N.M. Admin. Code § 19.15.40.23
Current through Register Vol. 36, No. 1, January 14, 2025
Section 19.15.40.23 - MANUFACTURED HOMESA. Exterior gas piping. (1) Location of containers, containers and underground piping. (a) Containers, appurtenances and underground piping shall be installed in accordance with the currently adopted edition of NFPA 54 and NFPA 58.(b) Underground gas piping shall not be installed under any manufactured home or any attachments to the manufactured home. This is an exception to NFPA 54.(2) All gas piping beneath a manufactured home shall be adequately supported by galvanized, or equivalently protective metal straps or hangers at least every four (4) feet, except, where adequate support and protection is provided by structural members. (3) Gas shut-off valves shall not be placed beneath a manufactured home. (4) Any extensions or alterations made to the gas piping system for the purpose of establishing the supply inlet for connection to the riser may not reduce or restrict the gas piping size from that of the original inlet. (5) There shall be only one point of crossover between the section of a multi wide manufactured home, which must be readily accessible from the outside. (6) Unless otherwise approved by the bureau the connector used for the cross-over on multi wide manufactured homes when gas is supplied to more than one (1) section, must be made by a listed "quick disconnect" device which shall be designed to provide a positive seal of the supply side of the gas system when such device is separated. Refer to Exhibit #1. (7) The crossover connection shall be of the same size as the piping with which it directly connects. (8) The gas inlet on the manufactured home shall protrude no more than six (6) inches from the manufactured home. The inlet shall be rigidly anchored or strapped to a structural member within six (6) inches of the point where it enters beneath the manufactured home.(9) Bond of gas piping. (a) Gas piping shall not be used as an electrical ground.(b) Gas piping shall be bonded. Metallic gas piping shall be considered bonded if it is connected to the terminal on the chassis of the manufactured home by clamps, solderless connectors or by suitable ground-type straps.(10) Location of riser: The gas riser shall be located within twelve (12) inches of the manufactured home.(11) Site connector. Each manufactured home utilizing gas shall be connected to the manufactured home site outlet by an approved mobile home connector not more than thirty-six (36) inches in length. If encased flexible polyethylene pipe is used, a flexible connector shall not be required. The above ground portion of the polyethylene flexible riser shall not exceed thirty-six (36) inches in length and be installed so as to maintain flexibility and compensate for expansion and contraction.(12) Mechanical protection. All gas outlet risers, regulators, meters, valves or other exposed equipment shall be protected from mechanical damage by vehicles or other causes. Meters shall not be supported by gas service piping. Regulators may be supported by the rigid extended piping of the manufactured home.(13) Maximum pressure permitted. Gas supplied into the manufactured home shall not exceed 1/2 pounds per square inch gauge or fourteen (14) inches water column.(14) Gas pipe sizing. Gas piping systems shall be sized so that the pressure drop to any appliance inlet connection from any gas supply connections, when all appliances are in operation at maximum capacity, is no more than 0.5 inch water column. Conformance may be determined on the basis of test, or the gas piping system may be sized in accordance with the current National Fuel Gas Code, NFPA 54.B. Interior gas piping. (1) Interior gas piping shall be installed in accordance with the currently adopted edition of NFPA 54 and NFPA 58.(2) Gas -fired appliances. Each gas-fired appliance must have a listed shut-off valve located within three (3) feet of the appliance and located in the same room as the gas appliance.(3) Appliance connectors. Appliance connectors shall not exceed three (3) feet in length, except for range connectors, which shall not exceed six (6) feet in length.(4) Inspection testing and purging. Inspection testing and purging shall comply with the currently adopted edition of NFPA 54.C. Heat producing appliances. Every heat-producing appliance used in manufactured homes shall be listed or certified by an approved nationally recognized testing agency for this application. (1) Fuel conversion. Fuel burning appliances shall not be converted from one fuel to another unless converted in accordance with the terms of its listing.(2) Venting. Fuel burning, heating and refrigeration appliances shall be of the vented type and vented to the outside. In no case shall the vent of a gas-burning appliance terminate underneath the manufactured home. (a) Fuel burning heat-producing appliances, except ranges, gas dryers and ovens, shall have complete separation of the combustion system from the atmosphere of the manufactured home. Combustion air inlets and flue gas outlets shall be listed or certified as components of the appliance.