You’re welcome. One you calculate then you will need to subtract for fitting allowances (I have another video on that). Then you can assemble the pipe.
@plumber-tom9470 What happen though, I have problems assembling the rolling offset. I know from the explanation how to calculate the rolling offset. Do you by chance, have a video showing how to assemble the rolling offset AFTER calculation is done?
I was trying to roll a wye 45 degrees, but I wanted a fitting that picked up a vertical stack at the end, instead of picking up a horizontal run. That appears to require a 30 degree fitting (1/12th bend) which doesn't seem to be a fitting.
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!
You can do a rolling offset with two ninety degree elbows, but the math is different. You would just have to measure the offset between pipes, and subtract fitting allowances.
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?
Hey Bruce. That is a good suggestion. I know exactly what you are dealing with. I did commercial construction work for quite a few years. I will put that on my list of videos to consider. Thanks!
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.
That varies for each scenario. I've found for me the easiest way to find that is to take the two 45s with the length of pipe Tom just taught to find and put them all together. For the rolling offset to work correctly those two 45s need be in line with each other. Usual fittings have marks on them to help find the different 45° angles. I'll look down the one fitting like I would a gun sight to make sure the fittings are in line. Once that is done you can take this pipe assembly and put it on the pipe where you want the offset to start. I'll take a tape measure out and measure the rise. If the math is done correctly this should land the offset right where you want it.
Hello Cody. Perhaps I need to do a follow up video demonstrating the offset. But to answer your question, the fittings in the offset need to be completely aligned in a flat plane. By that I mean, if the offset were laid on a flat surface, all the pipe and fittings would lay down evenly. If the fittings are turned out of square from each other, then the pipes will not go in a parallel direction before and after the offset. Does that make sense?
Take the square root. On a calculator, type in 34 and hit the button that looks like a check mark. This will find the number which, when multiplied by itself, will equal 34. It comes out to be 5.83. Hope this helps.
Good question. Most of the time we are not given the setback or it is difficult to measure. But the offset and the rise are generally measurements we are given or that we can measure for ourselves. From the horizontal offset and the rise we can figure out the true offset which is equal to the setback and then multiply by 1.414 to get the diagonal.
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 does it mean to believe, to simply believe he exists? Is that truly all that Jesus wants? Didn't he want his disciples to follow him? Following means much more than just believing.
Amen. All you have to do is change your mind from not believing THE GOSPEL to believing THE GOSPEL. Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; 2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. 3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; 4 And that he was buried, and that he rose again the third day according to the scriptures: 1 Corinthians 15:1-4 Trust in Jesus Christ and Jesus Christ alone For God so loved the world that He gave His only begotten Son that whosoever believeth in Him should not perish but have everlasting life. Sirs, what must I do to be saved? Believe on the Lord Jesus Christ and thou shaly be saved and thy house. Acts 16:30-31. The wages of sin is death, but the gift of GOD is eternal life through Jesus Christ our Lord. Romans 6:23 For it by grace are ye saved, through faith, not of yourselves, it is the gift of God, not of works lest any man should boast. Ephesians 2:8-10 HE PAID IT ALL WITH HIS PRECIOUS BLOOD! Decipleship comes after salvation, not before.
Thank you so much. Watched so many videos and this one makes the most sense
Awesome! Glad I could help!
Thanks for explaining it and have a great 3d angle so I could actually see the room and the triangles perfect
Glad it helped!
Very Well explained!👍
Thank you for your great explanation. 👍
May you explain as well how to fit up the rolling offset please?
You’re welcome. One you calculate then you will need to subtract for fitting allowances (I have another video on that). Then you can assemble the pipe.
@plumber-tom9470
What happen though, I have problems assembling the rolling offset. I know from the explanation how to calculate the rolling offset.
Do you by chance, have a video showing how to assemble the rolling offset AFTER calculation is done?
Thank you from the battery builders across the oilfield 👍🏻👍🏻👍🏻
Glad to help
From an apprentice Thank you you explained it In a way that clicked with me
Glad to hear it. Keep up the good work!
I was trying to roll a wye 45 degrees, but I wanted a fitting that picked up a vertical stack at the end, instead of picking up a horizontal run. That appears to require a 30 degree fitting (1/12th bend) which doesn't seem to be a fitting.
