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SVN Consulting News

Update of pipeline failure rates and failure modes

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RR1035 Update of pipeline failure rates for land use planning assessments

The Health and Safety Executive (HSE) uses a model, MCPIPIN (Monte Carlo PIPeline INtegrity), to determine failure frequencies for major hazard pipelines. MCPIPIN uses two models to calculate the failure rates: a model based on operational experience data which estimates failure frequencies for the four main failure modes (mechanical failures, ground movement and other events, corrosion, and third party activity); and a predictive model that uses structural reliability techniques to predict the failure frequency due to third party activity only. The historical failure rates used in the operational model are over 10 years old. HSE asked the Health and Safety Laboratory (HSL) to review and update the failure rates using more up-to-date fault and failure data. Data from CONCAWE (CONservation of Clean Air and Water in Europe) for crude oil and products has been analysed, as well as that from UKOPA (UK Onshore Pipeline Operators Association). EGIG (European Gas pipeline Incident Group) data was requested but was not made available. Failure rates by the four different failure modes have been derived from each of the datasets. In addition, substance specific failure rates have been derived, based on earlier analyses of appropriate combinations of UKOPA, CONCAWE or EGIG data.

If you are looking to understand you failure modes so that you can make better and more informed planning decisions contact us. It doesn’t matter if you are in a lower risk industry or working within high risk, highly technical industries – we can help.

HSE review of the event tree structure and ignition probabilities

Event tree analysis

RR1034 Review of the event tree structure and ignition probabilities used in HSE’s pipeline risk assessment code MISHAP

The Health and Safety Executive (HSE) uses the MISHAP01 (Model for the estimation of Individual and Societal risk from HAzards of Pipelines) model to calculate the risks associated with Major Accident Hazard (MAH) pipelines in Great Britain. The risks calculated are used to determine the distances to land-use planning (LUP) zones around the MAH pipeline. The UK Onshore Pipeline Operators Association (UKOPA) has queried some of the assumptions and methods currently used within the tool and has compiled a briefing note outlying areas of concern. In response to the briefing note, HSE asked the Health and Safety Laboratory to review the MISHAP tool. The review examined the natural gas and non-natural gas event tree structures used by the tool as well as the probability values used to populate them. The review proposes replacing the generic natural gas and non-natural event trees with three event trees that take into account the minimum ignition energy of the substance and the substance reactivity. The derived event trees will feature in future versions of the MISHAP tool.

If you would like to know more about event tree analysis, fault tree analysis or linking the two theories together using the bow tie method please use our contact form below. If you would like assistance in carrying out your own investigations we would love to talk through the options we can offer you.

Food safety standards now include allergens and nutrition

Food Safety Nutrition and Allergens

Food safety standards now include allergens and nutrition – catering providers are now responsible

Food safety standards have moved on over the last few years. Recently allergen controls were brought in and the responsibility has been placed on the food handlers.

Nutrition is set to be an equal burden to hospitality and catering companies and is a requirement later this year.

SVN Consulting has identified that many companies will be affected by these changes and that to roll out a generic training programme is not likely to meet the individual company needs. A bespoke approach may be required taking into consideration suppliers and operating environments.

For more information or guidance on how to approach the issues around nutrition and allergen control please contact us.

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