Maya Ellison
Tapping into a plastic water main requires careful consideration of the tapping method to ensure successful project completion and long-term system service. The three most common methods are direct tapping, tapping saddles, and tapping sleeves. Direct tapping is the most cost-effective method, but it is not recommended for certain pipe classes. Tapping sleeves provide size and stability advantages but increase installation time and cost. Tapping saddles, like sleeves, increase material and installation costs. Wet tapping is another method that allows for the connection of a new service without interrupting the existing service. This process involves attaching a tapping machine with a cutting head and watertight housing to cut through the main and install a valve and tap without losing water pressure.
Characteristics and Values Table for Tapping a Plastic Water Main
| Characteristics | Values |
|---|---|
| Pipe Materials | Ductile iron, PVC, HDPE, Polyethylene |
| Tapping Methods | Wet tapping, Direct tapping, Tapping sleeves, Tapping Saddles |
| Tools and Materials | Tapping machine, Hand ratchet, Powered tap machine, Epoxy glue, Pipe cutters, Saw, Primer, Glue, Metal sleeves, Rubber liner, Compression coupling |
| Precautions | Turn off the water supply, Avoid pipe dewatering, Install backflow preventer, Use antisiphon control valves |
| Advantages | No interruption in service, Increased stability, Cost-effective, Secure connection |
| Disadvantages | Additional cost, Increased installation time, Risk of leaks, Temporary fixes |
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Wet tapping
There are two other methods of tapping water lines: Direct Tap and Tapping Saddle. Direct tapping is the most common and cost-effective method. However, it is not recommended for certain types of pipes, such as Pressure Class 100 pipes and AWWA C905 pipes. In these cases, tapping sleeves or saddles should be used.
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Tapping sleeves
However, there are also downsides to using tapping sleeves. They incur additional costs for the sleeve and increased installation time, which further elevates expenses. Tapping sleeves are one of the three methods of tapping water lines, the other two being direct tapping and tapping saddles. Direct tapping is the most common and cost-effective method. It can be performed on any diameter ductile iron pipe. However, it is not recommended for certain pipe types, such as Pressure Class 100 pipes and AWWA C905 pipes. In these cases, service clamps or saddles should be used.
When installing a tapping sleeve, it is crucial to consider the size of the tap. If the tap is too large, it can cause breakages. Size-on-size tapping sleeves are not allowed in many places due to concerns about their durability. However, if done well, they can function adequately. Overall, tapping sleeves provide a secure connection when properly installed but come with increased costs and installation time.
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Direct tapping
To attach to your main water supply line before it enters the house, first shut off the water before the point where you will be cutting. For an above-ground connection, remove a short section of pipe in the supply line, leaving just enough of a gap to slide on a slip tee. Install a nipple in the stem of the tee and attach a shutoff valve to it. Whenever you attach to a potable water system (like your indoor plumbing), always install a backflow preventer to prevent used water from flowing back into the water supply. If you are using antisiphon control valves, a preventer is built into each valve.
To tap into your existing cold-water supply system, you may prefer to hire a plumber. However, if you decide to tackle it yourself, be sure to turn off the water supply before you begin any work. In mild climates, you may tap into the water line at an outdoor faucet. In cold-winter climates, or if you don’t have adequate water flow at the faucet, you can cut into your main water line supply line. The easiest course of action is to make the connection at the pipe serving the faucet. With this method, you avoid cutting pipe when you tap into the water line. Turn off the house water supply and drain the faucet, then remove the faucet and install a brass or galvanized tee. After that, match the outlet sizes to the faucet pipe and the irrigation pipe you plan to use.
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Compression coupling
Compression fittings are ideal for water and gas applications within moderate temperature and pressure ranges. They are user-friendly, easy to install, and are composed of three parts: a valve, a sleeve, and a retainer nut.
Before installing a compression coupling, ensure that the pipe is free of any kinks, debris, or dirt. Use a clean paper towel or rag to clean the pipe thoroughly. If there are any stickers on the pipe, use a plumber's torch to heat the sticker for a few seconds, then apply flux to it. Wipe off any excess flux to prevent damage to the pipe. If there is a kink in the pipe, cut it a couple of inches before installing the compression coupling to avoid a leaky joint.
Once the pipe is ready, slip on the retainer nut, followed by the sleeve, and finally, the fitting. Ensure proper penetration to avoid leaks. To do this, hand-tighten the retainer nut, then use a wrench to give it an additional half to three-quarters of a turn. Be careful not to over-tighten, as this can damage the ferrule or tubing.
After installation, check for leaks by slowly turning on the water supply. If there is a slight weep, tighten the nut a bit more, but avoid applying excessive force. If the leak persists, disassemble the fitting, inspect for damage, and ensure the tubing is cut cleanly and properly deburred before reassembling.
It is important to periodically inspect and maintain compression fittings to ensure their continued performance and prevent potential issues. Regular maintenance includes visual inspections for signs of wear, corrosion, or damage, as well as checking the tightness of the compression nuts. Over time, temperature fluctuations and vibrations can cause fittings to loosen, so re-tightening the nuts may be necessary.
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Preventing leaks
First, it is essential to turn off the water supply before beginning any work. Shut off the water before the point where you plan to cut the pipe. This will reduce the risk of leaks and flooding during the tapping process.
When using push-fit joints, ensure that the rubber washer, plastic ring fitting, and pipe bracket are correctly aligned and seated outside the pipe. This three-part assembly plays a critical role in preventing leaks.
If you are gluing pipe sections together, use an appropriate primer and glue to ensure a tight seal. Clean the pipe surfaces before applying the primer and glue. For plastic pipes, use a suitable plastic pipe glue or cement. Allow sufficient drying and curing time for the glue to ensure a strong bond.
When connecting a tap to a PVC joint, ensure that the pipe is securely attached to one end of the joint before screwing the tap into the other end. This will create a secure connection and reduce the risk of leaks.
Consider using a tapping sleeve, which provides size and stability advantages. While it increases installation time and cost, the sleeve's hoop strength can exceed that of the pipe, making it a good option for PVC and HDPE pipes.
If you are working with polyethylene pipes, the recommended method is sidewall fusion. This process requires specialty tools, an AC power source, and specific weather conditions. Direct threading of polyethylene pipe is not recommended.
Always follow manufacturer instructions, and if you are unsure or uncomfortable with the process, consult a professional plumber. Taking the necessary precautions will help ensure a successful and leak-free connection to your plastic water main.
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Frequently asked questions
The process of tapping into a plastic water main involves connecting a new service to an existing pipe installation without interrupting the service. This can be done through wet tapping, which involves placing a tapping fitting on the water main and adding a valve to control the water flow. Alternatively, a tapping sleeve can be used to access and branch off an existing water main.
The benefits of using a tapping sleeve are increased size and stability. It is a good option when tapping PVC and HDPE pipes, as the sleeve's hoop strength may exceed that of the pipe.
The disadvantages of using a tapping sleeve include additional costs for the sleeve and increased installation time, which can elevate overall costs.
It is important to turn off the water supply before beginning any work. Additionally, when working with potable water systems, always install a backflow preventer to prevent used water from flowing back into the water supply.
