How to improve the sealing performance of pipe thread connections

Provided that the strength is maintained, air leakage is usually caused by a lack of sealing filler. It is possible to increase the amount of filler used, such as PTFE tape, thread-sealing glue, or better materials like Formula 8

Firstly, improved thread precision is beneficial for sealing. If the precision is sufficient for threaded connections, considering using an adhesive for sealing is an option

If the above methods fail, welding can be considered

It’s better to use sealing tape; generally, the pressure in areas where threaded connections are used isn’t very high. If they are welded together directly, the advantage of threaded connections, which allows for easy disassembly, is lost

Improve the precision of the threads. Seal with adhesive; wrap with a filler such as PTFE tape.

Take your threads to the factory for processing so that they can be fitted directly. Additionally, you might want to try using PTFE tape or soft PTFE

If possible, considering a structure with a WSS thermometer connector could also be an option, using threads plus gaskets for sealing.

Generally, using sealing tape is sufficient to prevent air leaks

There are several common methods for using sealing fillers in the threaded connection of galvanized steel pipes. The first method involves applying lead grease evenly onto the outer threads, then winding hemp fibers around them in a clockwise direction in an even manner, and finally screwing on the inner threaded fittings and connectors. This is an old method that has been in use for decades; it’s a bit crude, but it is very effective. The second method involves winding raw tape around the external thread 5–7 times in a clockwise direction (but this approach can sometimes lead to leaks), and the exposed part of the joint is prone to rusting. If you want excellent sealing performance, I recommend using pipe thread sealant. When this sealant comes into contact with air, it remains in a liquid state. By applying it to the threads to form a seal, a curing reaction takes place inside the metal threads due to lack of oxygen and under the catalysis of metal ions; this reaction fills the entire thread gap, resulting in a thermosetting plastic that offers high strength, corrosion resistance, tolerance to certain temperatures (150–204°C), aging resistance, and extremely strong sealing properties. It can completely replace the outdated sealing techniques currently in use in our country, such as traditional hemp fiber and PTFE tape. But it also has a drawback: it has a certain shelf life, especially since it should be used up as soon as it is opened

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