How to Build a Technical Bid Evaluation Matrix for Tower Packing Suppliers

Tower packing quotations can look easy to compare.

Supplier A offers:

USD 2,800.

Supplier B offers:

USD 3,200.

Supplier C offers:

USD 2,450.

But the lowest quotation may not represent the same product or supply scope.

Different suppliers may quote different:

• materials;
• wall thicknesses;
• packing geometry;
• documentation;
• inspection requirements;
• packaging;
• tower internals;
• spare quantities.

A Technical Bid Evaluation, or TBE, is used to normalize those differences before commercial selection.

1. Technical Evaluation Comes Before Price Ranking

The objective of a TBE is not to decide which supplier is cheapest.

It is to determine:

Are these quotations technically equivalent enough to compare commercially?

Only after the technical basis is aligned should price become the main comparison.

Otherwise, a buyer may select a lower price that actually excludes important requirements.

2. Start With One Common Technical Basis

The TBE should be built from the same RFQ or approved specification sent to all bidders.

For example:

Product: Metal Pall RingSize: 50 mmMaterial: SS316LRequired Volume: 20 m³Required Documentation: Material CertificatePacking: Export Suitable

This becomes the baseline.

Each bidder is then checked against it.

3. Compare Product Identity First

Confirm whether every supplier has quoted the same packing family.

For random packing:

• Pall Ring;
• Raschig Ring;
• Intalox-type packing;
• other geometry.

For structured packing:

• packing model;
• specific surface-area class;
• corrugation geometry.

A technically different packing should not be treated as equivalent simply because its nominal size is similar.

4. Compare Material Grade

Do not group all quotations under:

Stainless steel.

Separate:

• SS304;
• SS316L;
• other alloys.

Likewise, plastic offers should distinguish:

• PP;
• PVDF;
• PTFE;
• other polymers.

A material substitution can create a large price difference.

That difference is not automatically a supplier pricing advantage.

5. Compare Wall or Sheet Thickness

For metal packing, thickness can influence:

• weight;
• rigidity;
• raw-material consumption;
• cost.

Two suppliers can quote the same nominal packing size while using different thicknesses.

The TBE should therefore record actual offered thickness where it is part of the project specification.

6. Compare Structured Packing Geometry Properly

For structured packing, do not compare only:

Supplier A: 250YSupplier B: 250Y

Review relevant parameters such as:

• specific surface area;
• corrugation angle;
• element height;
• sheet thickness;
• surface treatment;
• void fraction;
• packing weight;
• segment arrangement.

Model names are not universal guarantees of identical construction.

7. Separate Confirmed Data From Assumptions

A supplier may write:

Standard specification.

That should not automatically be entered as “Comply.”

Mark it as:

Clarification Required

until the actual parameter is known.

Useful TBE status categories include:

• Comply;
• Deviate;
• Clarification Required;
• Not Applicable.

This makes uncertainty visible.

8. Compare Quantity Basis

Supplier A may quote:

20 m³.

Supplier B may quote:

5,000 kg.

Supplier C may quote:

20 bags.

These are not directly comparable until the quantity basis is reconciled.

For random packing, determine:

• packed volume;
• bulk density;
• resulting net weight;
• package quantity.

Commercial comparison should use the same supply quantity.

9. Check What Is Included in the Scope

A quote for “tower packing” may or may not include:

• support grid;
• hold-down grid;
• distributor;
• fasteners;
• spare packing;
• installation;
• freight packaging.

The TBE should show these items explicitly.

Otherwise, a cheaper offer may simply contain less scope.

10. Compare Documentation Requirements

One supplier may include:

• material certificate;
• inspection report;
• PMI;
• drawing;
• final dossier.

Another may include only a commercial invoice and packing list.

If the project requires formal QA documentation, the additional scope has value and cost.

Record it in the TBE rather than discovering the difference after PO placement.

11. Compare Inspection Scope

Check whether offers include:

• dimensional inspection;
• COA;
• PMI;
• third-party inspection;
• witness points;
• special testing.

Third-party inspection cost may be:

• included;
• excluded;
• payable by buyer.

The comparison should make this visible.

12. Compare Packaging

Packaging can significantly affect export projects.

Check:

• bulk bag;
• carton;
• pallet;
• wooden case;
• seaworthy packing;
• moisture protection.

Ceramic packing, structured packing, and tower internals may require different packaging.

13. Record Technical Deviations Individually

Do not summarize:

Supplier B has minor deviations.

List them.

For example:

• thickness 0.4 mm vs required 0.5 mm;
• no PMI included;
• layer height differs from drawing;
• support grid excluded.

Each deviation can then be technically assessed.

14. Do Not Create a Score That Hides Critical Failures

A numerical scoring system can be useful, but it can also mislead.

A supplier should not become “technically acceptable” merely because it scores well overall while failing a critical material requirement.

Separate:

Mandatory Requirements

from

Preference Items.

A mandatory material or geometry requirement should be resolved explicitly.

15. Close Clarifications Before Final Commercial Comparison

The TBE process normally creates questions.

Examples:

• confirm sheet thickness;
• confirm exact material;
• confirm quantity basis;
• confirm documentation;
• confirm lead time after drawing approval.

Send these clarification questions to the supplier and update the matrix using the response.

The final TBE should reflect the latest confirmed offer—not the first quotation alone.

16. Preserve the Final Bid Basis

Once a supplier is selected, the final TBE can help define what the purchase order must include.

Important accepted parameters should be transferred into:

• PO;
• approved datasheet;
• supplier drawing;
• technical attachment.

This prevents the technical basis from being lost after award.

Example TBE Categories

A practical TBE may contain:

Product

• packing type;
• model;
• size.

Material

• grade;
• thickness.

Technical Data

• surface area;
• void fraction;
• bulk density;
• packing factor where relevant.

Project Fit

• tower diameter;
• segmentation;
• manway suitability.

Scope

• packing;
• internals;
• spare;
• fasteners.

QA

• certificates;
• inspection;
• PMI;
• ITP.

Delivery

• packaging;
• lead time;
• Incoterm.

Status

• comply;
• deviation;
• clarification.

Engineering Takeaway

A Technical Bid Evaluation does not ask:

Which quotation has the lowest number?

It asks:

What exactly is each supplier offering, and are those offers technically equivalent?

The correct sequence is:

RFQ Baseline→ Supplier Offers→ Technical Normalization→ Clarifications→ Deviations Resolved→ Technically Comparable Offers→ Commercial Evaluation

This prevents price differences from hiding scope or specification differences.