Structural Steel Fabrication Inspection and Test Plan (ITP): A Buyer’s Guide

BUYER GUIDE · FABRICATION QUALITY PLANNING

A structural steel inspection and test plan connects each agreed check with its timing, method, acceptance criteria, extent, responsible parties and records. Buyers should review the proposed ITP before the affected work begins, while inspection access and any required attendance can still be planned.

The useful question is not simply “Does the supplier have an ITP?” It is whether this revision tells the people on your project what to check, who must be involved and what permits the next activity to proceed.

What an ITP does—and when to agree it

Read the ITP alongside the contract, project drawings and specifications, applicable standards and confirmed quality plan. The quality plan describes broader quality arrangements; the ITP plans inspection and testing; inspection reports record actual results. An ITP alone does not demonstrate that work has passed.

1. At enquiry or tender: outline the proposed inspection scope and participation so that quotations include the relevant work.
2. Before affected production: confirm the ITP revision, governing documents, responsibilities and intervention points.
3. During fabrication: carry out the agreed checks, issue notifications and link results to the work inspected.
4. At handover: assemble the agreed record package and resolve the release conditions assigned by the contract.

A factory audit assesses processes or capability within its commissioned scope. An ITP sets out project inspection arrangements. The pre-shipment inspection is an order-specific check near dispatch, while NDT examines specified items using an agreed method. None automatically replaces the others.

Inspection, Witness, Hold and Document Review

Define the legend on the project ITP. The letters below are shorthand used in this guide, not a universal coding system.

These are different actions, not four grades of inspection quality. One row may assign inspection to the fabricator, witnessing to an appointed inspector and document review to a buyer representative. Identify each party separately, including any authority to release a hold.

The hold/witness distinction is described by Oracle Aconex; the project’s agreed procedures govern how it operates on a particular order.

How to review a supplier’s proposed ITP

Read the plan as a sequence of decisions, not just a list of inspection subjects. For each row, check that the following information is usable.

• Scope and revision: identify the project, manufacturing location, component groups and covered processes. Include relevant subcontracted work and identify the current ITP revision.
• Criteria: cite the drawing, specification, procedure or standard, with its revision or edition and the applicable acceptance reference. “To standard” does not identify which requirement controls the result.
• Method, extent and timing: define what will be examined and how much. Use the applicable project requirements; do not invent percentages or leave an unresolved “as required.” Schedule fit-up checks before welding and relevant weld checks before coating conceals access.
• People and notices: identify who performs the check, who reviews or witnesses it, who releases a hold, and how each is notified. Include access arrangements and what happens if a witness cannot attend.
• Evidence: name the record or template and its link to member marks, weld identifiers, material batches or other required traceability. Agree document language, recipients and handover format.
• Exceptions: identify the route for nonconformities, repairs, retesting, concessions and revisions. A general “approved” signature must not conceal who accepted which result.

Use the dimensional tolerance guide to frame geometry acceptance questions. The ITP should then point to the actual project limits, measurement references and inspection records.

Discuss Your Fabrication Inspection Scope

What must be settled before the affected work starts?

Confirm production drawing revisions, material requirements and critical interfaces. Have conflicts between drawings, specifications and standards resolved by the authorized technical parties. An inspector should not have to invent an acceptance rule after fabrication.

Agree the applicable welding procedures and qualification requirements. For specified NDT, identify the items, method, coverage, timing, acceptance criteria and personnel requirements. The project-specific UT case illustrates a separate testing assignment; its reported scope is not a default inspection frequency for another order.

Also confirm the coating system and inspection stages, measuring-equipment control, packing requirements and record package. Arrange any required notices and hold releases before they affect production. The paint inspection guide covers coating evidence in more detail.

Not every stage needs a buyer hold point. Select intervention points according to applicable requirements, the consequences of the activity and the agreed allocation of responsibilities.

Example only: a compact fabrication ITP

On a small screen, swipe the table sideways to read all six columns.

A working ITP must define inspection extent and criteria rather than copying these prompts. For example, “dimensions” still needs the features, measurement method, acceptance reference, extent and record. A certificate check must connect the reviewed document to the material identified for the work.

Who checks, confirms and records?

The fabricator performs and records its agreed QC duties. The buyer or appointed inspection organization reviews, witnesses or inspects within its agreed scope. A hold is released by the designated authority. Technical deviations and concessions go to the engineering or contractual parties authorized to decide them.

Third-party attendance does not replace supplier responsibilities. Likewise, an ITP signature is not automatically product certification, engineering approval or shipment release. Record what the signature means and which activity it permits.

Deal with findings and revisions without losing the evidence

Link a failed result or missing evidence to the affected component or activity. Record the issue, responsible person, proposed disposition and approving authority under the agreed nonconformity process. Define any correction, repair, reinspection or retest and the evidence required for closure.

Retain original results alongside follow-up records. Do not bypass an applicable hold while its release conditions remain unmet. If approved requirements change, revise and reissue the ITP, identify the superseded version and notify the people responsible for affected checks.

Frequently asked questions