These are just a few examples of the hundreds of transition fittings that are available. The gas line that runs between the tank and the structure housing the gas appliances is the service piping, also known as the yard line. In some places, it’s illegal to use galvanized pipe for gas because of the risk of zinc plating flaking off into the gas stream and clogging orifices. The photos here depict copper tubing installed underground in a state where copper tubing is approved for underground yard line installations. Some plumbing materials shouldn't be mixed, How to safely connect pipes of different styles, What you need to know to start your day with all the latest industry developments. This pipe extension usually is at least 3 inches long and is intended to catch any water or foreign material that may be in the gas before the material gets into the appliance itself. We will discuss some of the basics of inspecting gas piping. The reality is that, as long as you have the right tools and basic pipe fitting know-how, this is a very good do-it-yourself project. A detailed explanation on the causes, strategies for inspecting, and implications can be found in the ASHI@Home training program. In some jurisdictions, flexible connectors are allowed only for gas ranges, dryers, outdoor barbecues and other semi-portable appliances. To safely connect copper and galvanized steel, you have two options. To use the fitting, slip one end over the outside of the cast-iron pipe and the other end over the plastic pipe, then use a screwdriver to tighten down the clamps on either end. If you have poor soil drainage, use only copper. The piping inside the house is called the gas supply line or building line. The fittings are readily available in home centers, hardware stores and plumbing supply retailers. Luckily for all of us, these transitions are common enough that there are a number of fittings on the market that make dissimilar pipe connections quick, easy and safe. For these appliances, 6 feet generally is allowed. At the appliance connection point, there usually is a sediment trap or dirt pocket, sometimes called a drip leg that includes a nipple and a cap. We also have listed ten conditions that are typical when there are problems with gas piping. Three- or six-foot long and accessible: The flexible connectors can’t go through walls, floors or ceilings, nor can they be concealed. Consult a licensed propane company in your state for more information about approved underground gas piping and yard line requirements. Simply determine the type and size of the pipes you’re trying to connect, and your dealer can help you select the best type of fitting for the job. The inadvertent movement of the gas service line can cause leaks to form at the connections on either end of the line. Pipe dope is preferred and may be all that is allowed. I have taken many different training courses on many different subjects in the field that I am in now. Like underground propane tanks, buried piping and tubing must be made of a material that will resist harsh underground conditions. Depths range from 12 to 18 inches underground, depending on vehicular traffic. Like underground propane tanks, buried piping and tubing must be made of a material that will resist harsh underground conditions. We have oil heat now. The yard line is subject to depth requirements for the protection of the line and connections on either end. This is simply a gravity system, with the solids and liquids falling into the pocket. Although there are some exceptions, most appliances should have a shut-off valve adjacent to them. Copper tubing is not an approved underground piping material in some states. Propane gas lines running along the top of the ground (pictured here) constitute illegal installations. The two halves of the joint are then connected using a lock nut and two insulating washers that prevent the copper half from contacting the steel half. The propane yard line generally consists of copper tubing or plastic polyethylene piping. This question relates to the inside work only. There has to be a shut-off valve at the connection to the rigid piping. First, select a 2-inch ABS fitting with a male thread on one end and a female slip joint on the other, and screw the fitting into the existing steel pipe. I would recommend this program to anyone who wants to get into the field of home and property inspections. The branch line terminates in a drop line, which is a vertical pipe dropping down to the appliance from an overhead branch line. Running black iron pipe for propane use might seem like a daunting task, and you will pay a professional dearly to get the job done. The connection between plastic and metal is simply a matter of choosing a threaded fitting of the proper size and configuration to make the transition. Galvanized steel, copper, brass or CSST (Corrugated Stainless Steel Tubing) also can be used in some areas, but some utilities specifically prohibit the use of copper. Important Note About Underground Piping Materials - Allowable materials used for underground piping/tubing vary from state to state. Steel, copper, brass: The most common gas piping is black steel. In other areas, the use of copper is widespread. It might be a transition from threaded galvanized water pipes to copper pipes, or from old cast-iron sewer lines to today’s ABS. Only approved materials and fittings are to be used for any part of a propane gas service line. Re: Galvanized pipe OK with propane? The materials used for underground piping and tubing are subject to strict limitations. Author: hj (AZ) The original reason was that the gas composition caused the galvanizing to flake off and plug the orifices. The fittings cost under $10, and not only is the transition easier to accomplish, but it also leaves you with a joint in the line that can be disassembled later if you need to perform other work on the lines. Black iron pipe will be installed in my basement for a dryer, stove and possible future house heater and water heater. As a home inspector, it is your job to help identify deficiencies that can compromise the safety of occupants in homes using natural gas. Transition fittings are also commonly available to adapt ABS pipe to cast iron. Remodeling and repair questions? Check your local gas code to determine what is or isn’t allowed in your area. Don’t use pipe dope on these connections, as it can deteriorate the plastic. In other areas, the use of copper is widespread. So what’s the problem? The part of the yard line that is visible is where it comes out of the ground next to the tank and at the point it enters the building or where it connects to the point of use, such as a generator or pool heater. The materials used for underground piping and tubing are subject to strict limitations. I would have to say that this program was the best decision I ever made. Splicing or joining connectors with nipples often is prohibited. The problem is that the zinc used for galvanizing the threaded water pipes doesn’t get along very well with the copper. Steel piping typically is black with malleable iron or steel fittings. Gas piping can’t be run through chimneys or duct systems. Additional protective measures must be taken in certain cases like placing the gas line in a PVC sleeve or wrapping it with a protective tape. The piping downstream of the gas meter usually is the responsibility of the homeowner. When water flows through pipes of two different metals, the pipes will become eroded by electrical impulses from the slight acidity found in all water sources. Plastic pipe fittings are available as either threaded (both male and female threads are available) or slip (non-threaded for making glue joints). Underground there are … Ask whether you should report as a defect any piping installations with thread seal tape of any color. Bonding the gas piping to the electrical grounding system is a requirement, however, in many jurisdictions. If you’ve browsed through the plumbing section at the home center, you no doubt noticed that there are threaded copper pipe fittings that you can solder right onto the end of the pipe, and they will screw directly onto older threaded galvanized water lines. Branch lines run to individual appliances. If you’re doing any remodeling or repair work on the plumbing system of an older home, it’s a pretty safe bet that you’ll encounter the need to transition from an older type of pipe to a one of today’s newer materials. This program is extensive, detailed and the instructors are always there to help you out if you need it.”, Learn more about Carson Dunlop’s home inspection training program. Glue a 2-inch male x 1 1/2-inch female transition fitting into that, then glue in your 1 1/2-inch trap. You should know what is acceptable in your area. Carbon steel and wrought-iron pipe shall be at least of standard weight and shall comply with one of the following standards:1.ASME B36.10, 10M2.ASTM A 53/A53M; or3.ASTM A 106.403.4.3 Copper and brass.