Petrosadid: HIPPS

HIPPS is the acronym for High Integrity Pressure Protection System. Main function of HIPPS is an independently instrum whose function is to protect an installation from the overpressure produced in the high pressure part of the same, isol pressure part from it.

Idea of HIPPS is to be used instead of traditional safety systems such as relief devices with four main advantages:

Environment protection: relief systems release the service fluid to the atmosphere which while HIPPS avoid flui released out of the system keeping the environment free of emissions.

HIPPS have to be a safety level equal or higher than the traditional relief methods; calculated safety levels show to be ten times more reliable than traditional methods.

Creating a frontier between two parts of the installation allows the downstream part of the valves of the HIPP lower pressure and therefore, to reduce the cost of pipes and related pressure equipment installed on that part.

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The complete HIPPS consist of several elements that are detailed below:

Initiators (Pressure Transmitters). HIPPS are typically supplied with three pressure transmitters that monitor the line and provide the information to the next element.

Logic Solver: it receives the information from Pressure Transmitters and it is configured to send the signal to op final elements, when the received input is above the preconfigured pressure value.

Final elements: Final elements have the function of isolating the downstream part of the installation from the o Typically, final elements consist of two valves with their related actuators installed in serial to be closed when received from the logic solver.

Petrosadid: HIPPS


HIPPS are designed according to following standards:

IEC 61508: “Functional Safety of Electrical/Electronic/Programmable Electronic Safety Related System”.

IEC 61511: “Functional Safety: safety instrumented systems for the process industry sector”.

ANSI/ISA S84.01: “Application of Safety Instrumented Systems of the Processed Industries”.

Standards mentioned above are performance based so design of HIPPS is also based on the required Safety Integrity SIL has four categories, from 1 to 4, and it is defined by plant end user by means of making a risk analysis of the p related to the fulfillment of the tolerance risk: this means that SIL level results of the combination of two factors:

Frequency of fail occurrence.

Consideration of the consequences of fail (dangerous failure or safe failure).

Safety Instrumented Function (SIF) defines the level of protection against failure and it is defined by the Probability of Demand (PFD). PFD avg is defined as the average probability of failure the safety function between 0 to 1. Standard defines the maximum allowable PFD avg value depending how often the demand of SIF is:

High demand: safety demand interval shorter than one year.

Low demand: safety demand interval longer than a year.

Petrosadid: HIPPS


Our HIPPS typically use one set of initiators to measure the process conditions, a logic solver (controller) to process the measured data and a set of end elements to provide the safeguarding action. End- elements can include valve/actuators together with circuit breakers that perform the closing (shut down) action.

PETROSADID Engineering staff designs every safety system according to the clients requirements, as well as offering alternative progressive solutions.

Petrosadid: HIPPS


Increased plant reliability

Certified safety integrity level knowledge and experienced engineers at client’s disposal

Third party SIL assessment certification and safety analysis report

A unique partner acting as a single source responsible for the whole system

Specifically engineered actuators with a unique integrated quick exhaust valve Complete with adjustable end of stroke damper device in order to ensure fast acting Stroking times and valve drive train protection

Unlimited valve torque and thrust coverage

Fully integrated factory acceptance testing of the complete system

Fully integrated site acceptance testing of the complete system

Petrosadid: HIPPS


Possible risks matrix

High Safety Integrity Level as a necessary risk reduction

Petrosadid: HIPPS
Petrosadid: HIPPS

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