Oh. When you get into 30 degree fittings there are other constants to use for calculating. 1.414 is only for 45 degree calculations
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!
Thanks Bruce. I appreciate the suggestions. I have a long list of ideas for videos to produce. I will keep that in mind.
Great job !!!
Thanks!!
Is the fitting allowance, the rest of the elbow compared to where the pipe actually is in the connection
No it is not the whole fitting. The fitting allowance is the space inside the fitting from the end of the pipe to the center of the fitting.
The best explanation for this is that,.
Thank you so much
Awesome! Glad this helps!
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”.
apologies. looks like a typing error.
How would you still do this rolling offset if you used 2- 90 degree elbows on 45 degree angles?
You can do a rolling offset with two ninety degree elbows, but the math is different. You would just have to measure the offset between pipes, and subtract fitting allowances.
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?
Hey Bruce. That is a good suggestion. I know exactly what you are dealing with. I did commercial construction work for quite a few years. I will put that on my list of videos to consider. Thanks!
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.
That varies for each scenario. I've found for me the easiest way to find that is to take the two 45s with the length of pipe Tom just taught to find and put them all together. For the rolling offset to work correctly those two 45s need be in line with each other. Usual fittings have marks on them to help find the different 45° angles. I'll look down the one fitting like I would a gun sight to make sure the fittings are in line. Once that is done you can take this pipe assembly and put it on the pipe where you want the offset to start. I'll take a tape measure out and measure the rise. If the math is done correctly this should land the offset right where you want it.
Hello Cody. Perhaps I need to do a follow up video demonstrating the offset. But to answer your question, the fittings in the offset need to be completely aligned in a flat plane. By that I mean, if the offset were laid on a flat surface, all the pipe and fittings would lay down evenly. If the fittings are turned out of square from each other, then the pipes will not go in a parallel direction before and after the offset. Does that make sense?
How do you come out with 5.83 from 34?
Take the square root. On a calculator, type in 34 and hit the button that looks like a check mark. This will find the number which, when multiplied by itself, will equal 34. It comes out to be 5.83. Hope this helps.
Is the diagonal the roll???
Yes. The diagonal is the roll.
Why not just use the setback x 1.414 ?
Good question. Most of the time we are not given the setback or it is difficult to measure. But the offset and the rise are generally measurements we are given or that we can measure for ourselves. From the horizontal offset and the rise we can figure out the true offset which is equal to the setback and then multiply by 1.414 to get the diagonal.
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.
Thanks for watching
Thank you for Morocco
You’re welcome!
Are you in Texas
Utah
CxC =?
"C x C" is a representation of c squared. I could not show a squared sign, so I typed it out as "C x C". But it means "C" multiplied by itself.
Im so lost
You can do this!
@@plumber-tom9470 im from Texas I go test in March
Believe on the Lord Jesus Christ and you will be saved
Agreed 👍
What does it mean to believe, to simply believe he exists? Is that truly all that Jesus wants? Didn't he want his disciples to follow him? Following means much more than just believing.
Amen.
All you have to do is change your mind from not believing THE GOSPEL to believing THE GOSPEL.
Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; 2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. 3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; 4 And that he was buried, and that he rose again the third day according to the scriptures: 1 Corinthians 15:1-4
Trust in Jesus Christ and Jesus Christ alone
For God so loved the world that He gave His only begotten Son that whosoever believeth in Him should not perish but have everlasting life.
Sirs, what must I do to be saved? Believe on the Lord Jesus Christ and thou shaly be saved and thy house. Acts 16:30-31.
The wages of sin is death, but the gift of GOD is eternal life through Jesus Christ our Lord. Romans 6:23
For it by grace are ye saved, through faith, not of yourselves, it is the gift of God, not of works lest any man should boast. Ephesians 2:8-10
HE PAID IT ALL WITH HIS PRECIOUS BLOOD! Decipleship comes after salvation, not before.
Please stop playing the music. It is a distraction from what you are saying.
Noted. Thanks
Do it with 90s
That is possible, but it does not require as much math. Just a measurement from center to center and subtract fitting allowances.
🤣 p̳r̳o̳m̳o̳s̳m̳
Thanks!