PURPOSE: This rule sets out minimum general standards governing the utilization of liquefied petroleum gas in mobile homes. These changes will help insure the safety of public and property. PUBLISHER'S NOTE: The publication of the full text of the material that the adopting agency has incorporated by reference in this rule would be unduly cumbersome or expensive. Therefore, the full text of that material will be made available to any interested person at both the Office of the Secretary of State and the office of the adopting agency, pursuant to section 536.031.4, RSMo. Such material will be provided at the cost established by state law.

1. (1) All liquefied petroleum gas (LPG) gas supply and fuel burning equipment shall meet the requirements as contained in 2 CSR 90- 10.020(2) and 2 CSR 90-10.040(2) and sections (2)–(38).
2. (2) Mobile units for human habitation and containing or utilizing equipment for LPG use or equipment readily convertible to LPG use shall not be used in this state or connected for use to any liquefied petroleum gas supply system or LPG container which contains LPG fuel unless that equipment and the gas supply system is installed, inspected or tested by a registrant or a person in the hire of a registrant, in compliance with National Fire Protection Association (NFPA) Standard Numbers 501A, 54 and 58 and Chapter 323, RSMo and all corresponding rules. This rule does not apply to recreational-type vehicles traveling the public roadways in the state and connected to LPG containers constructed under Interstate Commerce Commission specifications or United States Department of Transportation regulations as a supply for fuel serving the burning, heating or illuminating equipment in or on the occupied space of the vehicle.
3. (3) It shall be the duty of the manufacturer of the new mobile unit or authorized agents making the installation of the gas equipment to comply with the standards in effect at the time of manufacture.
4. (4) The inspection authority shall require certification from the manufacturer or authorized agents that each mobile unit containing the LPG equipment or equipment readily convertible to LPG use is, at the time of manufacture, in compliance with these standards. A copy of this certification shall be furnished with each manufactured mobile unit and be made available to the owner, the connecting gas supplier and the inspection authority.

5. (5) Any section of a movable or portable dwelling or portion designed for human occupancy, with or without a permanent foundation containing all or part of a system for use with LPG or readily convertible to LPG, shall provide a level of safety at least equal to that provided by nationally recognized standards of safety.

   1. (A) If any section has parts concealed in such a manner that inspection is impractical after fabrication, the manufacturer shall certify to the inspection authority that the part or section does comply with nationally recognized standards of safety.
   2. (B) When deemed necessary and a written request is made by the inspection authority, the manufacturer shall submit detailed plans of the prefabricated part or section for each model or series of the prefabricated part or section.
   3. (C) Failure to comply with these requirements shall be just causes for tagging the system to prohibit its use with LPG in Missouri.

6. (6) It shall be a violation for any person, firm, corporation or association to install, modify or alter, the burning, heating or illuminating equipment for using LPG in or on any new or used mobile unit, prefabricated unit, movable or portable dwelling designed for human occupancy, with or without a permanent foundation, containing all or part of an installation or system for use with LPG or readily convertible to LPG in a manner that the installation of equipment, piping or venting would not be in compliance with applicable nationally recognized standards of safety, including NFPA Standards Numbers 54 and 58 and referenced codes contained. These standards are adopted as rules at 2 CSR 90- 10.020 and 2 CSR 90-10.040.

   1. (A) No such installation, modification or alteration shall be made in a manner not in conformity with the manufacturer’s equipment listing with a nationally recognized testing agency or without the written approval of the inspection authority.
   2. (B) The inspection authority shall require satisfactory evidence or proof to substantiate claims regarding the safety of any alternative to nationally recognized standards.
7. (7) Only a holder of a registration permit issued by the inspection authority or a person in his/her employ shall connect any LPG container to the fuel system in or on a new or used mobile home or a prefabricated unit or a movable or portable dwelling designed for human occupancy.

8. (8) Each LPG installation shall be tested for leaks to determine that all parts of the installation are in a safe operating condition before placing the unit in service as it is initially connected for the first time and, also as it is connected for use after having been moved from one (1) location to another, regardless of the distance.

