Chennai Metro invites tender for VAC, TVS, SCADA and other allied works for 8 underground metro stations in Corridor-4 of Phase-2

Chennai Metro Rail Limited (CMRL) has invited digitally signed open e-tender for Design verification & validation, supply, installation, testing, commissioning, supply of spares & special tools, operations and maintenance during two (02) years Defect Liability Period (DLP) and five (05) years Comprehensive Annual Maintenance Contract (CAMC) for various works like Ventilation and Air Conditioning (VAC), Tunnel Ventilation System (TVS) and many more.

  • Tender Reference Number: CMRL/PHASE–II/SYS/C4-VAC&TVS-12/2023
  • Name of Work: Design verification & validation, supply, installation, testing, commissioning, supply of spares & special tools, operations and maintenance during two (02) years Defect Liability Period (DLP) and five (05) years Comprehensive Annual Maintenance Contract (CAMC) of Ventilation and Air Conditioning (VAC), Tunnel Ventilation System (TVS), Associated Electrical and integrated SCADA works for eight (08) underground stations in Corridor-4 (C4) from Lighthouse to Kodambakkam station, including C4 related TVS SCADA works at Thirumayilai station and Integrated Station Management Systems (ISMS) at OCC and BOCC.
  • EMD: INR 5.28 Crores
  • Duration of Contract: 1160 Days + DLP (2 Years) + CAMC (5 Years)
  • Document Download/Sale Start Date: 10th Oct, 2023
  • Document Download/Sale End Date: 08th Jan, 2024
  • Pre Bid Meeting Date: 08th Nov, 2023
  • Bid Submission Start Date: 02nd Jan, 2024
  • Bid Submission End Date: 08th Jan, 2024
  • Bid Opening Date: 09th Jan, 2024

Scope of Works:

VAC system scope of work includes the following:

  • Concourse & Platform Air-Conditioning & Ventilation.
  • Technical & office rooms Air-Conditioning & Ventilation.
  • Mechanical Ventilation of Ancillary Spaces & Plant Rooms.
  • Smoke Management System.
  • Staircase pressurisation system.
  • Underground parking Ventilation system.
  • Acoustic Treatment & Vibration control
  • VAC system is designed to operate in following mode
    • Normal Mode
    • Non-Revenue Mode
    • Ventilation mode
    • Emergency mode

The Contractor shall be responsible for Design Verification and Validation, Supply, Installation, Testing, Commissioning, DLP and CAMC of ISMS SCADA at stations, OCC & BOCC.

The Contractor shall follow the Part-2 Section VII Sub-Section-A – Scope of Design Verification & Validation document for the Design Verification & Validation of the ISMS SCADA system.

The Contractor shall Supply, Install, Testing, and Commissioning of ISMS SCADA system as per the BOQ mentioned in the Part-1 document. The Contractor shall follow the Part-2 Section VI Sub-Section-A – Works Requirements Chapter-12 RAMS & EMC Requirements.

The Contractor shall follow the Part-2 Appendix -2 Construction Interface Management Document for Interfacing with other Contractors. The Contractor shall provide training as specified in Chapter 10 of Part-2 Section-VI of this tender document.

The Contractor shall follow Packaging, Shipping, and Delivery as specified in Chapter -8 of Part 2 Section VI of this tender document. The Contractor should seek prior approval for every equipment, supplier, and vendor from the Employer/Engineer. The selection of Vendor shall be from the list of likelihood vendors as mentioned in Part-02 Appendix-6.

ISMS SCADA System shall Control and Monitor of all the services including VAC/TVS/E&M equipment during normal, congestion and emergency conditions from Station Control Room, Operational Control Centre (OCC) and Backup Operational Control Centre (BOCC). 

The ISMS SCADA shall provide relevant data / information, which would enable maintenance staff to assess the need for maintenance based on condition monitoring and unscheduled preventive maintenance based on degradation of normal operating parameters.

The Contractor shall develop graphical SCADA screens for all UG stations, OCC & BOCC as per the Employer/Engineer requirements. The station integrated SCADA system shall analyse data & give the reports for asset management, inventory management, energy management, condition base monitoring & generate statistics reports on the type of component & equipment failure in the station. ISMS shall assist the maintenance team for preventive & corrective maintenance.

