detected by the pressure sensors to a computing device.

A non-transitory machine readable storage medium comprising instructions to cause programmable circuitry to at least:

• obtain first pressure data from a vessel;
• obtain second pressure data from an inlet of a pressure relief valve, the pressure relief valve coupled to the vessel via a first isolation valve such that fluid flows from the vessel to the pressure relief valve when the first isolation valve is in an open position;
• obtain third pressure data from an outlet of the pressure relief valve, the outlet of the pressure relief valve coupled to the inlet of the pressure relief valve such that fluid flows from the inlet to the outlet when a pressure in the inlet exceeds a threshold pressure;
• and
• determine a state of one of the valves based on the pressure data.