How EPC Buyers Compare Tower Internals Technical Bids: An RFQ Decision Matrix
Technical Guide | EPC Procurement & Engineering Evaluation | KEMVORI Petrochemical Equipment Limited
Direct Engineering Answer: How Should EPC Buyers Compare Tower Internals Suppliers?
EPC buyers should compare tower internals quotations against one consistent technical and commercial basis.
The lowest quotation is not necessarily the most economical option.
Different suppliers may quote different:
Hydraulic design scopes.
Materials.
Equipment configurations.
Manufacturing requirements.
Inspection levels.
Documentation.
Installation responsibilities.
Delivery conditions.
A quotation that excludes hydraulic calculations or important internal components may appear cheaper while creating additional engineering and project costs.
A structured bid comparison helps identify these differences before purchase order award.
1. Establish One Governing RFQ Revision
Before evaluating suppliers, ensure all bidders have received the same technical documents.
Confirm:
RFQ revision.
Process datasheet.
Column GA.
Internals drawings.
Material specification.
Applicable codes.
Inspection requirements.
Delivery requirements.
If different suppliers quote against different revisions, their prices and technical offers may not be directly comparable.
All deviations should be recorded.
2. Compare Hydraulic Design Scope
Hydraulic performance is one of the most important technical evaluation areas.
Check whether the supplier has included:
Vapor-liquid loading evaluation.
Flooding assessment.
Pressure-drop calculations.
Tray or packing selection.
Liquid distribution review.
Distributor sizing.
Operating range evaluation.
Ask for the calculation basis.
A technical offer should identify:
Operating cases.
Process properties.
Equipment geometry.
Calculation boundaries.
Key assumptions.
Expected deliverables.
KEMVORI supports project-based hydraulic calculations and tower internals design evaluations according to the agreed scope and available process data.
3. Compare Material Compliance
Check the offered materials against the RFQ.
Relevant information may include:
Stainless steel grade.
Polymer grade.
Ceramic specification.
Material thickness.
Material certificates.
Traceability requirements.
Welding or joining requirements.
Approved substitutions.
A supplier should identify any material deviations instead of silently replacing specified materials.
4. Compare Mechanical Configuration
The same product name does not guarantee the same design.
Review:
Equipment dimensions.
Component arrangement.
Support structure.
Connection details.
Segment design.
Installation access.
Assembly requirements.
Interface drawings.
For complex internals, drawings should make it possible to understand the proposed configuration.
5. Compare Quality and Inspection Deliverables
A technical quotation should identify the agreed quality requirements.
Compare:
Inspection and test plan.
Material certificates.
Dimensional inspection.
Welding documentation.
Required testing.
Inspection records.
Final documentation package.
Third-party inspection where specified.
Do not assume every supplier includes the same inspection scope.
6. Compare Commercial Scope and Exclusions
Review whether each quotation includes:
Engineering calculations.
Detailed drawings.
Fabrication.
Accessories and fasteners.
Assembly.
Inspection.
Packaging.
Shipping.
Installation supervision.
Required documentation.
Record all exclusions.
A lower purchase price may reflect omitted work rather than better manufacturing efficiency.
7. Build a Practical Technical Bid Comparison Matrix
Use a consistent evaluation structure.
Evaluation area
What to compare
Process basis
Same operating cases
Hydraulic design
Calculation scope and results
Material
Grade and specification
Mechanical design
Dimensions and configuration
Manufacturing
Scope and process
Inspection
ITP and required records
Documentation
Drawings and certificates
Delivery
Schedule and shipment
Exclusions
Missing work and deviations
Commercial
Comparable total price
The evaluation team should identify mandatory requirements separately from optional advantages.
A non-compliant offer should not receive a high technical score simply because its commercial price is attractive.
8. Common EPC Bid Evaluation Mistakes
Mistake 1: Selecting the lowest price immediately.
Solution: Normalize the technical scope first.
Mistake 2: Comparing pressure-drop values under different conditions.
Solution: Require a common hydraulic basis.
Mistake 3: Ignoring material deviations.
Solution: Check each offered grade against the specification.
Mistake 4: Overlooking missing drawings.
Solution: Identify the required engineering deliverables before award.
Mistake 5: Ignoring exclusions.
Solution: Build a complete scope comparison.
Mistake 6: Evaluating delivery without considering technical approval time.
Solution: Include drawing review, manufacturing and inspection milestones in the schedule.
9. EPC Technical Bid Evaluation RFQ Checklist
Before purchase order award, confirm:
All bidders used the same RFQ revision.
Process cases are consistent.
Hydraulic scope is defined.
Materials are compliant.
Mechanical interfaces are addressed.
Inspection requirements are included.
Documentation is listed.
Deviations are recorded.
Exclusions are understood.
Delivery schedules are comparable.
Commercial offers are normalized.
Frequently Asked Questions
Is the lowest tower internals bid always the best?
No. Technical compliance and total project scope must be evaluated before comparing final prices.
What should a hydraulic calculation proposal include?
It should define the process cases, equipment geometry, calculation scope, assumptions and agreed deliverables.
Why should EPC buyers request deviations lists?
They reveal differences between the requested specification and the supplier's actual offer.
Should engineering drawings be reviewed before award?
For critical or customized equipment, drawing review and approval responsibilities should be clearly established in the procurement schedule.
Can KEMVORI provide technical bid clarification?
KEMVORI can provide project-specific technical clarifications, hydraulic calculation scope, material information and equipment drawings according to the agreed inquiry requirements.
Engineering Support from KEMVORI
KEMVORI Petrochemical Equipment Limited provides engineering review and customized tower internals solutions for distillation, absorption, refining and petrochemical projects.
Our support can include:
Technical specification review.
Hydraulic calculations.
Tower internals selection.
Pressure-drop evaluation.
Flooding assessment.
Engineering drawings.
Customized manufacturing.
Inspection and documentation coordination.
Send your RFQ and technical bid requirements for a project-specific engineering review.
Engineering Design & Hydraulic Calculations
Related Guide: Complete Process Column RFQ
Related Guide: How EPC Buyers Can Compare Tower Internals Engineering Proposals
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