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R Stamp

R Stamp Certificate of Authorization Program

The National Board offers the Certificate of Authorization and R symbol stamp for the repair and/or alteration of boilers, pressure vessels, and other pressure-retaining items. Requirements are described in NB-415, Accreditation of R Repair Organizations   (en Español).


Organizations seeking a National Board R Certificate of Authorization must complete NB-12, Application for the National Board R Certificate of Authorization and:

  1. have and maintain an inspection agreement with an authorized inspection agency,
  1. have a written quality system that complies with the requirements of the current edition of the National Board Inspection Code (NBIC) and includes the expected scope of activities,
  1. have the current edition of all three parts of the NBIC. Organizations have the option of using either a printed version or an electronic version, including a subscription from a National Board licensed reseller, to fulfill this requirement; and,
  1. have available a copy of the code of construction appropriate for the intended scope of work.

Prior to issuance of a National Board R Certificate of Authorization, the organization and its facilities are subject to a review of its quality system (referred to as a Joint Review).

Estimated Fees

Certification Fees:

The fee for renewal of the R Certificate of Authorization is $630 USD for a three-year period. The fee for a new issuance is $705 USD which includes a one-time charge of $75 USD for the loan of the R stamp.

Joint Review Fees:

The review of an organization’s quality control system for R certification can be performed in conjunction with its ASME review, where applicable, or as a standalone review if the organization does not hold an ASME Certificate.

The review may be conducted by a National Board member jurisdiction or by a representative of the National Board, depending upon jurisdictional requirements.

Please Contact Us (Accreditation) to determine who will perform the quality control system review and information on the associated joint review fees.

Cancellation Fees:

Withdrawal of an application in-process will result in a $315 USD cancellation fee. If a review has been scheduled by the National Board and is cancelled, other cancellation fees may apply.


Organizations holding an R Certificate of Authorization who change ownership, name, location, and/or scopes must submit a revised application along with a copy of their quality control manual cover sheet, statement of authority page, and an inspector signature indicating acceptance of the changes. There is a fee of $50 USD for a change to a certificate.

The appropriate jurisdiction will be notified, and that jurisdiction may require a joint review of the facilities and quality control manual.

If there are questions on the certification program, please Contact Us (Accreditation)  or email/fax the Accreditation Department.

Payment Options

Payment of the certificate fee, stamp and advance deposit, if applicable, can be made by check or by credit card.

If paying by check, please remit to:

     The National Board of Boiler and Pressure Vessel Inspectors
     Attention: Accounting Department
     1055 Crupper Avenue
     Columbus, OH 43229-1183

For credit card payments, we accept MasterCard, Visa and American Express.  For security reasons, we do not accept credit card payments via email.  If you prefer this method of payment, please call the National Board Accounting Department at 614.888.8320 ext. 217 or fax your information to 614.985.4615.

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