There are many factors to take into account when running long lengths of high pressure stainless steel tubing, especially larger diameters (1/2” to 1”). The conventional method is to weld 20 foot lengths of ‘stick’ tube together. With proper installation, mechanical fittings can provide a leak free connection. When done properly however, a weld is technically more suitable than using a mechanical fitting, but there is still a potential for leaks. Welding sticks of stainless tubing is also costly due to the labor involved, which includes the requirement of inspection of each weld.
With advances in heat treat technology, coils of large diameter seamless stainless tube can be specially annealed to allow for enough malleability to safely coil the tubing during manufacturing, and permit safe uncoiling in the field. Uncoiling is best accomplished with a special uncoiling or straightening tool.