The Third-Party Inspection for Pressure Vessel article gives an example technique for Pressure Vessel assessment and testing in the fabrication shop. This article should be evaluated with a pressure vessel inspection and test plan (ITP). 

This article guides you through all the fundamental stages in creating the pressure vessels, including the material, dimensional, welding, testing, final inspection, packing, preservation, and shipment to the site. 

You must consider this point: this article is composed of a commonplace pressure vessel and won’t be for uncommon cases. 

All pressure vessel inspections and testing are done against the approved drawings, purchase orders, buyers, or organization guidelines, and inside the practices and principles of the national, state, or region and any administration orders, laws, mandate, or direction as may apply.

The relevant codes and details for a pressure vessel that is under the development procedure are: 

• Design code 

• Purchase Order 

• Purchaser’s specification 

• Approved drawings

Furthermore, the material codes and standards are: 

• ASME VIII Division 1 or 2 



The material codes and standards might be based on other global benchmarks, for example, BS 5500 and so forth. However, this substance is general and can be valuable if even the outline code is not quite the same as ASME Code. 

Third-party Inspection for Pressure Vessel – Required Documents for Third Party Inspector Review: 

The rundown of needed documentation is settled upon in the Pre-Inspection meeting, held half a month (if you’re lucky) before the real beginning of the inspection work. 

The parties interested in this meeting are the manufacturer, buyer, and third-party examination office agents. 

These are the rundown of reports which are ordinarily consented to be exhibited to the overseer: 

  • Pressure Vessel Manufacture Quality Control Plan 

• Pressure Vessel Inspection and Test Plan 

• Pressure Vessel Data Sheet 

• Pressure Vessel Approved Drawings 

• Pressure Vessel Strength Calculation Sheets 

• Pressure Vessel Material Test Reports 

• Pressure Vessel Welding Specification Procedures (WPS) and Procedure Qualification Records(PQR) 

• Pressure Vessel Welding Map 

• Pressure Vessel Welders Qualifications Reports 

• Pressure Vessel NDE Procedures (Radiograph, Ultrasonic, Magnetic Particle, Dye Penetration, etc.) 

• Pressure Vessel NDE Personnel Qualifications Reports 

• Pressure Vessel Heat Treatment Procedure 

• Pressure Vessel Calibration Certificates for Test Equipment 

• Pressure Vessel Hydrostatic Testing Procedure and Water Quality Document 

• Pressure Vessel Preparation and Painting Procedure 

• Pressure Vessel Preservation, Packing, and Shipping Procedure 

• Pressure Vessel Packing List 

Third-party Inspection for Pressure Vessel – Material Inspection 

The first step in inspecting a pressure vessel is examining the raw material. According to the ASME Code, giving material test reports to pressure vessel plates is mandatory. For different parts, the checking markings will be sufficient. 

Yet, if the buyer arranges has commanded the MTRs to accommodate all parts, for example, nozzle pipe, fittings, etc. At that point, the fabricator also needs to give them. 

The first or confirmed duplicates of MTRs for plates ordinarily are accessible at the producer’s premises. 

The third-party assessor analyzes these testaments for consistency with determinations and illustrations where suitable. 

The survey incorporates an eye on: 

• Certificate No. 

• Heat or Cast No. 

• Chemical Composition 

• Mechanical Properties 

• Heat Treated Condition. 

• NDE Applied and Results. 

At that point, the assessor witnesses the plate material ID on the certification against the plate stamping. It is likewise essential to check the identification with the pressure vessel drawing datasheet, material rundown, and different fitting details. 

The traceability of markings to cut-off plates likewise is checked. 

Visual reviews for surface conditions and plausible imperfections are done, and dimensional consistency with additionally should be controlled. 

At the point when the third-party overseer does the material examination at that point gives the inspection report (IR), the report contains the accompanying things: 

• Confirmation of satisfactory document review

• Record of the underwriting of confirmation investigated/witnessed

• Record of all non-conformities

• Record of any tests witnessed and the outcome 

Third-party Inspection for Pressure Vessel – Fabrication 

At the point when the pressure vessel raw material review is done, and the outcomes are satisfactory, or non-conformities were closed out, at that point, the pressure vessel manufacturer will begin fabrication.

