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API 650 / API 620 Storage Tank Design

Specialized engineering support for aboveground welded storage tanks, including atmospheric API 650 tanks and low-pressure API 620 tanks. The service covers early sizing, detailed calculations, drawing review, fabrication support, repair studies, and independent verification for terminals, refineries, petrochemical plants, and tank farms.

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API 650 / API 620 Storage Tank Design main equipment photo
API 650 / API 620 Storage Tank Design supporting photo 2
API 650 / API 620 Storage Tank Design supporting photo 3

Detailed Scope

  • Tank diameter, height, shell course, roof, bottom, annular plate, and wind girder design checks.
  • Anchorage, overturning, seismic, wind, external pressure, vacuum, and hydrotest load case review.
  • Nozzle reinforcement, manway, platform, stair, ladder, and appurtenance coordination.
  • Foundation interface review, settlement considerations, bottom slope, sump, and drain coordination.
  • API 650 / API 620 calculation package preparation or independent third-party verification.

Overview

  • Specialized engineering support for aboveground welded storage tanks, including atmospheric API 650 tanks and low-pressure API 620 tanks. The service covers early sizing, detailed calculations, drawing review, fabrication support, repair studies, and independent verification for terminals, refineries, petrochemical plants, and tank farms.

Typical Input Documents

  • Tank datasheet
  • Design code and client specifications
  • Site wind/seismic data
  • Product properties
  • GA drawings

Typical Deliverables

  • Tank design calculation report
  • GA and nozzle orientation review notes
  • Shell course and material summary
  • Technical query and deviation register
  • Fabrication and erection review comments

Software Used

  • AMETank
  • Hexagon Tank
  • AutoCAD
  • Inventor

Typical Timeline

  1. 1Initial review: 1 working day
  2. 2Engineering or checking cycle: 2-5 working days
  3. 3Final closeout after comments: 1-2 working days

Who Should Request This Service

  • EPC contractors needing specialist support during proposal, detailed engineering, or closeout.
  • Fabricators needing checked calculations, drawings, MTOs, or vendor response support.
  • Operators and industrial clients needing independent technical review before approval or fabrication.

Workflow

  1. 1Scope and data review
  2. 2Load case definition
  3. 3Code calculations
  4. 4Drawing coordination
  5. 5Final review package

Common Applications

  • Crude storage
  • Water tanks
  • Diesel tanks
  • Low pressure storage
  • Tank repair and alteration