ATEX / DSEAR Case Study 1

Client: BAE Systems

BAE Systems


In 2017 IMS was awarded a series of contracts to facilitate HMNB Portsmouth becoming Dangerous Substance and Explosive Atmosphere (DSEAR) 2002 Compliant. This involved reviewing every room within all 425 buildings within the footprint of the Naval Base and HMS Nelson to identify any Hazardous substances which were in use and any potential sources of release which could lead to a Potentially Explosive Atmosphere being formed.

Scope of Works

Contract No. 1 Stage 1 DSEAR Assessments

  • Identify all Hazardous Substances being used within every room in every building within the Naval Base in Portsmouth
  • Identify quantities of hazardous substances in use and any potential sources of release
  • Evaluate the need for a further stage 2 assessment depending upon findings and available standard models for Hazardous Areas
  • Record findings and notify BAE of any areas requiring a detailed Stage 2 DSEAR Assessment

Contract No. 2 Stage 2 DSEAR Assessments

  • From the information gathered in the Stage 1 Assessments Calculate any potential Hazardous Zones caused by the source of release of the Hazardous Substance
  • Complete a Hazardous Area Classification identifying the Type and Extent of the Hazardous Zones within the relevant building
  • Complete a Hazardous Area Risk Assessment identifying any remedial actions and procedures to be put in place to reduce the potential for a source of ignition becoming active
  • Complete Hazardous Area Classification Drawings
  • Identified the need for ATEX Inspections to be carried out and training required
  • Identified the need for in house training to provide competency for working upon ATEX electrical equipment to complete inspection
  • Identified a need for BAE RP DSEAR to be trained and appointed to oversee ongoing management and compliance of identified DSEAR Areas within the Naval Base

Contract No. 3 DSEAR Electrical Inspections

  • The findings of the Hazardous Area Risk Assessment carried out in the DSEAR Stage 2 assessment above identified that relevant Atmosphere Explosive (ATEX) Electrical inspections had lapsed for a number of years and needed to be completed
  • Legacy equipment classified prior to DSEAR coming into force need to be risk assessed for suitability for ongoing use
  • Remedial actions needed to be raised for faults found during the inspections
  • An ATEX Electrical Equipment register was formed for logging and upkeep of installed equipment

Contract No. 4 DSEAR Remedial Works

  • Due to the findings from the above Hazardous Area Classifications and ATEX Inspections various Electrical items were replaced throughout the Naval Base
  • Replaced a number of Extraction Systems for DSEAR Compliance within the Naval Base
  • Completed a number of Design and Replacement programs for Legacy equipment which could no longer continue to be used

How we do it

We identified 6 Buildings within HMNB Portsmouth which had DSEAR requirements. Upon completion of this identification we issued the relevant documentation to enable BAE to be able to manage their DSEAR Areas and assisted their newly appointed RP DSEAR to create their Explosion Protection Document and Verification Dossier which are requirements under DSEAR.

We assisted with the implementation of ATEX Electrical inspections and the schedule required over each 3 year period to remain compliant.

What we have achieved

IMS enabled BAE Systems to make HMNB Portsmouth the first Naval Base in the UK DSEAR Compliant.

We are now the Subject Matter Expert (SME) DSEAR for HMNB Portsmouth.