{"formats":[{"name":"JSON","format":"json","url":"\/downloads\/2025\/code-json\/40.1-51.8.json"},{"name":"Plain Text","format":"text","url":"\/downloads\/2025\/code-text\/40.1-51.8.txt"},{"name":"XML","format":"xml","url":"\/downloads\/2025\/code-xml\/40.1-51.8.xml"},{"name":"HTML","format":"html","url":"\/downloads\/2025\/code-html\/40.1-51.8.html"}],"law_id":55259,"edition_id":1,"section_id":55259,"structure_id":14122,"section_number":"40.1-51.8","catch_line":"Exemptions","history":"1972, c. 237; 1977, c. 301; 1978, c. 355; 1986, c. 211; 1988, c. 289; 1990, c. 226; 1993, c. 543; 1999, c. 335; 2000, c. 898; 2012, c. 332; 2013, c. 171.","full_text":"The provisions of this article shall not apply to any of the following:\n\n1\n\nBoilers or unfired pressure vessels owned or operated by the federal government or any agency thereof;2\n\nBoilers or fired or unfired pressure vessels used in or on the property of private residences or apartment houses of less than four apartments;3\n\nBoilers of railroad companies maintained on railborne vehicles or those used to propel waterborne vessels;4\n\nHobby or model boilers as defined in § 40.1-51.19:1;5\n\nHot water supply boilers, water heaters, and unfired pressure vessels used as hot water supply storage tanks heated by steam or any other indirect means when the following limitations are not exceeded:\n\t\t\ta. A heat input of 200,000 British thermal units per hour;\n\t\t\tb. A water temperature of 210° Fahrenheit;\n\t\t\tc. A water-containing capacity of 120 gallons;6\n\nUnfired pressure vessels containing air only which are located on vehicles or vessels designed and used primarily for transporting passengers or freight;7\n\nUnfired pressure vessels containing air only, installed on the right-of-way of railroads and used directly in the operation of trains;8\n\nUnfired pressure vessels used for containing water under pressure when either of the following are not exceeded:\n\t\t\ta. A design pressure of 300 psi; or\n\t\t\tb. A design temperature of 210° Fahrenheit;9\n\nUnfired pressure vessels containing water in combination with air pressure, the compression of which serves only as a cushion, that do not exceed:\n\t\t\ta. A design pressure of 300 psi;\n\t\t\tb. A design temperature of 210° Fahrenheit; or\n\t\t\tc. A water-containing capacity of 120 gallons;10\n\nUnfired pressure vessels containing air only, providing the volume does not exceed eight cubic feet nor the operating pressure is not greater than 175 pounds;11\n\nUnfired pressure vessels having an operating pressure not exceeding fifteen pounds with no limitation on size;12\n\nPressure vessels that do not exceed:\n\t\t\ta. Five cubic feet in volume and 250 pounds per square inch gauge pressure;\n\t\t\tb. One and one-half cubic feet in volume and 600 pounds per square inch gauge pressure; and\n\t\t\tc. An inside diameter of six inches with no limitations on gauge pressure;13\n\nPressure vessels used for transportation or storage of compressed gases when constructed in compliance with the specifications of the United States Department of Transportation and when charged with gas marked, maintained, and periodically requalified for use, as required by appropriate regulations of the United States Department of Transportation;14\n\nStationary American Society of Mechanical Engineers (ASME) LP-Gas containers used exclusively in propane service with a capacity that does not exceed 2,000 gallons if the owner of the container or the owner’s servicing agent:\n\t\t\ta. Conducts an inspection of the container not less frequently than every five years, in which all visible parts of the container, including insulation or coating, structural attachments, and vessel connections, are inspected for corrosion, distortion, cracking, evidence of leakage, fire damage, or other condition indicating impairment;\n\t\t\tb. Maintains a record of the most recent inspection of the container conducted in accordance with subdivision a; and\n\t\t\tc. Makes the records required to be maintained in accordance with subdivision b available for inspection by the Commissioner;15\n\nUnfired pressure vessels used in and as a part of electric substations owned or operated by an electric utility, provided such electric substation is enclosed, locked, and inaccessible to the public; or16\n\nCoil type hot water boilers without any steam space