Source: https://tendernation.io/opportunities/01a13d1a-07f0-7327-a337-25fc08529ca4/b-lock-penstocks-replacement closed GB restricted procedure Suitable for SMEs # B Lock Penstocks Replacement [KBS Maritime Ltd](https://tendernation.io/buyers/kbs-maritime-ltd) Estimated value £3,500,000 to £5,000,000 Published 20 May 2026 Deadline Closed 18 Jun 2026 ## Who can bid - Buyer says suitable for SMEs The buyer ticked “suitable for SMEs” on the notice. Anyone can still bid. [More contracts for small businesses and VCSEs](https://tendernation.io/opportunities/for-small-businesses) ## About this tender KBS Maritime have a requirement for penstock replacements at B Lock within Portsmouth Naval Base. The project consists of 10 in number replacement penstocks in 6 chambers overall. The penstock system controls sea water via a culvert system between the harbour, the basin and the dry docks. These include levelling penstocks of circa 8 metres deep to drainage penstocks circa 18 metres deep. The replacement programme will replace the current cast irons doors with new with specification to be agreed along with the associated shafts, wedges, door nut, brackets, platforms, ladders and actuation and road plates. This project is due to commence in Q4 2026 with all to be replaced by Feb 2030. Contractors must be able to demonstrate design, manufacture and installation of penstock replacements in a marine environment including all site management under CDM regulations and competency of Health and Safety compliance and safe practices. Contractors must also 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 ## CPV classification Penstock valves Source Contracts Finder (UK) [View official notice](https://www.contractsfinder.service.gov.uk/notice/460a065c-7694-4e69-a1aa-9b4f193fa560) Never miss a tender like this again Get AI summaries, deadline alerts and a bid pipeline for tenders matched to your business. Free to start. [Track tenders free](https://tendernation.io/register) [Buyer profile KBS Maritime Ltd: past awards and live tenders](https://tendernation.io/buyers/kbs-maritime-ltd) [Sector More Industrial machinery tenders](https://tendernation.io/sectors/industrial-machinery) ## More tenders like this [Taps, cocks and valves – Armaturen für den Erdeinbau · Hamburger Energiewerke GmbH · 29 days left · 16 Nov 2026](https://tendernation.io/opportunities/01a15183-5420-7127-9c40-a62d1d50b931/germany-taps-cocks-and-valves-armaturen-fur-den-erdeinbau) [Miscellaneous cleaning machines – Siivouskoneet ja tekstiilienkäsittelylaitteet · Numera Palvelut Oy · 23 days left · 11 Nov 2026](https://tendernation.io/opportunities/01a15183-3f6e-73fc-af88-53a623859b34/finland-miscellaneous-cleaning-machines-siivouskoneet-ja-tekstiilienkasittel) [Milling machines – 5-Achs-Fräsmaschine · Technische Universität Hamburg · 29 days left · 17 Nov 2026](https://tendernation.io/opportunities/01a15183-415a-727e-8083-eeb94ff038d7/germany-milling-machines-5-achs-frasmaschine) [Boiler installations – Neubeschaffung von zwei baugleichen Heißwassererzeuger für den Standort Köpenick · BEW Berliner Energie und Wärme GmbH · 29 days left · 16 Nov 2026](https://tendernation.io/opportunities/01a15183-15f0-7290-b267-ee377bf4c98e/germany-boiler-installations-neubeschaffung-von-zwei-baugleichen-heisswassere) [Drinks dispensers – Warme drankenautomaten · Gemeente Almelo · 43 days left · 1 Dec 2026](https://tendernation.io/opportunities/01a15183-1fb0-73b3-9de4-809143065220/netherlands-drinks-dispensers-warme-drankenautomaten) [Miscellaneous special-purpose machinery – Výstavba lanovej dráhy na Martinské hole · Mesto Martin · 57 days left · 15 Dec 2026](https://tendernation.io/opportunities/01a15183-5ccc-70db-b65f-69eb1062d8b3/slovakia-miscellaneous-special-purpose-machinery-vystavba-lanovej-drahy-na-m)