ISO TR 12489-2013 PDF

Full title and description

ISO/TR 12489:2013 — Petroleum, petrochemical and natural gas industries — Reliability modelling and calculation of safety systems. Technical Report providing guidance for probabilistic reliability modelling and quantitative calculation of safety systems used in the oil, petrochemical and natural gas sectors.

Abstract

ISO/TR 12489:2013 aims to bridge the gap between current state‑of‑the‑art probabilistic methods and their practical application to safety systems in the petroleum, petrochemical and natural gas industries. The report focuses on probabilistic calculation of random failures and offers guidance on modelling approaches (analytical formulae, Boolean techniques, Markov models, Petri nets, Monte Carlo simulation), treatment of dependent and common‑cause failures, reliability data practices and handling numerical uncertainty. Elementary hazard analyses (PHA, HAZID, HAZOP, FMECA) and non‑random failures are outside the scope, although their outputs are treated as essential inputs to probabilistic analyses.

General information

• Status: Published
• Publication date: 1 November 2013
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 75.200, 75.180.01
• Edition / version: Technical Report — Edition 1 (2013)
• Number of pages: 261

Scope

This Technical Report provides guidance to reliability and safety analysts on the probabilistic modelling and quantitative calculation of safety systems for the petroleum, petrochemical and natural gas industries. It addresses selection of modelling frameworks, relevant probabilistic parameters, typical modelling difficulties and effective solutions. The focus is on random failures and probabilistic techniques; deterministic preliminary hazard methods and non‑random failures are out of scope but recognised as necessary inputs.

Key topics and requirements

• Framework and workflow for reliability and safety‑calculation tasks.
• Analytical formulae for low‑demand (on‑demand) modes and simple architectures.
• Boolean approaches: Reliability Block Diagrams (RBD), Fault Tree Analysis (FTA), Event Trees.
• Markov models for multi‑state and time‑dependent behaviour.
• Petri nets and sequence modelling for complex concurrent and sequential systems.
• Monte Carlo simulation techniques for uncertainty propagation and complex interactions.
• Failure classification: safe vs unsafe failures, dependent failures and common‑cause failures (CCFs).
• Guidance on reliability data sources, collection, parameter selection and numerical uncertainty handling.
• Application examples (single/dual channel, redundant architectures, multiple safety layers, emergency depressurization) and modelling limitations.

Typical use and users

Used by reliability and functional safety engineers, process safety analysts, asset integrity and maintenance managers, consultants performing probabilistic safety assessments, and regulators or auditors in the oil, gas and petrochemical sectors. Typical applications include SIL/SIS assessments, quantitative risk assessment (QRA), design verification of redundant safety architectures, test‑interval optimisation and reliability‑centred maintenance planning.

Related standards

Complements and is typically used alongside IEC 61508 (functional safety), IEC 61511 (SIS for the process industry), ISO 14224 (reliability and maintenance data collection), ISO 20815 (production assurance and reliability), ISO 31000 (risk management), ISA TR84 and relevant API recommended practices. The document has also been endorsed/adopted in regional catalogues (for example CEN adoption as CEN ISO/TR 12489:2016).

Keywords

reliability modelling, probabilistic calculation, safety systems, petroleum, petrochemical, natural gas, fault tree, reliability block diagram, Markov models, Petri nets, Monte Carlo, common‑cause failure, SIL, safety instrumented systems, reliability data, quantitative risk assessment

FAQ

Q: What is this standard?

A: ISO/TR 12489:2013 is a Technical Report offering guidance on probabilistic reliability modelling and quantitative calculation methods for safety systems in the petroleum, petrochemical and natural gas industries.

Q: What does it cover?

A: It covers modelling frameworks and practical approaches (analytical formulae, Boolean methods, Markov models, Petri nets, Monte Carlo), failure taxonomy and treatment of dependent/common‑cause failures, reliability data practices and illustrative application examples. It excludes elementary deterministic hazard analyses and non‑random failures as primary topics.

Q: Who typically uses it?

A: Reliability and functional safety engineers, process safety analysts, maintenance and asset integrity managers, consultants conducting quantitative safety assessments, and regulators or auditors in the oil and gas and petrochemical industries.

Q: Is it current or superseded?

A: The document was published on 1 November 2013 as a Technical Report (Edition 1). As of the latest catalogue entries it remains published and has not been identified as withdrawn or formally superseded; users should check their national standards body or the ISO catalogue for the absolute current life‑cycle status when making procurement or compliance decisions.

Q: Is it part of a series?

A: ISO/TR 12489 is a standalone Technical Report produced by ISO/TC 67 (Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries). It is complementary to other ISO and IEC functional safety and reliability standards rather than being a numbered multi‑part series.

Q: What are the key keywords?

A: reliability modelling, probabilistic calculation, safety systems, petroleum, petrochemical, natural gas, fault tree, RBD, Markov, Petri nets, common‑cause failure, SIL, SIS.