The third-party examiner checks the accompanying focuses on the pressure vessel because of the inspection and test design (ITP), which has been settled upon between the buyer and the pressure vessel producer. 

The review scope is documented in the ITP. A few buyers want stringent controls and appoint the TPI for more “hold or witness points” for examination and test exercises. Others favor less “hold or witness points” and allot the TPI considerably more work in the “audit of records.” 

This depends on the examination budget plan, which buyers relegate for inspections. Substantially more investigation will have a considerably higher cost and less hazard, and then again, less review will have less cost and more dangers, however. 

Third-party Inspection for Pressure Vessel – Preparation for Welding 

The third-party inspector completes the visual and dimensional check to guarantee consistent WPS and other specifications where the required code technique analyzes determined weld bevels after grinding/machining. 

Fundamentally, the edges and bevels are clean, dry, and free from surface imperfections, laminations, cracks, voids, notches, voids, scores, etc. 

They are foundations for rejection except if reasonable/satisfactory action can address these indications.

Weld repairs are carried out per the code requirements and approved by the client before welding proceeds, and severe or excessive defects typically are reported.

Third-party Inspection for Pressure Vessel – Fit-Up Inspection 

Shapes and measurements are checked as per the endorsed WPS and drawing. 

Tack welds are created utilizing the material WPS conditions, and it is important to be visually free from defects 

Magnetic Testing (MT) or Penetration Testing (PT) might be performed as per the code prerequisite if the need arises. 

Third-party Inspection for Pressure Vessel – Monitoring of Weld Conditions 

The third-party examiner will need to verify the preheat temperature and method, interpass temperatures, weld material control, welder, and process capabilities for conformity to the code prerequisites. 

Third-party Inspection for Pressure Vessel – Back Gouging Inspection 

The third-party inspector will need to verify the shape and measurements of the back gouged groove for adjustment to the WPS necessity. 

The visual appearance must be spotless and free from defects. NDE examination is done as per the code requirements if needed. 

Third-party Inspection for Pressure Vessel – Visual Weld Inspection 

After fulfillment of all welding and grinding tasks, a visual examination affirms there are no deformities, for example, cracks, lack of fusion, surface porosity or exposed slag inclusions, incomplete penetration, and the incorrect profile of the weld, lack of leg length, and overlap.

Temporary connections are evacuated, the ground smooth, and the regions are checked for defects by MT or PT.

Third-party Inspection for Pressure Vessel – Non-Destructive Examination 

A skilled workforce performs NDE in the endorsed methods. The techniques available are subject to the vessel classification and the materials utilized. The level (amount) of the RT test ought to be performed based on the pressure vessel joint efficiencies. 

Third-party Inspection for Pressure Vessel – Weld Repair 

The pressure vessel weld repairs are finished utilizing an approved WPS procedure and retested in a like manner. 

All repairs must be repaired before any post-weld warm treatment is done. 

Third-party Inspection for Pressure Vessel – Post Weld Heat Treatment 

The third-party auditor checks the post-weld heat treatment record of the temperature and time as per the affirmed code/procedures.

The results of hardness tests are assessed as per the code prerequisites. 

Third-party Inspection for Pressure Vessel – Dimensional Measurement and Visual Inspection 

The third-party inspector checks every significant measurement and the position, orientation, rise, and projection of nozzles and attachments and guarantees they are as per the code prerequisites and affirmed drawings. 

What’s more, the third-party inspector completes a complete visual examination of both inside (where practicable) and outside surfaces of the vessel. 

Specific consideration is paid to the cleanliness of the inside of the vessel, the condition/appearance of welds and related areas, and the state of the sealing faces. 

Third-party Inspection for Pressure Vessel – Pneumatic Test 

The third-party investigator witnesses the low-pressure pneumatic test for nozzle reinforcing pads, support saddles, or other attachments when specified by the approved low-pressure pneumatic test procedure using soapy water as the indicating medium.