where water flashes into steam when released through a manually operated nozzle, unless steam is generated within the coil or unless one of the following limitations is exceeded:\n\t\t\ta. Three-fourths inch diameter tubing or pipe size with no drums or headers attached;\n\t\t\tb. Nominal water containing capacity not exceeding six gallons; and\n\t\t\tc. Water temperature not exceeding 350° Fahrenheit.","order_by":null,"text":{"0":{"id":202620,"text":"The provisions of this article shall not apply to any of the following:","type":"section","prefixes":[""],"prefix":"","entire_prefix":"","prefix_anchor":"","level":1,"next_prefix":"1"},"1":{"id":202621,"text":"Boilers or unfired pressure vessels owned or operated by the federal government or any agency thereof;","type":"section","prefixes":["1"],"prefix":"1","entire_prefix":"1","prefix_anchor":"1","level":1,"prior_prefix":"","next_prefix":"2"},"2":{"id":202622,"text":"Boilers or fired or unfired pressure vessels used in or on the property of private residences or apartment houses of less than four apartments;","type":"section","prefixes":["2"],"prefix":"2","entire_prefix":"2","prefix_anchor":"2","level":1,"prior_prefix":"1","next_prefix":"3"},"3":{"id":202623,"text":"Boilers of railroad companies maintained on railborne vehicles or those used to propel waterborne vessels;","type":"section","prefixes":["3"],"prefix":"3","entire_prefix":"3","prefix_anchor":"3","level":1,"prior_prefix":"2","next_prefix":"4"},"4":{"id":202624,"text":"Hobby or model boilers as defined in § 40.1-51.19:1;","type":"section","prefixes":["4"],"prefix":"4","entire_prefix":"4","prefix_anchor":"4","level":1,"prior_prefix":"3","next_prefix":"5"},"5":{"id":202625,"text":"Hot water supply boilers, water heaters, and unfired pressure vessels used as hot water supply storage tanks heated by steam or any other indirect means when the following limitations are not exceeded:\n\t\t\ta. A heat input of 200,000 British thermal units per hour;\n\t\t\tb. A water temperature of 210° Fahrenheit;\n\t\t\tc. A water-containing capacity of 120 gallons;","type":"section","prefixes":["5"],"prefix":"5","entire_prefix":"5","prefix_anchor":"5","level":1,"prior_prefix":"4","next_prefix":"6"},"6":{"id":202626,"text":"Unfired pressure vessels containing air only which are located on vehicles or vessels designed and used primarily for transporting passengers or freight;","type":"section","prefixes":["6"],"prefix":"6","entire_prefix":"6","prefix_anchor":"6","level":1,"prior_prefix":"5","next_prefix":"7"},"7":{"id":202627,"text":"Unfired pressure vessels containing air only, installed on the right-of-way of railroads and used directly in the operation of trains;","type":"section","prefixes":["7"],"prefix":"7","entire_prefix":"7","prefix_anchor":"7","level":1,"prior_prefix":"6","next_prefix":"8"},"8":{"id":202628,"text":"Unfired pressure vessels used for containing water under pressure when either of the following are not exceeded:\n\t\t\ta. A design pressure of 300 psi; or\n\t\t\tb. A design temperature of 210° Fahrenheit;","type":"section","prefixes":["8"],"prefix":"8","entire_prefix":"8","prefix_anchor":"8","level":1,"prior_prefix":"7","next_prefix":"9"},"9":{"id":202629,"text":"Unfired pressure vessels containing water in combination with air pressure, the compression of which serves only as a cushion, that do not exceed:\n\t\t\ta. A design pressure of 300 psi;\n\t\t\tb. A design temperature of 210° Fahrenheit; or\n\t\t\tc. A water-containing capacity of 120 gallons;","type":"section","prefixes":["9"],"prefix":"9","entire_prefix":"9","prefix_anchor":"9","level":1,"prior_prefix":"8","next_prefix":"10"},"10":{"id":202630,"text":"Unfired pressure vessels containing air only, providing the volume does not exceed eight cubic feet nor the operating pressure is not greater than 175 pounds;","type":"section","prefixes":["10"],"prefix":"10","entire_prefix":"10","prefix_anchor":"10","level":1,"prior_prefix":"9","next_prefix":"11"},"11":{"id":202631,"text":"Unfired pressure vessels having an operating pressure not exceeding fifteen pounds with no limitation on size;","type":"section","prefixes":["11"],"prefix":"11","entire_prefix":"11","prefix_anchor":"11","level":1,"prior_prefix":"10","next_prefix":"12"},"12":{"id":202632,"text":"Pressure vessels that do not exceed:\n\t\t\ta. Five cubic feet in volume and 250 pounds