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These systems have been utilised in Germany for over 20 years and are proven to be extremely reliable in very rapid isolation of pipelines. However the technology is still developing to a point where the required reliability meets all users needs.
They are so reliable that the need for other safety related devices such as Safety Relief Valves can be minimised. They have the following advantages:
- Negating the need for flare systems to be sized for the case of a well failing to close.
- Production piping downrating, giving potential cost benefits of more than 25%
- Fast inventory isolation within two seconds
- Huge capital cost savings
For an HIPPS system the following components are required:
- An extremely reliable tight shut-off isolation valve which closes within 2 seconds
- Robust triplicated pressure sensing utilising switches or transmitters which are in a 2003 voting configuration
- A Programmable Electronic Safety System or Electronic Safety System which is “Stand Alone” and meets IEC 61508 SIL requirements appropriate to the application
- The Whole System Certified by an International Approval Body such as TUV
- Completely independent of “human intervention”
- Low Maintenance Requirement
The principal of operation is that the 2003 voted redundant pressure instrumentation trips on high pressure and isolates the pipeline very rapidly (typically within two seconds) by rapidly closing the valve. Dependant on the level of reliability required sometimes two HIPPS systems are installed in series. The need for this is determined by reliability analysis against a required facility reliability figure. These figures are determined by factors such as safety, environmental, public perception of a prescribed event and cost of an event.
TYPICAL APPLICATIONS
- Onshore Gas Pipelines
- Offshore and Onshore Gas Well Pipelines
- Offshore Subsea Applications
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High Integrity Pressure Protection Systems [HIPPS] for the Overpressure
Protection Of Pipeline Risers - This document is to
provide guidance for Inspectors in respect of the provision of remotely located
HIPPS, including those located subsea, for the protection of pipelines, pipeline
risers and some associated topsides process pressure systems. From the HSE (UK)
High
Integrity Protection Systems (HIPPS) – Making SIL Calculations Effective -
Jean-Pierre Signoret - In the oil industry,
traditional protection systems as defined in American
Petroleum Institute (API) 14C are more and more often replaced
by high integrity protection systems (HIPS). In particular, this
encompasses the well-known high integrity pressure protectionsystems (HIPPS)
used to protect specifically against overpressure. As safety
instrumented systems (SIS) they have to be analysed through the
formal processes described in the International Electrotechnical Commission
(IEC) 61508 and IEC 61511 Standards in order to assess
which Safety Integrity Levels (SIL) they are able to claim. Thanks to
Touchoilandgas.com
High
Integrity Pressure Protection Systems (HIPPS) - Angela E.
Summers, Ph.D., P.E., President, SIS-TECH Solutions, LLC -
Flare
Header Overpressure Protective HIPS System - This
application brief describes a typical High Integrity Protective Systems (HIPS)
to minimize overpressure events in reactors and distillation columns, and
thereby reduce the frequency of relieving to the flare. From Triconex.
High
Integrity Protection Systems For New And Existing Vessels -
Bryan A. Zachary and Angela E. Summers, Ph.D., P.E. - High Integrity Protection
Systems (HIPS) are Safety Instrumented Systems (SIS) implemented to address
overpressure scenarios in lieu of a pressure relief valve (PRV). HIPS
essentially replaces the PRV for those scenarios that the SIS is designed to
prevent. HIPS applications are generally pipeline and pressure vessel
overpressure protection. Thanks to SIS-TECH Solutions
Preventing
overpressure: A safety system success story - using failsafe systems to prevent
overpressure - David K. Thomas -From the ISA