A minimum of 1 gauge with correct working ranges is used as described by the code.

Third-party Inspection for Pressure Vessel – Hydrostatic Testing 

The third-party monitor controls the accompanying things for Hydrostatic Testing: 

• Calibration status and suitable working range of measures. At least 2 pressure gauges are connected to everything under testing. 

• Adequate arrangement for venting of high points and draining is given. 

• Test pressure is connected as coordinated by system or code until the point that as far as possible pressure is reached. During the hold period, a systematic check for leaks is conducted. 

• Test pressures and metal and water temperatures are recorded. 

• Water quality is as indicated. Some procedures will have the fabricator test their water supply before testing.

The auditor analyzes unique prerequisites of the buyer’s procedure for deflection or strain gauges or pressure/time/temperature accounts, and the records are confirmed.

Third-party Inspection for Pressure Vessel – Final Inspection 

After hydrostatic testing, the vessel is completely drained and dried out by approved techniques. Finally, every internal fitting, connection, coatings, or prerequisites should be finished. 

The predetermined post hydrostatic test NDE should be finished, and the vessel shut. All pressure vessels are checked for cleanliness and dryness by an approved strategy. 

The third-party inspectors will need to recheck the nozzles, saddle, and bracket locations and orientations against the assembly drawings.

Third-party Inspection for Pressure Vessel – Name Plate 

The content of the stamping is checked as per the approved drawing and particulars by the third-party inspector 

Third-party Inspection for Pressure Vessel – Painting and Coating Inspection 

Surface readiness for painting is checked for the accompanying focuses, as per determination by the third-party examiner: 

• Cleaning technique (Blast or scratching and wire brushing) 

• Preparation grades, i.e., white metal cleaning, close white metal cleaning, etc. 

• Surface profile check 

• Free from weld spatter, porosity, and different imperfections 

• Dry film thickness is checked according to specification

The surface condition of the final coat should be free from pinholes, runs, drips, blisters, and other discontinuity

Third-party Inspection for Pressure Vessel – Spares and Accessories 

The third-party inspector should check extras, tools, and accessories and makes a visual and dimensional examination for materials, workmanship, and quantities as per the PO detail and packing list 

The stamping, as well as the tag, is checked for identification 

Third-party Inspection for Pressure Vessel – Pressure Vessel Reporting 

The third-party inspector provides an Inspection Report (IR) after each visit and a final report summarizing the activities carried out during the pressure vessel production per the contract requirements and circulated within the time limits specified in the contract. In addition, the pressure vessel ITP is verified to make sure all listed items are completed and subjected to inspection/testing. 

The report is in the configuration required by the customer and unmistakably shows the last acknowledgment or dismissal of the pressure vessel. 

Third-party Inspection for Pressure Vessel – Pressure Vessel Release Note 

When required by the agreement or buyer arrangement, a release note is issued by the third-party inspector and given to the manufacturer when the pressure vessels have been accepted. 

Third-party Inspection for Pressure Vessel – Packing, Marking and Shipping 

The third-party overseer checks the accompanying focuses: 

• Cleanliness and dryness of pressure vessels 

• Rust aversion for all machined surfaces 

• Protection for cover for all opening and protruding parts 

• Packing review/style and appropriately for abroad transportation 

• Shipping marks and different markings and warning of welding denied, and so on. 

• Where the nitrogen purge specifies the gas, the pressure is checked, and the nearness of warning notices is checked. 

Third-party Inspection for Pressure Vessel – Pressure Vessel Final Book (Dossier) 

The accompanying final records are checked on and closed down by the third-party auditor: 

As-built, drawings if required, manufacturer’s data reports, Material certificate or certified mill test reports for all pressure parts, Material list or map, Welder record for each seam or map, Heat treatment records (Temperature-time record chart during PWHT), Dimensional record, NDE records, Production test record/mock test record, positive material identification (PMI) records (if required), hydrostatic test record, Pneumatic test record, Hardness test record, Post weld heat treatment NDE, if specified, Nameplate or other marks, Packing list, Spare parts, and tool list.