Pipe bending rules?

[double d]

Hi can any one help
ive just started my plumbing course with OLCI and im on unit 3 'Pipe Bnding' and confused with the formula that is used to decide the centre line of the radius of the bend, i know its stairing me in the face but cant get my head around it lol, ive been working as a basic builder/plumber for 9 years now fiiting disabled showers and doing basic plumbing and ive allways measured a bit of pipe bent it useing machine and my eyes lol all of this ' Radius and Formula ' stuuf is stumping me
i know its a stupid question but would be very greatfull if any one could take me through it step by step, cheers.

 

[Dan]

Welcome to Plumbing Forum | Plumbing Advice | Plumbers Forums | A forum for plumbers advice in the UK!

Hello double d, welcome aboard www.UKPlumbersForums.co.uk. Stick around, I'm sure you'll like the place.

 

[johnmcginty]

Hi can any one help
ive just started my plumbing course with OLCI and im on unit 3 'Pipe Bnding' and confused with the formula that is used to decide the centre line of the radius of the bend, i know its stairing me in the face but cant get my head around it lol, ive been working as a basic builder/plumber for 9 years now fiiting disabled showers and doing basic plumbing and ive allways measured a bit of pipe bent it useing machine and my eyes lol all of this ' Radius and Formula ' stuuf is stumping me
i know its a stupid question but would be very greatfull if any one could take me through it step by step, cheers.

the formula is in the nvq2 book

 

[double d]

Thanks for the reply

ye got the book, so the formula answer is 94mm useing 15mm pipe, does that mean every time i bend 15 mm i get the same answer, sorry for the stupid response but, trying to get out of old habbits of picking up pipe, looking at it, bending it, job done lol, want t mak ure i understand the correct way, to use on the course

 

[johnmcginty]

Depends on the angle ? and former radius.

 

[migoplumber]

depends if your asking the question to pass exam, or improve your current technique!
in the real world, i'd be over the moon if a couple of bend went wrong and had to nip 30mm off the end - to throw in my bucket!!
i now in college you lose a point for every 1mm your bend is out - that rule just dosn't hold true in the real world.
welcome to forum

 

[WHPES]

On my course (Engineering rather than plumbing) the formula for the length of pipe is a + b minus (y/360)x2xpixr where a and b are the straight lengths to where the lines would intersect, y is the angle of the bend and r is the radius of the former (to the centre line of the formed pipe).