Pipe bending

[extremed]

Would a Clarke type 12 ton pipe bender manage 3mm wall 48mm pipe or is it called tube or even round hollow section?thanks

 

[extremed]

48 is the outside measurement

 

[blenkie1]

It will flatten the outside of it. Need a tube bender for something like 3mm. They are ok for doing thicker walled pipe. Heard people filling them with sand and bending them.

 

[addjunkie]

You might beable to pack the pipe die with sheet ali to fit the od of the tube, many do. But better off with a tube bender

 

[balmerchris]

It depends how much of a bend you want to do and on the quality of the pipe. I use a similar bender at work and it is just about acceptable most of the time but for bends over 90 degrees its useless. I use a lot of the pipe you are asking about and sometimes there will be a soft bit in the pipe which will not bend at all just kink. On regular bits of pipe with close to 90 degree bends, it usually just has a slight flat on the outside of the bend and some slight wrinkles on the inside.

What is the difference between a pipe bender and a tube bender?

 

[balmerchris]

is the tube bender you guys are talking about the same as a rotary draw bender?

 

[addjunkie]

Yes, but also the pipe dies are not supporting the center line radius of the tube. With a tube bender, even my conduit bender the dies are deeper giving the tube side more support when being bent.

I actually made a die for a clarke bender to bend tube, works a treat.

 

[extremed]

So what's the difference between pipe and tube?

 

[Gareth0123]

So what's the difference between pipe and tube?

About £1 per metre

 

[addjunkie]

Nothing they are both a cylindrical continuous pice of metal.

Pipe is to carry fluids, and is quoted by its internal diameter for example 1 inch (upto 10 inch if memory serves me correctly) then the schedule ie what pressure rating. Thegher the schedule the greater pressure its rated for, therefore greater wall thickness.

Tube is for stuctural strength quoted in external diameter then gauge for wall thickness. Then there are different heattreatmments the tube goes through. For a motocyvle frame for example youd want Cfs3 NBK....cold formed steel normalised black. Hydraulic tube is annealed but may still be quoted as cfs but as its annealed would bend easily then work harden

 

[Robotstar5]

So what's the difference between pipe and tube?

PIPE SPECIFICATIONS

1.All pipe is to be made of a hole, surrounded by metal or plastic centered around the hole.
2.All pipe is to be hollow throughout the entire length-do not use holes of different length than the pipe.
3.The I.D.( Inside Diameter)of all pipe must not exceed the O.D.(Outside Diameter)-otherwise the hole will be on the outside.
4.All pipe is to be supplied with nothing in the hole,so that water, steam or other stuff can be put inside at a later date.
5.All pipe should be supplied without rust; this can be more readily supplied at the job site. NOTE; Some vendors are now able to supply pre-rusted pipes. If available in your area, this product is the recommended thing, as it will save a great deal of time at the job site.
6.All pipe over 500 ft( 150m) in length should have the words " LONG PIPE " clearly painted on each side and end, so the contractor will know its a long pipe.
7.Pipe over 2 mile ( 3.2 KM) in length must also have the words " LONG PIPE " painted in the middle so the contractor will not have to walk the entire length of the pipe to determine whether or not it is a long pipe or a short pipe.
8.All pipe over 6ft ( 1.83m) in diameter must have the words " LARGE PIPE " painted on it, so the contractor will not mistake it for a small pipe.
9.Flanges must be used on all pipe. Flanges must have holes for bolts, quite separate from the big hole in the middle.
10.When ordering 90 degree or 30 degree elbows, be sure to specify left-hand or right-hand. otherwise you will end up going the wrong way.
11.Be sure to specify to your vendor whether you want level, uphill or downhill pipe. If you use downhill pipes for going uphill, the water will flow the wrong way.

 

[balmerchris]

Yes, but also the pipe dies are not supporting the center line radius of the tube. With a tube bender, even my conduit bender the dies are deeper giving the tube side more support when being bent.

I actually made a die for a clarke bender to bend tube, works a treat.

Thats a nice bit of work. Did you make on a mill? does it split into two halves?

 

[addjunkie]

Thats a nice bit of work. Did you make on a mill? does it split into two halves?

