Plumbing thread: cutting and sealing

There are two options for assembling water supply: welding and thread. And even though the welding machine can be controlled faster, threaded connections also do not cease to be used. But the questions why and most importantly how this happens, we will answer in this article.

General provisions

The connection itself is carried out through the entry of the profile into the hollow, which are cut along the inner or outer surface of the walls of pipes and couplings in a spiral manner.

If welding is a relatively new method of joining elements of a metal pipeline, then the thread has been used for a very long time and managed to earn its reputation by time.

Merits

• Easy to use do-it-yourself. Thread tightening is a matter that can be done by anyone, even a person who is absolutely far from plumbing.
• The possibility of dismantling. To replace a failed element of the pipeline, it will be enough for you to unscrew it.
• High reliability. The junction is more difficult to destroy than any other part of the pipe.
• No need for expensive equipment. If the thread is already cut, then you generally only need one wrench, the price of which is relatively low.

• No damage to the zinc layer if present. Welding destroys zinc deposited on the surface of pipes.

• Neat appearance, not requiring additional processing.

disadvantages

• The need for additional sealing. Than to condense a carving on a water pipe we will consider further in more detail.
• The complexity of the process of cutting the threaded connection in case of its absence.

Cutting

If the pipes were purchased without thread, then it is necessary to create it. This will require certain tools:

Instruments

So, how to cut the thread on the water pipe? Let's get a look:

Tip: when working with the "grinder" be sure to wear safety glasses, as accidental contact of scale in the eye can lead to tragic consequences.

Progress

1. Measure out the required length of pipe and cut it off with a “grinder”.

Tip: it is desirable to pre-fasten a metal product in a vice, it will greatly facilitate the work with him.

1. Cut the chamfer from the edge of the pipe to facilitate its entry into the plate.
2. Lubricate the prepared edge with oil.
3. We bring the screw die with a suitable milling cutter strictly perpendicularly and begin cutting, holding the segment with a gas key.

1. After a few turns, we bring the tool back to free the processed place from the sawdust, and then we return to the task.
2. Having reached one centimeter, we remove the screw die and wipe the resulting thread from the oil.

Next, we will analyze what to seal the threaded connections of the water supply during the installation of the water supply itself.

Increased tightness

Sealing can be done by several methods:

FUM tape

The tape from a thin fluoroplastic film has the following advantages:

• Ease of use, which is justified by the presence of anti-friction qualities.

• High chemical resistance.
• Availability. Special store shelves are filled with this material.

Minuses:

• Insufficient level of adhesion with the material being processed. It is possible for the film to slip out of the joint as a result of the appearance of vibrations and when it is used in hot water supply systems.
• Low strength. Can be destroyed if there are coarse, threaded protrusions.
• Poor sealing of threaded connections of water pipelines with a thickness of more than 25 mm.

A strand of flax, lead and linseed minium

The time-tested method in which the linseed oil plays the role of a natural polymer, and lead protects the material from the appearance of corrosive processes.

Pros:

• The absence of the appearance and spread of rust.
• High sealing effect.
• Long service life with proper operation.

Minuses:

• The complexity of the acquisition of all ingredients, except for widespread flax.
• Complicated instructions for connecting elements and the process of the winding itself, which require special skills. The slightest mistake will entail a significant drop in the high performance of this compaction method.
• Low chemical resistance.

Linen strand without additives

Allows for the first time to seal the joint, but has a very low in comparison with other methods of compaction effect.

Non-Drying Sealants

It is a pasty substance of synthetic resins, oils and fillers.

Pros:

• Creates the effect of lubrication facilitating the process of twisting the connection of pipes and preventing jamming.
• Corrosion protection.
• Ease of use. It is enough to squeeze the contents of the tube to the desired area.

Minuses:

• Low reliability at high pressure, as the sealant is squeezed out of the joint.
• Low resistance to aggressive environments, including the presence of high temperatures, which reduce the level of sealing.

Conclusion

We looked at how to seal the threaded connections of the water supply, cut them, and what they actually are. Despite the widespread use of welding, this method of installation of the water supply system does not lose its relevance. It is noteworthy that you can do all the necessary work yourself.

The video in this article will provide you with additional information directly related to the stated topic. A well-assembled pipeline on threaded connections will serve you for a long time and efficiently.