Boiler Tube Capability Envelope Calculator

ABOKE

Check if your tube spec falls inside ABOKE’s bend-radius envelope, calibrated to ASME PG-79 and ASTM A213.

Tube Outside Diameter (mm)

Wall Thickness (mm)

Material Grade

Target CLR (multiples of OD)

Capability Envelope Check

Tube:

Target CLR:

ABOKE envelope floor:

Recommended ABOKE tier:

Heat treatment:

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Envelope floors follow cold-bend, booster-assisted operation. Tighter radii may be achievable on selected sizes via intrados induction heating per USPTO US7,231,798. Always confirm against the project-specific PFI ES code revision in effect at fabrication.