Me too but I made a shallow V-section instead of a flat. Only time I've had my SIP 130T up to almost full power (tried it up full but kept tripping the 16A breaker in the garage)We used a Machine Mart pipe kinker and found that if you put pieces of flat metal in front of the two rollers that it pushed the pipe against it helped spread the load and relieved some of the kinking.
Maybe this will help..
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.
Thin wall tube needs a mandrel bender, very expensive equipment. We used a Machine Mart pipe kinker and found that if you put pieces of flat metal in front of the two rollers that it pushed the pipe against it helped spread the load and relieved some of the kinking. Tube and pipe are two different things but you can get away with a bit if you pack round it in the former to make it a better fit.
Maybe this will help..
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.