Development and submission of ‘V’ life cycle documents shall be as per EN 50128:2011+A2:2020(Latest Version). The ISMS Contractor shall support ISA for the SIL-2 certification for the proposed ISMS System. All relevant supporting documents as per the standard shall be submitted to the Employer.

The C4-VAC&TVS-12 contractor will be responsible for sealing with fire rated material of all openings left due to SCADA works. Thirumayilai interchange station, Corridor-4 related TVS System Control and monitoring is under the C4-VAC&TVS-12 contractor scope which includes Design Verification and Validation, Supply,

Installation, software development, Testing and Commissioning, DLP and CAMC of required Redundant SIL-2 Hot-standby PLC and associated modules, SCADA equipment, cables, cable trays, conduits, Panels & associated components and Etc.,

Thirumayilai station Corridor-4 related TVS System SCADA integration with OCC & BOCC is part of the C4-VAC&TVS-12 Contractor scope. The Tunnel Ventilation System (TVS) for Chennai Metro Phase 2 has been designed to meet the operation and services objectives (i.e., to provide safe, comfortable, and efficient transport services to the passengers) and forms an integrated part of the overall rail system. TVS is provided in a subway system essentially to carry out the following functions:

  • Underground network pressure relief during normal operation,
  • Maintain pressure transients caused in the station areas within acceptable limits so that no adverse effects on wayside equipment, including PSDs, are occurring,
  • Maintain tunnel and trackway temperatures during normal and congestion operations within 40°C and 45°C, respectively.
  • Ventilation during maintenance periods, if required,
  • Tunnel cooling during non-revenue hours, if required (not foreseen),
  • Removal of smoke and supply of adequate fresh air during emergency conditions, while preventing back-layering for safe egress of passengers and allowing fire-personnel to reach the incident location for firefighting.
  • To fulfil these requirements, it is possible to adopt different strategies and arrange fan equipment rooms in various ways. In Chennai Metro Phase 2, two different strategies are implemented, based on the station typology.
  • In island platform stations, a single fan room accommodating two fans (one working + one standby) at one end of the stations, and connection to the other end through an under-platform duct has been proven to serve the above TVS objectives.
  • The stacked stations have two fan rooms, one at each end of stations, each accommodating two fans (one working + one standby). This is required due to limited space in the under-platform area to accommodate the transfer ventilation duct.


  • Integrated SCADA system for the Corridor-4 UG Stations in OCC & BOCC is under the C4-VAC&TVS- 12 (hereinafter referred to as “TVS12”) Contractor Scope. The Station SCADA system shall communicate with the OCC & BOCC SCADA system which will be provided by the ‘TVS12’ Contractor via the Communication Backbone Network (CBN).
  • The TVS12 Contractor shall be responsible for the integration of Corridor-4 UG Stations TVS, VAC& E&M system and Thirumayilai station Corridor-4 related TVS System, Control and Monitoring functions in the OCC & BOCC level.
  • ISMS SCADA equipment and software in the OCC & BOCC shall be provided by the TVS12 Contractor. All the control points in the stations shall be passed to the OCC & BOCC. Data transfer between OCC&BOCC SCADA System and Station SCADA System (Corridor-4 UG Stations and Thirumayilai station Corridor-4 related TVS System) via communication backbone network.
  • The TVS12 Contractor should ensure without distortion of handshaking between OCC&BOCC and Stations. OCC & BOCC SCADA control strategies are under the TVS12 Contractor scope.
  • The TVS12 Contractor shall develop an OCC & BOCC SCADA screen, which is capable of handling the integration of Corridor-4 (8 Stations) UG Stations and Thirumayilai station Corridor-4 related TVS System.
  • The TVS12 Contractor shall be responsible for developing the mode of operation for TVS system from OCC & BOCC level for Corridor-4 (8 Stations) UG Stations and Thirumayilai station Corridor-4 related TVS System.
  • The TVS12 Contractor shall be responsible for developing mode of operation, control & monitoring of VAC system and E&M System from OCC & BOCC level for Corridor-4 (8 Stations) UG Stations.
  • The TVS12 Contractor shall configure and commission the OCC & BOCC ISMS SCADA system to match the key dates for the TVS02 Contractor, to enable complete Corridor-4 (8 Stations) UG Stations and Thirumayilai station Corridor-4 related TVS System ISMS System operations. The TVS12 Contractor shall coordinate with the TVS-02 contractor to commission the OCC & BOCC ISMS SCADA system.
  • The completion of the SCADA system at OCC & BOCC will be based on the project program. Therefore, testing and commissioning shall be provided to ensure the stations in service are fully functioning.
  • Precautions shall be taken, and necessary planning shall be done for testing and commissioning of Thirumayilai station Corridor-4 related TVS System. Additional commissioning plan and methodology shall be submitted for approval before the work is implemented on the Thirumayilai station Corridor-4 related TVS System.

