Grün Engineering
Crane lifting the freestanding steel mast upright at a glasshouse site
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Flagship project Biomass flue and mast GE1745

Glasshouse biomass plant

A Ø400 twin wall biomass flue carried to 14 m on a free-standing steel mast at a glasshouse site.

Site
Glasshouse biomass plant
Town
Wisbech, East of England
Sector
Horticulture
Status
Complete

Key facts

twin wall insulated biomass flue
Ø400
termination height on a 13 m mast
14 m
continuous, 200 Pa positive pressure
600°C
M30 grade 8.8 holding-down bolts
12
continuous site visit to install
1

The challenge

A biomass boiler at a glasshouse site needed its flue carried to a termination 14 m above ground.

The flue needed its own free-standing support, and the foundations were being built by another contractor.

The base had to be right first time, before any steel arrived.

What we did

We designed a turnkey package: one Ø400 twin wall insulated flue and one free-standing post mast in S355J0 steel, modelled as a free-standing steel chimney.

The wind basis (UK zone WZ1, 22.5 m/s) was written into the design and checked.

We issued the base loads, 19.4 kN shear and 148 kNm moment, with a twelve-bolt holding-down template ahead of the groundworks.

A lift plan covered pre-lift checks, toolbox talks and sign-off. Delivery came by HIAB, and the mast went up by crane and MEWP.

The result

The flue and mast went in during one continuous site visit, in normal working hours.

The base was right first time because the bolt template was with the groundworks team before they poured.

The flue terminates 14 m up on the 13 m mast.

On site.

6 photographs. Tap a photo to see it larger.

Glasshouse biomass plant, Wisbech. The mast being lifted upright by crane.
Glasshouse biomass plant, Wisbech. Mast and flue on the crane, with the glasshouses behind.
Glasshouse biomass plant, Wisbech. Lifting the mast over the plant building.
Glasshouse biomass plant, Wisbech. Flue sections delivered and lifted in by crane.
Glasshouse biomass plant, Wisbech. The flue at the boiler end, inside the plant building.
Glasshouse biomass plant, Wisbech. The flue connection at the boiler.

The drawing.

From the design pack.

Front and side elevation drawings of the flue on its mast beside the biomass plant building
Front and side views from the design pack: flue, mast and plant building.

Finishing details

The details we leave behind.

  • Mast being lowered on the crane

    Holding-down bolts

    Twelve M30 grade 8.8 bolts set from our template, so the mast base landed first time.

  • Flue fixed to the mast on brackets

    Flue on the mast

    The flue is carried on brackets up the mast, finishing 14 m above ground.

  • Twin wall flue beside a biomass boiler

    Inside the plant building

    Twin wall insulated from the boiler connection, rated for 600°C continuous.

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.

  • Design and structural calculationsMast modelled as a free-standing steel chimney
  • Foundation interfaceBase loads and the holding-down bolt template
  • Design pack drawingsFront, side and mast views
  • Lift planPre-lift checks, toolbox talks and sign-off

Related services

Industrial chimneys and stacks Steelwork and supports Design and calculations

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