What is an ITP (Inspection and Test Plan)?
An ITP is the controlled document that lists every inspection and test for a scope of work, in sequence, with the acceptance criteria, the reference clause, the responsible party and the record produced at each step.
ITP stands for Inspection and Test Plan. On a capital project it is the agreement between the party doing the work, the party paying for it and the inspector verifying it — written before fabrication starts, not reconstructed afterwards.
This page defines the ITP, walks through a worked pipe-spool example, and gives the column-by-column template that a reviewable ITP needs. If you already know what an ITP is and want to write one, read the seven-step preparation guide linked at the end.
- 01An ITP lists inspection and test activities in build sequence, not by discipline.
- 02Every line carries an acceptance criterion, a clause reference and a named record.
- 03Hold (H) stops work; witness (W) invites attendance; review (R) is a records check.
- 04The party performing the work writes the ITP; the owner reviews, adds points and approves it.
ITP meaning in one paragraph
An Inspection and Test Plan (ITP) is a controlled quality document that sets out, activity by activity and in the order the work happens, what will be inspected or tested, against which code or specification, to what acceptance criteria, by whom, what objective evidence is produced, and at which points work must stop for verification. It is sometimes called a quality control plan or QCP; on regulated projects the ITP is the document an auditor opens first, because it is where the promised verification and the delivered verification can be compared line by line.
What an ITP contains — column by column
Formats vary by owner and by sector, but a reviewable ITP carries these columns. Anything missing here is a gap someone will argue about later.
| Column | What goes in it | Common failure |
|---|---|---|
| Item / line no. | Sequential reference for every discrete activity. | One line covering a whole phase such as 'welding'. |
| Activity | The physical operation: material receiving, fit-up, root pass, NDE, PWHT, hydrotest, coating, packing. | Activities listed by discipline instead of build sequence. |
| Reference document | Exact code, edition, clause or table plus the governing project specification section. | Citing 'ASME B31.3' with no clause or edition. |
| Acceptance criteria | The measurable pass/fail condition, including tolerance and units. | 'To spec' or 'satisfactory'. |
| Verifying document | The procedure or method statement the activity is performed to. | Procedure not yet issued when the ITP is approved. |
| Intervention point | H (hold), W (witness), R (review) or M (monitor), assigned per party. | Every line marked hold, which stalls the shop. |
| Responsibility | Named party for each column: contractor, vendor, third-party inspector, owner. | Roles left as 'QC' with no organisation named. |
| Record / evidence | The certificate, report or checklist the line produces for the data book. | An activity with no record, so nothing is auditable. |
| Sign-off | Signature and date columns for each attending party. | Sign-offs collected retrospectively at close-out. |
An ITP extract for a carbon-steel pipe spool
Six lines from a shop fabrication ITP, showing how sequence, clause reference and intervention points fit together.
| No. | Activity | Reference | Acceptance criteria | Point | Record |
|---|---|---|---|---|---|
| 01 | Material receiving | EN 10204 · project spec §3.2 | Mill certificate type 3.1 matches heat numbers on the pipe; no transit damage. | R | Material receiving report |
| 02 | Fit-up and alignment | ASME B31.3 §328.4 | Root gap and internal misalignment within specified tolerance. | W | Fit-up checklist |
| 03 | Welding | ASME Section IX · approved WPS | Welder qualified for the WPS; parameters within the qualified range. | M | Weld log, welder qualification |
| 04 | Radiographic examination | ASME B31.3 §344.5 · Table 341.3.2 | No cracks, incomplete fusion or indications beyond the table limits. | H | RT report and film review |
| 05 | Hydrostatic test | ASME B31.3 §345.4 | 1.5 × design pressure held 10 minutes with no pressure loss or leakage. | H | Signed hydrotest pack |
| 06 | Coating and final release | SSPC-SP 10 · project coating spec | Surface prep grade achieved; DFT within specified range before release. | W | Coating report, release note |
Notice what makes these lines usable: each one is a single physical operation, the clause is specific enough to look up, the acceptance criterion is measurable, and the record named in the last column is the exact document that will land in the data book. An inspector who has never seen the job can pick this up and verify it.
Hold, witness, review and monitor — the difference
Hold point (H)
Work cannot proceed past this activity until the nominated party attends and signs. Reserve holds for irreversible or safety-critical steps.
Witness point (W)
The party is notified in advance and may attend; if they do not attend within the notice window, work proceeds and is recorded.
Review point (R)
A documentation check after the fact — certificates, reports and calibration records reviewed against the acceptance criteria.
Monitor / surveillance (M)
Unannounced or periodic observation of an ongoing activity, typically welding or coating, without stopping the work.
Misassigning these is the most common ITP defect we find. Marking everything a hold point buries the schedule in waiting time; marking critical NDE as a review point lets a defect ship. The notice period for witness points — typically 24 to 72 hours — belongs in the ITP itself, not in an email thread.
Who writes, approves and holds the ITP
- The party performing the work — fabricator, vendor or contractor — prepares the ITP, because they own the process and its sequence.
- The owner or owner's engineer reviews it, adds their own hold and witness points, and issues it Code 1 / Approved before work starts.
- A third-party inspection agency verifies the marked points independently and signs the ITP at attendance.
- On EPC projects the EPC contractor consolidates vendor ITPs into a package-level master ITP that indexes, but does not replace, each vendor's plan.
Questions we get on this topic
What does ITP stand for?
ITP stands for Inspection and Test Plan. Some owners and sectors call the same document a quality control plan (QCP) or inspection and test programme; the content and purpose are the same.
What is an ITP in construction?
In construction an ITP is the approved document that lists each inspection and test for a work package — earthworks, concrete pours, structural steel, piping, electrical — in the order it is built, with the acceptance criteria, the standard, the responsible party, the record and the hold or witness points. It is issued and approved before site work starts and signed progressively as the work proceeds.
What is the difference between an ITP and a method statement?
A method statement describes how an activity will be performed — the sequence, equipment, personnel and controls. An ITP describes how the result will be verified: what is inspected, against which criteria, by whom, and what evidence is produced. The ITP normally references the method statement in its verifying-document column.
Is an ITP a contractual document?
Usually yes. On most capital projects the approved ITP is a contract deliverable: it is issued for owner approval before fabrication or construction begins, and the signed copy plus its attached records form part of the turnover data book at handover.
How do I write an ITP?
Map the build sequence first, then write one line per discrete activity with its clause reference, measurable acceptance criteria, intervention point, responsible party and record. Our seven-step preparation guide covers the full method, including how to route the plan for owner approval before fabrication starts.
Need an ITP prepared or reviewed?
Our inspectors and quality engineers write, review and approve ITPs for owners, EPCs and vendors across North America — and verify the hold points in the shop.