In light of increasingly strict environmental regulations, it is important to minimize emissions wherever possible. High-integrity pressure protection systems (HIPPS) prevent over-pressurization of pipelines by shutting off the source of high pressure. In contrast to conventional relief systems, HIPPS solutions contain excess fluids or gasses in the system instead of releasing them. This increases safety, reduces losses, and prevents emissions, ensuring your plant complies with regulations.
A High-Integrity Pressure Protection System (HIPPS) is a type of safety instrumented system (SIS) designed to prevent over-pressurization of a plant, such as a chemical plant or oil refinery. The HIPPS will shut off the source of the high pressure before the design pressure of the system is exceeded, thus preventing loss of containment through rupture (explosion) of a line or vessel. Therefore, a HIPPS is considered as a barrier between a high-pressure and a low-pressure section of an installation.
Advantages of HIPPS
HIPPS provides a solution to protect equipment in cases where:
- high-pressures and / or flow rates are processed
- the environment is to be protected
- the economic viability of a development needs improvement
- the risk profile of the plant must be reduced
HIPPS is an instrumented safety system that is designed and built in accordance with the IEC 61508 and IEC 61511 standards.
The international standards IEC 61508 and 61511 refer to safety functions and Safety Instrumented Systems (SIS) when discussing a device to protect equipment, personnel and environment. Older standards use terms like safety shut-down systems, emergency shut-down systems or last layers of defence.
Components of HIPPS
A system that closes the source of over-pressure within a specified time with at least the same reliability as a safety relief valve is usually called a HIPPS. Such a HIPPS is a complete functional loop consisting of:
- sensors, (or initiators) that detect the high pressure
- a logic solver, which processes the input from the sensors to an output to the final element
- final elements, that actually perform the corrective action in the field by bringing the process to a safe state. In case of a HIPPS this means shutting off the source of overpressure. The final element consists of a valve, actuator and solenoids.