per square inch gauge pressure;\n\t\t\tb. One and one-half cubic feet in volume and 600 pounds per square inch gauge pressure; and\n\t\t\tc. An inside diameter of six inches with no limitations on gauge pressure;","type":"section","prefixes":["12"],"prefix":"12","entire_prefix":"12","prefix_anchor":"12","level":1,"prior_prefix":"11","next_prefix":"13"},"13":{"id":202633,"text":"Pressure vessels used for transportation or storage of compressed gases when constructed in compliance with the specifications of the United States Department of Transportation and when charged with gas marked, maintained, and periodically requalified for use, as required by appropriate regulations of the United States Department of Transportation;","type":"section","prefixes":["13"],"prefix":"13","entire_prefix":"13","prefix_anchor":"13","level":1,"prior_prefix":"12","next_prefix":"14"},"14":{"id":202634,"text":"Stationary American Society of Mechanical Engineers (ASME) LP-Gas containers used exclusively in propane service with a capacity that does not exceed 2,000 gallons if the owner of the container or the owner’s servicing agent:\n\t\t\ta. Conducts an inspection of the container not less frequently than every five years, in which all visible parts of the container, including insulation or coating, structural attachments, and vessel connections, are inspected for corrosion, distortion, cracking, evidence of leakage, fire damage, or other condition indicating impairment;\n\t\t\tb. Maintains a record of the most recent inspection of the container conducted in accordance with subdivision a; and\n\t\t\tc. Makes the records required to be maintained in accordance with subdivision b available for inspection by the Commissioner;","type":"section","prefixes":["14"],"prefix":"14","entire_prefix":"14","prefix_anchor":"14","level":1,"prior_prefix":"13","next_prefix":"15"},"15":{"id":202635,"text":"Unfired pressure vessels used in and as a part of electric substations owned or operated by an electric utility, provided such electric substation is enclosed, locked, and inaccessible to the public; or","type":"section","prefixes":["15"],"prefix":"15","entire_prefix":"15","prefix_anchor":"15","level":1,"prior_prefix":"14","next_prefix":"16"},"16":{"id":202636,"text":"Coil type hot water boilers without any steam space where water flashes into steam when released through a manually operated nozzle, unless steam is generated within the coil or unless one of the following limitations is exceeded:\n\t\t\ta. Three-fourths inch diameter tubing or pipe size with no drums or headers attached;\n\t\t\tb. Nominal water containing capacity not exceeding six gallons; and\n\t\t\tc. Water temperature not exceeding 350° Fahrenheit.","type":"section","prefixes":["16"],"prefix":"16","entire_prefix":"16","prefix_anchor":"16","level":1,"prior_prefix":"15"}},"ancestry":[{"id":14122,"edition_id":1,"name":"In General","identifier":"1","label":"article","depth":3,"order_by":1,"parent_id":14121,"metadata":{},"date_created":"2026-06-26 03:46:56","date_modified":"2026-06-26 03:46:56","permalink":{"id":220177,"object_type":"structure","relational_id":14122,"identifier":"1","token":"40.1\/3.1\/1","url":"\/40.1\/3.1\/1\/","edition_id":1,"permalink":0,"preferred":1}},{"id":14121,"edition_id":1,"name":"Boiler and Pressure Vessel Safety Act","identifier":"3.1","label":"chapter","depth":2,"order_by":1,"parent_id":12776,"metadata":{},"date_created":"2026-06-26 03:46:56","date_modified":"2026-06-26 03:46:56","permalink":{"id":220175,"object_type":"structure","relational_id":14121,"identifier":"3.1","token":"40.1\/3.1","url":"\/40.1\/3.1\/","edition_id":1,"permalink":0,"preferred":1}},{"id":12776,"edition_id":1,"name":"Labor and Employment","identifier":"40.1","label":"title","depth":1,"order_by":1,"parent_id":null,"metadata":{},"date_created":"2026-06-26 03:43:52","date_modified":"2026-06-26 03:43:52","permalink":{"id":219723,"object_type":"structure","relational_id":12776,"identifier":"40.1","token":"40.1","url":"\/40.1\/","edition_id":1,"permalink":0,"preferred":1}}],"structure_contents":[{"id":67636,"structure_id":14122,"section_number":"40.1-51.10","catch_line":"Right of access to premises; certification and recertification; inspection requirements","url":"\/40.1-51.10\/","token":"40.1\/3.1\/1\/40.1-51.10","metadata":false},{"id":73578,"structure_id":14122,"section_number":"40.1-51.10:1","catch_line":"Issuance