Source: https://tendernation.io/opportunities/01a13bd5-906b-7370-af60-c3743b99b877/3-cryogenic-vent-stack-with-changeable-terminations closed GB open procedure # 3" Cryogenic Vent Stack with Changeable Terminations [Health and Safety Executive](https://tendernation.io/buyers/health-and-safety-executive) Estimated value £25,000 Published 11 Feb 2026 Deadline Closed 6 Mar 2026 ## Who can bid - Below-threshold contract Buyers cannot shortlist bidders on suitability before tenders are in, so everyone gets to submit a bid (except some larger works contracts). [Procurement Act 2023, section 85](https://www.legislation.gov.uk/ukpga/2023/54/section/85) - Open procedure Anyone can submit a full tender; there is no shortlisting stage. ## About this tender HSE require a 3" vent stack for use with cryogenic hydrogen for an experimental programme. The vent must have interchangeable terminations (miter cut, bullhorn, lambda) which may be on a flanged connection or otherwise joined. The vent stack should be 4 m tall and terminate in a 3" ANSI Class 300 flange. 0.5 m from the top there should be two bosses with ¼" BSP female fittings and another boss with a 7/16" UNJF female fitting. The vent stack must have a maximum allowable working pressure of 40 barg. The vent stack should have a manual drain valve at the bottom of the stack which is spring loaded (normally closed). 1.5 m from the bottom of the vent stack should be a 3" ANSI flange connection and a 1½" ANSI flange connection. Both these flanges must be Class 300. The vent should come with 3 interchangeable termination designs which are on 3" ANSI Class 300 flanges to attach to the top of the vent stack. Suitable gaskets and torque values/calculations for all flanges should be provided. See In-tend for full requirements ## CPV classification Pipeline, piping, pipes, casing, tubing and related items Source Find a Tender (UK) · Notice ocds-h6vhtk-064e2b-2026-02-11T15:18:32Z [View official notice](https://www.find-tender.service.gov.uk/Notice/ocds-h6vhtk-064e2b-2026-02-11T15:18:32Z) 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 Health and Safety Executive: past awards and live tenders](https://tendernation.io/buyers/health-and-safety-executive) [Sector More Construction materials & structures tenders](https://tendernation.io/sectors/construction-materials) ## More tenders like this [Drinking-water piping – Lieferung von Material für die Trinkwasserversorgung (PE-HD-Rohr) für die Trinkwasserversorgung der KOOPERATION WASSER. · Trinkwasserverband Stader Land · 29 days left · 17 Nov 2026](https://tendernation.io/opportunities/01a15183-0b9d-724a-b3ac-6a1b5383af17/germany-drinking-water-piping-lieferung-von-material-fur-die-trinkwasservers) [Construction materials – Fornecimento de Materiais de Construção Civil para o ano de 2027 · Município de Lagoa (Açores) · 27 days left · 14 Nov 2026](https://tendernation.io/opportunities/01a15183-1411-7299-9481-e5274c3efd59/portugal-construction-materials-fornecimento-de-materiais-de-construcao-civi) [Modular and portable buildings – Fourniture, livraison et installation de 5 habitations légères de loisirs (HLL) au camping de la Colombière a Pesmes · Communauté de Communes Val de Gray · 28 days left · 16 Nov 2026](https://tendernation.io/opportunities/01a15183-5cdd-730e-a2d6-1022e299032b/france-modular-and-portable-buildings-fourniture-livraison-et-installation) [Smiths' wares – Fournitures d'atelier : Serrurerie - Quincaillerie · Nievre Habitat · 29 days left · 17 Nov 2026](https://tendernation.io/opportunities/01a15183-c593-71cf-99c0-59c343efbbd0/france-smiths-wares-fournitures-datelier-serrurerie-quincaillerie) [Building materials – Dostawy materiałów ogniotrwałych formowanych · Sieć Badawcza Łukasiewicz-Instytut Metali Nieżelaznych · 18 days left · 6 Nov 2026](https://tendernation.io/opportunities/01a15183-4d1a-7143-ae91-f1f0c3bdd6a9/poland-building-materials-dostawy-materialow-ogniotrwalych-formowanych) [Building materials – Fourniture de matériels et matériaux · Ville de Saint-Just Saint-Rambert · 29 days left · 16 Nov 2026](https://tendernation.io/opportunities/01a15183-1461-73f3-8616-e84751ddcbff/france-building-materials-fourniture-de-materiels-et-materiaux)