Cast iron pipes have a long-standing tradition of use due to their non-corrosion properties, which means they can last for years if properly maintained.
However, they can become outdated and need replacing eventually. Fortunately, there are several ways to connect PVC pipe to cast iron pipe that will enable you to avoid having to replace the entire system.
Use a Wye
When connecting a cast iron pipe to a wye, it is essential that you use the correct fitting. Doing so can cause turbulent flow which could lead to clogs or vacuums in your air supply system.
Sanitary tees and wyes are both drainage fittings that transport waste from a vertical drain to an horizontal one, but they have different applications.
Sanitary tees feature three holes: one at the top and two at the ends. Water or wastewater can pass through these openings on top, and you may also use it to secure pipes that divert waste away from the main line.
By contrast, a wye has two openings on either side of its Y-shaped branch, making it much harder to fit into tight places; you may need to cut one in order for your piece of hardware to fit.
That is why wyes are sometimes referred to as “lowercase Ys.” Wyes have a slight bend, which reduces turbulence and prevents clogs in vertical drains such as sinks or toilets. Thus, they make perfect tools for moving waste from one vertical outlet to another vertical one.
When attaching a wye to a pipe, it can be made of any material including stainless steel and PVC. Welded construction also eliminates the worry about your pipe breaking during transit.
If you’re working with cast iron pipe, attach it to the wye using either a clamp or no-hub coupling. Then run water through it to see if any damage or cracking has occurred; if so, plumber’s epoxy can be used to repair the problem.
Installing a wye is usually possible by hand, but if the pipe is too wide or long it may require using a power tool. Be sure to use the correct tools and protect your hands from being exposed to heat from the tool when doing so.
Wyes are expensive plumbing fixtures, so it’s essential to know how to install them correctly. Doing so will guarantee your wye works correctly and won’t break down. If you’re uncertain of your abilities, hiring a professional plumber could help save any unnecessary expenses and time in the future.
Use a No-Hub Coupling
Cast iron pipe is a common element in plumbing systems across residential and commercial buildings due to its durability, incombustibility (unlike plastic piping), and suitability for connecting vertical pipes.
No-Hub Couplings are a type of coupling that utilizes a patented shield design to optimize pressure transfer from clamps to gasket and pipe. This seal creates an airtight connection, preventing pipes from pulling away from their coupling.
A no-hub coupling’s shield is designed to accommodate variations in pipe diameters, keeping them aligned and preventing any potential cuts or breaks to the inner gasket.
These are an ideal solution for connecting larger diameter cast iron piping to ABS or PVC schedule 40 piping. However, they cannot accommodate smaller cast iron pipe diameters.
When connecting a no-hub coupling to cast iron pipe, it is essential that the pipe receives adequate support on every floor and at its base. You can accomplish this by using stakes or braces as necessary.
You can also place riser clamps on the end of the pipe to help it “straddle” itself into an upright position. Doing this helps prevent slippage over time and makes connecting a no-hub coupling easier.
Once your cast iron pipe has been securely connected to its no-hub coupling, you can begin installing them in your home or commercial building. After finishing installation, be sure to test the new pipes and connect them to your existing system.
Though many people think cast iron piping is only for residential homes, it is actually an incredibly versatile and long-lasting piping option that can be utilized in commercial buildings. It’s commonly found in hospitals, hotels, office buildings, vehicle dealerships and other establishments due to its lower flammability compared to PVC or ABS piping.
Use a Gasket or Adhesive
When connecting a cast iron pipe, it is essential to use the appropriate materials and tools. Doing so will guarantee a secure connection and help avoid leaks in your system.
Before beginning, ensure the surface of the PVC is clean and free of debris. Next, apply generous amounts of PVC adhesive to both pieces – PVC and cast iron – then press them firmly together for several minutes until the glue sets.
Once you have done this, use a transition coupling to connect the pipe. This type of coupling consists of an adaptable rubber sleeve encased in metal and band clamps that can accommodate various pipe types and sizes.
Transition couplings come in a range of sizes and can be purchased at most home improvement stores. Once you have connected the pipes, tighten the couplings with a nut driver to secure the joint and prevent leaks.
Another way to connect a PVC pipe to cast iron pipe is by using a compression gasket. Compression gaskets are commonly used when joining cast iron soil pipe that has both bell and spigot (hub pipe).
To start, insert the bell end of one pipe into the spigot end of another. Next, line up both pipes and their gasket so they fit tightly together. Doing this allows the gasket to expand and create an airtight seal around the second pipe.
Once the connection has been made, it’s essential to lubricate the joint with an appropriate lubricant. Doing so will improve sealing and help avoid long-term issues with the joint.
A common lubricant for compression gaskets is soapy water. However, it’s also possible to lubricate the joint with an approved pipe lubricant. No matter which option you select, make sure you follow all manufacturer’s instructions and recommendations when using a compression gasket.
Cast iron repair is not only a straightforward project that takes minimal time and effort to complete, but it doesn’t require expert plumbing skills either. Plus, you’ll save money by doing the work yourself instead of hiring an experienced plumber.
Use a Caulk Joint
Cast iron pipe is a heavy and sturdy material that can withstand considerable pressure. This explains why it is still commonly used in homes to connect sewers and water pipes.
Pipe joints can be intricate, but caulking is an effective solution. Although this process takes some time and requires special tools, the results are strong and long-lasting connections that won’t need replacement in a few years.
Caulk joint is a plastic-like product used to fill gaps and cracks between stationary building materials. It’s an effective way to prevent leaks from forming and keep your home and its contents secure.
First, ensure the ends of your cast iron pipe are clean and dry. Additionally, wearing eye protection or other protective gear while performing this task is recommended.
Next, you’ll want to orient the end of your cast iron pipe so it aligns with the hub of another tube. To do this, use a tool known as a yarning iron (see Figs 25 and 28 below).
Once all ends are lined up correctly, pack twisted oakum into the joint until it reaches 1″ from the top of the bell. This will create a seal between your cast iron pipe and bell.
When connecting pipes, there are a few methods for caulking the joint. One popular option is using rope-like caulking compound which you can purchase in bulk at most hardware stores.
Once the compound has been worked into the pipe, use a hammer and caulking iron to compact it further. Repeat this process several inches at a time until all of your pipe ends are in joint.
This method may not be as eco-friendly as using hot-caulking compound, but it’s an effective way to seal your cast iron pipe. Just remember to wear a mask and shield your hands from any dust that may fall out of the melted lead as it cools.
Another method for connecting a caulk joint is to use something called a joint-runner, which can be made out of asbestos rope or another fireproof substitute. It wraps around the pipe just above the hub and fastens securely in place. After pouring molten lead into the joint until it matches up with its top, this method works great!