Inspection for Valve – Procedure

The Third Party Inspection for Valve article provides you with a sample valve inspection and testing procedure in the manufacturing shop. It is particularly suitable for the inspection of Gate, Globe, Ball and Check Valves. This article should be reviewed in conjunction with valve inspection and valve inspection and test plan articles. 

This content guides you through all necessary stages in the production of the industrial valves, including the inspection of manufacturing material, casting, fabrication, dimensional inspection, NDE, final inspection, preservation, packing, and dispatch to site.

You need to take this point into account: this article is written for a typical valve and might not be detailed for special cases.

All valve inspection and testing is done against the approved drawings, purchase order specifications, purchasers or company standards, and within the practices and rules of the country, state or province and any government decrees, laws, ordinance or regulation as may apply.

As a general guide, all valves over 8″ NB will normally be individually witnessed on test. With very large or special valves, such inspection may be extended to detailed component inspection of major components.

Such detail inspection will always apply to valves intended for high pressure steam, cryogenic, nuclear or other critical service, and in such instances, will extend to valves smaller than 8″ NB.

The applicable codes and specifications for a valve that is under the construction process is:

  • Design code
  • Purchase order specification
  • Purchaser’s standards
  • Approved drawings

and the applicable codes and standards are:

  • API 598
  • API 6D
  • API 594
  • ASME / ANSI B16.5
  • API 600, 602, 603, 604

The applicable codes and standards may be based on other international standards. This content is general and can be useful even if the design code is different from the API Code.

Required Documents for Third Party Inspector Review:

The list of documents normally is agreed upon in the Pre-Inspection meeting, which is held several weeks before the actual commencement of the inspection work.

The parties that participate in this meeting are the manufacturer, purchaser and third party inspection agency representatives.

These are the list of documents that are normally agreed upon to be presented to the inspector:

Third Party Inspection for Valve – Material Inspection

The first actual inspection work in the valve is the materials inspection. The original or authenticated copies of mill certificates of material normally are available at the manufacturer’s premises.

The third party inspector examines these certificates for compliance with specifications, and where appropriate, drawings.

The review includes checks on:

  • Certificate No.
  • Heat or cast No.
  • Chemical composition.
  • Mechanical properties.
  • Heat treated condition.
  • NDE applied and results.
  • Surface finish

This covers body stem material, shell material, trim materials, gland materials, anti-friction materials, ball, wedge or flap materials, operating components, support material, well end, flanges and any other specified component.

Then the inspector witnesses the materials identification on the certificates against the materials marking. It is also necessary to check these with the valve drawing datasheet, material list and other specifications as appropriate.

Visual inspection for surface finish and probable defects is done and dimensional compliance with specification need to be controlled, as well.

When third party inspector carries out the material inspection, then provides the inspection visit report (IVR), the report contains the following items:

  • Confirmation of satisfactory document review
  • Record of the endorsement of certification reviewed/witnessed
  • Record of all non-conformities
  • Record of any tests witnessed and the result
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