SSL considers functional safety to be a core activity of its business. The following table lists our experience and strengths across the functional safety life-cycle (IEC61511).

IEC61511 Lifecycle Phase

SSL Profile


Hazard ID

Hundreds of reviews facilitated across several sectors. See table 2 for more detail. Training and qualification of leaders and participants across NZ.

All MHF & Petroleum Clients 20+ years experience

SIL Determination & Risk Assessment

Hundreds of scenarios assessed to determine SIL levels using LOPA and Risk Graph techniques. Several SIL assessment procedures developed. LOPA & SIL training conducted across NZ and Australia.

All MHF & Petroleum Clients 20+ years experience

SIS Requirements Specification (SRS)

Development of several company standards and specification of numerous safety functions. SSL have three TUV certified Functional Safety Engineers.

Ballance Agri-nutrients Todd Energy Vector Contact Energy Evonik Top Energy


Use of SIL Solver/ ExSILEntia to design and verify the design in accordance with the SRS

Balance Babbage Consultants Origin Evonik STOS Todd Energy Vector Contact Energy Worley Waste Petroleum Combustion Top Energy

Operation and Maintenance

Operational procedures (bypass, proof testing) to satisfy compliance with standards.

Ballance Agri-nutrients Vector Pan Pac


Design of MoC systems for plant and software changes

MoC audits of many companies Westside NZ Ltd Pan Pac TOP Energy Ngati Tuwharetoa

Functional Safety Management Plan

Developed several functional safety management systems and audited many companies against the IEC standard.

Balance Vector Westside Pan Pac Greymouth Petroleum City Rail Link (Victoria)

Functional Safety Assessments/ Audits

From Functional Safety Assessment of individual SIL functions through to full Functional Safety Management System Audits

Refining NZ Pan Pac Evonik Contact Ngati Tuwharetoa

Functional Safety