North West Construction Safety Group
08 Jun 2016

RR1036 – Rewriting the PIPIN code to use a Monte Carlo solution approach

HSE uses a fracture mechanics model, PIPIN (PIPeline INtegrity model), to predict the likelihood of failure if a buried pipeline is struck by machinery. The existing model fails to produce results for some scenarios. The Health and Safety Laboratory were asked to rewrite PIPIN replacing the methodology with a Monte Carlo solution method.

03 Jun 2016

RR1035 – Update of pipeline failure rates for land use planning assessments

HSE uses a model, MCPIPIN (Monte Carlo PIPeline INtegrity), to determine failure frequencies for major hazard pipelines. It uses two models; one based on operational experience data and a predictive model. The historical failure rates used in the operational model are over 10 years old. A review took place to update this data.

01 Jun 2016

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

HSE uses the MISHAP (Model for the estimation of Individual and Societal risk from HAzards of Pipelines) model to calculate risks associated with major hazard pipelines in GB. The review took place in response to the UK Onshore Pipeline Operators Association (UKOPA) challenging some of the assumptions and methods currently used within the tool.

23 Dec 2015

RR1072 – Investigations into the immediate and underlying causes of failures of offshore riser emergency shutdown valves

Riser emergency shutdown valve (RESDV) failures, whether arising from a test or a real demand, are reportable to HSE under RIDDOR and a preliminary survey found approximately 180 cases of failure. Given the criticality of RESDVs to offshore safety, it was determined that the reasons for these occurrences should be investigated.


Covid19 – Our awards event scheduled for tonight WILL go ahead as planned!!

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