SNAM HQ Symbiosis Edif. F

PROJECT DESCRIPTION

The intervention concerned the new construction of Snam’s HQ, identified as Building F, located within the redevelopment district known as “Symbiosis” in Milan.
It consists of 13 above-ground floors intended for offices, cafeteria, bar and training rooms, 1 ground floor intended for entrance hall, exhibition space, auditorium and outdoor park, and 2 basement floors intended for technical rooms and parking garage.

Tekser is involved in this project carrying out the Preliminary Design phase, the Detailed Design phase for obtaining the Building Permits, and the Construction Design phase, which constitutes the engineering development of all the works outlined in the previous phase, fully defining every MEP detail of the intervention to be carried out, in compliance with the budget established during the Detailed Design phase.
The Detailed Design and Construction Design phases were carried out using BIM methodology with “LOD D” level of detail.
Tekser is currently carrying out the Specialist MEP Works Supervision, which is still ongoing.

The MEP Design included:
• Thermal carrier fluid generation plant based on 4-pipe air-source multifunction heat pump units;
• Fluid distribution substation serving the utilities (room terminal units, AHUs) through variable flow pumping groups;
• Air handling units, divided into: primary air AHUs for office areas equipped with radiant terminal units (radiant ceiling islands); all-air AHUs for areas with higher occupancy rates (cafeteria, lounge bar, auditorium…); for shell & core areas, AHUs and air ducts up to the perimeter are in any case предусмотрены;
• Plumbing and drainage systems;
• Fire protection water system (hydrants, hose reels and sprinklers);
• Mechanical pressurization system for smoke-proof lobbies;
• Smoke extraction system on all floors of the building;
• Mechanical ventilation system for smoke control in the underground parking garages;
• Building Management System (BMS);
• Systems serving external tanks;
• Provisions (space within vertical shafts) for systems associated with the tenant fit-out (IT room air conditioning), provision of ductwork for kitchen hoods, etc.;
• Utility intake substation;
• Medium-voltage transformer substation + power center;
• Generator set serving the priority / life safety loads of the building;
• Uninterruptible power supply units serving the safety systems;
• Main electrical switchboards;
• Floor electrical switchboards (with scope of supply limited at floor level to the protections related to workstation power outlets);
• General distribution;
• Electrical lighting systems in open-space configuration in the absence of a layout hypothesis and according to the configuration of a sample layout agreed with the Client for identifying the visual area of workstations;
• Service power electrical systems;
• Electrical systems serving the mechanical systems;
• Electrical systems for electric vehicle charging systems on the first basement parking level;
• Passive structured cabling system and active devices serving the building regulation and automation / control systems;
• Voice evacuation sound distribution system;
• Fire detection system;
• Intercom system for refuge areas;
• Building and lighting control system (BMS);
• Photovoltaic system in compliance with legal requirements, increased by 30%;
• MEP provisions required to guarantee correct operation.

From the standpoint of thermal and cooling generation, as anticipated, the chosen solution is a 4-pipe hydronic system. In particular, air-source multifunction heat pump units are envisaged for summer and winter air conditioning.
The multifunction units allow heat recovery both during operation as a chiller and in heat pump mode. This function makes it possible to simultaneously produce hot and chilled water on two separate circuits (4-pipe system), regardless of the fluid temperature on the auxiliary heat exchanger.
The offices will be air-conditioned by means of a mixed system consisting of primary air and radiant islands with aluminum panels in order to maximize performance during the summer season.
Thanks to the simultaneous presence of the two fluids, automatic zone switching will be provided to supply the radiant islands with the most suitable fluid according to indoor environmental conditions.
Supplementary fan coils with full recirculation will be provided at points characterized by maximum solar load, where the radiant islands are insufficient to offset the room sensible load. The supplementary fan coils will be served by a two-pipe network.
Primary air will be supplied directly through the radiant islands by means of perforated panels complete with a plenum fixed to the upper part of the panel. Return air will be extracted through return grilles located above the radiant islands.

MEP Works Supervision Activities (DLI)

The Mechanical and Electrical Works Supervision (DLI), supporting the General Works Supervision (DLG), was carried out during the installation phase through periodic site visits by our specialist engineers, with an average frequency of approximately 1 or 2 visits per week.
During these activities, it was verified that the works were executed in accordance with the issued construction design and the relevant technical documentation. Assistance was provided through periodic site inspections rather than continuous on-site presence.
The DLI acted as a technical interface between the Client and the Contractor, with the objective of ensuring the correct execution of the MEP works in accordance with good engineering practice and sound construction standards.
During the construction phase, the following main activities were performed:
– verification of the correct execution of MEP works in accordance with the construction design;
– issuance of technical instructions and operational directions to the contractor during site inspections;
– periodic monitoring of the progress of installation works;
– support to the General Works Supervision in monitoring compliance with the project schedule.

The MEP Works Supervision activities were also supported by back-office technical activities carried out throughout the entire project duration, including:
– assistance to the General Works Supervision in the multidisciplinary coordination of MEP activities;
– participation in technical meetings with the contractor for the development and coordination of the construction design;
– review of the construction design prepared by the contractor;
– review of submittals related to materials and MEP components proposed by the contractor.

Assistance with Functional Testing of Building Systems

Within the scope of the MEP Works Supervision activities, assistance was also provided to the contractors during the execution of functional testing of the building systems.
Verification activities were carried out in compliance with the applicable regulations and established engineering best practices, supporting the contractors in the correct execution of the tests and in the verification of system performance.
On behalf of the Client, the MEP Works Supervision also performed technical oversight of the MEP contractors during the verification and testing activities under their responsibility, ensuring the proper execution of the tests and the compliance of system performance with the requirements set out in the project documentation.

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