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Independent consultant

The Chalfonts Consultancy

HAZOP facilitationSIL assessmentLOPASIL verificationFunctional safety lifecycle (IEC 61511)

United Kingdom · Listed August 4, 2026 · See all HAZOP consultants in UK →

Where they fit

UK functional-safety practice specialising in IEC 61511 since 2007, offering an independent HAZOP facilitator/chairman and SIL assessment chairman (LOPA or risk graph) plus SIL verification with exSILentia — a fit for operators wanting a self-contained functional-safety review.

About

The Chalfonts Consultancy is a UK functional-safety practice, established in 1997 and specialising in functional safety since 2007, that provides an independent HAZOP facilitator/chairman and a SIL facilitator/chairman for SIL assessment and classification using methods such as Layer of Protection Analysis (LOPA) and risk graph. It also carries out SIL verification of safety instrumented functions (using exSILentia, simplified equations and fault-tree analysis), writes safety requirement specifications, plans the IEC 61511 functional-safety lifecycle and drafts lifecycle procedures. Its engineers hold Certified Functional Safety Engineer (CFSE) and TÜV Functional Safety Engineer credentials.

At a glance

RegionsUK
IndustriesChemicals, Oil & gas, Process industries
ServicesHAZOP facilitation, SIL assessment, LOPA, SIL verification, Functional safety lifecycle (IEC 61511)
CertificationsCertified Functional Safety Engineer (CFSE), TÜV Functional Safety Engineer
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