of certificates; charges","url":"\/40.1-51.10_1\/","token":"40.1\/3.1\/1\/40.1-51.10_1","metadata":false},{"id":72821,"structure_id":14122,"section_number":"40.1-51.11","catch_line":"Suspension of inspection certificate; injunctive relief","url":"\/40.1-51.11\/","token":"40.1\/3.1\/1\/40.1-51.11","metadata":false},{"id":64517,"structure_id":14122,"section_number":"40.1-51.11:1","catch_line":"Owner-user inspection agencies","url":"\/40.1-51.11_1\/","token":"40.1\/3.1\/1\/40.1-51.11_1","metadata":false},{"id":83915,"structure_id":14122,"section_number":"40.1-51.12","catch_line":"Violation for operating boiler or pressure vessel without inspection certificate; civil penalty","url":"\/40.1-51.12\/","token":"40.1\/3.1\/1\/40.1-51.12","metadata":false},{"id":66500,"structure_id":14122,"section_number":"40.1-51.13","catch_line":"Posting of certificate","url":"\/40.1-51.13\/","token":"40.1\/3.1\/1\/40.1-51.13","metadata":false},{"id":86209,"structure_id":14122,"section_number":"40.1-51.14","catch_line":"When inspection certificate for insured boiler or pressure vessel invalid","url":"\/40.1-51.14\/","token":"40.1\/3.1\/1\/40.1-51.14","metadata":false},{"id":61482,"structure_id":14122,"section_number":"40.1-51.15","catch_line":"Fees","url":"\/40.1-51.15\/","token":"40.1\/3.1\/1\/40.1-51.15","metadata":false},{"id":84895,"structure_id":14122,"section_number":"40.1-51.15:1","catch_line":"Only one inspection necessary","url":"\/40.1-51.15_1\/","token":"40.1\/3.1\/1\/40.1-51.15_1","metadata":false},{"id":55784,"structure_id":14122,"section_number":"40.1-51.16","catch_line":"Appeals","url":"\/40.1-51.16\/","token":"40.1\/3.1\/1\/40.1-51.16","metadata":false},{"id":80961,"structure_id":14122,"section_number":"40.1-51.17","catch_line":"Effect of chapter on local ordinances and regulations","url":"\/40.1-51.17\/","token":"40.1\/3.1\/1\/40.1-51.17","metadata":false},{"id":63481,"structure_id":14122,"section_number":"40.1-51.18","catch_line":"Repealed","url":"\/40.1-51.18\/","token":"40.1\/3.1\/1\/40.1-51.18","metadata":false},{"id":68895,"structure_id":14122,"section_number":"40.1-51.19","catch_line":"Variances","url":"\/40.1-51.19\/","token":"40.1\/3.1\/1\/40.1-51.19","metadata":false},{"id":72664,"structure_id":14122,"section_number":"40.1-51.5","catch_line":"Short title; definitions","url":"\/40.1-51.5\/","token":"40.1\/3.1\/1\/40.1-51.5","metadata":false},{"id":59511,"structure_id":14122,"section_number":"40.1-51.6","catch_line":"Safety and Health Codes Board to formulate rules, regulations, etc.; cost of administration","url":"\/40.1-51.6\/","token":"40.1\/3.1\/1\/40.1-51.6","metadata":false},{"id":59387,"structure_id":14122,"section_number":"40.1-51.7","catch_line":"Installations, repairs and alterations to conform to rules and regulations; existing installations","url":"\/40.1-51.7\/","token":"40.1\/3.1\/1\/40.1-51.7","metadata":false},{"id":55259,"structure_id":14122,"section_number":"40.1-51.8","catch_line":"Exemptions","url":"\/40.1-51.8\/","token":"40.1\/3.1\/1\/40.1-51.8","metadata":false},{"id":64630,"structure_id":14122,"section_number":"40.1-51.9","catch_line":"Employment and appointment of inspectors and other personnel; inspections; reports","url":"\/40.1-51.9\/","token":"40.1\/3.1\/1\/40.1-51.9","metadata":false},{"id":68727,"structure_id":14122,"section_number":"40.1-51.9:1","catch_line":"Examination of inspectors; certificate of competency required","url":"\/40.1-51.9_1\/","token":"40.1\/3.1\/1\/40.1-51.9_1","metadata":false},{"id":56735,"structure_id":14122,"section_number":"40.1-51.9:2","catch_line":"Financial responsibility requirements for contract fee inspectors","url":"\/40.1-51.9_2\/","token":"40.1\/3.1\/1\/40.1-51.9_2","metadata":false}],"previous_section":{"id":59387,"structure_id":14122,"section_number":"40.1-51.7","catch_line":"Installations, repairs and alterations to conform to rules and regulations; existing installations","url":"\/40.1-51.7\/","token":"40.1\/3.1\/1\/40.1-51.7","metadata":false},"next_section":{"id":64630,"structure_id":14122,"section_number":"40.1-51.9","catch_line":"Employment and appointment of inspectors and other personnel; inspections; reports","url":"\/40.1-51.9\/","token":"40.1\/3.1\/1\/40.1-51.9","metadata":false},"metadata":false,"official_url":"https:\/\/law.lis.virginia.gov\/vacode\/40.1-51.8\/","history_text":"

