Unit Converter

Smart Units

SI-first unit conversion + dimensional checks (runs locally in your browser)

Input

Examples:

Convert 670 MPa to kN/mm^2 (5*kN/m^2) * (2.5*m^2) -> kN Convert 32 degF to degC Convert 1 bar to kPa Convert 10 N*m to kN*m

Output

Ready.

v0.2 adds Convert … to … parsing and dimensional autocomplete. Next step to make the database huge: import the UCUM unit definitions and synonyms (see notes in JS).

Hoisting a tank

Tank Lifting Analysis Tool

Calculate reaction forces, validate eave angle, and check wall thickness at hoisting points

Assumption: Center of gravity is assumed to be at the center of the tank.

Load Path and Weight Distribution

Which weights are used for evaluating each component:

Cables: Total weight (Shell + Roof) - Cables lift the entire tank assembly
Lift Lugs: Total weight (Shell + Roof) - Lugs transfer cable loads to eave angle
Lug-to-Eave Angle Bolts: Total weight (Shell + Roof) - These bolts connect lugs to eave angle
Eave Angle: Total weight (Shell + Roof) - Eave angle receives total load from lugs and distributes it
Tank Wall: Shell weight only - Wall only supports the shell; roof weight goes through eave angle to rafters
Wall-to-Eave Angle Bolts: Shell weight only - These bolts connect tank wall to eave angle
Rafter-to-Eave Angle Bolts: Roof weight only - These bolts connect roof rafters to eave angle

Note: Steel sheets between rafters are not considered as structural elements and do not contribute to the load path. Shell weight includes accessories mounted on the wall. Roof weight includes accessories mounted on the roof.

Tank Geometry

Tank Diameter (mm):

Tank Wall Thickness at Top (mm):

Weights

Tank Shell Weight (kg): Includes accessories mounted on the wall

Tank Roof Weight (kg): Includes accessories mounted on the roof

Tank Shell Material Properties

Yield Strength Fy (MPa):

Ultimate Strength Fu (MPa):

Eave Angle Properties

Eave Angle Type (format: leg1/leg2/thickness in mm, e.g., 70/70/7):

Eave Angle Yield Strength Fy (MPa):

Eave Angle Ultimate Strength Fu (MPa):

Roof Geometry (for Radial Force Analysis)

Rafter Angle from Horizontal (degrees): Angle of rafters from horizontal plane

Number of Rafters:

Crown Ring Radius (mm): Radius of crown ring at roof center

Lift Lug Details

Lug Angle Size (format: leg1/leg2/thickness in mm, e.g., 100/100/10):

Number of Bolts Connecting Lug to Eave Angle:

Bolt Connection Details

Wall-to-Eave Angle Bolts (Shell Weight)

Bolt Diameter (mm):

Bolt Grade (e.g., 8.8, 10.9, A325, A490):

Distance Between Bolts (mm): Bolts are provided throughout the circumference

Edge Distance of Bolt (mm):

Thread Condition:

Rafter-to-Eave Angle Bolts (Roof Weight)

Bolt Diameter (mm):

Bolt Grade (e.g., 8.8, 10.9, A325, A490):

Number of Bolts per Connection Point:

Thread Condition:

Lug-to-Eave Angle Bolts (Total Weight)

Bolt Diameter (mm):

Bolt Grade (e.g., 8.8, 10.9, A325, A490):

Thread Condition:

Lifting Configuration

Number of Connection Points:

Lift Angle (degrees from vertical):

Max Allowed Tension per Cable (kN):

Analysis Results

Load Summary

Total Weight:

Vertical Load per Point:

Cable Tension per Point:

Horizontal Component per Point:

Cable Tension Check

Max Allowed Tension:

Actual Tension:

Utilization Ratio:

Status:

Eave Angle Analysis

Note: Eave angle analysis uses total weight (shell + roof) as the roof weight is transferred through the eave angle.

Eave Angle Dimensions:

Applied Load per Point:

Stress in Eave Angle:

Allowable Stress:

Utilization Ratio:

Status:

Eave Angle Radial Force Analysis

Note: Analysis of radial forces acting on eave angle ring. Rafters exert radial outward forces, lifting cables exert radial inward forces.

Total Radial Outward Force (from All Rafters):

Total Radial Inward Force (from All Cables):

Net Radial Force:

Hoop Stress in Eave Angle:

Allowable Hoop Stress:

Hoop Stress Utilization:

Bending Moment per Unit Length:

Bending Stress:

Allowable Bending Stress:

Bending Stress Utilization:

Radial Force Analysis Status:

Tank Wall Thickness Analysis

Note: Wall thickness analysis uses only shell weight (distributed around circumference), as roof weight is transferred through the eave angle, not through the shell wall. Analysis is based on load per bolt at the wall-to-eave angle connection.

Wall Thickness:

Distributed Load per Unit Length:

Applied Load per Bolt (Wall-to-Eave):

Stress at Attachment Point:

Allowable Stress:

Utilization Ratio:

Status:

Lift Lug Analysis

Note: Lift lugs carry the total weight (shell + roof) from cables to eave angle.

Lug Angle Dimensions:

Applied Load per Lug:

Stress in Lug:

Allowable Stress:

Utilization Ratio:

Status:

Lug-to-Eave Angle Bolt Analysis

Note: These bolts connect lift lugs to eave angle and carry total weight (shell + roof).

Bolt Diameter:

Bolt Grade:

Number of Bolts per Lug:

Load per Bolt (Total Weight):

Bolt Shear Capacity:

Shear Utilization Ratio:

Bolt Status:

Wall-to-Eave Angle Bolt Analysis

Note: These bolts connect tank wall to eave angle and carry shell weight only. Bolts are provided throughout the circumference.

Bolt Diameter:

Bolt Grade:

Bolt Spacing:

Edge Distance:

Total Number of Bolts:

Bolts per Connection Point:

Load per Bolt (Shell Weight):

Bolt Shear Capacity:

Shear Utilization Ratio:

Bearing Stress:

Allowable Bearing Stress:

Bearing Utilization Ratio:

Bolt Status:

Rafter-to-Eave Angle Bolt Analysis

Note: These bolts connect roof rafters to eave angle and carry roof weight only.

Bolt Diameter:

Bolt Grade:

Number of Bolts per Point:

Load per Bolt (Roof Weight):

Bolt Shear Capacity:

Shear Utilization Ratio:

Bolt Status:

Recommendations

Element #3