page_title: Wellman Group
section_title: Wellman Defence
hierarchical_section_title: Wellman Group / Structure / Wellman Defence
caption_attribution_description: HMS Astute on the shiplift after launch.
context_page_description: The Wellman Group is a group of manufacturing companies that make boilers and advanced defence equipment. It is one of the main boilermakers in the UK, if not the most common for large-scale industrial applications, having taken over many well-known boiler companies.
context_section_description: This started as the research division of John Brown Engineers and Constructors Ltd in 1957. It became part of Wellman Group in 1996. Its main significance is that it developed the equipment for purified air that allows the Royal Navy's nuclear submarines to be submerged for months at a time – Submarine Atmosphere Control. This uses an electrolyser. Carbon dioxide from the submarine reacts with hydrogen from the electrolyser and is removed.
  It also supplies oxygen generation equipment to other countries such as France for the new Barracuda-class submarine.
  Wellman Defence was acquired by Corac Group plc in 2012 and renamed to Atmosphere Control International.
  Corac Group plc was renamed as TP Group plc in 2015 and Atmosphere Control International has since been renamed as TPG Maritime
caption: It makes the air purifiers for the Astute class
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