Tender: Replacement of 10 Penstocks at B Lock, Portsmouth Naval Base

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KBS Maritime is seeking a contractor for replacement of 10 penstocks across six chambers at B Lock within Portsmouth Naval Base. The penstock system controls sea water via a culvert system between the harbour, the basin and the dry docks and includes levelling penstocks of circa 8 metres deep up to drainage penstocks of circa 18 metres deep. The programme will replace existing cast iron doors with new doors (specification to be agreed) and supply associated shafts, wedges, door nuts, brackets, platforms, ladders, actuation and road plates. The project is due to commence in Q4 2026 with all replacements completed by February 2030. Contractors must demonstrate design, manufacture and installation of penstock replacements in a marine environment, including all site management under CDM regulations and competency in health and safety compliance and safe practices, and must possess at least five years' experience working within a marine environment; contractors who do not provide suitable and sufficient evidence of this will not be considered.