CMIS, On-site inspections and certifactions of pressure equipment

CMIS, On-site inspections and certifactions of pressure equipment

Services – Design Verification

Colin Mongta Inspection Services Pty Ltd provide a design verification service complying with the requirements of AS3920 (Assurance of product quality) (Pressure equipment manufacture) for the following design codes: AS1210, AS1228, PD5500, EN pressure equipment, GB150, ASME Section 1 and VIII Div 1 & 2, New Zealand Code of Practice.

The Occupational Health & Safety Regulations 2017.

Schedule 2

Pressure equipment, other than pressure piping.
ie: Boiler or pressure vessel of Hazard Level – A, B, C or D, as determined by AS4343.


AS3920 Table F1 (c) - Design verifier

  1. Have satisfactory knowledge, training and experience in design or verification of design of the particular or similar pressure equipment.

  2. Where required by Table 2.1, or as in Clause 3.2 holds an appropriate qualification or certificate as a design verifier from a nationally or internationally recognised body or association. See notes 3 and 4.

    1. have a degree or equivalent in an appropriate engineering discipline plus at least three years relevant experience in the design or design review of pressure equipment; or

    2. hold a certificate or equivalent in an appropriate engineering discipline plus at least four years relevant experience in the design or design review of pressure equipment; or

    3. have other qualifications or experience acceptable to a certifying body or the purchaser; and

    4. comply with the requirements equivalent to the requirements for the acceptance of inspection bodies in AS/NZS ISO/IEC 17020; and

    5. Have no involvement in the particular design other than verification.

    6. Certification of a manufacture inspection or design verifying body shall include the review and acceptance of all personnel employed in addition to the Quality System in place.



    The following elements and methods shall be used to verify the mechanical design and drawings of hazard levels A to D pressure equipment with the specified design Standard and any agreed additional requirements of the purchaser:

       NOTE:  The sequence may differ from that shown.

    1. Design dossier - Verify by visual examination that the documents provided are sufficient and adequate for design verification, and are signed by the designer.

    2. Design input - Verify by visual examination that design input equals calculations and drawing, i.e. Standard and Class, design pressure, diameter, minimum temperature, maximum temperature, volume, contents type and mass, hazard level, material, corrosion allowance, nozzles, flanges, bolting, supports, attachments, access, design loads (piping, seismic, wind, etc.), life (hours, years, cycles), post weld heat treatment (PWHT), non destructive testing (NDT), test pressure and position, and the principal dimensions essential for design.

    3. Material - Verify by visual examination that material is permitted in the design Standard or is an acceptable equivalent, and properties used agree with the design Standard, and are suitable for manufacture and the design service temperature and conditions and for allowable stresses and strains.

    4. Thickness and adequacy of parts - Verify by calculation, visual examination, experience, and/or tests that the following conform to the nominated design Standard:

      1. Pressure and vacuum retaining parts including shells(s), ends, jackets, nozzles, manways, opening, flanges, gaskets, bolts, stays, covers, reinforcing plates, etc. up to the first point of connection to attached piping and other pressure equipment.

      2. Non-pressure parts such as supports and attachments where applicable loads applied to the pressure envelope are significant.

      3. Design values and all necessary load cases.

    5. Welded joints - Verify by visual examination and/or calculation that drawing details of size, type, location and shape are specified and conform to the nominated or equivalent Standard.

    6. Manufacture and welding requirements - Verify by visual examination for reference to a suitable Standard.

    7. Post weld heat treatment (PWHT) - Verify by visual examination that PWHT is specified and appropriate when required by the design and Standard.
    8. Non-destructive testing (NDT) - Verify by visual examination that NDT is adequately referenced and is as required.

    9. Pressure test - Verify by visual examination and/or calculation.

    10. Type testing  - Use successful suitable test results, as appropriate, to verify that the above Items (e) to (i) result in acceptable levels of stress and strain, acceptable resistance to high and low temperatures, acceptable fatigue or impact performance, and provide sufficient performance against other degradation mechanisms such as corrosion or erosion.

    11. Fracture mechanics - Verify the suitability of designs or modifications incorporating fracture mechanics analysis as provided for in AS/NZS 1200, AS 4458 and AS/NZS 3788 or to verify special features that require such analysis.

    12. Designs using finite element analysis (FEA)  For FEA and similar computer analyses, verify that –

      1. The FEA described in the report from the designer [see Clause 4.6(c)] is consistent with Clause 4.10;

      2. The analysis complies with AS 1210 or equivalent;

      3. Reported high stresses, strains or intensities are satisfactory;

      4. By at least one calculation, the thickness of a main pressure part is adequate and confirms the FEA output;

      5. If required by the purchaser a repeat full or partial equivalent FEA confirms the design output; and

      6. If requested by the verifier and approved by the purchaser verification may be undertaken by an audit process at the designer’s office.

    13. Pressure relief devices - Verify by visual examination specifications and capacity of these devices where such components are required by the designer or purchaser to be verified.

    14. Other elements - Verify, on the above basis, other elements of the mechanical design which are essential for proper design verification as specified by the designer or determined by the design verifier.


    At least one calculation of the thickness of the main cylindrical shell, end and nozzle of each pressure equipment section under different pressure shall have been made.

    The above verification shall be based on exper4ience, by recalculation by spreadsheet, hand or computer, by direct check of supplied calculations, or by comparison with proven designs, type test results.

    In the event of non-conformance or doubt, the verifier shall discuss these with the designer giving reasons, and if practical, aid in resolving the issue.  If this is not practicable, a check with a competent pressure equipment design specialist is recommended before final determination.

    Other CMIS Services available:
    Statutory In-Service Inspection   Fabrication Inspection   ASME Boiler & Pressure Vessel (Non -Nuclear)   
    Third Party Inspections   New Zealand PECPR



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