Miss. Code § 45-23-41
Each company employing special inspectors, except a company operating boilers and/or pressure vessels covered by owner or user inspection service meeting the requirements of Section 45-23-21(b) shall, within thirty (30) days following each certificate inspection made by such inspectors, file a report of such inspection with the chief inspector upon appropriate forms as promulgated by the board. If such report shows that a boiler or pressure vessel is found to comply with the rules and regulations of the board, the owner or user thereof shall pay directly to the board the fee of Twenty Dollars ($20.00) for an annual certificate or Thirty Dollars ($30.00) for a biennial certificate, and the chief inspector or his duly authorized representative shall issue to such owner or user an inspection certificate bearing the date of inspection and specifying the maximum pressure under which the boiler or pressure vessel may be operated. Any increase in the fee charged by the board under this section shall be in accordance with the provisions of Section 41-3-65.
Such inspection certificate shall be valid for not more than fourteen (14) months from its date in the case of power boilers and high pressure, high temperature water boilers, and for not more than twenty-six (26) months in the case of heating boilers and pressure vessels.
In the case of those boilers and pressure vessels covered by Section 45-23-33(a), (b), (c) and (d) for which the board has established or extended the operating period between required inspections, pursuant to the provisions of Section 45-23-33(g) or (h), the certificate shall be valid for a period not more than two (2) months beyond the period set by the board.
Certificates shall be posted under glass in the room containing the boiler or pressure vessel inspected. If the boiler or pressure vessel is not located within the building, the certificate shall be posted in a location convenient to the boiler or pressure vessel inspected, or in any place where it will be accessible to interested parties.
Air tanks used to inflate automobile tires shall be exempt from the inspection requirements of this section.
Miss. Code § 45-23-41