Case Studies

The following case studies are short summaries of the application of the SALVO process to individual decisions. Over 30 such case studies are available. More comprehensive programmes of such study are increasingly becoming available for publication and sharing - some are represented in the white Papers section of this website.



CASE STUDY | Optimal replacement timing for 'obsolete' instrumentation & control systems

When is the optimal timing for replacing and upgrading assets that are no longer supported ('obsolete')?

The 30-year old control systems for the 3rd largest oil refinery in the world were no longer supported by the vendor (spares & technical support) so a major upgrade and replacement programme was proposed. The technical staff warned that replacement was urgent, and a multi-million $$ budget had been approved: the SALVO  process was used to evaluate different upgrade and renewal strategies. The study, using the DST Lifespan Evalator module, identified the optimal, phased renewal programme that saved 60% of the total proposed capital expenditure (combination of costs avoided and deferred, risks reduced and operating cost savings).



CASE STUDY | Optimal testing frequency for 11kV circuit breaker

What is the optimal functional (trip) testing interval for a 11kV circuit breaker?

Circuit breakers peform a critical role in an electrical supply network. If they are in a failed state (whihc might not be evident to the operational personnel at the time), major incidents can occur if their protective function is not availalbe. So a cost-effective testing programme is needed to find and fix any failures.

The organisation has 5000 circuit breakers across their network, currently tested every year. By using the SALVO  process and the DST Inspection Evaluator tool, this strategy was shown to be inappropriate. The structured SALVO process, supported by instant cost/risk modelling, revealed the optimal testing interval to be 6-yearly.



CASE STUDY | Optimal renewal cycle for reactor catalyst

When to replace an expensive process catalyst that is deteriorating in performance?

Chemical reactors in oil refineries and petrochemical plants rely on sophisticated, very expensive catalysts for their processes. However catalysts become 'poisoned' over time and their performance degrades. In some cases they can be recycled and 'washed' chemically, in others they simply have to be periodically replaced.

This case study addressed the optimal time for catalyst change. It involved quantifying the (uncertain) degradation pattern, the risks introduced by the replacement, and the various costs of materials, labour, downtime, etc.





SALVO Tools & Methods


  • Comprehensive range of modular training courses.
  • 1-3 day units with in-house, public and customised delivery options.
  • 3-tier Competency Framework for Certified practitioners, facilitators and consultants.


  • Taster workshops to trial SALVO on your own cases.
  • Facilitated study programmes to explore and integrate into your business processes.
  • Call-in expert analyst service for periodic studies or taskforce review programmes.

Software tools 

  • Modular decision-support suite
  • Enterprise, network & PC configurations
  • Software-as-a-Service options (access on-line)