Costain Limited (H7-Heathrow) · Contracts Finder

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Tender: Design Consultant for Replacement of T5D Rail-Tunnel Attenuators – Heathrow

Released 5 months ago

Closed09 Jun 2026

Est. valueEstimate£30K to £120K

LocationLondon

AgencyCostain Limited (H7-Heathrow)

SourceContracts Finder

CategoryInfrastructure

Submissions closedClosed Tue, 9 June 2026

About

Design consultant needed to replace four end-of-life attenuators in the T5D rail-tunnel ventilation shaft adjacent to T5D (north). The shaft is accessible from the bottom (Level 6) via the trackside of the HEX tunnel or from the top (Level 7) via airside. The work aims to remove debris risk to fans, tunnels and the station, prevent fan failure in fire scenarios, provide ventilation and smoke clearance for the Heathrow Rail Tunnels, improve system resilience and reduce maintenance. Each attenuator is formed of four quadrants weighing around 1160 kg. The consultant must review MEP systems along the airflow and advise on replacement or modification to bring them up to compliance. Surveys will be carried out by others employed by the Client under the direction of the Design Consultant. Required deliverables and capabilities include a Ventilation Resilience Report for the HAL Rail underground network, airflow modelling of the existing configuration with one fan and both fans operating and repeat modelling with the shaft subdivided to allow phased replacement, and the ability to specify replacement attenuators considering the constraints of an operational rail network. RIBA 5 onwards including construction is excluded.

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