Valve Inspection and Test Plan: Hold and Witness Points

Build a clear valve inspection and test plan. Define hold and witness points, notice periods, acceptance criteria and records before manufacturing.

ZHONGYUE VALVE

11/13/20262 min read

Flanged check valve with a bolted cover and cast body markings

An inspection and test plan, or ITP, helps a valve order move from a purchase specification to a controlled inspection sequence. A useful plan identifies the activity, acceptance reference, responsible parties and retained evidence. It also prevents a common scheduling problem: an inspector is invited only after a manufacturing stage that required attendance has already been completed.

Agree what H, W and R mean

A hold point normally prevents the affected work from proceeding until the authorized party releases it or issues an agreed written waiver. A witness point normally gives a nominated party the opportunity to attend an inspection or test. Whether work may proceed after proper notice without attendance depends on the approved contract procedure. A review point concerns examination of specified documents or records.

Define the symbols in the ITP legend and allocate them separately to manufacturer, purchaser and third-party inspector. Do not rely on assumed industry shorthand. State the notice period, notification channel, response deadline, release authority and waiver process. A witness invitation is not equivalent to release of a hold point.

Build the plan in manufacturing order

Start with the purchase-order items, approved drawings and applicable specifications. A practical sequence can include drawing review, material identity checks, relevant manufacturing records, dimensional inspection, required examinations, assembly, pressure and seat tests, marking, preservation and final document review. The actual sequence and scope depend on the valve design and order; not every examination belongs on every valve.

Give each activity a method or procedure reference, acceptance criteria, inspection extent and record name. If PMI, hardness measurement or nondestructive examination is required, specify the components, sampling basis, governing procedure and acceptance requirements. Avoid an unexplained entry such as “NDT: pass.” Our material traceability guide helps connect component identification with the documentation.

Resolve attendance before production

Consider an illustrative order for several gate valves. The purchaser wants to witness pressure testing on selected items and review all required reports. The plan should identify the selected items or selection method, the tests to be attended and the records required for the remaining valves. Witness sampling must not silently reduce the manufacturer's mandatory testing obligations under the agreed specification.

Ask bidders to identify inspection access, notification lead time, third-party costs and any effect on delivery. If remote witnessing is proposed, agree what the camera must show, how valve identity and readings will be verified, and who signs the record. A recording or photograph does not replace a required witnessed test unless the purchaser accepts that arrangement.

Close the evidence before shipment

Link reports to the purchase order, item or tag, valve identification and approved document revision. Review actual test conditions and results, instrument identification where required, inspector attendance and release signatures. Track nonconformities, approved dispositions and any retesting. A final release note should not conceal an outstanding hold point or missing mandatory record.

Use our valve test report checklist to review the evidence in more detail. See our gate valve product category for a relevant procurement starting point. Send the proposed ITP, project specifications and valve schedule to ZHONGYUE VALVE. Inspection scope, attendance and document deliverables should be confirmed in the technical offer before an order is placed.

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