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API 650

API 650 — Welded Steel Tanks

API 650 covers design and construction of aboveground welded storage tanks operating at atmospheric pressure.

Pressure: Up to 2.5 psi

Tank Type: Vertical cylindrical

Fluids: Crude oil, diesel, chemicals

Roof Types: Fixed, floating

Diameter: Up to 100m+

Foundation: API Annex B

  • Shell thickness design per hydrostatic method
  • Bottom plate minimum 6 mm
  • Seismic & wind design considerations

API 620 — Low Pressure Tanks

API 620 is used for low-pressure storage tanks including cryogenic applications.

Pressure: 0 – 15 psi

Temperature: Down to -198°C

Applications: LNG, LPG, Ammonia

Annex: Q & R for cryogenic tanks

API 660 — Shell & Tube Heat Exchangers

API 660 defines requirements for shell-and-tube heat exchangers used in oil & gas and petrochemical industries.

  • Used with ASME Section VIII Div 1
  • Includes thermal & mechanical design
  • Requires TEMA classification (R, C, B)
  • NDE for shell and nozzle welds

API 661 — Air Cooled Heat Exchangers

API 661 covers fin-fan coolers used for cooling process fluids using ambient air.

  • Fin tube bundles (extruded, welded)
  • Axial flow fans with pitch control
  • Forced vs induced draft systems
  • Noise and vibration control

TEMA Standards

TEMA standards define mechanical design, tolerances, and classifications for shell-and-tube heat exchangers.

Class Application Service
R Petroleum Severe service
C General Moderate service
B Chemical Intermediate
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