How Do Engineers Verify Tower Internal Mechanical Strength Before Installation?
Tower internals must not only meet process requirements but also withstand mechanical loads during operation.
Before installation, engineers need to verify that internal components can safely support:
- Packing weight
- Liquid holdup
- Operating loads
- Installation loads
- Long-term mechanical stress
Insufficient mechanical strength may result in:
- Structural deformation
- Internal damage
- Packing movement
- Reduced tower performance
- Unexpected maintenance
Therefore, mechanical verification is an important step in tower internal design and revamp projects.
Why Is Mechanical Strength Verification Important for Tower Internals?
Tower internals operate under combined mechanical and process conditions.
For example:
A packing support grid must support:
- Dry packing weight
- Liquid retained inside packing
- Dynamic operating loads
A distributor support structure must maintain:
- Correct position
- Stable operation
- Uniform liquid distribution
If deformation occurs, it may affect the entire tower performance.
What Loads Do Engineers Consider for Tower Internals?
1. Packing Weight Load
The support system must carry the weight of:
- Random packing
- Structured packing
- Ceramic packing
- Metal packing
Different packing materials have different densities.
Examples:
- Ceramic packing usually creates higher dead load.
- Plastic packing creates lower structural load.
2. Liquid Holdup Load
During operation, packing contains retained liquid.
Engineers consider:
- Liquid density
- Operating liquid volume
- Expected holdup
The actual operating load can be significantly higher than the dry packing weight.
3. Internal Component Weight
The structure must also support:
- Distributor components
- Redistributor components
- Mist eliminator frames
- Support structures
4. Installation Loads
During installation, temporary loads may occur.
Examples:
- Worker access
- Installation tools
- Temporary supports
- Component handling forces
Engineers should consider these conditions before installation.
Which Tower Internals Require Mechanical Strength Evaluation?
1. Packing Support Grid
The support grid is one of the most important load-bearing components.
Engineers evaluate:
- Load capacity
- Deflection
- Structural stability
- Open area
A support grid failure may cause:
- Packing collapse
- Flow restriction
- Tower shutdown
2. Hold-down Grid
The hold-down grid prevents packing movement.
Engineers evaluate:
- Compression force
- Structural integrity
- Fixing method
Important for:
- High gas velocity applications
- Lightweight packing
- Transport or vibration conditions
3. Liquid Distributor Support Structure
The distributor must remain level during operation.
Mechanical problems may cause:
- Uneven liquid distribution
- Reduced efficiency
- Local dry areas
4. Mist Eliminator Support Frame
Large mist eliminators require reliable support.
Engineers consider:
- Weight
- Span length
- Installation arrangement
- Operating vibration
How Do Engineers Verify Mechanical Strength?
Step 1: Collect Design Information
Required data includes:
- Tower diameter
- Internal dimensions
- Component materials
- Packing type
- Operating conditions
Step 2: Calculate Applied Loads
Engineers evaluate:
- Dead weight
- Operating load
- Safety margin
- Support reactions
Step 3: Review Structural Design
Important considerations:
- Material strength
- Thickness
- Connection design
- Support arrangement
Step 4: Confirm Installation Conditions
Engineers check:
- Segment weight
- Handling method
- Installation sequence
- Site limitations
What Materials Affect Mechanical Strength?
Common materials include:
Stainless Steel
Advantages:
- High mechanical strength
- Good temperature resistance
- Suitable for heavy-duty applications
Common grades:
- SS304
- SS316L
Plastic Materials
Examples:
- PP
- PVC
Advantages:
- Chemical resistance
- Lightweight
Considerations:
- Temperature limitation
- Structural design requirements
Special Materials
For aggressive environments:
- Special alloys
- Reinforced materials
may be considered.
Common Mistakes When Evaluating Tower Internal Strength
Checking Only Material Strength
A strong material does not guarantee a good design.
Engineers must also consider:
- Structure
- Geometry
- Connections
- Loading conditions
Ignoring Operating Liquid Load
Dry weight alone may underestimate actual operating conditions.
Using Existing Supports Without Verification
Old structures may have:
- Corrosion
- Reduced thickness
- Fatigue damage
Ignoring Installation Loads
A component may be suitable for operation but difficult to install safely.
What Information Is Needed for Mechanical Verification?
Engineers should provide:
Equipment Information
- Tower diameter
- Internal arrangement
- Support locations
- Existing drawings
Process Information
- Packing type
- Packing density
- Liquid properties
- Operating conditions
Project Requirements
- New capacity
- Material requirements
- Installation conditions
How DAIER Supports Tower Internal Mechanical Design
DAIER provides customized tower internals including:
- Packing Support Grid
- Hold-down Grid
- Liquid Distributor
- Redistributor
- Mist Eliminator
- Random Packing
- Structured Packing
For tower revamp and new projects, DAIER evaluates:
- Mechanical requirements
- Operating conditions
- Material selection
- Installation limitations
DAIER supports tower internal solutions from engineering design through fabrication.
Specs and test data available upon request.