Grün Engineering
Stainless twin wall generator exhaust offset held in a galvanised channel frame on rubber feet on a roof
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Flagship project Generator exhausts GE1587, GE1929

25 North Colonnade

Generator exhausts for a Canary Wharf office building, in two phases, with the roof section held on a frame on rubber feet.

Site
25 North Colonnade
Town
Canary Wharf, London, London
Sector
Commercial offices
Status
Complete

Key facts

phases, 2020 and 2021
2
header off two Ø200 primaries, phase 1
Ø400
stack and 5 m horizontal, phase 1
12 m
generator, phase 2
900 kW
gas temperature rating, phase 2 system
1,000°C

The challenge

The building needed new exhausts for its standby generators, run from the plantroom up to roof level.

Phase 1 took two generator outlets into one stack. Phase 2 added a 900 kW set, with exhaust gas up to 1,000°C.

At the top the stack had to be held in place on a finished roof, among the louvred plant screens.

What we did

Phase 1: two Ø200 primaries off the generator outlets into a Ø400 header, then a 12 m stack, all twin wall insulated.

Phase 2: a Ø300 and Ø375 twin wall insulated system from a Ø250 outlet, rated for 1,000°C at 5,000 Pa, with offsets to suit the route.

At roof level the offset is held in a galvanised channel frame standing on rubber feet in the gravel.

Supports at high level clamp each stack to the plant steel.

The result

Site photos date phase 1 to June 2020 and phase 2 to March 2021.

The roof frame sits on the gravel without cutting the roof finish.

On site.

4 photographs. Tap a photo to see it larger.

25 North Colonnade, Canary Wharf, London. Phase 2: the offset held in a channel frame on rubber feet.
25 North Colonnade, Canary Wharf, London. Phase 2 stack clamped to the plant steel, with its cap still wrapped.
25 North Colonnade, Canary Wharf, London. Channel upright in its rubber foot, sitting on the gravel.
25 North Colonnade, Canary Wharf, London. Phase 1: primaries rising from the generator outlets.

Finishing details

The details we leave behind.

  • Rubber foot under a channel upright

    Frame on rubber feet

    The roof frame stands on rubber feet in the gravel, so the roof finish is not cut.

  • Stack clamped to plant steel

    Clamped to the plant steel

    Each stack is clamped to the existing plant steel at high level.

Handover

What the client got.

The documents on record for this job. Handover documents normally go into the customer's project folder before the engineers get home.

  • Flue sizing calculationsFrom the generator information
  • Working CAD drawingEach phase
  • Job-specific RAMSEach phase
  • Site photosJune 2020 and March 2021

Related services

Generator exhausts and silencers Steelwork and supports Design and calculations

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