richard you wanted to talk piping but but not water piping uh actually gas piping right gas should always be done by a licensed professional but i thought we'd take a few minutes today to talk about what goes into proper sizing safety what the pros have to know okay all right so it starts with sizing now gas comes in from the street if it's natural gas at a particular amount of pressure now by gas code you have to figure out what size pipe and they come in a variety right here so typically in a residential application you have might have inch and a quarter or one inch pipe coming in and now you look at the building and say all right what what's the size of the furnace and the water heater and the dryer right and now you have to have enough pipe size to support the load your the size of those appliances so they make all kinds of fittings so you put a t fitting in that would reduce and go to this first device now this pipe size can get smaller okay and so now you would reduce that to another down size smaller or you'd use a t fitting like this that there's all different variations besides so you end up building this tree so the furnace is going to use way more gas than say the stove will that's right but it's it's in this initial phase where the layout is so critically important because you need to have the right pipe size to all of them or they just won't function you'll have incomplete combustion you'll have a bad performance so the size is one calculation but then you have to get the gas to all the appliances and they can be spread all throughout the home right so what we're showing here is the use of steel pipe and this is a threaded steel pipe in the old days we used to have this machine i grew up on this machine cutting the pipe and putting a threader onto it and it removes pieces of steel to leave these clean beautiful threads right here well nowadays they have them all available in pre-cut lengths so you'd go to the supplies company and see there'd be an eight-footer a six foot or five four three down to about 18 inches would be the smallest in pipe that's in its length that's this one here right now once you get below 12 they come in a thing called nipples okay this is six inch down to one and a half inches and the other would be 12 down to six and so now let's say you're trying to run from this branch to let's say the elbow needs to go upstairs to the stove right here all right so i'll start with a shutoff valve right here on the branch good for each appliance absolutely shut off okay so now there's some dimension here and that's 21. so that's not any of these standard sizes so you got an 18 there yeah dude back in the day you could have just cut yourself a 21 incher but absolutely absolutely so now you come here and you you allow for that thread to go in this thing called a coupling right here so now you have to measure and allow for the thread to go into all of these fittings so looks like that would be two and a half let's call it two and a half is that it perfect okay so then you'd allow for that thread to be made into the fitting right here to make sure there's no leaks you'd use a pipe dope like this this thread sealant on every single fitting and you make them up with two wrenches now remember you have to start at the source and thread outward this way because it's always those righty tighty connections right so you work your way this way work your way way this way till you get to the appliance it's still a lot of connections though all throughout the house yeah it's gas right so you need it to be safe so what you do is you want to test it before you bring gas on so there's a shutoff valve you close it off and then they make a manometer a tester like this and so now you would pump up all the new work so pressurize the system and lock it on and watch it overnight or some long period of time and if there's no leak that will stay locked on right and as a double check you would actually use a soap solution to go around every single connection and if there was any can leak you'd see the air bubble belts and suspenders absolutely can't be too safe all right good information thank you richard thanks for watching this whole house has got a video for just about every home improvement project so be sure to check out the others and if you like what you see click on the subscribe button to make sure that you get our newest videos right in your feed