(b) Vents, roof jacks and special fittings supplied as component parts of an appliance shall be installed in conformity with the terms of their listing. A single wall metal vent shall not be used unless it is a component part of a listed appliance.(c) Vent terminations shall not be less than three (3) feet from any motor driven air intake that opens into habitable areas.(d) Every joint of any vent or vent connector shall be secure, rigid, and tight, in alignment and have approved design and workmanship. Vent connectors shall be firmly attached to draft hood outlets or flue collars by sheet metal screws or other approved means, or the vent connectors using listed TYPE B or TYPE L gas vent materials shall be securely assembled using the method shown in the manufacturer's instructions.(3) Gas clothes dryers. (a) Clothes dryers shall not be installed in a room intended to be used for sleeping purposes.(b) Clothes dryers shall be exhausted to the outside air by a moisture lint exhaust duct and terminating fitting listed or certified as components of the appliance.(c) A clothes dryer moisture lint exhaust duct shall not be connected to any furnace duct, gas vent or chimney.(d) The moisture lint exhaust duct shall not terminate beneath the manufactured home.(e) Moisture lint exhaust ducts shall not be connected with sheet metal screws or other fastening devices, which extend into the duct.(4) Installation. The installation of each heat producing appliance shall conform to the terms of its listing as specified on the appliance and in the manufacturer's instructions. The installer shall leave the manufacturer's instructions attached to the appliance. Every appliance shall be secured in place to avoid displacement and movement from vibration and road shock. (a) Instructions. Instruction operating instructions shall be provided with the appliance.(b) Marking. Information on clearances, input ratings, lighting and shutdown shall be attached to the appliances with the same permanence as the nameplate, and so located that it is easily readable when the appliance is properly installed. Each fuel-burning appliance shall bear a permanent marking designating the type(s) of fuel for which it is listed.(c) Accessibility. 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.(5) Location. Heat producing appliances shall be so located that no doors, drapes or other such material can be placed or swung closer to the front of the appliance than the clearances specified on the labeled appliances.(6) Clearances. Clearances between heat producing appliances and adjacent surfaces shall not be less than specified in the terms of their listing. Clearance spaces shall be framed in or guarded to prevent creation of storage space within the clearance specified.D. Cross ventilation. (1) All manufactured homes shall have one (1) square foot of unrestricted venting area for every one hundred-fifty (150) square feet of enclosed floor space. Vents shall be uniformly distributed on the two(2) opposite long-walls. At least one vent shall be located within four (4) feet of each end wall. Vents shall be constructed and installed to exclude entry of vermin and water.
(3) This section shall not apply retroactive to existing installations that were in compliance with the codes in effect at the time of installation or approved prior to the effective date of this document.E. Manufactured home parks. (1) Fuel gas equipment and installation. Fuel gas equipment and installations installed within a building in a manufactured home park shall comply with the current standard for the Installation of Gas Appliances and Gas Piping (NFPA 54), or the current standard for the Storage and Handling of Liquefied Petroleum Gases (NFPA 58).(2) Manufactured home park gas systems. Gas equipment and installations within a manufactured home park shall be designed and constructed in accordance with the applicable codes adopted by the authority having jurisdiction. (a) Required gas supply. The minimum hourly volume of gas required at each manufactured home lot outlet or any section of the mobile home park has piping system shall be calculated as shown on Chart IV. CHART IV-Demand Factors for use in Calculating Gas Piping Systems in Manufactured Home Parks.
No Of Manufactured Home Sites | BTU Per Hour Per Mfg. Home Site |
1 | 125,000 |
2 | 117,000 |
3 | 104,000 |
4 | 96,000 |
5 | 92,000 |
6 | 87,000 |
7 | 83,000 |
8 | 81,000 |
9 | 79,000 |
10 | 77,000 |
11 to 20 | 66,000 |
21 to 30 | 62,000 |
31 to 40 | 58,000 |
41 to 60 | 55,000 |
Over 60 | 50,000 |
(b) Lot shut-off valve. On systems supplied from a central container, each manufactured home lot shall have an approved gas shut-off valve installed upstream of the mobile home lot gas outlet and located on the outlet riser at a height of not less than four (4) inches above grade. Such valve shall not be located under any manufactured home. Whenever the manufactured home lot outlet is not in use, the outlet shall be equipped with an approved cap or plug to prevent accidental discharge of gas.N.M. Admin. Code § 19.15.40.23
19.15.40.23 NMAC - Rp, 19.15.40.24 NMAC, 2-1-06