Which connection type is considered the most dependable for refrigerant piping?

The most dependable connection type for refrigerant piping is a welded joint. Welded joints create a permanent bond that ensures a tight and leak-proof connection. This is especially important in refrigerant systems, where even a small leak can lead to significant efficiency losses and potential system failures. The welding process creates a solid metal-to-metal junction that withstands the pressures and temperature changes encountered in refrigeration systems.

On the other hand, solder fittings can allow for some level of joint movement and may not provide the same level of durability under varying conditions. Flare fittings, while they do offer a tighter seal compared to other methods, still rely on the integrity of a threaded connection which can sometimes lead to leaks if not properly maintained. Compression fittings also depend on gasket or ferrule seals, which can degrade over time and may lead to refrigerant loss if not regularly checked. Thus, welded joints are favored for their strength and reliability in demanding applications like refrigerant piping.