Capacity pipes through their joints is a matter that must face not only the professionals who build and service pipelines. Many homebrew, rural residents, gardeners-gardeners are forced to do such work: one for some designs, others — for various buildings, and some for water.
Classic connection pipes — welded, and threaded, socket weld, most commonly used by professionals, are often impossible to perform in country conditions or in the farmhouse — there is no welding machine or rolling-threaded tool. If you need to build a watering system, such unfortunates can still use the same archaic method — the ends of pipes to connect lengths of suitable rubber hose, cementing their wire twisting. And to ensure, for example, hand watering from a household pump or low pressure trunk, these pipe connections are quite reasonable. For systems of high pressure (not to mention the use of such tubes in the power structures), they are not suitable. You have to look for other more reliable ways of connections realized in the same conditions.
And there are such options. They are a bit more complicated than connecting pipes hoses, but they can be implemented, having at hand the most common locksmith tools: hacksaw, drill with the appropriate drill bit and a file.