[TX MECH PLUMBER]

Finally.... I was taught the same thing except using two framing squares. no measuring, marking or math equations needed.

What if its 10 in pipe 10 ft in the air in a mech room with a big piece of duct in the way ?? Tricks are great but the math is always rite and always works !!'

 

[U666A]

Finally.... I was taught the same thing except using two framing squares. no measuring, marking or math equations needed.

What if its 10 in pipe 10 ft in the air in a mech room with a big piece of duct in the way ?? Tricks are great but the math is always rite and always works !!'

Tex mex, either way you need to come up with 2 measurements; a horizontal offset and a vertical offset.

The trick with the framing squares works, you can do it with just one if you can simplify the numbers enough to make it work.

Good call.

 

[Rando]

What if its 10 in pipe 10 ft in the air in a mech room with a big piece of duct in the way ?? Tricks are great but the math is always rite and always works !!'

you don't hold them up in the air where the pipe is!! :laughing:

You are still using the math, the framing squares or marking the numbers down like the other guy said just puts the equation on a surface where you can visualize it without doing the formula.

 

[rjbphd]

you don't hold them up in the air where the pipe is!! :laughing:

You are still using the math, the framing squares or marking the numbers down like the other guy said just puts the equation on a surface where you can visualize it without doing the formula.

That's when I use my laser folding ruler.

 

[TX MECH PLUMBER]

Tex mex, either way you need to come up with 2 measurements; a horizontal offset and a vertical offset.

The trick with the framing squares works, you can do it with just one if you can simplify the numbers enough to make it work.

Good call.

True but if you can measure for c2. Instead of using the formula to find it then its faster. I understand Thers two of sets but if you measure on a flat plane center pipe to center pipe you at removing one of those offsets from the equation just a short cut. Think about it. It works !!

 

[U666A]

True but if you can measure for c2. Instead of using the formula to find it then its faster. I understand Thers two of sets but if you measure on a flat plane center pipe to center pipe you at removing one of those offsets from the equation just a short cut. Think about it. It works !!

I am thinking about it... I'm thinking I can't make any sense of that post.
:laughing:

Can you explain that again?

 

[TX MECH PLUMBER]

Ok. When you use this formula you are finding what the distance is from center of one pipe to the center of the other pipe. You use the horizontal distance (a) and the vertical distance (b) in the formula a2+b2=c2 to find the distance (c). (C) is the distance of the two pipes on a flat plain you then use (c)x1.414= travel piece ( of course subtracting the take off for the 45s ) and then you have you cut length of your travel piece.
In a square room with level floors (or a laser) this is the best way even more so when working with large pipe and when ther are obstructions in the way. By measuring off the floor and walls ect ect ect you can always find (a) and (b)

But: for example when running pipe in a ditch and it would be difficult to find (a) and (b) ( not impossible ) its much faster to just measure for (c). I will lay in the pipe that will be down stream (dwv system ) from the rolling offset and run the pipe up stream offset wild ( extra long) so that the pipes are over lapping each other or use a 4' level , straight edge , ect ect to get the measurement (c) With copper. Steel c900 ect ect ( large or expensive pipe ) il dry fit a coupling on and put a piece off scrap pipe in. Basically any method to make the pipes over lap or any way to measure the distance on one plain center to center of course ( when in a ditch il measure top to top wich is the same as center to center and is more accurate then trying to eyeball center on both pipes ) after you get that measurement you use the 1.414 and ect ect ect.

To put it simple If I can I measure to find (c) !!!!! I was never taught the a2 b2 formula except in geometry class in high school. I did know it was used in plumbing but I was taught the way I described by a retired state inspector/ UA union trade school instructor (Austin tx area) however I am very happy to know now how to use the square formula and know I wish I knew it in the past and will use it but if you can take one measurement (c) isn't that better then taking two (a) and (b) ,, not counting the measurements that you mite have to take to get just to figure (a) and (b) ?????

Thanks to all the zoners that have useful input on this and all threads!! And even more so KTS posts on this thread. It was very helpful to learn how to use the square formula !!!!

 

[TX MECH PLUMBER]

Of course most here know all posted above just trying to explain a short cut by removing one of the offsets in a rolling offset . or how I was taught at least

 

[Plumberman911]

That's interesting. I'm lost I need to try it and see. I kinda get the since of it. I'd really like to get it down. Sometimes it would help on a ground if you have to offset to get under a stem.

 

[sparky]

Worked for a guy who said he fired his leed plumber for trying to hold up 2, 4 inch no hub 1/8 bends and measure between them at the same time. AND was on a ladder.

You can lay them out on the ground and get the same measuremen,just have to have something square to measure off of

 

[Tango]

Worked for a guy who said he fired his leed plumber for trying to hold up 2, 4 inch no hub 1/8 bends and measure between them at the same time. AND was on a ladder.

You can lay them out on the ground and get the same measuremen,just have to have something square to measure off of

Reviving an 8 year old dead thread, Ok sure why not.

I also worked in a sports complex building an Olympic size swimming pool and this 4th year apprentice (4th year for over 20 years who couldn't pass the exam) had a helper and both had 12" or 14" PVC 45s try to measure in between in free floating air on step ladders. He didn't know the regular offset and a rolling was alien space technology! Those fittings were around 2200$ each and had to be manufactured one at a time on a special order. I went there to calculate but the foreman came over to give me $hit because I wasn't at my post. Dumba$$es!

 

[sparky]

Reviving an 8 year old dead thread, Ok sure why not.

I also worked in a sports complex building an Olympic size swimming pool and this 4th year apprentice (4th year for over 20 years who couldn't pass the exam) had a helper and both had 12" or 14" PVC 45s try to measure in between in free floating air on step ladders. He didn't know the regular offset and a rolling was alien space technology! Those fittings were around 2200$ each and had to be manufactured one at a time on a special order. I went there to calculate but the foreman came over to give me $hit because I wasn't at my post. Dumba$$es!

Be glad he saved you from screwing them up lolololol