How Do Engineers Prepare Tower Internal Replacement Drawings for Fabrication?
A tower internal replacement project requires more than selecting the correct component.
Before fabrication begins, engineers must convert project requirements into detailed manufacturing drawings.
These drawings provide the information needed for:
- Fabrication accuracy
- Quality inspection
- Installation preparation
- Customer approval
- Site assembly
For revamp projects, replacement drawings are especially important because the new internals must fit into an existing tower.
Why Are Tower Internal Replacement Drawings Important?
Unlike new tower fabrication, revamp projects involve existing equipment limitations.
Engineers must ensure that the replacement internals match:
- Existing tower dimensions
- Available installation space
- Existing support structures
- Manway access limitations
Incorrect drawings may cause:
- Installation difficulties
- Fabrication rework
- Delayed shutdown schedules
- Poor internal performance
What Information Should Be Included in Tower Internal Drawings?
1. Overall Dimensions
Engineers should define:
- Tower inside diameter
- Internal component diameter
- Installation elevation
- Overall height
- Clearance requirements
These dimensions ensure the internal fits correctly inside the vessel.
2. Material Specification
Drawings should clearly indicate:
- Material grade
- Thickness requirements
- Structural materials
- Corrosion-resistant requirements
Examples:
- PP
- SS304
- SS316L
- Special alloys
Material information is essential for:
- Fabrication
- Inspection
- Quality documentation
3. Component Structure Details
Each internal component requires detailed design information.
Examples:
Liquid Distributor
Drawings may include:
- Pipe arrangement
- Nozzle position
- Opening location
- Support method
Packing Support Grid
Drawings may include:
- Grid structure
- Load-bearing design
- Open area
- Connection method
Mist Eliminator
Drawings may include:
- Mesh pad dimensions
- Support frame
- Segment arrangement
- Installation direction
4. Segmentation Details
Large tower internals often require multiple sections.
Replacement drawings should show:
- Number of segments
- Individual segment dimensions
- Connection method
- Assembly marks
This helps ensure:
- Transportation feasibility
- Manway installation
- Correct field assembly
5. Connection and Assembly Details
Drawings should define:
- Bolting points
- Welding requirements
- Fastening method
- Alignment marks
Clear connection details reduce installation uncertainty.
6. Installation Reference Information
For revamp projects, drawings should include:
- Installation elevation
- Orientation marks
- Assembly sequence
- Component identification
This helps site engineers install components correctly.
How Do Engineers Prepare Replacement Drawings Step by Step?
Step 1: Collect Existing Tower Data
Required information includes:
- Tower drawings
- Internal arrangement
- Manway dimensions
- Operating conditions
Step 2: Review Existing Conditions
Engineers evaluate:
- Existing supports
- Available installation space
- Corrosion condition
- Previous modifications
Step 3: Define Replacement Scope
Determine:
- Which components need replacement
- Which components can remain
- Required performance improvement
Step 4: Develop Preliminary Design
Engineers define:
- Dimensions
- Materials
- Segmentation
- Connection method
Step 5: Create Fabrication Drawings
Final drawings normally include:
- General arrangement drawing
- Detailed component drawings
- Material list
- Assembly information
Step 6: Customer Review and Approval
Before production:
Engineers may review:
- Dimensions
- Materials
- Installation requirements
- Technical specifications
Approved drawings become the manufacturing reference.
What Drawings Are Commonly Required for Tower Internals?
General Arrangement Drawing
Shows:
- Overall internal position
- Installation elevation
- Relationship between components
Fabrication Detail Drawing
Shows:
- Manufacturing dimensions
- Material details
- Connection structure
Assembly Drawing
Shows:
- Segment arrangement
- Installation sequence
- Field assembly method
Material List
Includes:
- Component name
- Material grade
- Quantity
- Specification
Common Mistakes When Preparing Tower Internal Drawings
Using Only Standard Product Dimensions
Revamp projects usually require customized dimensions.
Ignoring Manway Limitations
A technically correct design may not be installable.
Missing Installation Details
Without clear assembly information:
- Site installation may be delayed.
- Incorrect positioning may occur.
Changing Design Without Updating Drawings
All fabrication changes should be reflected in approved documents.
What Information Should Customers Provide Before Drawing Preparation?
Engineers should provide:
Equipment Information
- Tower diameter
- Tower drawings
- Existing internal layout
- Manway dimensions
Process Information
- Gas flow
- Liquid flow
- Temperature
- Pressure
- Chemical composition
Project Requirements
- Replacement scope
- Material requirements
- Installation schedule
- Inspection requirements
How DAIER Supports Tower Internal Engineering Drawings
DAIER provides engineering support for:
- Random Packing Replacement
- Structured Packing Upgrade
- Liquid Distributor Design
- Redistributor Design
- Packing Support Grid
- Hold-down Grid
- Mist Eliminator
- Customized Tower Internals
For revamp projects, DAIER can support:
- Engineering review
- Customized drawings
- Segmented fabrication design
- Manufacturing documentation
DAIER supports tower internal solutions from engineering design through fabrication.
Specs and test data available upon request.