Seamless Steel Penstock Pipe Section
Large diameter seamless penstock pipes for hydroelectric plants, non-alloy steel, OD >406.4 mm, wall <19 mm. Classifies HTS 7304.39.0076 as other seamless steel tubes. Carries water under pressure to turbines.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If welded longitudinal seam
Welded penstocks common for large diameters classify 7306.
If fabricated into complete turbine scrolls
Assembled hydraulic turbines include casing as machinery parts.
If internally insulated
Tanks/reservoirs with internal lining use 7309 heading.
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Import Tips & Compliance
• ASME B31.3 process piping code documentation required
• Hydrostatic test pressures must match design specs
• Segmented shipment declarations for long penstocks
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