   1. (A) It is the responsibility of the owner to secure this inspection and test.
   2. (B) These restrictions on container systems shall not apply to the routine exchange of cylinders.
   3. (C) The registered installer and owner of the unit tested shall maintain a record indicating the date and results of the pressure test.
   4. (D) These restrictions on connection of containers or testing shall not apply to recreational type vehicles except where there is evidence that these requirements are necessary for the benefit of public safety.
9. (9) For the purpose of this rule, when the term equipment is used it shall be construed as including all burning, heating and illuminating appliances and their appurtenances.
10. (10) All LPG systems installed in or on mobile homes shall be of the vapor withdrawal type with a normal operating pressure of eleven inches (11") of water column (wc), unless otherwise specified by the appliance manufacturer.
11. (11) Flexible appliance connectors shall be listed and approved for LPG use.
12. (12) Quick-disconnect connectors shall not be used in LPG systems.
13. (13) LPG containers shall not be installed or stored inside any mobile home, except for listed, completely self-contained hand torches, lanterns or similar equipment with the containers having a maximum water capacity of not more than two and one-half pounds (2 1/2 lbs.) (approximately one pound (1 lb.) LPG capacity).
14. (14) LPG piping systems shall comply with the NFPA Manual Number 54, 1996 edition and NFPA Manual Number 58, 1995 edition.
15. (15) LPG storage containers shall comply with the 1989 edition of NFPA Manual Number 58.
16. (16) LPG storage containers and piping systems shall be sized to insure adequate capacity for all appliances at maximum demand.
17. (17) Piping, tubing or pipe or tubing joints shall not be installed within any wall, ceiling or floor space of the mobile home.
18. (18) Each mobile home shall have its gas supply connection identified by a permanently affixed label or tag at or near the gas supply connection.
19. (19) A shut-off valve shall be installed in the fuel piping at each appliance inside the mobile home upstream of the union or connector in addition to any valve on the appliance and so arranged to be accessible for servicing of the appliance and removal of its components. The shut-off valve shall be located within six feet (6') of a cooking appliance and within three feet (3') of any other appliance. A shut-off valve may serve more than one (1) appliance if located as required by this rule. Shut-off valves used in connection with gas piping shall be of a type designed and listed for use with LPG.
20. (20) All openings in the LPG piping system not connected to appliances shall be closed, gas tight, with threaded pipe plugs or pipe caps.
21. (21) Gas piping shall not be used for an electrical ground.
22. (22) Pipe couplings and unions shall be used to join sections of threaded piping. Right and left nipples or couplings shall not be used.
23. (23) All gas piping under mobile homes shall be adequately supported by galvanized or equivalently protected metal straps or hangers at intervals of not more than four feet (4'). Gas supply connections shall be rigidly anchored to a structural member within six inches (6") of the supply connection.
24. (24) Before appliances are connected, piping systems shall stand a pressure of at least six inches (6") mercury or three (3) pounds per square inch gauge (psig) or at the pressure recommended by the appliance manufacturer for a period of not less than ten (10) minutes without showing a drop in pressure.
25. (25) After appliances are connected, the piping system shall be pressurized to not less than ten inches (10") nor more than fourteen inches (14") water column and the appliance connections tested for leakage.
26. (26) Defective heat exchangers on appliances shall be replaced. Repair of any appliance heat exchanger is strictly prohibited.
27. (27) Heat-producing appliances and vents, roof jacks and chimneys necessary for their installation in mobile homes shall be listed or certified by a nationally recognized agency for use in mobile homes.
28. (28) Fuel-burning appliances shall not be converted from one (1) fuel to another fuel unless converted in accordance with the terms of their listing and the appliance manufacturer instructions.
29. (29) Each heating appliance shall be provided with a readily adjustable automatic control for regulation of living space temperature.
30. (30) All gas clothes dryers shall be exhausted to the outside of the mobile home by a moisture-lint exhaust duct and termination fitting and the stubbed-in gas supply line shall be provided with a shut-off valve, the outlet of which shall be closed with a threaded cap or plug when not connected to a gas dryer.
31. (31) Each LPG heat-producing appliance shall be listed and installed in conformance with its listing and manufacturer’s instructions.
32. (32) Heat-producing appliances shall be located so that no doors, drapes or other material can be placed or swing closer to the front of the appliance than the clearances specified by the manufacturer. Clearances surrounding heat-producing appliances shall not be less than specified by the appliance manufacturer and the appliance listing.
33. (33) The area surrounding heat-producing appliances installed in areas with interior or exterior access shall be framed in or guarded with noncombustible material so that the distance from the appliance to the framing material is not greater than three inches (3"). When clearance required by the listing is greater than three inches (3"), the guard or frame shall not be closer to the appliance than the distance provided in the listing.

34. (34) All fuel-burning appliances except ranges, ovens, illuminating appliances, clothes dryers, solid fuel burning fireplaces and solid fuel burning fireplace stoves shall be installed to provide for the complete separation of the combustion system from the interior atmosphere of the mobile home. An exception to this requirements may be allowed by the inspection authority if the heating appliance was manufactured for mobile home use, is not utilized for or replacing the primary heat source and is equipped with an oxygen depletion safety device which will prevent the oxygen level from dropping to a hazardous level. Combustion air inlets and flue gas outlets shall be listed or certified as components of the appliance. The required separation may be obtained by—

    1. (A) The installation of a direct vent system (sealed combustion system) appliances; or 2 CSR 90-10
    2. (B) The installation of appliances within enclosures so as to separate the appliance combustion system and venting system from the interior atmosphere of the mobile home. There shall not be any door, removable access panel or other opening into the enclosure from the inside of the mobile home. Any opening for ducts, piping, wiring, etc. shall be sealed.
35. (35) A forced-air LPG appliance and its return air system shall be designed and installed so that negative pressure created by the air circulating fan cannot affect its or another appliance’s combustion air supply or act to mix products of combustion with circulating air.
36. (36) Information on clearances, input rating, lighting and shutdown shall be attached to the appliances with the same permanence as the nameplate and located so that it is easily readable when the appliance is properly installed or shut down for transporting of the mobile home.
37. (37) Each fuel-burning appliance in each mobile home shall bear a permanent marking designating the type(s) of fuel for which it is listed.
38. (38) Every appliance shall be accessible for inspection, service, repair and replacement without removing permanent construction. Sufficient room shall be available to enable the operator to observe the burner, control and ignition means while starting the appliance.

AUTHORITY: section 323.020, RSMo 1994.* Original rule filed July 13, 1977, effective Nov. 11, 1977. Amended: Filed March 3, 1989, effective June 29, 1989. Amended: Filed Nov. 13, 1997, effective June 30, 1998.

*Original authority 1947, amended 1994.