The BTU rating will be different, of course, for propane. 54 gas orifice is equivalent to a 0.055 inches H2O and provides 7680 input btu of natural gas. The number on a gas spud is equivalent to a drill size that also can be expressed in decimal inches and that also translates into a pressure rating in inches of water or a BTU rate in natural gas or LP gas - propane.Įxample: a No. Rheem conversion instructions - Natural Gas to LP Gas, citation below What do the Numbers Mean on Gas Spuds or Orifices? The qualified agency performing this work assumes responsibility for this conversion. Installation must conform with local codes, or in their absence, with the latest edition of the National Fuel Gas Code, ANSI Z223.1.įailure to follow instructions could result in serious injury or property damage. This conversion kit must be installed by a qualified installer or service technician in accordance with these instructions. The installation is not proper and complete until the operation of the converted appliance is checked as specified in the manufacturer’s instructions supplied with the kit. The qualified service agency is responsible for the proper installation of this kit. If the information in these instructions is not followed exactly, a fire, explosion, or production of carbon monoxide may result, causing property damage, personal injury, or loss of life. This conversion kit shall be installed by a qualified service agency in accordance with the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction. Here are two typical manufacturer's gas conversion kit warning notices Watch out: Converting a gas appliance is dangerous if not done correctly and in accordance with the manufacturer's instructions. When converting an appliance from using a lower pressure natural gas fuel supply to a higher pressure LP or propane gas fuel supply, the new orifices will be smaller in diameter to accommodate the higher pressure of the fuel supply without releasing too much fuel too quickly. This means that you will need to change the orifice fittings to match the fuel you intend to use. The orifice diameter of these tiny little parts is different between natural gas and propane or LP gas. Gas flow rate, a combination of supply pressure and orifice diameter, determines the quantity of gas available at the individual burner and thus sets its BTU output rate or range. The technician should be sure to correctly identify the model number of your gas appliance so that s/he can follow the correct details of the manufacturer's instructions.įor most gas cooktops a threaded brass orifice or "spud" is used to meter gas at the proper flow rate at each burner. Watch out: Most manufacturers require that installation and fuel conversions shall be performed by a trained and qualified service technician. How to Change the Gas Orifices (Spuds) at Cooktop Burners to Convert between Natural Gas & LP Gas - Example We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. gas range, gas water heater, gas furnace, gas incinerator toilet) at higher altitudes, adjustments to the gas burner's metering orifices, regulator, combustion air, and even venting will usually be needed for safe use. When using a natural gas or propane-burning appliance of any type (e.g. Watch out: gas appliance adjustments are needed not just when changing between LP or propane and natural gas but also at high altitudes. This article series explains the procedure for converting from LP gas or "bottled gas" to natural gas or "piped in gas" at a building. How to remove the old and install the new properly-sized gas metering orifices or "gas spuds" at a gas fired appliance when converting between natural gas and propane or LPG. LP to Natural Gas appliance orifice or spud conversions or Natural Gas to LP fuel conversion procedures. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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