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Article Date: 30th November 2015

Bells Marquee - City of London Project - Bloomberg

Power Generators - Generator Enclosures - Generator Installations

Bells Power - Generator

Whilst London was enjoying it's Indian Summer, Bells carried out, with St. Pauls and the breath taking skyline of London in the background, the complex installation of 2 off 11KV 1500KVA Generators in the roof plantroom area. Amongst the many tough challenges on the project Bells had to design the enclosures to meet 62 dB(A) @ 1Mtr whilst achieving vibration isolation of greater than 99.1%, all within a height constraint of 3100mm. The Generators are located directly above noise sensitive boardroom area, so noise and vibration transmission isolation were a priority when designing the system.

Bells were engaged prior to construction stage to work in partnership with the Architect, Consultants (Acoustic & M&E) and main contractor, to co-ordinate the design of the enclosure system to ensure both performance and spatial fit within the building constraints. Using a combination of studflex pads, acoustic base, high deflection anti-vibration mounts and viscous dampers Bells were able to provide a calculated solution to provide greater than 99.1% vibration isolation, in-turn this was complimented by a clever enclosure design to incorporate a 2500mm high generator into a 3000mm high enclosure, with self contained primary exhaust silencers as well as a 1000 litre day tank and MV Link Box, all finished in a RAL colour to match the roof screen.

The Generators and the enclosures where broken down into multiple sections to allow the site crane to offload them into position, where the Bells installation team re-coupled the alternators to the engines and re-assembled the enclosures on the roof ensuring that every section of the equipment was located into the correct position to ensure that the performance of the vibration isolation design was achieved. There were over 10 lifts per generator system and the entire process was carried out over 2 separate weekends, as the equipment was carefully dropped into position through the outer skeleton of the roof screen construction.

As part of the contract Bells were instructed to produce a MV Switchroom Enclosure to house the MV Switchgear, NER and Main PLC System that is located between the generator enclosures and too match their appearance.

James Murphy, Managing Director at Bells comments; "This marquee project allows Bells to demonstrate to the market our continued competence in delivering some of the most complex and difficult generator turnkey projects in London, with plant space becoming ever more restricted in modern buildings we have placed ourselves at the forefront of concept and innovation of design and installation of these types of turnkey generator installations."

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