![]() Until recent years, the infrastructure of CNG (compressed natural gas) fueling stations was non-existent. With the increase in the number of natural gas vehicles on the road, the demand for natural gas fueling stations has grown. One of the best applications for extra-long length stainless tubing is underground high-pressure lines with building natural gas fueling stations. This makes seamless the preferred option for critical applications. When using seamless coil tubing, there is no risk of impurities that are often associated with welding tube. Some are even able to achieve coils that exceed 6,000 feet (2 km) in length without any longitudinal or orbital welds. ![]() There are a limited number of manufacturers capable of producing long lengths of large diameter seamless stainless tubing in coils. ![]() Uncoiling is best accomplished with a special uncoiling or straightening tool. 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. Welding sticks of stainless tubing is also costly due to the labor involved, which includes the requirement of inspection of each weld. When done properly however, a weld is technically more suitable than using a mechanical fitting, but there is still a potential for leaks. With proper installation, mechanical fittings can provide a leak free connection. The conventional method is to weld 20 foot lengths of ‘stick’ tube together. 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”).
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