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The COSTAIN LIMITED (H7-HEATHROW) has issued a Tender notice for the procurement of a Wp1140 - T5d Design Consultant in the United Kingdom. This Tender notice was published on 03 Jun 2026 and is scheduled to close on 09 Jun 2026, with an estimated Tender value of GBP 5000000. Interested bidders can access detailed Tender information, eligibility criteria, and complete bidding documents by referencing TOT Ref No. 142525421, while the tender notice number is C4N113536273 and Registering on the platform.
Procurement Summary
Country: United Kingdom
Summary: Wp1140 - T5d Design Consultant
Deadline: 09 Jun 2026
Posting Date: 03 Jun 2026
Other Information
Notice Type: Tender
TOT Ref.No.: 142525421
Document Ref. No.: C4N113536273
Competition: ICB
Financier: Self Financed
Purchaser Ownership: Public
Tender Value: GBP 5000000
CPV Classification
71320000 - Engineering design servicesPurchaser's Detail
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Login to see detailsTender Details
The T5D Rail-tunnel Ventilation Shaft is located adjacent to T5D at its North and can be accessed from the bottom (Level 6) via the trackside of the HEX tunnel or from the top (level 7) via Airside.
The objective is to replace the four attenuators in the T5D Shaft because they are at their end of life. The renewal of the T5D attenuators aims to reduce the risk of debris entering fans, tunnels and station, prevent the fans from failing in any fire scenario and provide ventilation and smoke clearance for the Heathrow Rail Tunnels. This improves safety conditions within Heathrow Rail Tunnels and improves resilience of systems. In addition, less maintenance and repair are required for the attenuator.
Each attenuator is formed of four quadrants weighing around 1160 kg.
Review MEP systems along the airflow and advise replacement/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
Item Question
Q1 Do you have experience with Underground rail network ventilation resilience?
Requirement: Ventilation Resilience Report required for the HAL Rail underground network.
Q2 What capability do you have of air flow modeling for fans / attenuators etc.?
Requirement: Model the existing configuration with one fan operating, and both fans operating and then repeat the modelling with shaft sub divided to allow one set of attenuators ...
Location Of Contract : London
Industry : Engineering design services - 71320000
Value Of Contract : £2, 500, 000 to £5, 000, 000
Published Date : 2 June 2026
Closing Date : 9 June 2026
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