How to Build a Vendor Document Requirement List for Tower Packing and Internals

Industrial projects often fail in one of two documentation extremes.

The first is asking the supplier for almost nothing.

The second is requesting dozens of documents that provide little value.

A Vendor Document Requirement List, or VDRL, helps define exactly what information the supplier must submit, when it is required, and why.

Start with the Product

Documentation requirements should match the supplied product.

A standard PP Pall Ring order does not need the same document package as:

a custom SS316L liquid distributor.

Product complexity should drive document complexity.

Typical Technical Documents

Depending on scope, the project may require:

• technical datasheet;
• GA drawing;
• fabrication drawing;
• calculation;
• material certificate;
• ITP;
• inspection procedure;
• installation instruction.

The list should be project-specific.

Define Submission Timing

Each document should have a required stage.

Examples include:

With quotationTechnical datasheet and deviations.

After POGA drawing and document schedule.

Before manufactureApproved fabrication drawing and ITP.

Before shipmentInspection records and packing list.

FinalMDR.

This prevents the supplier from delivering critical approval documents only after manufacturing is complete.

Define Review Status

Some documents are:

for approval.

Others are:

for review or for information.

The distinction matters.

The supplier should know whether production must wait for purchaser approval.

Define Format

The project may require:

• PDF;
• editable spreadsheet;
• CAD;
• native calculation file.

Not every document needs an editable source.

But format requirements should be agreed early.

Assign Document Numbers

For large projects, supplier documents should use a controlled numbering system.

This improves:

• revision tracking;
• search;
• approval status;
• future archive.

Avoid Duplicate Requirements

A VDRL may accidentally request the same information through several documents.

For example:

material grade may appear in datasheet, BOM, MTC, and inspection report.

That is acceptable when each document serves a different purpose.

But unnecessary duplication should be avoided.

Define Final Documentation

Some documents are required during design but do not need to appear in the final MDR.

Others form part of the permanent equipment record.

The VDRL can identify which documents require final as-built submission.

Link to Schedule

Late document approval can delay manufacturing.

Therefore, document milestones should be connected to:

engineering and production schedule.

Supplier lead time should include purchaser review time where relevant.

Small Orders Need Simpler Lists

For a standard packing shipment, a practical VDRL might require only:

• product datasheet;
• COA or conformity certificate;
• packing list.

Creating a full EPC-style document register for every order creates cost without equivalent benefit.

Engineering Takeaway

A VDRL defines the information deliverables that support engineering, manufacturing, inspection, shipment, installation, and future maintenance.

The list should be complete enough to control the project but proportional to the equipment risk.