Tender: Replacement of Four Attenuators and MEP Survey for T5D Ventilation Shaft – Heathrow Rail Tunnels

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Client is seeking an MEP subcontractor to survey and replace four end-of-life attenuators in the T5D rail-tunnel ventilation shaft adjacent to T5D, carrying out survey and RIBA 4iii scope to support design. The scope includes reviewing MEP systems along the airflow, advising replacement or modification to bring systems up to compliance, and replacing the attenuators to reduce debris risk, prevent fan failure in fire scenarios, and improve ventilation and smoke clearance for the Heathrow Rail Tunnels. The T5D shaft can be accessed from the bottom (Level 6) via the trackside of the HEX tunnel or from the top (Level 7) via Airside; each attenuator is formed of four quadrants weighing around 1160 kg. Surveys will be carried out by the MEP subcontractor under the direction of the Design Consultant employed by the client, and RIBA 5 onwards including construction is excluded.