Plumber Math: Offsets Part 3 - Rolling Offsets Using 45 Degree Fittings 

Thank you so much. Watched so many videos and this one makes the most sense

From an apprentice Thank you you explained it In a way that clicked with me

Thank you for Morocco

Thanks for the video and the lesson, Tom. I have been plumbing for almost four decades and have been a Master Plumber since 1994. In the type of plumbing I have done over these years, I have never really needed to use this math. I have always gone with the “eyeball”, hit-or-miss-and-recut-if-necessary method, but I am finding myself more and more needing to use the math you are teaching - it saves money! With the rolling offset, I understand the math, but it would be great if you could do a hands-on demonstration to show how this really works in the field. It would be interesting to see how you subtract the amount from the center of the offset to the base of the hub/end of pipe, and it would also be nice to see and know what the actual roll of the fitting is, as mentioned in the comment above. Is there any chance of you being able to do this? Thanks!

Good morning, Tom! This is totally unrelated to this video. You are very good at explaining math, so I’m wondering if, one day, you could produce a video on the math involved with hanging pipe - particularly with clevis hangers anchored into a concrete floor above - Unistrut not being an option. I know there are “cheat sheets” out there, but if you have a method that you use or recommend, it would be very interesting and helpful to see that method and math explained. My brain gets to the overload point sometimes when I am trying to calculate hanger heights, rod lengths, etc. on, say, for example, a run along a corridor with three different sizes of copper, all with different thicknesses of insulation, and one non-insulated SCH 40 steel pipe for gas - all parallel to each other. To simplify, let’s say all of these pipes are on the same centerline from the floor. Of course, the hangers for the copper would have to be hung at their “temporary” height to allow the copper to rest in the saddle for roughing in, and enough rod must be left over to allow for the hanger to be dropped enough to allow for the future installation of the insulation, but the MATH! What is the math? What is your method? For the example I gave above, I could go through three or more notebook pages, adding, subtracting, scratching-out what I just tried to calculate because I forgot where I was in the calculation, then starting over again. Laying-out and calculating hanger heights and rod lengths seems to be way too time-consuming for me, and I know that you know the answers to change that. If you would like an example of one I just did down a 180’ corridor, start from left to right with these four pipes, all parallel to each other with the same centers from the floor to the pipes: 1-1/4” copper hot return with 1” insulation, 2” hot copper supply with 2” insulation, 3” cold copper supply with 1” insulation, 3” SCH 40 steel gas with no insulation. What do you think, Tom? Is this something you have an easy-to-remember mathematical solution for? Is this something you would be interested in producing a video for?

Is the diagonal the roll???

The best explanation for this is that,. Thank you so much

Hi Tom, I just read your book. In book 2023 version page178, step 2 in all solve conflict with others: 7 x 0.414 = 2.89”the other is 2.98”.

Is the fitting allowance, the rest of the elbow compared to where the pipe actually is in the connection

How would you still do this rolling offset if you used 2- 90 degree elbows on 45 degree angles?

But nobody says that I order to use 45 angle you have to have the distance between the ages of the two pipes same with the center to center measure of the two pipes.

What about the actually roll in the rolling offset? Like how much you need to turn the bottom fitting to make the offset work. No one ever talks about that.

How do you come out with 5.83 from 34?

Why not just use the setback x 1.414 ?

Are you in Texas

CxC =?

Im so lost

Believe on the Lord Jesus Christ and you will be saved

Do it with 90s

🤣 p̳r̳o̳m̳o̳s̳m̳