This law was first created in 1972. The record of its establishment is cataloged in chapter 237 of that year\u2019s edition of \u201cActs of Assembly,\u201d the annual state publication listing all changes made to the Code of Virginia in that year. Unfortunately, the 1972 \u201cActs\u201d aren\u2019t available online. It has been modified 10 times. Those modifications are cataloged by \u201cThe Acts of Assembly,\u201d a state publication, by year and chapter. Those modifications that can be read on the General Assembly\u2019s website will be linked accordingly. Those modifications are as follows: in 1977, chapter 301; in 1978, chapter 355; in 1986, chapter 211; in 1988, chapter 289; in 1990, chapter 226; in 1993, chapter 543; in 1999, chapter 335<\/a>; in 2000, chapter 898<\/a>; in 2012, chapter 332<\/a>; in 2013, chapter 171<\/a>.<\/p>","references":false,"refers_to":[{"id":77255,"section_number":"40.1-51.19:1","catch_line":"Definitions","order_by":null,"url":"\/40.1-51.19_1\/"}],"permalink":{"id":220243,"object_type":"law","relational_id":55259,"identifier":"40.1-51.8","token":"40.1\/3.1\/1\/40.1-51.8","url":"\/40.1-51.8\/","edition_id":1,"permalink":0,"preferred":1},"url":"\/40.1-51.8\/","token":"40.1\/3.1\/1\/40.1-51.8","dublin_core":{"Title":"Exemptions","Type":"Text","Format":"text\/html","Identifier":"\u00a7 40.1-51.8","Relation":"Code of Virginia"},"html":"\n\t\t\t\t\t\t

