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  3. Stacks, Silencers & Ducting
Oil & gas · Plant structures

Stacks, Silencers & Ducting

Vent stacks, silencer bodies and large-bore ducting: rolled plate, stiffened shells and supports, the same capability that builds our combustion chambers.

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Allmarc 3D model · to scale
Explore the model

How it is built.

Scroll: the camera moves to each part in turn and ends on the exploded view. Drag to turn it round yourself.

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A vent stack with silencer

Inlet ducting, a silencer body and a stack, with the access and supports that go with them.

Scroll to see how it is built · drag to turn it round

02 / 07

Rolled shells

Silencer bodies, conical transitions and stacks rolled from plate to the diameters your design calls for, with fit-up at the scale of a combustion-chamber course.

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Kept round

Stiffener rings hold thin shells round under wind and thermal load.

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Ducting

A flanged duct with a mitred elbow, a bellows expansion joint to take thermal growth, and a portal support under the run.

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Access

A ring platform at the silencer top and a caged ladder.

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Base

A base ring with 12 gussets.

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Every part, apart

Shells, rings, ducting, access and base.

Why Allmarc

Experience you can trust.

We fabricate to your drawings and prove the fit in our own bay before anything ships. Open any line for the detail.

Talk to an engineer
Structural steel at scale
  • 4 plants at Kanbha; about 6,000 T a month from November 2026.
  • Plate, sections and built-up members in house.
Trial-assembled
  • Fit-up proven in the works.
  • Match-marked for bolt-up on site.
Finished before dispatch
  • Blast, prime and paint in house; galvanised finishes on request.
  • Access steel fitted in the works.
Packed for the journey
  • Export packing we designed ourselves.
  • Shipped as numbered kits.
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Have a drawing? Let us build it.

We fabricate to your design, from plate to a packed container. An engineer will tell you honestly how we would build it.

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