Fallpipe Towers & Rock Chutes

01 / 08

Rock placed where it is needed

Rock protects cables, pipelines and foundations on the seabed. A fallpipe guides it down from the vessel so it lands in the right place. We fabricate the tower and the pipe; we do not install.

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

02 / 08

Tower frame

A braced tower over the moonpool carries the weight of the whole pipe string. Columns are end-milled and drilled so the lifts bolt up square.

How is it possible at Allmarc?

Kotec newRun10DX CNC beam drilling lineH-beams up to 1,000 x 500 mm

Used here for: Tower frame

Heavy profiles that need precise holes, where plasma cannot do the job: the lower structure and panel borders of a ground flare, and every bolted PEB and multi-storey frame.

• H-beams up to 1,000 x 500 mm
• Drills 3 faces in one pass
• Channels, angles and box sections

All our machinery

SKDX1030 CNC end-face millingMills beam and column ends square for bolted splices

Used here for: Tower frame

• Mills beam and column ends square for bolted splices

All our machinery

03 / 08

Fallpipe sections

Sections are rolled from plate and flanged at both ends. They are added one by one until the pipe reaches the seabed.

How is it possible at Allmarc?

Three-roll pinch cum pyramid plate rollsRolls plate up to 40 mm

Used here for: Fallpipe sections

• Rolls plate up to 40 mm

All our machinery

Submerged-arc (SAW) welding lineFull-penetration welds on built-up sections

Used here for: Fallpipe sections

• Full-penetration welds on built-up sections

All our machinery

04 / 08

Section rack

A rack on deck holds the sections between jobs, each in its own saddle.

05 / 08

Hopper and chute

Rock comes up a chute into a hopper at the top of the pipe. Both are plate, and both can be lined with wear plate.

How is it possible at Allmarc?

Deratech Supera-H 12030 fibre laser20 kW

Used here for: Hopper and chute

In 2024 we were the only buyer of Deratech’s 20 kW, 12 m laser.

• 20 kW
• 12 x 3 m bed
• Pallet changer

All our machinery

Deratech 8 m tandem press brake8 m bending length

Used here for: Hopper and chute

• 8 m bending length
• Tandem technology

All our machinery

06 / 08

Pipe clamp

A clamp at deck level holds the string while a section is added or taken off.

07 / 08

Made to your drawing

Send the general arrangement or a sketch with sizes and loads. We detail it, fabricate it, trial-assemble it in our bay and pack it for sea. The model is a typical arrangement, not a delivered project.

08 / 08

Every part

Tower, pipe sections, rack, hopper, chute and clamp.