Turbine Surface Technologies Limited Logo

Turbine Surface Technologies Limited

Client: Turbine Surface Technologies Limited
Name of Project: Arc Flash Risk Assessment Study
Project Completion Date: 2020-11-01

About TSTL

Established in August 2000 TSTL are a Joint venture company between Rolls-Royce and Chromalloy.

Building on the strengths of both parent companies:
• Rolls-Royce, innovation of new coatings and strong market
• Chromalloy, proven production implementation and knowledge

TSTL is a centre of excellence specialising in coatings for gas turbine components located in the hot gas path section of the engine.
• Responsibility to improve the process
• Generate new technology
• Develop people skills to apply this technology to new products
• Establishing operational best practice
TSTL is part of the Rolls-Royce Turbine Components Supply Chain.


Turbine Surface Technologies Limited approached Electrical Safety UK, to provide and deliver an arc flash risk assessment at the Nottingham facility in compliance with UK/European Legislation using the benchmark IEEE 1584 and NFPA 70E Standards.


Electrical Safety UK carried out a free of charge, on-site pre-assessment to determine the extent of the scope of works at Turbine Surfaces Technologies Ltd, Nottingham to determine the size of their HV & LV network. We provided a fixed price proposal for an Arc Flash Risk Assessment Study and agreed the project milestones and completion dates with the client.


Electrical Safety UK agreed on the scope and strategy with the TSTL site management team at their Nottingham site.

The discovery phase of the work was coordinated with the facility shutdown period. Enabling the gathering of information on the electrical distribution system by comprehensively surveying the site’s electrical systems without hindering production and operations. The surveying was done using a tablet and the EasyPower® Onsite software.

The data collected and verified during the site data collection process with our tablet and EasyPower® Onsite software was downloaded into our EasyPower® modelling software. We analysed the Nottingham site electrical system including:

• short circuit analysis
• simple protective device coordination
• arc flash incident energy
• arc flash boundary distance

The site was supplied from the Western Power Distribution 11kV network.
Any instances where the 3-phase prospective short circuit current exceeded the breaking capacity of protective devices was highlighted in the report.

Protection device time-current characteristic curves showing any instances of miscoordination were provided. Incident energy levels and arc flash boundary distances were listed for all equipment included in the scope of the study.

Up to date single line diagrams for the electrical network were provided to TSTL that included Site Data, Fault Study and Arc Flash Study Analysis.
Incident energy hazard reduction analysis was then carried out and preferred options and order of magnitude costs were given for the reduction of the incident energy where it was above 8 cals/cm2.

Electrical Safety UK presented the Arc Flash Report via video conferencing with TSTL Team.

Arc Flash labels to the UK/European standard were issued for application to the electrical equipment switchgear and enclosures.

Find out more about how we can help with the safe management of Arc Flash on your site by clicking here

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