003 HOW TO: Place Branch Out on Pipe at Certain Degree

This article is going to be short writings only as it is easy as A B C (seriously) though the title quite lengthy. But, hey some may not knowing it yet. So, I guess no harm sharing as my writings have been gone cold these days. Got to do some warm up!

So, here we go!

Have you seen any branch out that been placed at certain degrees like this in fabrication drawing?

Based on the dimensions given, we may used trigonometric ratios formula to define the degree of tilt of the branch out. Just for a refreshing notes, the formula as per below;

Thus, in this case the degree of the tilt is;

tan θ = 167 / 167 ; θ = 45°

However sometimes, the outcome may blown out your brain as this does not looks like placed at correct degree, isn't it? ??♀?

That is quite frustrating as 45 degree is quite easy to achieve actually. What if a drawing specified something odd like 25.5 degree? How do a fitter measure it?

There are quite few methods to do it, as long as it is mathematically correct and the location can be achieved as per what drawing specified. Some preferred to do it by L ruler, some measuring it by tape. What am I about to share today is by measuring the circumference of the pipe. It is quite simple, but rest assured it is accurate, and it will be correct at any degree specified.

First, we know that;

And then, let say we have a drawing that requires olet to be at 25.5 degree like an example below;

As we know one full circumference (C) equal to 360°; then we should divide the C with 360°, to get length for each 1°. This we call X = length/degree.

Thus, for a 25.5°; we multiply the degree specified with X; so, we will get the distance of the olet from the centre top of the pipe. Lets do one example;

Pretty easy, isn't it? If yes, I hope your fitter will not mess it up next time we have tilt branch out like this.

Until next time! All the best and God bless. ????????

#pipingnewb