The provisions of this article shall not apply to any of the following:<\/p><\/section>\n\t\t\t\t\t\t

1.<\/span> Boilers<\/span> or unfired pressure vessels owned or operated by the federal government or any agency thereof; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

2.<\/span> Boilers<\/span> or fired or unfired pressure vessels used in or on the property of private residences or apartment houses of less than four apartments; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

3.<\/span> Boilers<\/span> of railroad companies maintained on railborne vehicles or those used to propel waterborne vessels; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

4.<\/span> Hobby or model boilers<\/span> as defined in § 40.1-51.19:1<\/a>; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

5.<\/span> Hot water supply boilers<\/span>, water heaters<\/span>, and unfired pressure vessels used as hot water supply storage tanks heated by steam or any other indirect means when the following limitations are not exceeded:\n\t\t\ta. A heat input of 200,000 British thermal units per hour;\n\t\t\tb. A water temperature of 210° Fahrenheit;\n\t\t\tc. A water-containing capacity of 120 gallons; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

6.<\/span> Unfired pressure vessels containing air only which are located on vehicles or vessels designed and used primarily for transporting passengers or freight; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

7.<\/span> Unfired pressure vessels containing air only, installed on the right-of-way of railroads and used directly in the operation of trains; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

8.<\/span> Unfired pressure vessels used for containing water under pressure when either of the following are not exceeded:\n\t\t\ta. A design pressure of 300 psi; or\n\t\t\tb. A design temperature of 210° Fahrenheit; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

9.<\/span> Unfired pressure vessels containing water in combination with air pressure, the compression of which serves only as a cushion, that do not exceed:\n\t\t\ta. A design pressure of 300 psi;\n\t\t\tb. A design temperature of 210° Fahrenheit; or\n\t\t\tc. A water-containing capacity of 120 gallons; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

10.<\/span> Unfired pressure vessels containing air only, providing the volume does not exceed eight cubic feet nor the operating pressure is not greater than 175 pounds; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

11.<\/span> Unfired pressure vessels having an operating pressure not exceeding fifteen pounds with no limitation on size; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

12.<\/span> Pressure vessels that do not exceed:\n\t\t\ta. Five cubic feet in volume and 250 pounds per square inch gauge pressure;\n\t\t\tb. One and one-half cubic feet in volume and 600 pounds per square inch gauge pressure; and\n\t\t\tc. An inside diameter of six inches with no limitations on gauge pressure; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

13.<\/span> Pressure vessels used for transportation or storage of compressed gases when constructed in compliance with the specifications of the United States Department<\/span> of Transportation and when charged with gas marked, maintained, and periodically requalified for use, as required by appropriate regulations of the United States Department<\/span> of Transportation; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

14.<\/span> Stationary American Society of Mechanical Engineers (ASME) LP-Gas containers used exclusively in propane service with a capacity that does not exceed 2,000 gallons if the owner of the container or the owner’s servicing agent:\n\t\t\ta. Conducts an inspection of the container not less frequently than every five years, in which all visible parts of the container, including insulation or coating, structural attachments<\/span>, and vessel connections, are inspected for corrosion, distortion, cracking, evidence<\/span> of leakage, fire damage, or other condition indicating impairment;\n\t\t\tb. Maintains a record of the most recent inspection of the container conducted in accordance with subdivision a; and\n\t\t\tc. Makes the records required to be maintained in accordance with subdivision b available for inspection by the Commissioner<\/span>; <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

15.<\/span> Unfired pressure vessels used in and as a part of electric substations owned or operated by an electric utility, provided such electric substation is enclosed, locked, and inaccessible to the public; or <\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t

