229 Neb. Admin. Code, ch. 2, § 003
State Special - if, due to a valid impediment to compliance with the original code of construction, a boiler or pressure vessel cannot bear the required construction code and National Board stamping, details in the English language and United States customary units of the proposed construction, material specifications and calculations, approved by a registered professional engineer experienced in boiler and pressure vessels design, shall be submitted to the chief inspector by the owner or operator prior to the boiler or pressure vessel being installed in Nebraska. Approval as a "State Special" may be given where the chief inspector finds the boiler or pressure vessel to be in compliance with acceptable standards and approval is obtained from the Commissioner before construction or installation is started.
229 Neb. Admin. Code, ch. 2, § 003