Defects Liability Period:

  • Employer/Engineer shall provide a list of defects, shrinkages or other faults or requiring to be completed any items of incomplete work which are present in the Works at Operational Acceptance Certificate, and which is the responsibility of the Contractor to complete or make good.
  • Defects are generally regarded to include any deficiency in the quality of the works including defects due to faulty material or workmanship. This may extend to design where it is part of the Contractor’s responsibilities.
  • Within a reasonable period after such a schedule of defects is issued by the Engineer, the Contractor shall ensure that the items properly specified in the schedule of defects are made good or completed in accordance with the Contract to the reasonable satisfaction of the Engineer/ Employer and at no additional cost to the Contract.
  • The rectification and/or replacement work shall be subject to a further period of twelve (12) months apart from the defects liability period of twenty-four (24) months. If the defect is not remedied within a reasonable time Employer may arrange the rectification of the Work at the risk and expense of the Contractor.
  • During the defects liability period, the contractor shall take reasonable steps to protect the equipment from any kind of water leakage/ingress.
  • If during the defects liability period any defect is found, the Contractor must, promptly and at its cost repair, replace or otherwise make good (in consultation with the Employer) the defect as well as any damage to the facility caused by the defect. The Contractor will bear all incidental costs, including any costs of removal associated with the repair, replacement or making good of the defect or damage.
  • If in case the contractor is not able to rectify the any faults/Defects within the permissible time of fault rectification as mentioned in chapter-20, then Employer will raise the Non-Compliance Report(NCR) and may carry out the above left-over work from a third party contractor on risk and cost basis and the two time of total expenses for rectification of defects shall be recovered from the payments withheld amount with Employer.
  • The contractor shall set the permissible time of fault rectification as mentioned in chapter-20 for each installed equipment before starting the DLP period. If the time is not specified for any issue, then Employer will instruct time to follow for each such case.

Comprehensive Annual Maintenance Contract:

  • The scope of assistance for maintenance activities shall refer to the definition of maintenance standard of European standard EN 13306 and shall cover all scheduled and unscheduled maintenance required including all routine inspections and service overhauls on VAC/ TVS/SCADA/ Associated panels and electrical works.
  • Maintenance work shall include fault finding following report of incidents and repair of equipment changed in the course of fault rectification during comprehensive Annual Maintenance of 5 years after successfully obtaining DLP completion certificate.
  • The five-year Comprehensive Annual maintenance contract of TVS/VAC/SCADA systems and associated Electrical works shall be executed in all UG Stations. All TVS, VAC, associated Electrical and SCADA systems installed in the underground stations are covered under CAMC including the variation quantity.
  • The contractor shall read the scope of works for CAMC in conjunction with part-02 Chapter 21 of Operational & Maintenance. Hereafter are examples of Tasks that could be requested for assistance. This includes Management and Planning assistance as well as Technical assistance.
  • Provide recommendations in respect of philosophy and procedures for repairs of VAC/TVS systems and the scale of facilities required to be set up in the Workshops for this purpose. Preparation of detailed maintenance plan for the routine servicing of any equipment which requires such service.
  • Preparation of a detailed staffing for each and every different inspection, overhaul and repair activity. The plan shall also identify and quantify resources required by staff and groups of staff in terms of tools, tackle, protective clothing, etc.
  • Preparation of a detailed quality plan, covering all maintenance activities. Based on the plan the contractor shall obtain ISO-9001 certification for the maintenance organisation. Preparation of a computer-based Stores Management Plan, which shall assist the management, ensuring a timely availability of spares, tools and consumable materials with a low level of inventory.
  • Setting in position a computerised defects and failure analysis and documentation system, based on FMEA principles for all systems, sub- systems and components. All tools and tackles necessary for the contract shall be procured and engaged by the contractor at his own cost Provide recommendation on efficient supervision of the maintenance, overhaul and repair activities of maintenance staff to ensure high quality work and productivity.
  • This shall also include planning and supervision of on- going training and retraining as required in the correct procedures using the training materials and courses supplied under the Contract.

