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RECOMMENDED CURE SCHEDULE <br /> <br />For optimum physical properties and corrosion resistance, it is recommended <br />that the cured-in-place pipe tube be cured under variable conditions based on the <br />thickness of the liner being installed. <br /> <br />I. Cured-in-place pipe liners 4.5-12.0 mm thick. <br /> <br />• Ramp cure these liners to a temperature of 175ºF (+5 to 7ºF) from top to <br />bottom ends of the liner tube. When temperature is stable from top to <br />bottom end of liner tube, start the hold time of the temperature (hold equal <br />temperature of 175ºF (+5 to 7ºF) top to bottom for a minimum of 3 hours <br />for liner lengths of 300 to 350 foot. For liners greater in length add one <br />hour per 100 foot of liner tube. <br /> <br />Temperature Equilibrium Note: The temperature difference of the water <br />between the upstream and downstream ends of the tube will vary <br />depending on the size of the pipe, the size of the water heater, the condition <br />and size of the circulation hose, and the capacity of the circulation pumps. <br />Therefore, it is very important to monitor the water temperature on both <br />ends to ensure a proper cure is accomplished. <br /> <br />Post Cure Note: If the thermocouples are reading incorrectly, very low <br />(i.e. less than 175ºF), or there is an excessive amount of water running in <br />and around the old pipe, increase the post cure for one additional hour <br />and re-evaluate the thermocouple readings. <br /> <br />• Cool down the water slowly from 185ºF to 100ºF at a rate no faster than <br />30Fº/hr. <br /> <br />II. Cured-in-place pipe liners 13.5-16.5 mm thick. <br /> <br />• Slowly raise temperature of the return water (i.e. column end) to 145ºF <br />(±5ºF) over the course of 1 hour minimum. The downstream water <br />temperature should be 145ºF (±5ºF). <br /> <br />Temperature Equilibrium Note: The temperature difference of the water <br />between the upstream and downstream ends of the tube will vary depending on <br />the size of the pipe, the size of the water heater, the condition and size of the <br />circulation hose, and the capacity of the circulation pumps. Therefore, it is very <br />important to monitor the water temperature on both ends to ensure a proper cure <br />is accomplished. <br /> <br /> <br />