Before the design, we need to know from you:

I. Basic Operating Conditions and Media Information

Storage Media

• Media Name (e.g., LNG, liquid oxygen, chemical solvents, crude oil, etc.)
• Media Characteristics: Density, viscosity, flash point, corrosivity (presence of sulfur, chloride ions, acids, alkalis), volatility, and whether it is a low-temperature / high-temperature medium.
• Media Temperature Range (maximum / minimum operating temperature) and whether phase change occurs (e.g., boiling, solidification).

Design Pressure and Vacuum Level

• Design Pressure (positive pressure / negative pressure; API 620 allows a maximum of 15 psi; it is necessary to clarify whether overpressure conditions exist).
• Vacuum Level (e.g., negative pressure value when the tank is emptied), with consideration given to structural stability under vacuum conditions.

Media Volume Requirements

• Total Volume and Working Volume (safety margins need to be reserved to avoid overflow due to thermal expansion).
• Filling Coefficient (e.g., maximum filling ratio for liquid media, usually around 0.95, which must comply with API 620 requirements).

II. Tank Structure and Dimension Parameters

Core Dimensions

• Inner / Outer Diameter, total height, and effective height (maximum height for media storage).
• Head Type (e.g., ellipsoidal, dished, conical) and head height (affects the stress and sealing design of the tank top).
• Number of Tanks (for multi-tank system design, the spacing and connection method must be specified).

Structural Form

• Tank Type (vertical cylindrical, conical roof / domed roof, flat bottom / conical bottom).
• Support Type (skirt support, truss support, ground support), which must match the foundation conditions.

III. Environmental and Compliance Requirements

Geographic Environmental Parameters

• Seismic Fortification Intensity of the Location (seismic calculation must be performed in accordance with API 620 Appendix E).
• Maximum Wind Speed, Wind Pressure, and Snow Load (affect tank wall stability and wind-resistant design).
• Soil Type and Groundwater Level (affect foundation design and anti-corrosion requirements).

Compliance and Certification Requirements

• Regulatory Requirements of the Destination Country / Region (e.g., EU REACH, U.S. FDA, anti-corrosion standards for Middle Eastern countries).
• Need for API Certification, Third-Party Testing (e.g., SGS, BV) or local acceptance standards (e.g., ASME BPVC, GB 50128).

IV. Material and Anti-Corrosion Requirements

Main Material Selection

• Materials for Tank Wall, Tank Bottom, and Head (e.g., carbon steel, stainless steel, low-temperature steel, which must match the corrosivity and temperature of the media).
• Material Standards (e.g., ASTM A516/A537 carbon steel, ASTM A240 stainless steel) and key mechanical properties (yield strength, tensile strength, elongation).

Anti-Corrosion and Protection

• Type and Thickness of Anti-Corrosion Coating (primer / topcoat, e.g., epoxy coating, galvanized layer).
• Need for Cathodic Protection System (sacrificial anode / impressed current), with clear requirements for anti-corrosion grade and service life.

V. Operation and Additional Requirements

Inlet / Outlet Methods

• Inlet / Outlet Location (top / bottom) and method (pumping / gravity discharge).
• Need for Mixing, Heating / Cooling Systems (e.g., jacket, coil), with clear requirements for heat exchange area and temperature control.

Accessory Configuration

• Safety Accessories (safety valve, breather valve, level gauge, thermometer, drain outlet).
• Number and Location of Manholes and Nozzles, which must comply with API 620 accessory installation specifications.

VI. Delivery and Schedule Requirements

Design and Delivery Standards

• Requirements for Design Output Documents (drawings, calculation sheets, material lists, compliance certificates).
• Schedule Milestones (design cycle, production cycle, delivery time), which must match the project schedule.

Quality and Acceptance Standards

• Welding Standards (e.g., AWS D1.1) and non-destructive testing requirements (RT/UT/MT/PT ratio).
• Pressure Testing Requirements (hydraulic test pressure, pressure holding time).

VII. Special Working Conditions and Risks

Fire and Explosion Prevention

• Whether the Tank is Near Ignition Sources and fire protection distance requirements.
• Whether the Media is Flammable or Explosive, with clear requirements for explosion-proof grade and protection measures.

Extreme Working Conditions

• For conditions such as low temperature, earthquake, and typhoon, the structural ultimate load-bearing capacity must be considered.

VIII. Commercial and Cost Information

Cost and Budget

• Budget Range (material cost, processing cost, transportation cost).
• Acceptance of Cost Optimization Schemes (e.g., material substitution, structural simplification).

Supplier and Cooperation Requirements

• Supplier Qualifications and localization requirements (e.g., need for local procurement).
• Payment Methods and Delivery Terms (e.g., FOB/CIF trade terms).