If you click on the picture it takes you into my photobucket thing, there is a series of pictures of it being made, a combination of lathe and mill

 

[DAPPH]

I've recently put some slight angles on some 44 mm OD stainless steel tube that has a 2 mm wall to modify a pond cleaner venturi device that fits on the end of my powe rwasher . I looked at several ways of bending it & how to have the tube supported so it would not rupture or fold ( There was a thread about it started by me , sometime just before Christmas if I remember correctly )

I went with plugging one end with a plug turned up on my lathe leaving a fair sized lump out of the tube to facilitate removal later on . Then using melted poured in bitumen filled the tube to the top . Thankfully by accident rather than design I'd cut a longer piece off the 2 mtr length than I first thought I'd need for as the bitumen cooled it shrank down the tube some three inches or so .
I left it over night and then put it in the chest freezer for 24 hrs to set it supposedly rock solid . Set the 12 hydraulic ram bender up withe the right radial form and gently started to try and put in a 15 % bend at either end one at 120 degrees to the first so I got a sort of twisted dogs leg situation . At both bends the pipe wrinkled a bit either side , ust out of the point of contact with the form on the underside , fortunately it was enough & didn't cause problems for this non critical job .

Should I have to bend the same pipe again I will be mixing 2 hands of dry sharp sand into one handful of broken cold bitumen and then melt it & stir it in the sand the melting pan The ice cold minus 23 o C solid bitumen had in fact actually compressed & that's what caused the partial collapse /wrinkle .

Once the pipe was to my liking I used a blow lamp to melt the bitumen out the tube , eventually a big black slug about a foot long slithered out and curled round the pan . This enabled me to put the blow lamp flame right through the tube and carbonize most of the remaining bitumen so I could then remove it with my 1500 psi power washer. I then used a super thin stainless steel cutting blade on the four inch angle grinder to cut the tube to the right length .

One last thing .. The use of the melted bitumen was far cheaper than my original thought of using molten lead as the tube filler , plus it was a dam sight lighter .

 

[Member 66061]

My dad tried to bend some scaffold pole...ish size pipe for a large frame he was wanting to build. He wasnt having any success and kept creasing and flattening it, I told him to fill it with sand. We went and got some fine, dry sand from a dune at the beach, filled the pipe, bunged the end and the job was a good 'un.
It bent well to 90 degrees, 4 bends to form a large rectangle and then we just tipped the sand out.

 

[winchman]

Would a Clarke type 12 ton pipe bender manage 3mm wall 48mm pipe or is it called tube or even round hollow section?thanks

Just such an item is in the sales section should you still need one?

 

[DAPPH]

My dad tried to bend some scaffold pole...ish size pipe for a large frame he was wanting to build. He wasnt having any success and kept creasing and flattening it, I told him to fill it with sand. We went and got some fine, dry sand from a dune at the beach, filled the pipe, bunged the end and the job was a good 'un.
It bent well to 90 degrees, 4 bends to form a large rectangle and then we just tipped the sand out.

Hi ,
Did you have to vibrate the sand down to get rid of excess air ?
Did you have to pour watter in he tube before putting the other bung in ,so as to get it a bit solider ?
or
Was it simply a single bung at one end and the tube was filled with the dry sand ?

 

[Member 66061]

Hi ,
Did you have to vibrate the sand down to get rid of excess air ?
Did you have to pour watter in he tube before putting the other bung in ,so as to get it a bit solider ?
or
Was it simply a single bung at one end and the tube was filled with the dry sand ?

We put a wooden bung in an end, i climbed up on the shed roof with a piece of rolled up cardboard and a bucket of dry, fine sand from a sand dune, the pipe end was passed up and i poured the sand down the pipe til there was just enough gap left to hammer a bung in the end. It was a long length of pipe, the rectangle we made was about 11' x 6', we made 2 of them. We used a Clarke pipe bender. The results were the same as a manufactured bend on a frame he was trying to replicate. Once the pipe was bent the bungs were removed and we just repeatedly turned the frame letting the sand pour out. The trick was it had to be fine, dry sand or it wouldnt have poured in and back out, and getting the end of the pipe nice and high to pour the sand in, we tried at a shallower angle but with no success.