Copper pipe used in home plumbing systems is joined by soldering. Soldering, or “sweating”, as plumbers call it, creates a watertight seal at the fitting between two pipe lengths. The basic steps are- flux is applied to the outside of the copper pipe and the inside of the fitting; the fitting and pipe are then assembled and heated with a soldering torch and the solder is applied to the joint. It’s called sweating because tiny sweat-like droplets of hydrochloric acid are formed on the surface of the copper pipe when it is heated.
Archives for October 2009
Cockroaches often make the list of the “nastiest bugs on the planet.” Largely considered nasty, dirty bugs found only in run-down places, they’re famous for how hard they are to kill. However, there’s a lot more to roaches than meet the eye.
Types of Cockroaches
Any gas appliance such as a water heater or furnace needs to transport the combustion gases safely out of the indoors environment. In order to make a vent, one of three types of pipe are typically used, Triple Wall, also called chimney pipe, Double Wall or Single Wall.
Triple Wall pipe, used mostly for chimneys, has an inner stainless steel liner and two outer liner walls made of either stainless or galvanized steel. It is almost never used for gas fired venting, being considered too expensive, and is reserved for coal, wood or oil burning appliances. However, it can act as a substitute for Type B (Double Wall) pipe if required.
Plumbing pipe made from galvanized or bare steel can be threaded to mate with other threaded pipe via fittings. Specialized tools are available for cutting and threading these materials, and should be used for these jobs. The exception is that steel pipe can be cut with a reciprocating saw or hacksaw, however, a tool called the Ferrous Pipe Cutter works best. Other tools for this job are a pipe vise, pipe reamer, ratchet threader, and a machine called a mule.
Copper pipe can be cut relatively simply with the proper tools. Copper plumbing pipe is joined through soldering, so the ends need to be perfectly round to get the best join, plus a nicely trimmed end will slide into fittings easier. That is why it pays to get the right tools if you will be working much with copper piping lines.