16.<\/span> Coil type hot water boilers<\/span> without any steam space where water flashes into steam when released through a manually operated nozzle, unless steam is generated within the coil or unless one of the following limitations is exceeded:\n\t\t\ta. Three-fourths inch diameter tubing or pipe size with no drums or headers attached;\n\t\t\tb. Nominal water containing capacity not exceeding six gallons; and\n\t\t\tc. Water temperature not exceeding 350° Fahrenheit. <\/i><\/a><\/p><\/section>","plain_text":" CODE OF VIRGINIA\n\nEXEMPTIONS (\u00a7 40.1-51.8)\n\nThe provisions of this article shall not apply to any of the following:\n\n1. Boilers or unfired pressure vessels owned or operated by the federal\ngovernment or any agency thereof;\n\n2. Boilers or fired or unfired pressure vessels used in or on the property of\nprivate residences or apartment houses of less than four apartments;\n\n3. Boilers of railroad companies maintained on railborne vehicles or those used\nto propel waterborne vessels;\n\n4. Hobby or model boilers as defined in § 40.1-51.19:1;\n\n5. Hot water supply boilers, water heaters, and unfired pressure vessels used as\nhot water supply storage tanks heated by steam or any other indirect means when\nthe following limitations are not exceeded:\n\t\t\ta. A heat input of 200,000 British thermal units per hour;\n\t\t\tb. A water temperature of 210° Fahrenheit;\n\t\t\tc. A water-containing capacity of 120 gallons;\n\n6. Unfired pressure vessels containing air only which are located on vehicles or\nvessels designed and used primarily for transporting passengers or freight;\n\n7. Unfired pressure vessels containing air only, installed on the right-of-way\nof railroads and used directly in the operation of trains;\n\n8. Unfired pressure vessels used for containing water under pressure when either\nof the following are not exceeded:\n\t\t\ta. A design pressure of 300 psi; or\n\t\t\tb. A design temperature of 210° Fahrenheit;\n\n9. Unfired pressure vessels containing water in combination with air pressure,\nthe compression of which serves only as a cushion, that do not exceed:\n\t\t\ta. A design pressure of 300 psi;\n\t\t\tb. A design temperature of 210° Fahrenheit; or\n\t\t\tc. A water-containing capacity of 120 gallons;\n\n10. Unfired pressure vessels containing air only, providing the volume does not\nexceed eight cubic feet nor the operating pressure is not greater than 175\npounds;\n\n11. Unfired pressure vessels having an operating pressure not exceeding fifteen\npounds with no limitation on size;\n\n12. Pressure vessels that do not exceed:\n\t\t\ta. Five cubic feet in volume and 250 pounds per square inch gauge pressure;\n\t\t\tb. One and one-half cubic feet in volume and 600 pounds per square inch gauge\npressure; and\n\t\t\tc. An inside diameter of six inches with no limitations on gauge pressure;\n\n13. Pressure vessels used for transportation or storage of compressed gases when\nconstructed in compliance with the specifications of the United States\nDepartment of Transportation and when charged with gas marked, maintained, and\nperiodically requalified for use, as required by appropriate regulations of the\nUnited States Department of Transportation;\n\n14. Stationary American Society of Mechanical Engineers (ASME) LP-Gas containers\nused exclusively in propane service with a capacity that does not exceed 2,000\ngallons if the owner of the container or the owner’s servicing agent:\n\t\t\ta. Conducts an inspection of the container not less frequently than every\nfive years, in which all visible parts of the container, including insulation or\ncoating, structural attachments, and vessel connections, are inspected for\ncorrosion, distortion, cracking, evidence of leakage, fire damage, or other\ncondition indicating impairment;\n\t\t\tb. Maintains a record of the most recent inspection of the container\nconducted in accordance with subdivision a; and\n\t\t\tc. Makes the records required to be maintained in accordance with subdivision\nb available for inspection by the Commissioner;\n\n15. Unfired pressure vessels used in and as a part of electric substations owned\nor operated by an electric utility, provided such electric substation is\nenclosed, locked, and inaccessible to the public; or\n\n16. Coil type hot water boilers without any steam space where water flashes into\nsteam when released through a manually operated nozzle, unless steam is\ngenerated within the coil or unless one of the following limitations is\nexceeded:\n\t\t\ta. Three-fourths inch diameter tubing or pipe size with no drums or headers\nattached;\n\t\t\tb. Nominal water containing capacity not exceeding six gallons; and\n\t\t\tc. Water temperature not exceeding 350° Fahrenheit.\n\nHISTORY: 1972, c. 237; 1977, c. 301; 1978, c. 355; 1986, c. 211; 1988, c. 289;\n1990, c. 226; 1993, c. 543; 1999, c. 335; 2000, c. 898; 2012, c. 332; 2013, c.\n171.","edition":{"id":1,"name":"2025","slug":"2025","date_created":"2026-06-21 22:39:22","date_modified":"2026-06-21 22:39:22","current":1,"order_by":1,"last_import":null}}