finding out the length of a bend?

[Stu3y]

ok just got my NVQ papers and flicking through it theres a diagram that has to be bent using 15mm copper..

1 of the questions is also what was the total length of the pipe.. so i was wondering how to find out the total length of a pipe if it was already bent, most the measurements are already there apart from the bends..

what would the working out for this be?

i know the 90 degree bend is worked out using 4x the diamiter of pipe = 60mm x2 x3.14 / 4 = 94mm bend lentgh?
what about the offset, how would that be worked out?

sorry if its a daft question, just seen it and wondered if any 1 knew...

 

[mountainman]

Bejesus, they didn't ask this when I was a sprog.
It will have something to do with pi x d but as it's beer o clock after a tough day :beer::beer::beer:

 

[PlumbBobBob]

i think the best thing is for you to try and work it out and then come on here with your answer, rather that asking us to do it for you. do you have any plumbing books you can look through?

 

[Barry98]

i think the best thing is for you to try and work it out and then come on here with your answer, rather that asking us to do it for you. do you have any plumbing books you can look through?

That at mean you don't know neither

 

[kay-jay]

410 mm

 

[SimonG]

How longs a piece of string 🙂

 

[kay-jay]

410 mm cos a 90 degree bend stretches the pipe by the diameter length therefore the pipe length is the lengths of the two axis less 15 mm which was stretched pulling the bend🙂

 

[PlumbBobBob]

That at mean you don't know neither

could be :smile:

 

[Barry98]

could be :smile:

Me neither I'd of just redone it if it didn't fit where it was going

 

[PlumbBobBob]

that's the real world way of doing it

 

[galaxy_plumbing]

[DLMURL]http://www.ciphe.org.uk/Global/Student%20Study%20Section/Copper%20pipework%20bending.pdf[/DLMURL]

 

[Dotty]

[DLMURL]http://www.ciphe.org.uk/Global/Student%20Study%20Section/Copper%20pipework%20bending.pdf[/DLMURL]

Or....

http://www.ukcopperboard.co.uk/literature/pdfs/bending-copper-tube-wallcharts.pdf

 

[stevetheplumber]

what a waste of time the stuff they teach is cheer up kid youl never need this again

 

[Stu3y]

cheers for the links, i will have a read..

ive bought a book made by Heinemann - plumbing 3rd edition for NVQ level 2 so will have a good read of it all, the book dosent seem to have a great deal on bending though!

 

[tamz]

what a waste of time the stuff they teach is cheer up kid youl never need this again

I was just thinking this Steve. What a load of pysh.
No one in the real world would sit and work that rubbish out and certainly not work it out, cut the pipe to length then bend it.
It is a stupid paper exercise thought up by those who don't do the work for a living.
In the real world you take a length of pipe mark and bend it then cut the last tail to size.

Btw you would need the angle of the offset to work it out accurately.

 

[kirkgas]

Tam you are right as always, pipe bending is one of the things I'm always getting a dig for in the colleges by SOME NOT ALL of the lecturers, I teach apprentices how to bend nice, near accurate double bends to go round things with minimum waste of pipe and waste of time, then someone else takes them, looks at the cracking work they can do but marks them down cause they can't explain the theory long hand ( bovine excrement to me ) way to do it, it's all about power plays by some lecturers who have spent way too long in college, some are brilliant at dressing lead models as they have been showing the same models to students for 20 yrs, and fair okay they are better than me at it but they can't do any changes etc
Show the guts and gals how to do it quickly and properly to be an asset to their company is my motto
Half the time I measure an offset then just bend it, no faffing about and it fits

 

[justlead1]

Hi. String or a bit of wire along the centre line of full scale drawing gives the answer. (Just pull it straight and measure it)