Pressure Vessel

Industry challenges

Pressure vessel fabricators must control shell roundness, end pre-bending for weld quality, and capacity across a range of thicknesses while documenting process capability for quality systems.

Forming process steps

• Map design thickness and material yield to machine capacity tables.
• Pre-bend ends (especially critical on 4-roll lines) to reduce flat ends.
• Roll multi-pass to diameter; measure and correct as needed.
• Weld, re-round if required, and proceed to heads/nozzles assembly.

Recommended EZHONG equipment

Use 3-roll plate bending machines for heavy thickness flexibility and 4-roll machines when end pre-bending productivity matters. Long tank-style shells may fit tank plate rolling machines.

Typical parameter ranges

Typical published model examples: 4-roll series about 20–120 mm without pre-bend (model-dependent); 3-roll series examples from about 20 mm to 270 mm class; always derate for higher yield materials.

Related project evidence

See pressure-vessel related references in project cases and request a capacity confirmation for your code material.

3-roll or 4-roll for pressure vessels?

Choose 4-roll when you need efficient end pre-bending and shorter operator ramp-up. Choose heavy 3-roll variable-geometry when maximum thickness or wide cone flexibility dominates. EZHONG can compare both on your plate list.

Does material grade change machine selection?

Yes. Higher yield strength reduces effective thickness capacity. Always state yield strength (MPa) with thickness and width when requesting a model recommendation.

What should a quotation package include?

Thickness/width matrix, material grades, diameters, pre-bend requirements, annual tonnage, and delivery region. Start at Contact.