Systems, devices and methods for preventing overpressurization of subsea equipment and flowlines

A system for preventing overpressurization of piping for transporting fluid produced from a pressure source to a receiving facility, wherein the piping comprises a piping wall defining an interior and wherein the fluid is directed from the pressure source through the piping to a high integrity pressure protection system (HIPPS) located between the pressure source and the receiving facility;

• the HIPPS comprising a pressure sensor, a HIPPS valve and a control system for detecting a pressure surge in the piping greater than a HIPPS activation pressure and for closing the HIPPS valve over a valve closure time period to shut off flow in the piping in response to the pressure surge, the system comprising:
• a container having an inner diameter wherein the container has a container opening that can be aligned with and securely attached to a piping wall opening in the piping wall downstream or upstream of the HIPPS such that the container can be placed in fluid communication with the interior of the piping and wherein the container is detachable and retrievable;
• a piston seal positioned within the container capable of completely blocking the container opening in a sealed position and movable between a first position and a second position within the container;
• and
• a source of force acting on the piston seal from within the container to ensure the piston seal remains in the sealed position thereby preventing fluid from the interior of the piping from entering the container at fluid pressures up to a predetermined threshold pressure greater than or equal to the HIPPS activation pressure, such that when fluid being transported within the piping exceeds the predetermined threshold pressure, the piston seal is temporarily and reversibly displaced from the sealed position and fluid from within the piping is permitted to partially fill the container and a fluid pressure increase within the piping is consequently lessened;
• wherein by the use of the system, a required valve closure time period to shut off flow in the piping in response to the pressure surge of the HIPPS valve can be increased, a number of activations of the HIPPS can be reduced, a life of the HIPPS valve can be lengthened, a length of a fortified pipeline zone located immediately downstream of the HIPPS can be reduced, and/or a wall thickness of the fortified pipeline zone can be reduced.