An inspection and test plan is a short document with a long reach. It decides which steps of the work are inspected, by whom, against which criteria, and what record proves it was done. Get it right and inspection runs alongside construction with few surprises. Get it wrong and crews wait for inspectors, or work is covered up before anyone checks it. Inspection and test plans for industrial construction are central to quality control on every discipline. This guide covers how they are structured and used, for QA/QC engineers, construction managers and owners’ inspectors.
What is an inspection and test plan?
An inspection and test plan (ITP) is a document that lists, in sequence, the inspections and tests required for a type of work, with the reference documents, acceptance criteria, inspection responsibilities and records for each step.
ITPs are also used in shop fabrication, as described in fabrication quality controls that prevent field delays. The structure is the same on site, but the scope covers every construction discipline.
Why ITPs matter on site
Without an agreed ITP, inspection depends on who happens to be available and what they think should be checked. The ITP removes that uncertainty for crews, inspectors and the client alike.
How an ITP is structured
| Column | What it contains |
|---|---|
| Step or activity | The stage of work, in sequence |
| Reference documents | Specifications, procedures, drawings and codes that apply |
| Acceptance criteria | What must be true for the step to pass |
| Inspection or test method | Visual, dimensional, NDT, pressure test and so on |
| Contractor QC | Inspection involvement of the contractor |
| Client or third party | Inspection involvement of the owner or independent inspector |
| Record | The report, checklist or certificate that proves the step |
Types of inspection point
- Hold point: work cannot continue until the named party has inspected and released it.
- Witness point: the named party is notified and may attend; work can continue if they do not.
- Review point: records are reviewed without physical attendance.
- Surveillance: periodic, unscheduled monitoring of the activity.
Hold points should be reserved for steps that cannot be checked later, such as reinforcement before a pour or a weld root before it is covered.
An illustrative example: field piping
The steps and points below are an illustration; each project sets its own.
| Step | Typical inspection point |
|---|---|
| Material receiving and certificate review | Review |
| Fit-up of critical joints | Witness |
| Visual inspection of completed welds | Contractor inspection |
| NDT to the specified extent | Review of reports |
| Heat treatment, where required | Review of charts |
| Pressure test | Hold |
| Reinstatement before handover | Review |
The welding steps behind this example are described in welding inspection from fit-up to final acceptance.
Building ITPs for a project
- Start from the specifications and codes for each type of work.
- Match inspection intensity to criticality, with more points for critical services and fewer for low-risk work.
- Agree points with the client before the work starts.
- Define notification rules, such as an agreed notice period, often a day or two, before hold and witness points.
- Link each step to a record form, so the ITP produces evidence automatically.
Using ITPs on site
ITPs work through an inspection request system: the contractor raises a request when a step is ready, the inspector attends, and the result is recorded against the ITP step. Linking ITP records to test packs and systems makes them easy to assemble into dossiers, as described in quality documentation for project handover. For equipment, the steps are detailed in quality control checkpoints for mechanical installation.
Common ITP problems
- Generic ITPs copied from another project without adapting references and criteria
- Too many hold points, so crews wait and the hold point loses its meaning
- References missing or outdated
- ITPs approved but not used in the field
- No link between ITP steps and record forms
ITPs are one part of the QA/QC system described in QA/QC services for industrial construction projects. Apex Core Engineering provides QA/QC engineers to prepare and manage ITPs through its project support services.
Frequently asked questions
What is the difference between a hold point and a witness point?
At a hold point, work must stop until the named party inspects. At a witness point, the party is notified and may attend, but work can continue if they do not.
Who prepares the ITP?
Usually the contractor, based on the specifications, with review and approval by the client.
How many hold points should an ITP have?
Only as many as needed for steps that cannot be inspected later or are critical to safety and integrity. Too many hold points slow work without improving quality.
Get support preparing ITPs from Apex Core Engineering.