How to Connect Galvanized Pipe Without Threads: 6 Easy Steps

Galvanized pipes may sometimes come without threads, making it tricky to connect them. That means you cannot simply thread two pipes together to seal them.

But that doesn’t mean it’s impossible to connect them? You can take several approaches on how to connect unthreaded galvanized pipes.

You can try to thread the pipe or use pipe thread tape to create a bond between the two pipes. Another alternative would involve welding the pipes or connecting them using coupling.

The post takes you through a step-by-step guide on how to connect galvanized pipe without threads.

Step By Step Method To Connect Galvanized Pipe Without Threads

Step By Step Method To Connect Galvanized Pipe Without Threads

To connect non-threaded galvanized pipes, you need a coupling that firmly seals the joint. Therefore, you need to have a suitable coupling to ensure the pipes never leak.

Galvanized pipes have a zinc coating and rough surface that may prove tricky when connecting two pipes. Here is how to connect an unthreaded galvanized steel pipe.

Tools You’ll Need:

  • Hacksaw
  • Measuring tape
  • Putty knife
  • Wrench

Let’s Start…

Step 1: Determining the Pipe’s Diameter

Measure each pipe’s outer diameter using a tape measure. Pick a standard coupling if the diameters of the two pipes match. In case of differences in diameter, choose stepped coupling.

Step 2: Determine How Smooth the Pipes are

Check the galvanized surfaces of the pipes and determine whether they have a rough or smooth coating. There are 2 galvanized coupling types you can use – one for a rough surface and another for a smooth one. If the surface is rough, choose a more textured coupling.

Step 3: Check How Square the Pipe is

Use a carpenter’s level on one end of the non-threaded pipe to check how square it is. Cut it using a hacksaw to level it out if it isn’t. Once you’re through, use a metal sander to remove any rough edges from the pipe.

Step 4: Clean the Galvanized Pipe

Use a water-based degreaser and a pipe to clean galvanized pipe. This helps remove stains and dirt from the coupling area. Put the pipe ends together, centering the coupling to the pipe joint. Use a pencil to mark a line on each pipe where the coupling ends.

Step 5: Insert Unthreaded Galvanized Pipes

Take one end of non-threaded pipes and insert it into the coupling. Make sure you align the end of the coupling to the line you’d drawn in Step 4 above. Insert the other pipe into the coupling, centering the coupling between the two lines you’d drawn earlier.

Step 6: Fasten Tightening Bolts

Lastly, tighten those fastening bolts until you have the coupling holding tightly to the galvanized pipes. With the help of a torque wrench, evenly fasten all these bolts at the coupling marked torque specification until you hear the wrench click.

Different Methods of Threadless Connections

The methods of threadless connections fall into two main categories – welding methods and non-welding methods. Welding methods include fusion and pressure welding, which are ideal for thicker galvanized pipes.

Non-welding methods for connecting non-threaded galvanized steel include coupling (this is the process we have just discussed above), flange connection, tension connection, and Gebo fitting.

Things to Consider When Connecting Non-Threaded Galvanized Pipe

Things to Consider When Connecting Non-Threaded Galvanized Pipe

Connecting an ungraded galvanized pipe is a process that requires you to bear in mind some important considerations. The following are the factors to pay attention to as you join galvanized pipe without threads:

Pipe Diameter

The pipe diameter is critical because it determines the kind of coupling you can use. If the two pipes have the same 3/4 galvanized diameter or any other common pipe size, use a standard coupling. However, if one pipe has a bigger diameter than the other, you’ll need a stepped coupling.

The Texture of Galvanized Surface

The surfaces of galvanized steel pipes can be smooth or rough. The texture of the coupling should match that of the pipes. Rough pipes work well with rough coupling, while smooth pipes go with smooth coupling.

Squareness of Pipe ends

The squareness of a pipe means the ends to form the joint should be appropriately aligned to connect the pipe seamlessly and without leaving a gap. If this isn’t the case, then we advise you to cut the pipes with a hacksaw to align them properly.

Method of Connection

Another critical consideration is the method you intend to use for the connection. You can either choose the welding or non-welding techniques we have just outlined above, depending on the one that works in your situation.

Frequently Asked Questions

galvanized water pipe

1. How do you plug in a galvanized water pipe?

You can plug a galvanized pipe either temporarily or permanently. To make a temporary plug, you need galvanized pipe fittings such as a plastic cap to secure the pipes. You can also attach the metal cap. If you want permanent results, simply solder the end of the pipe you intend to cap.

2. How do you fix a broken galvanized pipe?

Fixing a broken galvanized pipe is easy and only requires replacing the damaged section. That means that you can create two joints to connect the pipe using your favorite method.

3. Do compression fittings work on a galvanized pipe?

Yes. Compression fittings such as dresser coupling work on galvanized pipe. They connect the pipe regardless of whether it is threaded.

4. How do you connect galvanized pipe to copper pipe?

You can connect a galvanized pipe to a copper pipe through soldering. Once you have created a good joint, smoothen it out with sandpaper.

Final thoughts

Now that you know how to connect galvanized pipe without threads, it should be easier for you to deal with any plumbing emergencies in your home.

There are various ways you can do it, including welding and non-welding methods. This means you can pick a method that works best for you while giving you effective results.

Using couplers is the most common method used by homeowners. We have already outlined a step-by-step guide above on how to do it.

After reading this guide, we have no doubt you’ll have an easy time forming a secure seal between those non-threaded galvanized pipes.

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