Operation and Maintenance:

  • Operation and Maintenance of Tunnel Ventilation System (TVS), Air Conditioning system, Associated Electrical and ISMS system for installed equipment in the stations and OCC/BOCC during the DLP & CAMC Period Carry out the Operations, Preventive and Breakdown maintenance as per Employer’s Requirements for VAC/TVS systems.
  • The Stations are required to be monitored for the proper working of the VAC/ TVS System. Before starting the Revenue service, the healthiness of the VAC/TVS system to be ensured.
  • Daily/Weekly/Monthly/Quarterly Check to be made and submitted to Employer for approval Ensure that the required temperature is maintained at Platform & Concourse level. Record the temperature at fixed intervals as per EMPLOYER requirement and to be communicated to OCC/BOCC. Continuous monitoring of VAC/TVS for proper working.
  • Any abnormalities including breakdowns noticed in VAC/TVS to be informed immediately to the Maintenance in charge. Deployment of minimum staff for maintenance services as per chapter 21 of part-02. The Contractor shall depute experienced and competent personnel for Operations / Checks including maintenance, having minimum qualification as detailed in Employer’s Requirements.
  • The contractor shall maintain a minimum stock of spares and consumables as mentioned in chapter 19 & 20 of Part-02 and also this chapter of Employer’s Requirements Set up a mechanism for removal and/or disposal of waste generated during DLP & CAMC Operation & Maintenance works.
  • The Contractor shall keep Mobile app-based attendance system for O&M staffs and DLP/CAMC Staffs. It has to be monitored through Central Server accessible to Employer. All tools and testing equipment required for day-to-day monitoring/maintenance purpose shall be the responsibility of the contractor. The cost for consumables shall be by the contractor.
  • The contractor shall render all software support and undertake appropriate upgradation/ modification for satisfactory performance of existing software installed in the ISMS Systems in coordination with the DLP/CAMC team.
  • During the O&M period, the contractor shall take reasonable steps to protect the equipment from any kind of water leakage/ingress. The contractor shall submit breakdown reports as per Annexure-1 of this chapter-21.
  • The Contractor shall maintain the Comprehensive Maintenance Management System (CMMS) during the DLP & CAMC Period. The cost involved in maintaining the Cloud storage and software upgradation is the Contractor’s responsibility during the DLP & CAMC Period.
  • All other works as specified on Employer’s Requirement (Part -02 Technical Specification, Part-02 Chapter 19, 20) and any other work which are essentially required for smooth functioning of the TVS/VAC systems.
  • Each O&M staff should have a Smart mobile phone to access the app and GPS locator enabled to track the staff location. The Contractor must arrange common CUG mobile numbers for O&M staff and DLP/CAMC Staffs.
  • The Contractor shall send two O&M staff per quarter to external training at reputed institutes in India. The cost of training shall be borne by the Contractor. The Contractor shall provide the toolbox rack/steel Almirah for keeping the tools safely in each station. The Contractor shall provide the furniture (Tables and chairs) for the deployed personnel in each station.
  • The Contractor shall submit a monthly O&M report consisting of operational/breakdown issues and their rectification, preventive/breakdown maintenance carried out, energy/water/chemical consumption, periodic functionality of non-operative equipment, and availability of spares/ consumables for each station.
  • The daily operation/Checks shall cover the daily checklist and ensure the TVS/VAC system is operational for 24 hours X 7 days per week during the contract period.


Minimum average annual turnover of INR 210 Crores, calculated as total certified payments received for contracts in progress and/or completed, within the last 5 years divided by 5 years.


Contractor (single entity or JV member) or subcontractor must have been completed between 01st January 2013 and bid submission deadline. And shall meet the following eligibility criteria for being considered as qualified in technical evaluation and become eligible for financial package opening.

Successfully completed and under implementation of Supply, Installation, Testing and commissioning of VAC and/or TVS, along with/without associated Electrical & SCADA/BMS works in Underground Metro stations/ Elevated Metro Stations/ Airports/ railway projects/Highway projects /large infrastructure projects with any of the following criteria.

  • One (1) Work of value INR 102 Crores or above, or
  • Two (2) Works of each value INR 61 Crores or above, or
  • Three (3) works of each value INR 51 Crores or above.

The complete documents can be downloaded from

Source: CMRL- Tender  | Image Credit (representational): Chennai Metro