Been eyeballing those for years. Works everytime:)

@BGsPlumbingClass

3 күн бұрын

In many cases, an "eyeball estimation" is acceptible. When running offsets of longer than 4' in an exposed area, using a less forgiving material such as cast iron, a minute of time on a scratch piece of paper or a construction calc app on the phone will save material, time, and inaccurate installation.

Thats the long way but a good way to explain. 1.414 for 45 fitting allowances 22 fittings are 2.613

@BGsPlumbingClass

3 жыл бұрын

That is true for the 1/16th bend (22 1/2) offset. The run is 2.414 if you needed to calculated that as well. Great addition!!!

I remember learning the Pythagorean theorem and sine, tan, and cosine and all that and the entire class would always ask why we needed to know this stuff....and not a single math teacher showed us this.

@BGsPlumbingClass

2 жыл бұрын

I know! I wish the teachers would wake up and try to explain things better. I love math and I've had a few requests to go over some plumbing math. I'll get there soon for everyone.

@user-ug6ti3op3x

4 ай бұрын

Commonly known as over teaching . Simplicity is over rated when a teacher is a teacher and not into mechanical trades in reality . Everything on a piece of paper is logical. Put them in the field where the world is not a static product like a book teaching class. Teaching is one thing but the logic of practicality not taught that would not be applicable for a career job security in the education industry .

@BGsPlumbingClass

4 ай бұрын

Agreed!

Nice, easy and straight forward explanation

@BGsPlumbingClass

2 жыл бұрын

Thanks Sam!

Yes, but you have to take off for the fitting depths. So if you're using two 45's you'll measure the hub length, multiply by 2 and subtract your run ("C") by it.

@BGsPlumbingClass

10 ай бұрын

That is true, great observation! This video was only designed to show HOW the constant 1.414 is figured. You are correct in the statement about subtracting the fitting make ups, but you take it away from the travel (C), not the run (B)- which is identical to the offset (A) in a 45 degree offset situation. Also, keep in mind that if you are using a wye and a 45, the take offs are going to be different.

Small world, I worked with Doug Kirk on water conservation a few yrs ago.

@BGsPlumbingClass

2 жыл бұрын

He is a great asset to the industry. He has just retired.

Well you find the travel for the 45 degree offset, do you subtract 2*45 angles? I refer to steel pipes and angles

@BGsPlumbingClass

Жыл бұрын

If I understand the question correctly, I think it may help in explaining it a different way. In an offset of piping, if I were to use 45 degree fittings, the run and the offset are of equal distance (this is a mathematical constant and if the angles shift off 45 degrees, the run is longer if the fittings are less than 45 and the offset is longer if fittings are more than 45 degrees). To find the travel for 1/16th bends (22.5 deg), multiply the offset by 2.612 and to find the run multiply the offset by 2.414 To find the travel of 1/6th bends (60 deg), multiply the offset by 1.156 and to find the run multiply the offset by .575

@angrynas9668

Жыл бұрын

@@BGsPlumbingClass Your answer is great sir, but what I mean is that the outcome for the travel measurement refers to clear pipe edges, so we take out (subtract) 2 angles(60,45 or 22,5 what ever we deside to use). In every video I see they take out 2 half's and measure the travel from half to half the two angles plus the travel piece.

@BGsPlumbingClass

4 ай бұрын

I'm guessing that would be more for a fitted pipe scenario?

I dreamed about this number one day , and recalled i used it on college classes long ago but dont know why i dreamed about it. Funny how our brain holds on data longer than we can imagine.

@BGsPlumbingClass

7 ай бұрын

The cool thing is there are constants for each angle of travel we use.

What is the run is greater than the offset ? Then it's no longer there same.

@BGsPlumbingClass

5 ай бұрын

That is true. But it's also no longer a 45 degree offset. As plumbers, we tend to deal in 45 or 22.5 degree offsets, if they're not 90s.

Who thought that up?

@BGsPlumbingClass

3 жыл бұрын

When I first started teaching 20 years ago, a student asked me where that number came from, and I told him I'd figure it out for him. Obviously someone else had figured it out way before me but I didn't have the internet to guide me, so I actually figured it out myself and was totally excited to share. The next semester the textbook issued a new edition and son of a gun if it wasn't in there!!! Stole my thunder so to speak.

@plumbguru

3 жыл бұрын

Ben, This is Doug Kirk.......I'm sure you remember being in my class for the Spring 94-95 semester. I supplied the class with what I titled a MORE FORMULAS sheet....ring a bell? You're doing a pretty good job with these classes

@BGsPlumbingClass

3 жыл бұрын

@@plumbguru Doug, It is an honor to have been one of your students! Thank you for the kind words. I can only hope to learn half of what you have forgotten over the years. I believe I still have that from your class as well as some of your handouts and notes that you have left behind. As you know the campus was demolished a few years ago and I was tasked with removing and "throwing away" what was not needed. I kept your notes and papers so that I may be able to go through them (hope you don't mind). I even found a couple certificates for other students that I was able to locate and hand over to them! Thank you Mr. Kirk for all you have taught me and for - above all- showing me how to be a better instructor.

Look at other math vids, with a 45 45 90, A and B are both 10, they'll say C is square root of 10. Nah dude its 14.142. Just multiply any side by 14.142 for the awnser. The square root of 10 is 3.16, that is not the length of C. Made no sense to me.

@BGsPlumbingClass

5 ай бұрын

Hope this one helped a bit better.

30 degree

@BGsPlumbingClass

3 жыл бұрын

Would you like the constants for 30 degrees?

@BGsPlumbingClass

3 жыл бұрын

In case you were asking what the constant was for a 30 degree offset, it is twice the offset. The run is a bit different however. It is approximately 1.155 times the run.

@felipeaquino1636

2 жыл бұрын

30 graus contante é 2.000

You don't have to use any of that. Don't need to determine what the square root is. All you need to know is your C-C measurement, X 1.414 and thats your travel. Take off your fitting allowance for the 2 45s and thats your cut piece. The rest of his method works but takes longer then needed. Simplify shit, understand shit and you'll get good.

@BGsPlumbingClass

6 ай бұрын

I completely agree with you! The whole point of this was to EXPLAIN where 1.414 came from. That's all. I appreciate you watching the video, just a reminder that this was done entirely to show origin. Great assessment, and again, thank you for watching!

I did not like the video, I found it more complicated than it is. Also you didn't mention subtracting the fitting then adding hub depth.

@BGsPlumbingClass

2 жыл бұрын

I didn't mention subtracting fittings as it was only a video to demonstrate where 1.414 came from. I've had several students over the years ask the origin of 1.414 so this is- albeit "more complicated than it is" as you said- the explanation. I do appreciate your honest assessment

What if A not equal B?

@BGsPlumbingClass

Жыл бұрын

If A is not B then the angle of travel is not a true 45 degrees. That would then fall into dealing with Sine, Co-sine, and Tangent equations. Not to mention, short of pipe fitting and creating your own fittings, that is not typical. The only other fittings available would be 22.5 degrees, 60 degrees for waste and vent.