Proven methods with engineering techniques for producing optimized lined pipe work, best suited for reducing permeation

• Fine powders of approved grades are first conditioned to the desired temperature
• Tubes are extruded to a size somewhat larger than the I.D. of steel housing. Extrusion dies are designed to ensure a higher wall thickness than that specified in the ASTM
• Extruded tubes are sintered using a programmed sinter cycle. In this process, the heating and cooling cycle is precisely controlled and monitored to ensure that the entire tube achieves a high molecular crystallinity with low void content which helps in reducing permeation and allows the pipe work to work for an extended time period
• Sintered PTFE tubes are first "roll tested" and then subjected to a series of quality checks which are carried out in our Laboratory to ensure liner integrity and compliance to ASTM specifications
• The liner is then drawn through sizing dies at controlled draw rates which results in a calculated reduction in the liner diameter. This drawn liner is inserted into the metal pipe
• In the relaxation process which follows, the liner is allowed to relax inside the pipe housing, resulting in a snug liner fit, a procedure adhered and maintained to eliminate undesirable stress in the finished product
• The two ends of projected liners are then hot flared so as to form a gasket over the flange face using controlled temperature, time and pressure
• Finished pipes are then tested as per the testing requirements specified in the ASTM F 1545
• This unique method of lining pipes is known as the Thermalok^® process which was then patented by Resistoflex. This process ensures that the steel pipe and liner act as one integral piece
• The final product - an "optimized lined piping system" - the full strength of the metallic pipe and the corrosion resistance of the liner
• The Thermalok^® process provides dimensional stability to the lined pipe under vacuum, pressure, and thermal cyclic conditions, and also prevents the liner from buckling and/or the flares to get cut off.