# Mississippi — US boiler and pressure vessel inspection requirements by state

For Mississippi, governing body is Mississippi State Department of Health, Boiler and Pressure Vessel Safety Branch; statute citation is Mississippi Code, Title 45. Public Safety and Good Order, Chapter 23. Boiler and Pressure Vessel Safety; power boiler inspection interval is Power boilers and high-pressure, high-temperature water boilers shall receive a certificate inspection annually (or as the board may require) and shall receive an annual external inspection while under pressure, if possible; low-pressure boiler inspection interval is Heating boilers shall receive a certificate inspection biennially; pressure vessel inspection interval is Pressure vessels subject to internal corrosion shall receive a certificate inspection biennially. Pressure vessels not subject to internal corrosion shall receive a certificate inspection at intervals set by the board, recorded from its source on 2026-08-05.

- **State:** Mississippi _(verified: appears in the quote below)_
- **Governing body:** Mississippi State Department of Health, Boiler and Pressure Vessel Safety Branch
- **Statute citation:** Mississippi Code, Title 45. Public Safety and Good Order, Chapter 23. Boiler and Pressure Vessel Safety.
- **Power boiler inspection interval:** Power boilers and high-pressure, high-temperature water boilers shall receive a certificate inspection annually (or as the board may require) and shall receive an annual external inspection while under pressure, if possible. _(verified: appears in the quote below)_
- **Low-pressure boiler inspection interval:** Heating boilers shall receive a certificate inspection biennially. _(verified: appears in the quote below)_
- **Pressure vessel inspection interval:** Pressure vessels subject to internal corrosion shall receive a certificate inspection biennially. Pressure vessels not subject to internal corrosion shall receive a certificate inspection at intervals set by the board. _(verified: appears in the quote below)_
- **Accepted inspector types:** Inspections made by insurance company inspectors commissioned by the board are accepted in lieu of inspections made by a department inspector.
- **Exemptions:** Boilers and pressure vessels located on US government property and/or under federal government control. Pressure vessels used for transportation and storage of compressed gases when constructed in compliance with specifications of the US Department of Transportation. Air tanks located on vehicles operating under the rules of other state authorities. Air tanks installed on the right-of-way of railroads. Pressure vessels that do not exceed: 5 cubic feet in volume and 250 psig pressure; 1-1/2 cubic feet in volume and 600 psig pressure; An inside diameter of 6 inches with no limitation on pressure. Pressure vessels operating at a working pressure not exceeding 15 psig. Vessels with a nominal water-containing capacity of 120 gallons or less. Heating boilers located in private residences or apartment houses of fewer than six family units.

## What the source says

> Pressure vessels covered under the Liquefied Compressed Gas Equipment Inspection Law of Mississippi (Sections 75-57-1 through 75-57-63), Mississippi Code of 1972 . Air-receiving tanks and attached tanks used in connection with automobile filling stations that do not exceed 15 cubic feet in volume and 250 psig pressure and used primarily to increase pressure in automobile tires. INSPECTIONS REQUIRED Power boilers and high-pressure, high-temperature water boilers shall receive a certificate inspection annually (or as the board may require) and shall receive an annual external inspection while under pressure, if possible. Heating boilers shall receive a certificate inspection biennially. Pressure vessels subject to internal corrosion shall receive a certificate inspection biennially. Pressure vessels not subject to internal corrosion shall receive a certificate inspection at intervals set by the board.

## Source

- https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US boiler and pressure vessel inspection requirements by state](https://referencesource.org/boiler-inspection-requirements-by-state/).