Valve Inspection and Test Plans: What Each Hold Point Means

Why an ITP Exists in the First Place

Most disputes between a valve buyer and a manufacturer trace back to the same root cause: nobody agreed in writing on when quality activities would happen and who had to be there when they did. An Inspection and Test Plan, or ITP, exists to remove that ambiguity before the first casting is poured.

An ITP is not a test procedure. It is a schedule of quality activities mapped against the manufacturing sequence, stating for each one: which standard governs it, what evidence will be produced, and what level of buyer involvement is required. Written well, it functions like a shared map. The manufacturer knows what to plan for, the inspector knows when to show up, and the buyer knows what documentation will land in the dossier at the end.

The Typical Sequence of Inspection Nodes

For a cast or forged industrial valve, the ITP usually follows the material through the shop. The nodes below reflect common practice on API 600, API 6D, and ASME B16.34 work, though the exact order shifts from one valve type to another:

• Raw material receipt — verification of mill certificates against EN 10204 (typically 3.1, sometimes 3.2) and heat number traceability.
• Casting stage — chemical composition confirmation from the heat analysis, plus visual and dimensional checks before machining.
• Heat treatment — confirmation that the correct cycle (normalizing, tempering, solution annealing, or PWHT as applicable) was performed, with recorded charts reviewed.
• Non-destructive testing — radiography, penetrant, magnetic particle, or ultrasonic examination per the code level called out.
• Dimensional inspection — face-to-face per ASME B16.10, end dimensions per ASME B16.5 or B16.25, and critical internal geometry.
• Hydrostatic shell and seat testing — per API 598, API 6D, or ISO 5208, depending on valve type and specification.
• Pneumatic or low-pressure air seat test — where the specification calls for it.
• Painting and coating — surface profile, dry film thickness, adhesion, and holiday testing where a coating specification exists.
• Final documentation review and packing — dossier completeness, nameplate verification, and preservation for transport.

Each of these nodes can be assigned a different level of buyer involvement, and that is where the letter codes come in.

Witness Points versus Hold Points

The distinction between a witness point (W) and a hold point (H) is contractual, and getting it wrong causes real problems.

A witness point means the manufacturer notifies the buyer, and the buyer may attend. If the buyer or their inspector does not show up on the notified date, the manufacturer proceeds. Work is not blocked; the buyer simply forfeits the opportunity to witness. Witness points suit activities where the manufacturer's own records are considered reliable evidence but the buyer wants the option of observation.

A hold point means the manufacturer notifies the buyer and must wait for attendance or a written release before proceeding. If the inspector does not arrive and has not waived attendance, the line stops. Hold points are reserved for activities that cannot reasonably be re-performed later — a hydrostatic test on a painted, insulated valve, for example, or radiography of a weld that will be buried under machining. Once the valve moves past a hold point without release, the only remedy may be rework at someone's expense.

The practical advice: assign hold points sparingly. A default hold point on every activity turns a purchase order into a scheduling nightmare and inflates the price, because the manufacturer must build idle time into every job.

Review Points and the Documentation Dossier

A third code, R (review), covers activities verified by documents rather than attendance. Weld procedure qualifications (WPS/PQR), NDT procedures and operator qualifications, material certificates, heat treatment charts, and the final test report are typically R items. The reviewer checks them against the specification — either during production or at the final documentation review.

A well-run review catches problems that witnessing never would. A temperature chart that shows the solution anneal ran 40 °C below the specified range tells you more than standing next to the furnace ever would. For this reason, many experienced buyers weight their ITPs heavily toward R points with a small number of critical H points.

How Third-Party Inspection Fits In

On many projects, the buyer appoints a third-party inspection agency (TPI) rather than attending in person. The ITP should name the agency, state that the agency's attendance satisfies the buyer's obligations, and confirm that the manufacturer grants site access, safety induction, and reasonable working space.

Two details matter. First, TPI attendance must be managed under the same notification rules as the buyer's own inspectors — the manufacturer should not be chasing three different organizations for one signature. Second, the TPI's scope should be defined: witnessing designated points, reviewing records, and issuing a release note, not re-performing the manufacturer's own quality control. Final release is often formalized through a Certificate of Conformance supported by the inspection release.

Notification Obligations and the Risk of Waiting

Notification clauses are where theory meets scheduling reality. A typical clause reads: the manufacturer shall notify the buyer at least seven working days before a hold point, and again three days before confirmation. If the buyer's inspector does not arrive by the notified date, and has not requested a deferral in writing, the manufacturer may proceed — or, for hold points, may be entitled to stand the resulting delay.

Buyers who skip the notification review sometimes discover, after delivery, that a hold point was passed without them. The remedy depends entirely on what the contract says. If the ITP gives the manufacturer the right to proceed after notification, the passed point is usually defensible, provided the notification record exists. If the contract is silent, the dispute can drag on. Written notice — email with date stamps, not phone calls — is what protects both sides.

Writing the ITP into the Purchase Contract

An ITP only has teeth if the purchase documents make it binding. The purchase order or technical annex should state:

• The ITP is a contractual document; deviations require written approval before execution.
• The notification period in working days, and who receives the notice (a named role, not "the buyer" generally).
• The consequences of missed attendance at witness points and hold points, in both directions.
• Which documents constitute acceptance: the test report, the inspection release note, and the final dossier per the agreed contents list.
• Whether re-inspection costs fall to the buyer or the manufacturer when results fail.

When a manufacturer that produces the full valve range in-house works on engineered projects, it is usually preferable to agree the ITP at the quotation stage rather than after the order. Reviewing the manufacturer's ball valve range and standard test scopes against API 6D and API 598 before an ITP is drafted around them avoids surprises later.

Common Disputes and How They Get Resolved

A few recurring patterns cover most ITP arguments:

• The missed hold point. The inspector did not come, the valve moved on, and the buyer demands re-test. Resolution follows the notification record: if notice was proper and the contract allowed proceeding, the manufacturer's records stand. If notice was late or missing, re-test at the manufacturer's cost is the normal outcome.
• Scope creep. The buyer's inspector arrives and starts imposing tests not in the ITP. The answer is the document itself — additional tests are welcome, but as a variation with agreed cost and schedule.
• Competing standards. On a ball valve order, the datasheet says API 598 seat leakage while the purchase note says ISO 5208 rates. The difference surfaces at final test. Reconcile the standards before the ITP is signed, not after.
• The documentation gap. The valve passes every test, but the dossier is missing a heat treatment chart. A final documentation review point — properly assigned as an H or R item — prevents delivery from stalling over paperwork.

The theme in every case is the same: the ITP is not administrative overhead. It is the agreement that decides, in advance, who does what, when, and what happens when someone does not.

An experienced industrial valve maker supplying a complete range — ball valves, control valves, gate valves, globe valves, check valves, strainers, knife gate valves, plug valves, and butterfly valves — can typically support ITP development for engineered orders as a standard part of its commercial process. Send your Valve Schedule or line parameters (size, class, body and trim materials, applicable codes, and any client-specific test scope) to the manufacturer's applications team, and its engineers can propose a practical inspection and test plan matched to your project requirements, with clear notification terms agreed up front.